[{"data":1,"prerenderedAt":9394},["ShallowReactive",2],{"lesson:\u002Fnatural-language-processing\u002Ffoundations\u002Fregex-and-text-normalization":3,"course-wordcounts":3649,"ref-card-index":4561,"nav:natural-language-processing":9247,"tikz:9341cb28366ed242c0331bb49a6d42a025082b2ddda7e873caa3a51714e89d96":9391,"tikz:a3acb08b8181f15c7e8de609d1d2dd38aa356c616cfb5a1a28ee1573eb6cc21a":9392,"tikz:07c84ab20b48f1a5ab48789e3f312d72cfe82404c236942fd04dc80ff150ec3d":9393},{"id":4,"title":5,"blurb":6,"body":7,"brief":3621,"category":3622,"description":3623,"draft":3624,"extension":3625,"meta":3626,"module":3628,"navigation":3629,"path":3630,"practice":3631,"rawbody":3632,"readingTime":3633,"seo":3638,"sources":3639,"status":3644,"stem":3645,"summary":3646,"topics":3647,"__hash__":3648},"course\u002F09.natural-language-processing\u002F01.foundations\u002F02.regex-and-text-normalization.md","Regular Expressions and Text Normalization","",{"type":8,"value":9,"toc":3606},"minimark",[10,27,51,56,279,301,306,360,494,538,542,565,1343,1439,1464,1468,1520,1586,1627,1630,1699,1740,1744,1782,1853,2106,2155,2159,2186,2190,2239,2430,2445,2449,2493,2631,2694,2744,2747,2758,2839,2842,2846,2886,2950,2970,3035,3065,3069,3085,3088,3320,3429,3438,3442,3464,3602],[11,12,13,14,18,19,22,23,26],"p",{},"Every language-processing system takes the same input: a stream of characters. Few\ndownstream operations are defined on characters — they need words, sentences, prices,\nor a distance between two strings. This lesson supplies three layers between the\ncharacter stream and the first model: a pattern language for ",[15,16,17],"em",{},"finding"," structure\n(regular expressions), a set of tasks for ",[15,20,21],{},"imposing"," structure (text normalization),\nand one algorithm for ",[15,24,25],{},"comparing"," strings (minimum edit distance).",[11,28,29,30,34,35,38,39,50],{},"Weizenbaum's ELIZA, the earliest dialogue system, was a cascade of\npattern-and-substitute rules — mapping ",[31,32,33],"q",{},"I need X"," to ",[31,36,37],{},"What would it mean to you if you got X?"," — and nothing more.",[40,41,42],"sup",{},[43,44,49],"a",{"href":45,"ariaDescribedBy":46,"dataFootnoteRef":6,"id":48},"#user-content-fn-jm-eliza",[47],"footnote-label","user-content-fnref-jm-eliza","1"," The pattern-matching layer persists in modern\nsystems as the entry point where text enters the pipeline.",[52,53,55],"h2",{"id":54},"regular-expressions","Regular expressions",[11,57,58,59,63,64,67,68,171,172,188,189,197,198,201,202,205,206,224,225,269,270,274,275,278],{},"A ",[60,61,62],"strong",{},"regular expression"," (RE) is an algebraic notation characterizing a set of\nstrings — a ",[60,65,66],{},"regular language"," ",[69,70,73],"span",{"className":71},[72],"katex",[69,74,78,121],{"className":75,"ariaHidden":77},[76],"katex-html","true",[69,79,82,87,93,98,103,108,113,118],{"className":80},[81],"base",[69,83],{"className":84,"style":86},[85],"strut","height:1em;vertical-align:-0.25em;",[69,88,92],{"className":89},[90,91],"mord","mathnormal","L",[69,94,97],{"className":95},[96],"mopen","(",[69,99,102],{"className":100,"style":101},[90,91],"margin-right:0.0278em;","r",[69,104,107],{"className":105},[106],"mclose",")",[69,109],{"className":110,"style":112},[111],"mspace","margin-right:0.2778em;",[69,114,117],{"className":115},[116],"mrel","⊆",[69,119],{"className":120,"style":112},[111],[69,122,124,128],{"className":123},[81],[69,125],{"className":126,"style":127},[85],"height:0.6887em;",[69,129,131,135],{"className":130},[90],[69,132,134],{"className":133},[90],"Σ",[69,136,139],{"className":137},[138],"msupsub",[69,140,143],{"className":141},[142],"vlist-t",[69,144,147],{"className":145},[146],"vlist-r",[69,148,151],{"className":149,"style":127},[150],"vlist",[69,152,154,159],{"style":153},"top:-3.063em;margin-right:0.05em;",[69,155],{"className":156,"style":158},[157],"pstrut","height:2.7em;",[69,160,166],{"className":161},[162,163,164,165],"sizing","reset-size6","size3","mtight",[69,167,170],{"className":168},[169,165],"mbin","∗"," over an alphabet\n",[69,173,175],{"className":174},[72],[69,176,178],{"className":177,"ariaHidden":77},[76],[69,179,181,185],{"className":180},[81],[69,182],{"className":183,"style":184},[85],"height:0.6833em;",[69,186,134],{"className":187},[90],".",[40,190,191],{},[43,192,196],{"href":193,"ariaDescribedBy":194,"dataFootnoteRef":6,"id":195},"#user-content-fn-jm-re",[47],"user-content-fnref-jm-re","2"," Given a ",[60,199,200],{},"pattern"," and a ",[60,203,204],{},"corpus"," of text, an engine returns\nevery substring ",[69,207,209],{"className":208},[72],[69,210,212],{"className":211,"ariaHidden":77},[76],[69,213,215,219],{"className":214},[81],[69,216],{"className":217,"style":218},[85],"height:0.4306em;",[69,220,223],{"className":221,"style":222},[90,91],"margin-right:0.0269em;","w"," with ",[69,226,228],{"className":227},[72],[69,229,231,251],{"className":230,"ariaHidden":77},[76],[69,232,234,238,241,244,248],{"className":233},[81],[69,235],{"className":236,"style":237},[85],"height:0.5782em;vertical-align:-0.0391em;",[69,239,223],{"className":240,"style":222},[90,91],[69,242],{"className":243,"style":112},[111],[69,245,247],{"className":246},[116],"∈",[69,249],{"className":250,"style":112},[111],[69,252,254,257,260,263,266],{"className":253},[81],[69,255],{"className":256,"style":86},[85],[69,258,92],{"className":259},[90,91],[69,261,97],{"className":262},[96],[69,264,102],{"className":265,"style":101},[90,91],[69,267,107],{"className":268},[106],". Every RE compiles to an equivalent\nfinite-state automaton, which is why matching runs in time linear in the input. The\nnotation is portable across ",[271,272,273],"code",{},"grep",", editors, and Python; patterns are written between\nslash delimiters, ",[271,276,277],{},"\u002Flike this\u002F"," (the slashes are not part of the pattern).",[11,280,281,282,285,286,289,290,293,294,296,297,300],{},"The simplest pattern is a literal sequence of characters: ",[271,283,284],{},"\u002Fwoodchuck\u002F"," matches the\nstring ",[271,287,288],{},"woodchuck"," wherever it appears. Regular expressions are ",[60,291,292],{},"case sensitive",",\nso ",[271,295,284],{}," will not match ",[271,298,299],{},"Woodchuck",". Everything past literals is built from\na small set of operators that let one pattern stand for many strings.",[302,303,305],"h3",{"id":304},"character-classes-ranges-and-negation","Character classes, ranges, and negation",[11,307,308,309,312,313,316,317,319,320,323,324,327,328,331,332,335,336,339,340,343,344,347,348,351,352,355,356,359],{},"Square brackets specify a ",[60,310,311],{},"disjunction of characters"," — a single position that may\nbe any one of a set. ",[271,314,315],{},"\u002F[wW]\u002F"," matches ",[271,318,223],{}," or ",[271,321,322],{},"W",", so ",[271,325,326],{},"\u002F[wW]oodchuck\u002F"," catches both\ncapitalizations. Inside brackets a dash denotes a ",[60,329,330],{},"range"," over the character\nordering: ",[271,333,334],{},"\u002F[a-z]\u002F"," is any lowercase letter, ",[271,337,338],{},"\u002F[A-Z]\u002F"," any uppercase letter,\n",[271,341,342],{},"\u002F[0-9]\u002F"," any single digit. A caret as the ",[15,345,346],{},"first"," character inside the brackets\n",[60,349,350],{},"negates"," the class: ",[271,353,354],{},"\u002F[^a-z]\u002F"," matches any single character that is ",[15,357,358],{},"not"," a\nlowercase letter. (A caret anywhere else inside brackets is just a literal caret.)",[361,362,363,379],"table",{},[364,365,366],"thead",{},[367,368,369,373,376],"tr",{},[370,371,372],"th",{},"Pattern",[370,374,375],{},"Matches",[370,377,378],{},"Example",[380,381,382,400,425,439,454,471],"tbody",{},[367,383,384,389,395],{},[385,386,387],"td",{},[271,388,315],{},[385,390,391,319,393],{},[271,392,223],{},[271,394,322],{},[385,396,397,399],{},[60,398,322],{},"oodchuck",[367,401,402,407,419],{},[385,403,404],{},[271,405,406],{},"\u002F[abc]\u002F",[385,408,409,410,412,413,412,416],{},"one of ",[271,411,43],{},", ",[271,414,415],{},"b",[271,417,418],{},"c",[385,420,421,422,424],{},"in uomini, in sold",[60,423,43],{},"ti",[367,426,427,431,434],{},[385,428,429],{},[271,430,342],{},[385,432,433],{},"a single digit",[385,435,436,437],{},"Chapter ",[60,438,49],{},[367,440,441,445,448],{},[385,442,443],{},[271,444,338],{},[385,446,447],{},"an uppercase letter",[385,449,450,453],{},[60,451,452],{},"D","renched Blossoms",[367,455,456,461,464],{},[385,457,458],{},[271,459,460],{},"\u002F[^A-Z]\u002F",[385,462,463],{},"any non-uppercase char",[385,465,466,467,470],{},"O",[60,468,469],{},"y","fn pripetchik",[367,472,473,478,488],{},[385,474,475],{},[271,476,477],{},"\u002F[^Ss]\u002F",[385,479,480,481,484,485],{},"neither ",[271,482,483],{},"S"," nor ",[271,486,487],{},"s",[385,489,490,493],{},[60,491,492],{},"I"," have no reason",[11,495,496,497,500,501,504,505,412,508,511,512,412,515,518,519,412,522,412,525,528,529,412,532,412,535,188],{},"Because a handful of classes come up constantly, there are backslash ",[60,498,499],{},"aliases",":\n",[271,502,503],{},"\\d"," is ",[271,506,507],{},"[0-9]",[271,509,510],{},"\\w"," is a word character ",[271,513,514],{},"[a-zA-Z0-9_]",[271,516,517],{},"\\s"," is whitespace, and\neach has an uppercase-negated twin (",[271,520,521],{},"\\D",[271,523,524],{},"\\W",[271,526,527],{},"\\S","). To match a character that is\nitself an operator — a literal period, star, or bracket — precede it with a\nbackslash: ",[271,530,531],{},"\u002F\\.\u002F",[271,533,534],{},"\u002F\\*\u002F",[271,536,537],{},"\u002F\\[\u002F",[302,539,541],{"id":540},"counters-optionality-kleene-star-and-plus","Counters — optionality, Kleene star and plus",[11,543,58,544,547,548,564],{},[60,545,546],{},"counter"," following an element sets its multiplicity. For an element ",[69,549,551],{"className":550},[72],[69,552,554],{"className":553,"ariaHidden":77},[76],[69,555,557,560],{"className":556},[81],[69,558],{"className":559,"style":218},[85],[69,561,563],{"className":562},[90,91],"e",", the\ncounters denote:",[361,566,567,595],{},[364,568,569],{},[367,570,571,574,592],{},[370,572,573],{},"Counter",[370,575,576,577],{},"Repetitions of ",[69,578,580],{"className":579},[72],[69,581,583],{"className":582,"ariaHidden":77},[76],[69,584,586,589],{"className":585},[81],[69,587],{"className":588,"style":218},[85],[69,590,563],{"className":591},[90,91],[370,593,594],{},"Language",[380,596,597,693,838,967,1044,1212],{},[367,598,599,604,638],{},[385,600,601],{},[271,602,603],{},"e?",[385,605,606,319,623],{},[69,607,609],{"className":608},[72],[69,610,612],{"className":611,"ariaHidden":77},[76],[69,613,615,619],{"className":614},[81],[69,616],{"className":617,"style":618},[85],"height:0.6444em;",[69,620,622],{"className":621},[90],"0",[69,624,626],{"className":625},[72],[69,627,629],{"className":628,"ariaHidden":77},[76],[69,630,632,635],{"className":631},[81],[69,633],{"className":634,"style":618},[85],[69,636,49],{"className":637},[90],[385,639,640],{},[69,641,643],{"className":642},[72],[69,644,646,675],{"className":645,"ariaHidden":77},[76],[69,647,649,652,656,660,664,668,672],{"className":648},[81],[69,650],{"className":651,"style":86},[85],[69,653,655],{"className":654},[96],"{",[69,657,659],{"className":658},[90,91],"ε",[69,661,663],{"className":662},[106],"}",[69,665],{"className":666,"style":667},[111],"margin-right:0.2222em;",[69,669,671],{"className":670},[169],"∪",[69,673],{"className":674,"style":667},[111],[69,676,678,681,684,687,690],{"className":677},[81],[69,679],{"className":680,"style":86},[85],[69,682,92],{"className":683},[90,91],[69,685,97],{"className":686},[96],[69,688,563],{"className":689},[90,91],[69,691,107],{"className":692},[106],[367,694,695,700,718],{},[385,696,697],{},[271,698,699],{},"e*",[385,701,702,717],{},[69,703,705],{"className":704},[72],[69,706,708],{"className":707,"ariaHidden":77},[76],[69,709,711,714],{"className":710},[81],[69,712],{"className":713,"style":618},[85],[69,715,622],{"className":716},[90]," or more (Kleene star)",[385,719,720],{},[69,721,723],{"className":722},[72],[69,724,726],{"className":725,"ariaHidden":77},[76],[69,727,729,733,795,799,802,805,808],{"className":728},[81],[69,730],{"className":731,"style":732},[85],"height:1.1449em;vertical-align:-0.3949em;",[69,734,737,744],{"className":735},[736],"mop",[69,738,743],{"className":739,"style":742},[736,740,741],"op-symbol","small-op","position:relative;top:0em;","⋃",[69,745,747],{"className":746},[138],[69,748,751,786],{"className":749},[142,750],"vlist-t2",[69,752,754,781],{"className":753},[146],[69,755,758],{"className":756,"style":757},[150],"height:0.1514em;",[69,759,761,764],{"style":760},"top:-2.4003em;margin-left:0em;margin-right:0.05em;",[69,762],{"className":763,"style":158},[157],[69,765,767],{"className":766},[162,163,164,165],[69,768,770,774,778],{"className":769},[90,165],[69,771,773],{"className":772},[90,91,165],"n",[69,775,777],{"className":776},[116,165],"≥",[69,779,622],{"className":780},[90,165],[69,782,785],{"className":783},[784],"vlist-s","​",[69,787,789],{"className":788},[146],[69,790,793],{"className":791,"style":792},[150],"height:0.3949em;",[69,794],{},[69,796],{"className":797,"style":798},[111],"margin-right:0.1667em;",[69,800,92],{"className":801},[90,91],[69,803,97],{"className":804},[96],[69,806,563],{"className":807},[90,91],[69,809,811,814],{"className":810},[106],[69,812,107],{"className":813},[106],[69,815,817],{"className":816},[138],[69,818,820],{"className":819},[142],[69,821,823],{"className":822},[146],[69,824,827],{"className":825,"style":826},[150],"height:0.6644em;",[69,828,829,832],{"style":153},[69,830],{"className":831,"style":158},[157],[69,833,835],{"className":834},[162,163,164,165],[69,836,773],{"className":837},[90,91,165],[367,839,840,845,863],{},[385,841,842],{},[271,843,844],{},"e+",[385,846,847,862],{},[69,848,850],{"className":849},[72],[69,851,853],{"className":852,"ariaHidden":77},[76],[69,854,856,859],{"className":855},[81],[69,857],{"className":858,"style":618},[85],[69,860,49],{"className":861},[90]," or more (Kleene plus)",[385,864,865],{},[69,866,868],{"className":867},[72],[69,869,871],{"className":870,"ariaHidden":77},[76],[69,872,874,877,926,929,932,935,938],{"className":873},[81],[69,875],{"className":876,"style":732},[85],[69,878,880,883],{"className":879},[736],[69,881,743],{"className":882,"style":742},[736,740,741],[69,884,886],{"className":885},[138],[69,887,889,918],{"className":888},[142,750],[69,890,892,915],{"className":891},[146],[69,893,895],{"className":894,"style":757},[150],[69,896,897,900],{"style":760},[69,898],{"className":899,"style":158},[157],[69,901,903],{"className":902},[162,163,164,165],[69,904,906,909,912],{"className":905},[90,165],[69,907,773],{"className":908},[90,91,165],[69,910,777],{"className":911},[116,165],[69,913,49],{"className":914},[90,165],[69,916,785],{"className":917},[784],[69,919,921],{"className":920},[146],[69,922,924],{"className":923,"style":792},[150],[69,925],{},[69,927],{"className":928,"style":798},[111],[69,930,92],{"className":931},[90,91],[69,933,97],{"className":934},[96],[69,936,563],{"className":937},[90,91],[69,939,941,944],{"className":940},[106],[69,942,107],{"className":943},[106],[69,945,947],{"className":946},[138],[69,948,950],{"className":949},[142],[69,951,953],{"className":952},[146],[69,954,956],{"className":955,"style":826},[150],[69,957,958,961],{"style":153},[69,959],{"className":960,"style":158},[157],[69,962,964],{"className":963},[162,163,164,165],[69,965,773],{"className":966},[90,91,165],[367,968,969,974,992],{},[385,970,971],{},[271,972,973],{},"e{n}",[385,975,976,977],{},"exactly ",[69,978,980],{"className":979},[72],[69,981,983],{"className":982,"ariaHidden":77},[76],[69,984,986,989],{"className":985},[81],[69,987],{"className":988,"style":218},[85],[69,990,773],{"className":991},[90,91],[385,993,994],{},[69,995,997],{"className":996},[72],[69,998,1000],{"className":999,"ariaHidden":77},[76],[69,1001,1003,1006,1009,1012,1015],{"className":1002},[81],[69,1004],{"className":1005,"style":86},[85],[69,1007,92],{"className":1008},[90,91],[69,1010,97],{"className":1011},[96],[69,1013,563],{"className":1014},[90,91],[69,1016,1018,1021],{"className":1017},[106],[69,1019,107],{"className":1020},[106],[69,1022,1024],{"className":1023},[138],[69,1025,1027],{"className":1026},[142],[69,1028,1030],{"className":1029},[146],[69,1031,1033],{"className":1032,"style":826},[150],[69,1034,1035,1038],{"style":153},[69,1036],{"className":1037,"style":158},[157],[69,1039,1041],{"className":1040},[162,163,164,165],[69,1042,773],{"className":1043},[90,91,165],[367,1045,1046,1051,1086],{},[385,1047,1048],{},[271,1049,1050],{},"e{n,m}",[385,1052,1053,1054,1069,1070],{},"between ",[69,1055,1057],{"className":1056},[72],[69,1058,1060],{"className":1059,"ariaHidden":77},[76],[69,1061,1063,1066],{"className":1062},[81],[69,1064],{"className":1065,"style":218},[85],[69,1067,773],{"className":1068},[90,91]," and ",[69,1071,1073],{"className":1072},[72],[69,1074,1076],{"className":1075,"ariaHidden":77},[76],[69,1077,1079,1082],{"className":1078},[81],[69,1080],{"className":1081,"style":218},[85],[69,1083,1085],{"className":1084},[90,91],"m",[385,1087,1088],{},[69,1089,1091],{"className":1090},[72],[69,1092,1094],{"className":1093,"ariaHidden":77},[76],[69,1095,1097,1101,1170,1173,1176,1179,1182],{"className":1096},[81],[69,1098],{"className":1099,"style":1100},[85],"height:1.1488em;vertical-align:-0.2997em;",[69,1102,1104,1107],{"className":1103},[736],[69,1105,743],{"className":1106,"style":742},[736,740,741],[69,1108,1110],{"className":1109},[138],[69,1111,1113,1161],{"className":1112},[142,750],[69,1114,1116,1158],{"className":1115},[146],[69,1117,1120,1143],{"className":1118,"style":1119},[150],"height:0.8043em;",[69,1121,1122,1125],{"style":760},[69,1123],{"className":1124,"style":158},[157],[69,1126,1128],{"className":1127},[162,163,164,165],[69,1129,1131,1136,1140],{"className":1130},[90,165],[69,1132,1135],{"className":1133,"style":1134},[90,91,165],"margin-right:0.0315em;","k",[69,1137,1139],{"className":1138},[116,165],"=",[69,1141,773],{"className":1142},[90,91,165],[69,1144,1146,1149],{"style":1145},"top:-3.2029em;margin-right:0.05em;",[69,1147],{"className":1148,"style":158},[157],[69,1150,1152],{"className":1151},[162,163,164,165],[69,1153,1155],{"className":1154},[90,165],[69,1156,1085],{"className":1157},[90,91,165],[69,1159,785],{"className":1160},[784],[69,1162,1164],{"className":1163},[146],[69,1165,1168],{"className":1166,"style":1167},[150],"height:0.2997em;",[69,1169],{},[69,1171],{"className":1172,"style":798},[111],[69,1174,92],{"className":1175},[90,91],[69,1177,97],{"className":1178},[96],[69,1180,563],{"className":1181},[90,91],[69,1183,1185,1188],{"className":1184},[106],[69,1186,107],{"className":1187},[106],[69,1189,1191],{"className":1190},[138],[69,1192,1194],{"className":1193},[142],[69,1195,1197],{"className":1196},[146],[69,1198,1201],{"className":1199,"style":1200},[150],"height:0.8491em;",[69,1202,1203,1206],{"style":153},[69,1204],{"className":1205,"style":158},[157],[69,1207,1209],{"className":1208},[162,163,164,165],[69,1210,1135],{"className":1211,"style":1134},[90,91,165],[367,1213,1214,1219,1237],{},[385,1215,1216],{},[271,1217,1218],{},"e{n,}",[385,1220,1221,1222],{},"at least ",[69,1223,1225],{"className":1224},[72],[69,1226,1228],{"className":1227,"ariaHidden":77},[76],[69,1229,1231,1234],{"className":1230},[81],[69,1232],{"className":1233,"style":218},[85],[69,1235,773],{"className":1236},[90,91],[385,1238,1239],{},[69,1240,1242],{"className":1241},[72],[69,1243,1245],{"className":1244,"ariaHidden":77},[76],[69,1246,1248,1252,1302,1305,1308,1311,1314],{"className":1247},[81],[69,1249],{"className":1250,"style":1251},[85],"height:1.244em;vertical-align:-0.3949em;",[69,1253,1255,1258],{"className":1254},[736],[69,1256,743],{"className":1257,"style":742},[736,740,741],[69,1259,1261],{"className":1260},[138],[69,1262,1264,1294],{"className":1263},[142,750],[69,1265,1267,1291],{"className":1266},[146],[69,1268,1271],{"className":1269,"style":1270},[150],"height:0.1864em;",[69,1272,1273,1276],{"style":760},[69,1274],{"className":1275,"style":158},[157],[69,1277,1279],{"className":1278},[162,163,164,165],[69,1280,1282,1285,1288],{"className":1281},[90,165],[69,1283,1135],{"className":1284,"style":1134},[90,91,165],[69,1286,777],{"className":1287},[116,165],[69,1289,773],{"className":1290},[90,91,165],[69,1292,785],{"className":1293},[784],[69,1295,1297],{"className":1296},[146],[69,1298,1300],{"className":1299,"style":792},[150],[69,1301],{},[69,1303],{"className":1304,"style":798},[111],[69,1306,92],{"className":1307},[90,91],[69,1309,97],{"className":1310},[96],[69,1312,563],{"className":1313},[90,91],[69,1315,1317,1320],{"className":1316},[106],[69,1318,107],{"className":1319},[106],[69,1321,1323],{"className":1322},[138],[69,1324,1326],{"className":1325},[142],[69,1327,1329],{"className":1328},[146],[69,1330,1332],{"className":1331,"style":1200},[150],[69,1333,1334,1337],{"style":153},[69,1335],{"className":1336,"style":158},[157],[69,1338,1340],{"className":1339},[162,163,164,165],[69,1341,1135],{"className":1342,"style":1134},[90,91,165],[11,1344,1345,1346,316,1349,1069,1352,1355,1356,316,1359,1407,1408,1411,1412,1415,1416,316,1419,1422,1423,1426,1427,1430,1431,1434,1435,1438],{},"So ",[271,1347,1348],{},"\u002Fcolou?r\u002F",[271,1350,1351],{},"color",[271,1353,1354],{},"colour","; ",[271,1357,1358],{},"\u002Fa*\u002F",[69,1360,1362],{"className":1361},[72],[69,1363,1365],{"className":1364,"ariaHidden":77},[76],[69,1366,1368,1372,1375,1380,1383,1386,1389,1392,1396,1399,1402],{"className":1367},[81],[69,1369],{"className":1370,"style":1371},[85],"height:0.625em;vertical-align:-0.1944em;",[69,1373,659],{"className":1374},[90,91],[69,1376,1379],{"className":1377},[1378],"mpunct",",",[69,1381],{"className":1382,"style":798},[111],[69,1384,43],{"className":1385},[90,91],[69,1387,1379],{"className":1388},[1378],[69,1390],{"className":1391,"style":798},[111],[69,1393,1395],{"className":1394},[90,91],"aa",[69,1397,1379],{"className":1398},[1378],[69,1400],{"className":1401,"style":798},[111],[69,1403,1406],{"className":1404},[1405],"minner","…","; and ",[271,1409,1410],{},"\u002F[0-9]+\u002F"," is the idiom for an integer. The wildcard ",[271,1413,1414],{},"\u002F.\u002F"," (an\nunescaped period) matches any single character, so ",[271,1417,1418],{},"\u002Fbeg.n\u002F",[271,1420,1421],{},"begin",",\n",[271,1424,1425],{},"begun",", and ",[271,1428,1429],{},"beg'n"," alike, and ",[271,1432,1433],{},"\u002Faardvark.*aardvark\u002F"," matches any line where\n",[271,1436,1437],{},"aardvark"," appears twice.",[11,1440,1441,1442,1445,1446,412,1449,1452,1453,1069,1456,1459,1460,1463],{},"The star is ",[60,1443,1444],{},"greedy",": against ",[271,1447,1448],{},"once upon a time",[271,1450,1451],{},"\u002F[a-z]*\u002F"," matches the longest\nprefix run. The non-greedy variants ",[271,1454,1455],{},"*?",[271,1457,1458],{},"+?"," match the ",[15,1461,1462],{},"fewest"," characters\npossible, which matters when a later subpattern must consume the remainder.",[302,1465,1467],{"id":1466},"anchors-disjunction-and-grouping","Anchors, disjunction, and grouping",[11,1469,1470,1473,1474,1477,1478,1481,1482,1485,1486,1489,1490,1493,1494,1497,1498,1501,1502,1505,1506,1509,1510,1512,1513,1516,1517,188],{},[60,1471,1472],{},"Anchors"," match a ",[15,1475,1476],{},"position"," rather than a character. The caret ",[271,1479,1480],{},"^"," (outside\nbrackets) matches the start of a line, ",[271,1483,1484],{},"$"," matches the end, ",[271,1487,1488],{},"\\b"," matches a word\nboundary, and ",[271,1491,1492],{},"\\B"," a non-boundary. So ",[271,1495,1496],{},"\u002F^The\u002F"," finds ",[271,1499,1500],{},"The"," only at the start of a\nline, and ",[271,1503,1504],{},"\u002F\\bthe\\b\u002F"," matches the word ",[271,1507,1508],{},"the"," but not ",[271,1511,1508],{}," buried inside ",[271,1514,1515],{},"other"," or\n",[271,1518,1519],{},"theology",[11,1521,1522,1523,1526,1527,1530,1531,316,1534,319,1537,1540,1541,316,1544,319,1547,412,1550,1552,319,1554,1557,1558,1561,1562,316,1565,1069,1567,1569,1570,1573,1574,316,1577,412,1580,412,1583,188],{},"The ",[60,1524,1525],{},"disjunction"," operator ",[271,1528,1529],{},"|"," (the pipe) matches either of two whole patterns:\n",[271,1532,1533],{},"\u002Fcat|dog\u002F",[271,1535,1536],{},"cat",[271,1538,1539],{},"dog",". Disjunction has very low precedence — it splits\nthe pattern at the widest scope — so ",[271,1542,1543],{},"\u002Fguppy|ies\u002F",[271,1545,1546],{},"guppy",[271,1548,1549],{},"ies",[15,1551,358],{},[271,1553,1546],{},[271,1555,1556],{},"guppies",". To scope the disjunction, use ",[60,1559,1560],{},"grouping"," parentheses:\n",[271,1563,1564],{},"\u002Fgupp(y|ies)\u002F",[271,1566,1546],{},[271,1568,1556],{},", because the parentheses make\n",[271,1571,1572],{},"(y|ies)"," behave as a single element. Grouping also lets a counter apply to a whole\nsub-pattern rather than one character: ",[271,1575,1576],{},"\u002F(ab)+\u002F",[271,1578,1579],{},"ab",[271,1581,1582],{},"abab",[271,1584,1585],{},"ababab",[11,1587,1588,1589,1592,1593,1596,1597,412,1600,1603,1604,1607,1608,1611,1612,1615,1616,1619,1620,67,1623,1626],{},"Parentheses have a second job. A ",[60,1590,1591],{},"capture group"," stores whatever its sub-pattern\nmatched in a numbered ",[60,1594,1595],{},"register",", referred to later by ",[271,1598,1599],{},"\\1",[271,1601,1602],{},"\\2",", and so on. This\nmakes substitutions expressive: the substitution ",[271,1605,1606],{},"s\u002F([0-9]+)\u002F\u003C\\1>\u002F"," wraps every\ninteger in angle brackets, and ",[271,1609,1610],{},"\u002Fthe (.*)er they were, the \\1er they will be\u002F","\nforces the two blanks to match the ",[15,1613,1614],{},"same"," string, so it accepts ",[31,1617,1618],{},"the bigger they were, the bigger they will be"," but rejects a mismatched pair. When you want the\ngrouping but not the register, a ",[60,1621,1622],{},"non-capturing group",[271,1624,1625],{},"(?:...)"," groups without\nconsuming a register number.",[11,1628,1629],{},"The precedence order, highest to lowest, is the one fact that resolves most\nambiguous patterns:",[361,1631,1632,1644],{},[364,1633,1634],{},[367,1635,1636,1639,1642],{},[370,1637,1638],{},"Precedence",[370,1640,1641],{},"Operators",[370,1643,378],{},[380,1645,1646,1659,1671,1688],{},[367,1647,1648,1651,1654],{},[385,1649,1650],{},"highest",[385,1652,1653],{},"parentheses",[385,1655,1656],{},[271,1657,1658],{},"(...)",[367,1660,1661,1663,1666],{},[385,1662],{},[385,1664,1665],{},"counters",[385,1667,1668],{},[271,1669,1670],{},"* + ? {n,m}",[367,1672,1673,1675,1678],{},[385,1674],{},[385,1676,1677],{},"sequences and anchors",[385,1679,1680,412,1682,412,1685],{},[271,1681,1508],{},[271,1683,1684],{},"^my",[271,1686,1687],{},"end$",[367,1689,1690,1693,1695],{},[385,1691,1692],{},"lowest",[385,1694,1525],{},[385,1696,1697],{},[271,1698,1529],{},[11,1700,1701,1702,316,1705,412,1707,412,1709,1422,1712,1715,1716,1718,1719,316,1722,319,1724,1727,1728,1730,1731,1733,1734,1736,1737,188],{},"Because counters bind tighter than sequences, ",[271,1703,1704],{},"\u002Fthe*\u002F",[271,1706,370],{},[271,1708,1508],{},[271,1710,1711],{},"thee",[271,1713,1714],{},"theee"," — the star attaches to ",[271,1717,563],{},", not to the whole word. Because sequences bind\ntighter than disjunction, ",[271,1720,1721],{},"\u002Fthe|any\u002F",[271,1723,1508],{},[271,1725,1726],{},"any",", not ",[271,1729,370],{}," followed by\n",[271,1732,563],{},"-or-",[271,1735,43],{}," followed by ",[271,1738,1739],{},"ny",[1741,1742],"tikz-figure",{"hash":1743},"9341cb28366ed242c0331bb49a6d42a025082b2ddda7e873caa3a51714e89d96",[11,1745,1746,1747,1750,1751,1754,1755,1758,1759,1762,1763,1766,1767,1770,1771,1774,1775,1778,1779,188],{},"Two more operators round out the language. ",[60,1748,1749],{},"Substitution",", written\n",[271,1752,1753],{},"s\u002Fpattern\u002Freplacement\u002F",", rewrites every match — ",[271,1756,1757],{},"s\u002Fcolour\u002Fcolor\u002F"," Americanizes a\ndocument. ",[60,1760,1761],{},"Lookahead assertions"," test whether a pattern matches ",[15,1764,1765],{},"without","\nconsuming any input: ",[271,1768,1769],{},"(?=...)"," is positive lookahead, ",[271,1772,1773],{},"(?!...)"," negative, both\nzero-width. Negative lookahead expresses exclusions cleanly — ",[271,1776,1777],{},"\u002F^(?!Volcano)[A-Za-z]+\u002F","\nmatches any opening word that is not ",[271,1780,1781],{},"Volcano",[11,1783,1784,1785,1788,1789,1809,1810,1813,1814,1833,1834,1379],{},"Pattern design balances two error types. A loose pattern produces ",[60,1786,1787],{},"false positives","\n(",[69,1790,1792],{"className":1791},[72],[69,1793,1795],{"className":1794,"ariaHidden":77},[76],[69,1796,1798,1801],{"className":1797},[81],[69,1799],{"className":1800,"style":184},[85],[69,1802,1804],{"className":1803},[90],[69,1805,1808],{"className":1806},[90,1807],"mathrm","FP",", matching excluded strings); a tight pattern produces ",[60,1811,1812],{},"false\nnegatives"," (",[69,1815,1817],{"className":1816},[72],[69,1818,1820],{"className":1819,"ariaHidden":77},[76],[69,1821,1823,1826],{"className":1822},[81],[69,1824],{"className":1825,"style":184},[85],[69,1827,1829],{"className":1828},[90],[69,1830,1832],{"className":1831},[90,1807],"FN",", missing intended strings). With true positives\n",[69,1835,1837],{"className":1836},[72],[69,1838,1840],{"className":1839,"ariaHidden":77},[76],[69,1841,1843,1846],{"className":1842},[81],[69,1844],{"className":1845,"style":184},[85],[69,1847,1849],{"className":1848},[90],[69,1850,1852],{"className":1851},[90,1807],"TP",[69,1854,1857],{"className":1855},[1856],"katex-display",[69,1858,1860],{"className":1859},[72],[69,1861,1863,1887,2014],{"className":1862,"ariaHidden":77},[76],[69,1864,1866,1870,1878,1881,1884],{"className":1865},[81],[69,1867],{"className":1868,"style":1869},[85],"height:0.8623em;vertical-align:-0.1944em;",[69,1871,1874],{"className":1872},[90,1873],"text",[69,1875,1877],{"className":1876},[90],"precision",[69,1879],{"className":1880,"style":112},[111],[69,1882,1139],{"className":1883},[116],[69,1885],{"className":1886,"style":112},[111],[69,1888,1890,1894,1988,1991,1995,1998,2005,2008,2011],{"className":1889},[81],[69,1891],{"className":1892,"style":1893},[85],"height:2.1297em;vertical-align:-0.7693em;",[69,1895,1897,1901,1985],{"className":1896},[90],[69,1898],{"className":1899},[96,1900],"nulldelimiter",[69,1902,1905],{"className":1903},[1904],"mfrac",[69,1906,1908,1976],{"className":1907},[142,750],[69,1909,1911,1973],{"className":1910},[146],[69,1912,1915,1947,1958],{"className":1913,"style":1914},[150],"height:1.3603em;",[69,1916,1918,1922],{"style":1917},"top:-2.314em;",[69,1919],{"className":1920,"style":1921},[157],"height:3em;",[69,1923,1925,1931,1934,1938,1941],{"className":1924},[90],[69,1926,1928],{"className":1927},[90],[69,1929,1852],{"className":1930},[90,1807],[69,1932],{"className":1933,"style":667},[111],[69,1935,1937],{"className":1936},[169],"+",[69,1939],{"className":1940,"style":667},[111],[69,1942,1944],{"className":1943},[90],[69,1945,1808],{"className":1946},[90,1807],[69,1948,1950,1953],{"style":1949},"top:-3.23em;",[69,1951],{"className":1952,"style":1921},[157],[69,1954],{"className":1955,"style":1957},[1956],"frac-line","border-bottom-width:0.04em;",[69,1959,1961,1964],{"style":1960},"top:-3.677em;",[69,1962],{"className":1963,"style":1921},[157],[69,1965,1967],{"className":1966},[90],[69,1968,1970],{"className":1969},[90],[69,1971,1852],{"className":1972},[90,1807],[69,1974,785],{"className":1975},[784],[69,1977,1979],{"className":1978},[146],[69,1980,1983],{"className":1981,"style":1982},[150],"height:0.7693em;",[69,1984],{},[69,1986],{"className":1987},[106,1900],[69,1989,1379],{"className":1990},[1378],[69,1992],{"className":1993,"style":1994},[111],"margin-right:2em;",[69,1996],{"className":1997,"style":798},[111],[69,1999,2001],{"className":2000},[90,1873],[69,2002,2004],{"className":2003},[90],"recall",[69,2006],{"className":2007,"style":112},[111],[69,2009,1139],{"className":2010},[116],[69,2012],{"className":2013,"style":112},[111],[69,2015,2017,2020,2103],{"className":2016},[81],[69,2018],{"className":2019,"style":1893},[85],[69,2021,2023,2026,2100],{"className":2022},[90],[69,2024],{"className":2025},[96,1900],[69,2027,2029],{"className":2028},[1904],[69,2030,2032,2092],{"className":2031},[142,750],[69,2033,2035,2089],{"className":2034},[146],[69,2036,2038,2067,2075],{"className":2037,"style":1914},[150],[69,2039,2040,2043],{"style":1917},[69,2041],{"className":2042,"style":1921},[157],[69,2044,2046,2052,2055,2058,2061],{"className":2045},[90],[69,2047,2049],{"className":2048},[90],[69,2050,1852],{"className":2051},[90,1807],[69,2053],{"className":2054,"style":667},[111],[69,2056,1937],{"className":2057},[169],[69,2059],{"className":2060,"style":667},[111],[69,2062,2064],{"className":2063},[90],[69,2065,1832],{"className":2066},[90,1807],[69,2068,2069,2072],{"style":1949},[69,2070],{"className":2071,"style":1921},[157],[69,2073],{"className":2074,"style":1957},[1956],[69,2076,2077,2080],{"style":1960},[69,2078],{"className":2079,"style":1921},[157],[69,2081,2083],{"className":2082},[90],[69,2084,2086],{"className":2085},[90],[69,2087,1852],{"className":2088},[90,1807],[69,2090,785],{"className":2091},[784],[69,2093,2095],{"className":2094},[146],[69,2096,2098],{"className":2097,"style":1982},[150],[69,2099],{},[69,2101],{"className":2102},[106,1900],[69,2104,188],{"className":2105},[90],[11,2107,2108,2109,2127,2128,2146,2147],{},"Tightening to cut ",[69,2110,2112],{"className":2111},[72],[69,2113,2115],{"className":2114,"ariaHidden":77},[76],[69,2116,2118,2121],{"className":2117},[81],[69,2119],{"className":2120,"style":184},[85],[69,2122,2124],{"className":2123},[90],[69,2125,1808],{"className":2126},[90,1807]," raises precision; loosening to cut ",[69,2129,2131],{"className":2130},[72],[69,2132,2134],{"className":2133,"ariaHidden":77},[76],[69,2135,2137,2140],{"className":2136},[81],[69,2138],{"className":2139,"style":184},[85],[69,2141,2143],{"className":2142},[90],[69,2144,1832],{"className":2145},[90,1807],"\nraises recall. Every pattern trades one against the other.",[40,2148,2149],{},[43,2150,2154],{"href":2151,"ariaDescribedBy":2152,"dataFootnoteRef":6,"id":2153},"#user-content-fn-jm-precision",[47],"user-content-fnref-jm-precision","3",[52,2156,2158],{"id":2157},"text-normalization","Text normalization",[11,2160,2161,2162,2165,2166,2169,2170,2173,2174,2177,2178],{},"Before almost any language processing, the text must be ",[60,2163,2164],{},"normalized"," into a\nstandard form. Three tasks make up nearly every normalization pipeline: ",[60,2167,2168],{},"tokenizing","\nwords, ",[60,2171,2172],{},"normalizing"," word formats, and ",[60,2175,2176],{},"segmenting"," sentences.",[40,2179,2180],{},[43,2181,2185],{"href":2182,"ariaDescribedBy":2183,"dataFootnoteRef":6,"id":2184},"#user-content-fn-jm-norm",[47],"user-content-fnref-jm-norm","4",[302,2187,2189],{"id":2188},"tokenization","Tokenization",[11,2191,2192,2194,2195,2198,2199,412,2202,1426,2205,2208,2209,2212,2213,2216,2217,1069,2220,2223,2224,2227,2228,2231,2232,1069,2235,2238],{},[60,2193,2189],{}," is the task of segmenting running text into words, or ",[60,2196,2197],{},"tokens",".\nThe naive rule — split on whitespace — fails immediately, in both directions. It\nsplits too little: ",[271,2200,2201],{},"Ph.D.",[271,2203,2204],{},"AT&T",[271,2206,2207],{},"m.p.h."," contain internal punctuation that\nbelongs to the token, and prices like ",[271,2210,2211],{},"$45.55"," or dates like ",[271,2214,2215],{},"01\u002F02\u002F06"," must not be\ndiced at the period. It also splits too much: ",[271,2218,2219],{},"New York",[271,2221,2222],{},"rock 'n' roll"," are\narguably single tokens despite their spaces, and a ",[60,2225,2226],{},"clitic"," contraction like\n",[271,2229,2230],{},"what're"," should expand to the two tokens ",[271,2233,2234],{},"what",[271,2236,2237],{},"are",". Punctuation itself is\nusually worth keeping as its own token — commas cue parsers, periods cue sentence\nboundaries, question marks carry meaning — rather than discarded.",[11,2240,2241,2242,2245,2246,2249,2250,67,2253,2256,2257,2260,2261,2284,2285,67,2287,2304,2305,224,2376,2412,2413,2429],{},"Tokenization runs first, so it must be fast: the standard approach compiles a\ndeterministic RE into a finite-state automaton. The ",[60,2243,2244],{},"Penn Treebank"," standard\nseparates clitics (",[271,2247,2248],{},"doesn't"," → ",[271,2251,2252],{},"does",[271,2254,2255],{},"n't","), keeps hyphenated words together, and\nsplits off punctuation. Two counts recur throughout the subject: the number of\ndistinct words, the ",[60,2258,2259],{},"types"," or vocabulary size ",[69,2262,2264],{"className":2263},[72],[69,2265,2267],{"className":2266,"ariaHidden":77},[76],[69,2268,2270,2273,2277,2281],{"className":2269},[81],[69,2271],{"className":2272,"style":86},[85],[69,2274,2276],{"className":2275},[90],"∣",[69,2278,2280],{"className":2279,"style":667},[90,91],"V",[69,2282,2276],{"className":2283},[90],", and the total number of\nrunning words, the ",[60,2286,2197],{},[69,2288,2290],{"className":2289},[72],[69,2291,2293],{"className":2292,"ariaHidden":77},[76],[69,2294,2296,2299],{"className":2295},[81],[69,2297],{"className":2298,"style":184},[85],[69,2300,2303],{"className":2301,"style":2302},[90,91],"margin-right:0.109em;","N",". Empirically the two grow together as ",[69,2306,2308],{"className":2307},[72],[69,2309,2311,2336],{"className":2310,"ariaHidden":77},[76],[69,2312,2314,2317,2320,2323,2326,2329,2333],{"className":2313},[81],[69,2315],{"className":2316,"style":86},[85],[69,2318,2276],{"className":2319},[90],[69,2321,2280],{"className":2322,"style":667},[90,91],[69,2324,2276],{"className":2325},[90],[69,2327],{"className":2328,"style":112},[111],[69,2330,2332],{"className":2331},[116],"∝",[69,2334],{"className":2335,"style":112},[111],[69,2337,2339,2342],{"className":2338},[81],[69,2340],{"className":2341,"style":1200},[85],[69,2343,2345,2348],{"className":2344},[90],[69,2346,2303],{"className":2347,"style":2302},[90,91],[69,2349,2351],{"className":2350},[138],[69,2352,2354],{"className":2353},[142],[69,2355,2357],{"className":2356},[146],[69,2358,2360],{"className":2359,"style":1200},[150],[69,2361,2362,2365],{"style":153},[69,2363],{"className":2364,"style":158},[157],[69,2366,2368],{"className":2367},[162,163,164,165],[69,2369,2371],{"className":2370},[90,165],[69,2372,2375],{"className":2373,"style":2374},[90,91,165],"margin-right:0.0528em;","β",[69,2377,2379],{"className":2378},[72],[69,2380,2382,2402],{"className":2381,"ariaHidden":77},[76],[69,2383,2385,2389,2392,2395,2399],{"className":2384},[81],[69,2386],{"className":2387,"style":2388},[85],"height:0.8889em;vertical-align:-0.1944em;",[69,2390,2375],{"className":2391,"style":2374},[90,91],[69,2393],{"className":2394,"style":112},[111],[69,2396,2398],{"className":2397},[116],"≈",[69,2400],{"className":2401,"style":112},[111],[69,2403,2405,2408],{"className":2404},[81],[69,2406],{"className":2407,"style":618},[85],[69,2409,2411],{"className":2410},[90],"0.67","–",[69,2414,2416],{"className":2415},[72],[69,2417,2419],{"className":2418,"ariaHidden":77},[76],[69,2420,2422,2425],{"className":2421},[81],[69,2423],{"className":2424,"style":618},[85],[69,2426,2428],{"className":2427},[90],"0.75"," (Herdan's law), so vocabulary keeps\nexpanding with corpus size.",[11,2431,2432,2433,2436,2437,2440,2441,2444],{},"Not every language separates words with spaces. Chinese writes characters (",[60,2434,2435],{},"hanzi",")\nwith no delimiters, and boundary judgments disagree even among native speakers; many\nChinese tasks take each character as the token. Japanese and Thai require dedicated\n",[60,2438,2439],{},"word-segmentation"," models. These difficulties motivate a third option that\nsidesteps the definition of a ",[31,2442,2443],{},"word"," altogether.",[302,2446,2448],{"id":2447},"byte-pair-encoding","Byte-pair encoding",[11,2450,2451,2452,412,2455,2458,2459,2462,2463,2466,2467,2469,2470,2473,2474,2477,2478,319,2481,2484,2485],{},"Words are a leaky abstraction for a model. A system trained on ",[271,2453,2454],{},"low",[271,2456,2457],{},"new",", and\n",[271,2460,2461],{},"newer"," but never ",[271,2464,2465],{},"lower"," cannot represent ",[271,2468,2465],{}," at test time — the ",[60,2471,2472],{},"unknown-word","\n(out-of-vocabulary) problem. Modern tokenizers avoid it with a vocabulary of\n",[60,2475,2476],{},"subwords",": units smaller than words, often morphemes like ",[271,2479,2480],{},"-er",[271,2482,2483],{},"-est",", so any\nunseen word is spelled from known pieces.",[40,2486,2487],{},[43,2488,2492],{"href":2489,"ariaDescribedBy":2490,"dataFootnoteRef":6,"id":2491},"#user-content-fn-jm-bpe",[47],"user-content-fnref-jm-bpe","5",[11,2494,2495,2496,2499,2500,2503,2504,2519,2520,2523,2524,2539,2540,2556,2557,2572,2573,188],{},"The dominant scheme is ",[60,2497,2498],{},"byte-pair encoding"," (BPE), in two halves: a ",[15,2501,2502],{},"token learner","\ninducing a vocabulary ",[69,2505,2507],{"className":2506},[72],[69,2508,2510],{"className":2509,"ariaHidden":77},[76],[69,2511,2513,2516],{"className":2512},[81],[69,2514],{"className":2515,"style":184},[85],[69,2517,2280],{"className":2518,"style":667},[90,91]," from a corpus, and a ",[15,2521,2522],{},"token segmenter"," applying it to new\ntext. The learner initializes ",[69,2525,2527],{"className":2526},[72],[69,2528,2530],{"className":2529,"ariaHidden":77},[76],[69,2531,2533,2536],{"className":2532},[81],[69,2534],{"className":2535,"style":184},[85],[69,2537,2280],{"className":2538,"style":667},[90,91]," to the character set, then for ",[69,2541,2543],{"className":2542},[72],[69,2544,2546],{"className":2545,"ariaHidden":77},[76],[69,2547,2549,2553],{"className":2548},[81],[69,2550],{"className":2551,"style":2552},[85],"height:0.6944em;",[69,2554,1135],{"className":2555,"style":1134},[90,91]," iterations\nselects the most frequent adjacent symbol pair, merges it into a new symbol, and adds\nit to ",[69,2558,2560],{"className":2559},[72],[69,2561,2563],{"className":2562,"ariaHidden":77},[76],[69,2564,2566,2569],{"className":2565},[81],[69,2567],{"className":2568,"style":184},[85],[69,2570,2280],{"className":2571,"style":667},[90,91],". This yields ",[69,2574,2576],{"className":2575},[72],[69,2577,2579,2603,2622],{"className":2578,"ariaHidden":77},[76],[69,2580,2582,2585,2588,2591,2594,2597,2600],{"className":2581},[81],[69,2583],{"className":2584,"style":86},[85],[69,2586,2276],{"className":2587},[90],[69,2589,2280],{"className":2590,"style":667},[90,91],[69,2592,2276],{"className":2593},[90],[69,2595],{"className":2596,"style":112},[111],[69,2598,1139],{"className":2599},[116],[69,2601],{"className":2602,"style":112},[111],[69,2604,2606,2609,2613,2616,2619],{"className":2605},[81],[69,2607],{"className":2608,"style":86},[85],[69,2610,2612],{"className":2611},[90],"∣Σ∣",[69,2614],{"className":2615,"style":667},[111],[69,2617,1937],{"className":2618},[169],[69,2620],{"className":2621,"style":667},[111],[69,2623,2625,2628],{"className":2624},[81],[69,2626],{"className":2627,"style":2552},[85],[69,2629,1135],{"className":2630,"style":1134},[90,91],[2632,2633,2637],"pre",{"className":2634,"code":2635,"language":2636,"meta":6,"style":6},"language-algorithm shiki shiki-themes Vesper Light - Orange Boost (Quick Open Adjusted) vesper","caption: $\\textsc{Byte-Pair-Encoding}(C, k)$ — learn a subword vocabulary from corpus $C$ with $k$ merges\ninput: corpus $C$ (words as character sequences with a word-end marker), number of merges $k$\n$V \\gets$ set of all distinct characters in $C$\nfor $i = 1$ to $k$ do\n  $(t_L, t_R) \\gets$ most frequent adjacent pair of symbols in $C$\n  $t_{\\text{new}} \\gets t_L + t_R$ \u002F\u002F concatenate into one new symbol\n  $V \\gets V \\cup \\{t_{\\text{new}}\\}$\n  replace every occurrence of $(t_L, t_R)$ in $C$ with $t_{\\text{new}}$\nreturn $V$\n","algorithm",[271,2638,2639,2646,2652,2658,2664,2670,2676,2682,2688],{"__ignoreMap":6},[69,2640,2643],{"class":2641,"line":2642},"line",1,[69,2644,2645],{},"caption: $\\textsc{Byte-Pair-Encoding}(C, k)$ — learn a subword vocabulary from corpus $C$ with $k$ merges\n",[69,2647,2649],{"class":2641,"line":2648},2,[69,2650,2651],{},"input: corpus $C$ (words as character sequences with a word-end marker), number of merges $k$\n",[69,2653,2655],{"class":2641,"line":2654},3,[69,2656,2657],{},"$V \\gets$ set of all distinct characters in $C$\n",[69,2659,2661],{"class":2641,"line":2660},4,[69,2662,2663],{},"for $i = 1$ to $k$ do\n",[69,2665,2667],{"class":2641,"line":2666},5,[69,2668,2669],{},"  $(t_L, t_R) \\gets$ most frequent adjacent pair of symbols in $C$\n",[69,2671,2673],{"class":2641,"line":2672},6,[69,2674,2675],{},"  $t_{\\text{new}} \\gets t_L + t_R$ \u002F\u002F concatenate into one new symbol\n",[69,2677,2679],{"class":2641,"line":2678},7,[69,2680,2681],{},"  $V \\gets V \\cup \\{t_{\\text{new}}\\}$\n",[69,2683,2685],{"class":2641,"line":2684},8,[69,2686,2687],{},"  replace every occurrence of $(t_L, t_R)$ in $C$ with $t_{\\text{new}}$\n",[69,2689,2691],{"class":2641,"line":2690},9,[69,2692,2693],{},"return $V$\n",[11,2695,2696,2697,2700,2701,2703,2704,2706,2707,2709,2710,2713,2714,2716,2717,2720,2721,1069,2723,2725,2726,2729,2730,2733,2734,2729,2737,34,2740,2743],{},"Run inside words with a special end-of-word marker ",[271,2698,2699],{},"_",", on a tiny corpus of counted\nword tokens (",[271,2702,2454],{}," × 5, ",[271,2705,1692],{}," × 2, ",[271,2708,2461],{}," × 6, ",[271,2711,2712],{},"wider"," × 3, ",[271,2715,2457],{}," × 2), the\nfirst merges are easy to trace by hand. The pair ",[271,2718,2719],{},"e r"," is most frequent (9\noccurrences, across ",[271,2722,2461],{},[271,2724,2712],{},"), so it merges to ",[271,2727,2728],{},"er","; then ",[271,2731,2732],{},"er _"," merges\nto ",[271,2735,2736],{},"er_",[271,2738,2739],{},"n e",[271,2741,2742],{},"ne",", and so on.",[1741,2745],{"hash":2746},"a3acb08b8181f15c7e8de609d1d2dd38aa356c616cfb5a1a28ee1573eb6cc21a",[11,2748,2749,2750,2752,2753,1069,2755,2757],{},"The segmenter applies the learned merges, in the order learned, to new text. A word\nseen in training collapses back to a few symbols; a genuinely novel word like\n",[271,2751,2465],{}," is left as the pieces ",[271,2754,2454],{},[271,2756,2736],{},". With thousands of merges on a real\ncorpus the effect is that common words become single tokens and only the rare and\nunknown ones get spelled out of parts — exactly the behavior a language model needs.",[11,2759,2760,2761,2249,2763,1422,2765,2249,2767,412,2769,2249,2771,412,2773,2249,2776,412,2778,2249,2781,412,2784,2249,2787,2789,2790,2793,2794,2797,2798,2800,2801,2804,2805,2800,2807,1355,2810,1069,2812,2814,2815,2817,2818,1355,2821,2800,2823,2826,2827,2829,2830,2832,2833,2835,2836,2838],{},"To see the segmenter run, take the learned merge list (in order) ",[271,2762,2719],{},[271,2764,2728],{},[271,2766,2732],{},[271,2768,2736],{},[271,2770,2739],{},[271,2772,2742],{},[271,2774,2775],{},"ne w",[271,2777,2457],{},[271,2779,2780],{},"l o",[271,2782,2783],{},"lo",[271,2785,2786],{},"lo w",[271,2788,2454],{},", and\napply it to the unseen word ",[271,2791,2792],{},"lower_",". Start from characters, ",[271,2795,2796],{},"l o w e r _",", and scan\nfor the first applicable merge in learned order. ",[271,2799,2719],{}," fires, giving ",[271,2802,2803],{},"l o w er _",";\nthen ",[271,2806,2732],{},[271,2808,2809],{},"l o w er_",[271,2811,2739],{},[271,2813,2775],{}," do not apply; ",[271,2816,2780],{}," fires,\ngiving ",[271,2819,2820],{},"lo w er_",[271,2822,2786],{},[271,2824,2825],{},"low er_",". No further merge applies, so\n",[271,2828,2792],{}," segments as ",[271,2831,2454],{}," + ",[271,2834,2736],{}," — two known pieces the model has embeddings for,\neven though ",[271,2837,2465],{}," never appeared in training. The unknown-word problem is dissolved:\nthere is no out-of-vocabulary word, only a longer or shorter spelling out of subwords.",[1741,2840],{"hash":2841},"07c84ab20b48f1a5ab48789e3f312d72cfe82404c236942fd04dc80ff150ec3d",[302,2843,2845],{"id":2844},"word-normalization-lemmatization-and-stemming","Word normalization, lemmatization, and stemming",[11,2847,2848,2849,2852,2853,412,2856,1426,2859,2862,2863,1069,2866,2869,2870,2873,2874,1069,2876,2878,2879,2881,2882,2885],{},"Even after tokenizing, the same word appears in many surface forms. ",[60,2850,2851],{},"Word normalization"," puts\ntokens into a standard form: mapping ",[271,2854,2855],{},"US",[271,2857,2858],{},"U.S.",[271,2860,2861],{},"USA"," to one representation,\nor collapsing ",[271,2864,2865],{},"uh-huh",[271,2867,2868],{},"uhhuh",". ",[60,2871,2872],{},"Case folding"," — mapping everything to\nlowercase — is the bluntest version, and it helps for information retrieval, where a\nsearcher wants ",[271,2875,299],{},[271,2877,288],{}," treated alike. But case folding is not\nalways wanted: for sentiment analysis and machine translation the difference between\n",[271,2880,2855],{}," the country and ",[271,2883,2884],{},"us"," the pronoun can outweigh the generalization it buys.",[11,2887,2888,2889,2892,2893,412,2896,1426,2898,2901,2902,67,2905,1355,2908,1069,2911,34,2914,2916,2917,2920,2921,2924,2925,2928,2929,2932,2933,412,2936,412,2939,2942,2943,2946,2947],{},"A deeper normalization collapses inflected forms. ",[60,2890,2891],{},"Lemmatization"," determines that\ntwo words share a root despite surface differences: ",[271,2894,2895],{},"am",[271,2897,2237],{},[271,2899,2900],{},"is"," all reduce\nto the ",[60,2903,2904],{},"lemma",[271,2906,2907],{},"be",[271,2909,2910],{},"dinner",[271,2912,2913],{},"dinners",[271,2915,2910],{},". Done properly it requires\n",[60,2918,2919],{},"morphological parsing"," — decomposing a word into its ",[60,2922,2923],{},"morphemes",", the smallest\nmeaning-bearing units, split into ",[60,2926,2927],{},"stems"," (the core meaning) and ",[60,2930,2931],{},"affixes"," (the\n",[271,2934,2935],{},"-s",[271,2937,2938],{},"-ed",[271,2940,2941],{},"-ing"," that modify it). Lemmatizing ",[31,2944,2945],{},"He is reading detective stories","\nyields ",[31,2948,2949],{},"He be read detective story.",[11,2951,2952,2953,2956,2957,2960,2961,2969],{},"Full morphological parsing is expensive; ",[60,2954,2955],{},"stemming"," is the cheaper shortcut,\nchopping affixes off the word end. The ",[60,2958,2959],{},"Porter stemmer"," is the classic instance: a\ncascade of rewrite rules applied in series, each pass feeding the next.",[40,2962,2963],{},[43,2964,2968],{"href":2965,"ariaDescribedBy":2966,"dataFootnoteRef":6,"id":2967},"#user-content-fn-jm-porter",[47],"user-content-fnref-jm-porter","6"," A\nsampling of its rules:",[361,2971,2972,2981],{},[364,2973,2974],{},[367,2975,2976,2979],{},[370,2977,2978],{},"Rule",[370,2980,378],{},[380,2982,2983,2996,3022],{},[367,2984,2985,2993],{},[385,2986,2987,2249,2990],{},[271,2988,2989],{},"ATIONAL",[271,2991,2992],{},"ATE",[385,2994,2995],{},"relational → relate",[367,2997,2998,3019],{},[385,2999,3000,2249,3003,3018],{},[271,3001,3002],{},"ING",[69,3004,3006],{"className":3005},[72],[69,3007,3009],{"className":3008,"ariaHidden":77},[76],[69,3010,3012,3015],{"className":3011},[81],[69,3013],{"className":3014,"style":218},[85],[69,3016,659],{"className":3017},[90,91]," (if stem has a vowel)",[385,3020,3021],{},"motoring → motor",[367,3023,3024,3032],{},[385,3025,3026,2249,3029],{},[271,3027,3028],{},"SSES",[271,3030,3031],{},"SS",[385,3033,3034],{},"grasses → grass",[11,3036,3037,3038,1788,3041,2249,3044,412,3047,2249,3050,3053,3054,1813,3057,3060,3061,3064],{},"Stemming is fast and dictionary-free, but it errs in both directions — ",[60,3039,3040],{},"over-generalizing",[271,3042,3043],{},"organization",[271,3045,3046],{},"organ",[271,3048,3049],{},"policy",[271,3051,3052],{},"police",") and ",[60,3055,3056],{},"under-generalizing",[271,3058,3059],{},"European","\nand ",[271,3062,3063],{},"Europe"," left unmerged). It is a useful approximation, not a substitute for real\nmorphology.",[302,3066,3068],{"id":3067},"the-subword-tokenizers-behind-modern-models","The subword tokenizers behind modern models",[11,3070,3071,3072,3075,3076,3084],{},"The byte-pair encoding above was introduced for text ",[15,3073,3074],{},"compression"," (Gage, 1994); its\nadaptation to NLP is more recent and is worth stating precisely, because the exact\ntokenizer a model uses shapes what it can represent. Sennrich, Haddow & Birch (2016,\nACL) reintroduced BPE as a tokenization method for neural machine translation, and\ntheir motivation was the same open-vocabulary problem the previous section named:\na translation model with a fixed word vocabulary cannot emit a word it never saw,\nand it is the rare words — names, compounds, morphologically rich forms — that\nmatter most.",[40,3077,3078],{},[43,3079,3083],{"href":3080,"ariaDescribedBy":3081,"dataFootnoteRef":6,"id":3082},"#user-content-fn-sennrich",[47],"user-content-fnref-sennrich","7"," Splitting into subword units let a single fixed-size\nvocabulary spell out any word, and it improved translation of rare and unseen words.\nThat paper is why nearly every transformer since tokenizes into subwords.",[11,3086,3087],{},"Three variants dominate, differing in the merge or split criterion.",[361,3089,3090,3136],{},[364,3091,3092],{},[367,3093,3094,3097,3100,3133],{},[370,3095,3096],{},"Tokenizer",[370,3098,3099],{},"Direction",[370,3101,3102,3103],{},"Criterion for a pair ",[69,3104,3106],{"className":3105},[72],[69,3107,3109],{"className":3108,"ariaHidden":77},[76],[69,3110,3112,3115,3118,3121,3124,3127,3130],{"className":3111},[81],[69,3113],{"className":3114,"style":86},[85],[69,3116,97],{"className":3117},[96],[69,3119,43],{"className":3120},[90,91],[69,3122,1379],{"className":3123},[1378],[69,3125],{"className":3126,"style":798},[111],[69,3128,415],{"className":3129},[90,91],[69,3131,107],{"className":3132},[106],[370,3134,3135],{},"Used by",[380,3137,3138,3178,3304],{},[367,3139,3140,3145,3148,3175],{},[385,3141,3142],{},[60,3143,3144],{},"BPE",[385,3146,3147],{},"bottom-up merge",[385,3149,3150,3151],{},"maximize count ",[69,3152,3154],{"className":3153},[72],[69,3155,3157],{"className":3156,"ariaHidden":77},[76],[69,3158,3160,3163,3166,3169,3172],{"className":3159},[81],[69,3161],{"className":3162,"style":86},[85],[69,3164,418],{"className":3165},[90,91],[69,3167,97],{"className":3168},[96],[69,3170,1579],{"className":3171},[90,91],[69,3173,107],{"className":3174},[106],[385,3176,3177],{},"GPT-2, GPT-3",[367,3179,3180,3185,3187,3301],{},[385,3181,3182],{},[60,3183,3184],{},"WordPiece",[385,3186,3147],{},[385,3188,3189,3190,3300],{},"maximize ",[69,3191,3193],{"className":3192},[72],[69,3194,3196],{"className":3195,"ariaHidden":77},[76],[69,3197,3199,3203],{"className":3198},[81],[69,3200],{"className":3201,"style":3202},[85],"height:2.363em;vertical-align:-0.936em;",[69,3204,3206,3209,3297],{"className":3205},[90],[69,3207],{"className":3208},[96,1900],[69,3210,3212],{"className":3211},[1904],[69,3213,3215,3288],{"className":3214},[142,750],[69,3216,3218,3285],{"className":3217},[146],[69,3219,3222,3257,3265],{"className":3220,"style":3221},[150],"height:1.427em;",[69,3223,3224,3227],{"style":1917},[69,3225],{"className":3226,"style":1921},[157],[69,3228,3230,3233,3236,3239,3242,3245,3248,3251,3254],{"className":3229},[90],[69,3231,418],{"className":3232},[90,91],[69,3234,97],{"className":3235},[96],[69,3237,43],{"className":3238},[90,91],[69,3240,107],{"className":3241},[106],[69,3243],{"className":3244,"style":798},[111],[69,3246,418],{"className":3247},[90,91],[69,3249,97],{"className":3250},[96],[69,3252,415],{"className":3253},[90,91],[69,3255,107],{"className":3256},[106],[69,3258,3259,3262],{"style":1949},[69,3260],{"className":3261,"style":1921},[157],[69,3263],{"className":3264,"style":1957},[1956],[69,3266,3267,3270],{"style":1960},[69,3268],{"className":3269,"style":1921},[157],[69,3271,3273,3276,3279,3282],{"className":3272},[90],[69,3274,418],{"className":3275},[90,91],[69,3277,97],{"className":3278},[96],[69,3280,1579],{"className":3281},[90,91],[69,3283,107],{"className":3284},[106],[69,3286,785],{"className":3287},[784],[69,3289,3291],{"className":3290},[146],[69,3292,3295],{"className":3293,"style":3294},[150],"height:0.936em;",[69,3296],{},[69,3298],{"className":3299},[106,1900]," (PMI-like)",[385,3302,3303],{},"BERT",[367,3305,3306,3311,3314,3317],{},[385,3307,3308],{},[60,3309,3310],{},"Unigram LM",[385,3312,3313],{},"top-down prune",[385,3315,3316],{},"minimize corpus likelihood loss from removing a subword",[385,3318,3319],{},"T5, ALBERT",[3321,3322,3323,3345,3414],"ul",{},[3324,3325,3326,3328,3329,3344],"li",{},[60,3327,3144],{}," greedily merges the highest-count adjacent pair, ",[69,3330,3332],{"className":3331},[72],[69,3333,3335],{"className":3334,"ariaHidden":77},[76],[69,3336,3338,3341],{"className":3337},[81],[69,3339],{"className":3340,"style":2552},[85],[69,3342,1135],{"className":3343,"style":1134},[90,91]," times — simple and\ndeterministic.",[3324,3346,3347,3349,3350,3409,3410,188],{},[60,3348,3184],{}," (Schuster & Nakajima, 2012) instead merges the pair that most\nincreases training-corpus likelihood under a unigram model, i.e. the pair maximizing\nthe count ratio ",[69,3351,3353],{"className":3352},[72],[69,3354,3356],{"className":3355,"ariaHidden":77},[76],[69,3357,3359,3362,3365,3368,3371,3374,3378,3381,3384,3387,3390,3393,3396,3399,3402,3405],{"className":3358},[81],[69,3360],{"className":3361,"style":86},[85],[69,3363,418],{"className":3364},[90,91],[69,3366,97],{"className":3367},[96],[69,3369,1579],{"className":3370},[90,91],[69,3372,107],{"className":3373},[106],[69,3375,3377],{"className":3376},[90],"\u002F",[69,3379,97],{"className":3380},[96],[69,3382,418],{"className":3383},[90,91],[69,3385,97],{"className":3386},[96],[69,3388,43],{"className":3389},[90,91],[69,3391,107],{"className":3392},[106],[69,3394],{"className":3395,"style":798},[111],[69,3397,418],{"className":3398},[90,91],[69,3400,97],{"className":3401},[96],[69,3403,415],{"className":3404},[90,91],[69,3406,3408],{"className":3407},[106],"))"," — the same pointwise-mutual-information quantity\nused in the\n",[43,3411,3413],{"href":3412},"\u002Fnatural-language-processing\u002Fclassification\u002Fsentiment-and-affect-lexicons","sentiment lexicons",[3324,3415,3416,3419,3420,3428],{},[60,3417,3418],{},"Unigram-LM"," tokenization (Kudo, 2018) works top-down: fit a unigram distribution\nover a large candidate vocabulary, then iteratively prune the subwords whose removal\ncosts the corpus likelihood least.",[40,3421,3422],{},[43,3423,3427],{"href":3424,"ariaDescribedBy":3425,"dataFootnoteRef":6,"id":3426},"#user-content-fn-kudo",[47],"user-content-fnref-kudo","8"," It scores every segmentation and can retain\nseveral, enabling subword sampling during training.",[11,3430,1522,3431,3434,3435,3437],{},[60,3432,3433],{},"SentencePiece"," library (Kudo & Richardson, 2018) packages these so the\ntokenizer runs directly on raw text — treating the space as an ordinary symbol (often\nwritten as a visible underscore-like marker) — so the same tokenizer works on\nlanguages without spaces and the process is fully reversible from tokens back to the\nexact input string. The practical upshot: the ",[31,3436,2443],{}," that this lesson opened with is\nnot the unit modern models operate on. They operate on subwords chosen to balance a\nfixed vocabulary size against the ability to spell out anything, and the choice among\nBPE, WordPiece, and unigram-LM is a real engineering decision, not a detail.",[302,3439,3441],{"id":3440},"sentence-segmentation","Sentence segmentation",[11,3443,3444,3445,3448,3449,3451,3452,412,3455,412,3458,3460,3461,3463],{},"The last normalization task is ",[60,3446,3447],{},"sentence segmentation",": breaking text into\nsentences. Question marks and exclamation points are nearly unambiguous sentence\nboundaries. The period is the hard case, because ",[271,3450,188],{}," marks both an end of sentence\nand an abbreviation — ",[271,3453,3454],{},"Mr.",[271,3456,3457],{},"Inc.",[271,3459,2201],{}," — and sometimes both at once. Segmenters\ntherefore decide, per period, whether it belongs to the preceding token or ends the\nsentence, using an abbreviation dictionary (hand-built or learned) or a classifier.\nIn practice sentence and word tokenization are settled jointly: a sentence ends when\na sentence-final punctuation mark is ",[15,3462,358],{}," already glued into a token like an\nabbreviation or a number.",[3465,3466,3469,3474],"section",{"className":3467,"dataFootnotes":6},[3468],"footnotes",[52,3470,3473],{"className":3471,"id":47},[3472],"sr-only","Footnotes",[3475,3476,3477,3494,3505,3516,3527,3538,3549,3571],"ol",{},[3324,3478,3480,412,3483,3486,3487],{"id":3479},"user-content-fn-jm-eliza",[60,3481,3482],{},"Jurafsky & Martin",[15,3484,3485],{},"Speech and Language Processing"," (3rd ed.), Ch. 2 — ELIZA as a cascade of regular-expression substitutions, the earliest pattern-based dialogue system. ",[43,3488,3493],{"href":3489,"ariaLabel":3490,"className":3491,"dataFootnoteBackref":6},"#user-content-fnref-jm-eliza","Back to reference 1",[3492],"data-footnote-backref","↩",[3324,3495,3497,3499,3500],{"id":3496},"user-content-fn-jm-re",[60,3498,3482],{},", §2.1 — Regular Expressions: character classes, ranges, negation, Kleene star and plus, anchors, disjunction, grouping, capture groups, substitution, and lookahead. ",[43,3501,3493],{"href":3502,"ariaLabel":3503,"className":3504,"dataFootnoteBackref":6},"#user-content-fnref-jm-re","Back to reference 2",[3492],[3324,3506,3508,3510,3511],{"id":3507},"user-content-fn-jm-precision",[60,3509,3482],{},", §2.1.3 — false positives and false negatives, and the precision\u002Frecall tradeoff that governs pattern design. ",[43,3512,3493],{"href":3513,"ariaLabel":3514,"className":3515,"dataFootnoteBackref":6},"#user-content-fnref-jm-precision","Back to reference 3",[3492],[3324,3517,3519,3521,3522],{"id":3518},"user-content-fn-jm-norm",[60,3520,3482],{},", §2.4 — Text Normalization: the three standard steps of tokenizing words, normalizing word formats, and segmenting sentences. ",[43,3523,3493],{"href":3524,"ariaLabel":3525,"className":3526,"dataFootnoteBackref":6},"#user-content-fnref-jm-norm","Back to reference 4",[3492],[3324,3528,3530,3532,3533],{"id":3529},"user-content-fn-jm-bpe",[60,3531,3482],{},", §2.4.3 — Byte-Pair Encoding: the unknown-word problem, subword tokenization, and the token-learner \u002F token-segmenter split, with the low\u002Fnewer\u002Fwider worked corpus. ",[43,3534,3493],{"href":3535,"ariaLabel":3536,"className":3537,"dataFootnoteBackref":6},"#user-content-fnref-jm-bpe","Back to reference 5",[3492],[3324,3539,3541,3543,3544],{"id":3540},"user-content-fn-jm-porter",[60,3542,3482],{},", §2.4.4 — Word Normalization, Lemmatization and Stemming: morphological parsing into stems and affixes, the Porter stemmer's cascade of rewrite rules, and its over- and under-generalization errors. ",[43,3545,3493],{"href":3546,"ariaLabel":3547,"className":3548,"dataFootnoteBackref":6},"#user-content-fnref-jm-porter","Back to reference 6",[3492],[3324,3550,3552,412,3555,67,3558,3561,3562,3565,3566],{"id":3551},"user-content-fn-sennrich",[60,3553,3554],{},"R. Sennrich, B. Haddow, A. Birch",[31,3556,3557],{},"Neural Machine Translation of Rare Words with Subword Units,",[15,3559,3560],{},"Proceedings of ACL",", 2016 — reintroduces byte-pair encoding (originally Gage, ",[31,3563,3564],{},"A New Algorithm for Data Compression,"," 1994) as an open-vocabulary tokenization for neural MT, improving translation of rare and unseen words by spelling them from subword units in a single fixed vocabulary. ",[43,3567,3493],{"href":3568,"ariaLabel":3569,"className":3570,"dataFootnoteBackref":6},"#user-content-fnref-sennrich","Back to reference 7",[3492],[3324,3572,3574,412,3577,67,3580,3582,3583,67,3586,3589,3590,67,3593,3596,3597],{"id":3573},"user-content-fn-kudo",[60,3575,3576],{},"T. Kudo",[31,3578,3579],{},"Subword Regularization: Improving Neural Network Translation Models with Multiple Subword Candidates,",[15,3581,3560],{},", 2018 — the unigram-language-model tokenizer, which fits a unigram distribution over a candidate subword vocabulary and prunes by likelihood, and can sample among segmentations; packaged with BPE in T. Kudo & J. Richardson, ",[31,3584,3585],{},"SentencePiece,",[15,3587,3588],{},"EMNLP (system demonstrations)",", 2018. WordPiece is M. Schuster & K. Nakajima, ",[31,3591,3592],{},"Japanese and Korean voice search,",[15,3594,3595],{},"ICASSP",", 2012. ",[43,3598,3493],{"href":3599,"ariaLabel":3600,"className":3601,"dataFootnoteBackref":6},"#user-content-fnref-kudo","Back to reference 8",[3492],[3603,3604,3605],"style",{},"html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark-mode .shiki span {color: var(--shiki-dark-mode);background: var(--shiki-dark-mode-bg);font-style: var(--shiki-dark-mode-font-style);font-weight: var(--shiki-dark-mode-font-weight);text-decoration: var(--shiki-dark-mode-text-decoration);}html.dark-mode .shiki span {color: var(--shiki-dark-mode);background: var(--shiki-dark-mode-bg);font-style: var(--shiki-dark-mode-font-style);font-weight: var(--shiki-dark-mode-font-weight);text-decoration: var(--shiki-dark-mode-text-decoration);}",{"title":6,"searchDepth":2648,"depth":2648,"links":3607},[3608,3613,3620],{"id":54,"depth":2648,"text":55,"children":3609},[3610,3611,3612],{"id":304,"depth":2654,"text":305},{"id":540,"depth":2654,"text":541},{"id":1466,"depth":2654,"text":1467},{"id":2157,"depth":2648,"text":2158,"children":3614},[3615,3616,3617,3618,3619],{"id":2188,"depth":2654,"text":2189},{"id":2447,"depth":2654,"text":2448},{"id":2844,"depth":2654,"text":2845},{"id":3067,"depth":2654,"text":3068},{"id":3440,"depth":2654,"text":3441},{"id":47,"depth":2648,"text":3473},[],"computer-science","Every language-processing system takes the same input: a stream of characters. Few\ndownstream operations are defined on characters — they need words, sentences, prices,\nor a distance between two strings. This lesson supplies three layers between the\ncharacter stream and the first model: a pattern language for finding structure\n(regular expressions), a set of tasks for imposing structure (text normalization),\nand one algorithm for comparing strings (minimum edit distance).",false,"md",{"moduleNumber":2642,"lessonNumber":2648,"order":3627},102,"Foundations",true,"\u002Fnatural-language-processing\u002Ffoundations\u002Fregex-and-text-normalization",[],"---\ntitle: Regular Expressions and Text Normalization\nmodule: Foundations\nmoduleNumber: 1\nlessonNumber: 2\norder: 102\nsummary: >\n  Before any model touches text, the text has to be found and cleaned. Regular\n  expressions give an algebra for describing string patterns; tokenization,\n  case folding, and stemming turn raw characters into the units a model counts;\n  and byte-pair encoding builds a subword vocabulary that spells out any word.\n  Measuring how far apart two strings are — minimum edit distance — is the\n  next lesson.\ntopics: [Foundations]\nsources:\n  - book: Jurafsky & Martin\n    ref: \"Ch. 2 — Regular Expressions, Text Normalization, Edit Distance; §2.1 Regular Expressions\"\n  - book: Jurafsky & Martin\n    ref: \"§2.4 Text Normalization\"\n---\n\nEvery language-processing system takes the same input: a stream of characters. Few\ndownstream operations are defined on characters — they need words, sentences, prices,\nor a distance between two strings. This lesson supplies three layers between the\ncharacter stream and the first model: a pattern language for _finding_ structure\n(regular expressions), a set of tasks for _imposing_ structure (text normalization),\nand one algorithm for _comparing_ strings (minimum edit distance).\n\nWeizenbaum's ELIZA, the earliest dialogue system, was a cascade of\npattern-and-substitute rules — mapping \"I need X\" to \"What would it mean to you if you\ngot X?\" — and nothing more.[^jm-eliza] The pattern-matching layer persists in modern\nsystems as the entry point where text enters the pipeline.\n\n## Regular expressions\n\nA **regular expression** (RE) is an algebraic notation characterizing a set of\nstrings — a **regular language** $L(r) \\subseteq \\Sigma^\\ast$ over an alphabet\n$\\Sigma$.[^jm-re] Given a **pattern** and a **corpus** of text, an engine returns\nevery substring $w$ with $w \\in L(r)$. Every RE compiles to an equivalent\nfinite-state automaton, which is why matching runs in time linear in the input. The\nnotation is portable across `grep`, editors, and Python; patterns are written between\nslash delimiters, `\u002Flike this\u002F` (the slashes are not part of the pattern).\n\nThe simplest pattern is a literal sequence of characters: `\u002Fwoodchuck\u002F` matches the\nstring `woodchuck` wherever it appears. Regular expressions are **case sensitive**,\nso `\u002Fwoodchuck\u002F` will not match `Woodchuck`. Everything past literals is built from\na small set of operators that let one pattern stand for many strings.\n\n### Character classes, ranges, and negation\n\nSquare brackets specify a **disjunction of characters** — a single position that may\nbe any one of a set. `\u002F[wW]\u002F` matches `w` or `W`, so `\u002F[wW]oodchuck\u002F` catches both\ncapitalizations. Inside brackets a dash denotes a **range** over the character\nordering: `\u002F[a-z]\u002F` is any lowercase letter, `\u002F[A-Z]\u002F` any uppercase letter,\n`\u002F[0-9]\u002F` any single digit. A caret as the _first_ character inside the brackets\n**negates** the class: `\u002F[^a-z]\u002F` matches any single character that is _not_ a\nlowercase letter. (A caret anywhere else inside brackets is just a literal caret.)\n\n| Pattern | Matches | Example |\n| --- | --- | --- |\n| `\u002F[wW]\u002F` | `w` or `W` | **W**oodchuck |\n| `\u002F[abc]\u002F` | one of `a`, `b`, `c` | in uomini, in sold**a**ti |\n| `\u002F[0-9]\u002F` | a single digit | Chapter **1** |\n| `\u002F[A-Z]\u002F` | an uppercase letter | **D**renched Blossoms |\n| `\u002F[^A-Z]\u002F` | any non-uppercase char | O**y**fn pripetchik |\n| `\u002F[^Ss]\u002F` | neither `S` nor `s` | **I** have no reason |\n\nBecause a handful of classes come up constantly, there are backslash **aliases**:\n`\\d` is `[0-9]`, `\\w` is a word character `[a-zA-Z0-9_]`, `\\s` is whitespace, and\neach has an uppercase-negated twin (`\\D`, `\\W`, `\\S`). To match a character that is\nitself an operator — a literal period, star, or bracket — precede it with a\nbackslash: `\u002F\\.\u002F`, `\u002F\\*\u002F`, `\u002F\\[\u002F`.\n\n### Counters — optionality, Kleene star and plus\n\nA **counter** following an element sets its multiplicity. For an element $e$, the\ncounters denote:\n\n| Counter | Repetitions of $e$ | Language |\n| --- | --- | --- |\n| `e?` | $0$ or $1$ | $\\{\\varepsilon\\} \\cup L(e)$ |\n| `e*` | $0$ or more (Kleene star) | $\\bigcup_{n\\ge 0} L(e)^n$ |\n| `e+` | $1$ or more (Kleene plus) | $\\bigcup_{n\\ge 1} L(e)^n$ |\n| `e{n}` | exactly $n$ | $L(e)^n$ |\n| `e{n,m}` | between $n$ and $m$ | $\\bigcup_{k=n}^{m} L(e)^k$ |\n| `e{n,}` | at least $n$ | $\\bigcup_{k\\ge n} L(e)^k$ |\n\nSo `\u002Fcolou?r\u002F` matches `color` and `colour`; `\u002Fa*\u002F` matches $\\varepsilon, a, aa,\n\\dots$; and `\u002F[0-9]+\u002F` is the idiom for an integer. The wildcard `\u002F.\u002F` (an\nunescaped period) matches any single character, so `\u002Fbeg.n\u002F` matches `begin`,\n`begun`, and `beg'n` alike, and `\u002Faardvark.*aardvark\u002F` matches any line where\n`aardvark` appears twice.\n\nThe star is **greedy**: against `once upon a time`, `\u002F[a-z]*\u002F` matches the longest\nprefix run. The non-greedy variants `*?` and `+?` match the _fewest_ characters\npossible, which matters when a later subpattern must consume the remainder.\n\n### Anchors, disjunction, and grouping\n\n**Anchors** match a _position_ rather than a character. The caret `^` (outside\nbrackets) matches the start of a line, `$` matches the end, `\\b` matches a word\nboundary, and `\\B` a non-boundary. So `\u002F^The\u002F` finds `The` only at the start of a\nline, and `\u002F\\bthe\\b\u002F` matches the word `the` but not `the` buried inside `other` or\n`theology`.\n\nThe **disjunction** operator `|` (the pipe) matches either of two whole patterns:\n`\u002Fcat|dog\u002F` matches `cat` or `dog`. Disjunction has very low precedence — it splits\nthe pattern at the widest scope — so `\u002Fguppy|ies\u002F` matches `guppy` or `ies`, _not_\n`guppy` or `guppies`. To scope the disjunction, use **grouping** parentheses:\n`\u002Fgupp(y|ies)\u002F` matches `guppy` and `guppies`, because the parentheses make\n`(y|ies)` behave as a single element. Grouping also lets a counter apply to a whole\nsub-pattern rather than one character: `\u002F(ab)+\u002F` matches `ab`, `abab`, `ababab`.\n\nParentheses have a second job. A **capture group** stores whatever its sub-pattern\nmatched in a numbered **register**, referred to later by `\\1`, `\\2`, and so on. This\nmakes substitutions expressive: the substitution `s\u002F([0-9]+)\u002F\u003C\\1>\u002F` wraps every\ninteger in angle brackets, and `\u002Fthe (.*)er they were, the \\1er they will be\u002F`\nforces the two blanks to match the _same_ string, so it accepts \"the bigger they\nwere, the bigger they will be\" but rejects a mismatched pair. When you want the\ngrouping but not the register, a **non-capturing group** `(?:...)` groups without\nconsuming a register number.\n\nThe precedence order, highest to lowest, is the one fact that resolves most\nambiguous patterns:\n\n| Precedence | Operators | Example |\n| --- | --- | --- |\n| highest | parentheses | `(...)` |\n| | counters | `* + ? {n,m}` |\n| | sequences and anchors | `the`, `^my`, `end$` |\n| lowest | disjunction | `\\|` |\n\nBecause counters bind tighter than sequences, `\u002Fthe*\u002F` matches `th`, `the`, `thee`,\n`theee` — the star attaches to `e`, not to the whole word. Because sequences bind\ntighter than disjunction, `\u002Fthe|any\u002F` matches `the` or `any`, not `th` followed by\n`e`-or-`a` followed by `ny`.\n\n$$\n% caption: The regular-expression operator precedence hierarchy: parentheses bind\n% tightest, then counters, then sequences and anchors, and disjunction loosest —\n% the order that resolves an otherwise ambiguous pattern.\n\\begin{tikzpicture}[>=stealth, font=\\footnotesize,\n  lvl\u002F.style={draw, minimum width=44mm, minimum height=9mm, align=center, font=\\footnotesize}]\n  \\definecolor{acc}{HTML}{2348F2}\n  \\node[lvl, draw=acc, text=acc, thick] (a) at (0,3.0)  {parentheses \\texttt{(...)}};\n  \\node[lvl] (b) at (0,1.8)  {counters \\texttt{*} \\texttt{+} \\texttt{?} \\texttt{n..m}};\n  \\node[lvl] (c) at (0,0.6)  {sequences, anchors};\n  \\node[lvl] (d) at (0,-0.6) {disjunction (pipe)};\n  \\draw[->, black] (a) -- (b);\n  \\draw[->, black] (b) -- (c);\n  \\draw[->, black] (c) -- (d);\n  \\node[anchor=west, font=\\footnotesize, text=acc] at (2.9,3.0)  {binds tightest};\n  \\node[anchor=west, font=\\footnotesize, text=black] at (2.9,-0.6) {binds loosest};\n\\end{tikzpicture}\n$$\n\nTwo more operators round out the language. **Substitution**, written\n`s\u002Fpattern\u002Freplacement\u002F`, rewrites every match — `s\u002Fcolour\u002Fcolor\u002F` Americanizes a\ndocument. **Lookahead assertions** test whether a pattern matches _without_\nconsuming any input: `(?=...)` is positive lookahead, `(?!...)` negative, both\nzero-width. Negative lookahead expresses exclusions cleanly — `\u002F^(?!Volcano)[A-Za-z]+\u002F`\nmatches any opening word that is not `Volcano`.\n\nPattern design balances two error types. A loose pattern produces **false positives**\n($\\mathrm{FP}$, matching excluded strings); a tight pattern produces **false\nnegatives** ($\\mathrm{FN}$, missing intended strings). With true positives\n$\\mathrm{TP}$,\n\n$$\n\\text{precision} = \\frac{\\mathrm{TP}}{\\mathrm{TP} + \\mathrm{FP}}, \\qquad\n\\text{recall} = \\frac{\\mathrm{TP}}{\\mathrm{TP} + \\mathrm{FN}}.\n$$\n\nTightening to cut $\\mathrm{FP}$ raises precision; loosening to cut $\\mathrm{FN}$\nraises recall. Every pattern trades one against the other.[^jm-precision]\n\n## Text normalization\n\nBefore almost any language processing, the text must be **normalized** into a\nstandard form. Three tasks make up nearly every normalization pipeline: **tokenizing**\nwords, **normalizing** word formats, and **segmenting** sentences.[^jm-norm]\n\n### Tokenization\n\n**Tokenization** is the task of segmenting running text into words, or **tokens**.\nThe naive rule — split on whitespace — fails immediately, in both directions. It\nsplits too little: `Ph.D.`, `AT&T`, and `m.p.h.` contain internal punctuation that\nbelongs to the token, and prices like `$45.55` or dates like `01\u002F02\u002F06` must not be\ndiced at the period. It also splits too much: `New York` and `rock 'n' roll` are\narguably single tokens despite their spaces, and a **clitic** contraction like\n`what're` should expand to the two tokens `what` and `are`. Punctuation itself is\nusually worth keeping as its own token — commas cue parsers, periods cue sentence\nboundaries, question marks carry meaning — rather than discarded.\n\nTokenization runs first, so it must be fast: the standard approach compiles a\ndeterministic RE into a finite-state automaton. The **Penn Treebank** standard\nseparates clitics (`doesn't` → `does` `n't`), keeps hyphenated words together, and\nsplits off punctuation. Two counts recur throughout the subject: the number of\ndistinct words, the **types** or vocabulary size $|V|$, and the total number of\nrunning words, the **tokens** $N$. Empirically the two grow together as $|V| \\propto\nN^{\\beta}$ with $\\beta \\approx 0.67$–$0.75$ (Herdan's law), so vocabulary keeps\nexpanding with corpus size.\n\nNot every language separates words with spaces. Chinese writes characters (**hanzi**)\nwith no delimiters, and boundary judgments disagree even among native speakers; many\nChinese tasks take each character as the token. Japanese and Thai require dedicated\n**word-segmentation** models. These difficulties motivate a third option that\nsidesteps the definition of a \"word\" altogether.\n\n### Byte-pair encoding\n\nWords are a leaky abstraction for a model. A system trained on `low`, `new`, and\n`newer` but never `lower` cannot represent `lower` at test time — the **unknown-word**\n(out-of-vocabulary) problem. Modern tokenizers avoid it with a vocabulary of\n**subwords**: units smaller than words, often morphemes like `-er` or `-est`, so any\nunseen word is spelled from known pieces.[^jm-bpe]\n\nThe dominant scheme is **byte-pair encoding** (BPE), in two halves: a _token learner_\ninducing a vocabulary $V$ from a corpus, and a _token segmenter_ applying it to new\ntext. The learner initializes $V$ to the character set, then for $k$ iterations\nselects the most frequent adjacent symbol pair, merges it into a new symbol, and adds\nit to $V$. This yields $|V| = |\\Sigma| + k$.\n\n```algorithm\ncaption: $\\textsc{Byte-Pair-Encoding}(C, k)$ — learn a subword vocabulary from corpus $C$ with $k$ merges\ninput: corpus $C$ (words as character sequences with a word-end marker), number of merges $k$\n$V \\gets$ set of all distinct characters in $C$\nfor $i = 1$ to $k$ do\n  $(t_L, t_R) \\gets$ most frequent adjacent pair of symbols in $C$\n  $t_{\\text{new}} \\gets t_L + t_R$ \u002F\u002F concatenate into one new symbol\n  $V \\gets V \\cup \\{t_{\\text{new}}\\}$\n  replace every occurrence of $(t_L, t_R)$ in $C$ with $t_{\\text{new}}$\nreturn $V$\n```\n\nRun inside words with a special end-of-word marker `_`, on a tiny corpus of counted\nword tokens (`low` × 5, `lowest` × 2, `newer` × 6, `wider` × 3, `new` × 2), the\nfirst merges are easy to trace by hand. The pair `e r` is most frequent (9\noccurrences, across `newer` and `wider`), so it merges to `er`; then `er _` merges\nto `er_`; then `n e` to `ne`, and so on.\n\n$$\n% caption: The first three BPE merges on the corpus low\u002Flowest\u002Fnewer\u002Fwider\u002Fnew.\n% The most frequent adjacent pair is merged into a single symbol, added to the\n% vocabulary, and rewritten throughout the corpus, then the count repeats.\n\\begin{tikzpicture}[>=stealth, font=\\footnotesize,\n  box\u002F.style={draw, minimum width=30mm, minimum height=8mm, align=center, font=\\footnotesize}]\n  \\definecolor{acc}{HTML}{2348F2}\n  \\node[box] (s0) at (0,3.2) {\\texttt{e r} (count 9)};\n  \\node[box] (s1) at (0,1.6) {\\texttt{er \\_} (count 9)};\n  \\node[box] (s2) at (0,0.0) {\\texttt{n e} (count 8)};\n  \\node[box, draw=acc, text=acc, thick] (v0) at (5.4,3.2) {add \\texttt{er}};\n  \\node[box, draw=acc, text=acc, thick] (v1) at (5.4,1.6) {add \\texttt{er\\_}};\n  \\node[box, draw=acc, text=acc, thick] (v2) at (5.4,0.0) {add \\texttt{ne}};\n  \\draw[->, acc, thick] (s0) -- (v0) node[midway, above, font=\\scriptsize] {merge};\n  \\draw[->, acc, thick] (s1) -- (v1) node[midway, above, font=\\scriptsize] {merge};\n  \\draw[->, acc, thick] (s2) -- (v2) node[midway, above, font=\\scriptsize] {merge};\n  \\draw[->, black] (v0.south) .. controls (5.4,2.6) and (0,2.4) .. (s1.north);\n  \\node[font=\\scriptsize, text=black, anchor=south] at (3.2,2.62) {recount};\n  \\draw[->, black] (v1.south) .. controls (5.4,1.0) and (0,0.8) .. (s2.north);\n  \\node[font=\\scriptsize, text=black, anchor=south] at (3.2,1.02) {recount};\n\\end{tikzpicture}\n$$\n\nThe segmenter applies the learned merges, in the order learned, to new text. A word\nseen in training collapses back to a few symbols; a genuinely novel word like\n`lower` is left as the pieces `low` and `er_`. With thousands of merges on a real\ncorpus the effect is that common words become single tokens and only the rare and\nunknown ones get spelled out of parts — exactly the behavior a language model needs.\n\nTo see the segmenter run, take the learned merge list (in order) `e r` → `er`,\n`er _` → `er_`, `n e` → `ne`, `ne w` → `new`, `l o` → `lo`, `lo w` → `low`, and\napply it to the unseen word `lower_`. Start from characters, `l o w e r _`, and scan\nfor the first applicable merge in learned order. `e r` fires, giving `l o w er _`;\nthen `er _` fires, giving `l o w er_`; `n e` and `ne w` do not apply; `l o` fires,\ngiving `lo w er_`; `lo w` fires, giving `low er_`. No further merge applies, so\n`lower_` segments as `low` + `er_` — two known pieces the model has embeddings for,\neven though `lower` never appeared in training. The unknown-word problem is dissolved:\nthere is no out-of-vocabulary word, only a longer or shorter spelling out of subwords.\n\n$$\n% caption: Segmenting the unseen word lower with the learned merge list. Starting\n% from characters, each learned merge is applied in order where it fits; the word\n% ends as low + er, two in-vocabulary pieces, with no unknown token.\n\\begin{tikzpicture}[>=stealth, font=\\footnotesize,\n  row\u002F.style={font=\\footnotesize\\ttfamily, anchor=west},\n  op\u002F.style={font=\\scriptsize, text=black, anchor=west}]\n  \\definecolor{acc}{HTML}{2348F2}\n  \\node[row] at (0,3.0)  {l o w e r \\_};\n  \\node[op]  at (4.4,3.0) {start: characters};\n  \\node[row] at (0,2.2)  {l o w er \\_};\n  \\node[op]  at (4.4,2.2) {apply e+r};\n  \\node[row] at (0,1.4)  {l o w er\\_};\n  \\node[op]  at (4.4,1.4) {apply er+\\_};\n  \\node[row] at (0,0.6)  {lo w er\\_};\n  \\node[op]  at (4.4,0.6) {apply l+o};\n  \\node[row, text=acc] at (0,-0.2) {low er\\_};\n  \\node[op]  at (4.4,-0.2) {apply lo+w, done};\n  \\draw[->, acc] (1.4,2.82) -- (1.4,2.38);\n  \\draw[->, acc] (1.4,2.02) -- (1.4,1.58);\n  \\draw[->, acc] (1.4,1.22) -- (1.4,0.78);\n  \\draw[->, acc] (1.4,0.42) -- (1.4,-0.02);\n\\end{tikzpicture}\n$$\n\n### Word normalization, lemmatization, and stemming\n\nEven after tokenizing, the same word appears in many surface forms. **Word normalization** puts\ntokens into a standard form: mapping `US`, `U.S.`, and `USA` to one representation,\nor collapsing `uh-huh` and `uhhuh`. **Case folding** — mapping everything to\nlowercase — is the bluntest version, and it helps for information retrieval, where a\nsearcher wants `Woodchuck` and `woodchuck` treated alike. But case folding is not\nalways wanted: for sentiment analysis and machine translation the difference between\n`US` the country and `us` the pronoun can outweigh the generalization it buys.\n\nA deeper normalization collapses inflected forms. **Lemmatization** determines that\ntwo words share a root despite surface differences: `am`, `are`, and `is` all reduce\nto the **lemma** `be`; `dinner` and `dinners` to `dinner`. Done properly it requires\n**morphological parsing** — decomposing a word into its **morphemes**, the smallest\nmeaning-bearing units, split into **stems** (the core meaning) and **affixes** (the\n`-s`, `-ed`, `-ing` that modify it). Lemmatizing \"He is reading detective stories\"\nyields \"He be read detective story.\"\n\nFull morphological parsing is expensive; **stemming** is the cheaper shortcut,\nchopping affixes off the word end. The **Porter stemmer** is the classic instance: a\ncascade of rewrite rules applied in series, each pass feeding the next.[^jm-porter] A\nsampling of its rules:\n\n| Rule | Example |\n| --- | --- |\n| `ATIONAL` → `ATE` | relational → relate |\n| `ING` → $\\varepsilon$ (if stem has a vowel) | motoring → motor |\n| `SSES` → `SS` | grasses → grass |\n\nStemming is fast and dictionary-free, but it errs in both directions — **over-generalizing**\n(`organization` → `organ`, `policy` → `police`) and **under-generalizing** (`European`\nand `Europe` left unmerged). It is a useful approximation, not a substitute for real\nmorphology.\n\n### The subword tokenizers behind modern models\n\nThe byte-pair encoding above was introduced for text _compression_ (Gage, 1994); its\nadaptation to NLP is more recent and is worth stating precisely, because the exact\ntokenizer a model uses shapes what it can represent. Sennrich, Haddow & Birch (2016,\nACL) reintroduced BPE as a tokenization method for neural machine translation, and\ntheir motivation was the same open-vocabulary problem the previous section named:\na translation model with a fixed word vocabulary cannot emit a word it never saw,\nand it is the rare words — names, compounds, morphologically rich forms — that\nmatter most.[^sennrich] Splitting into subword units let a single fixed-size\nvocabulary spell out any word, and it improved translation of rare and unseen words.\nThat paper is why nearly every transformer since tokenizes into subwords.\n\nThree variants dominate, differing in the merge or split criterion.\n\n| Tokenizer | Direction | Criterion for a pair $(a,b)$ | Used by |\n| --- | --- | --- | --- |\n| **BPE** | bottom-up merge | maximize count $c(ab)$ | GPT-2, GPT-3 |\n| **WordPiece** | bottom-up merge | maximize $\\dfrac{c(ab)}{c(a)\\,c(b)}$ (PMI-like) | BERT |\n| **Unigram LM** | top-down prune | minimize corpus likelihood loss from removing a subword | T5, ALBERT |\n\n- **BPE** greedily merges the highest-count adjacent pair, $k$ times — simple and\n  deterministic.\n- **WordPiece** (Schuster & Nakajima, 2012) instead merges the pair that most\n  increases training-corpus likelihood under a unigram model, i.e. the pair maximizing\n  the count ratio $c(ab)\u002F(c(a)\\,c(b))$ — the same pointwise-mutual-information quantity\n  used in the\n  [sentiment lexicons](\u002Fnatural-language-processing\u002Fclassification\u002Fsentiment-and-affect-lexicons).\n- **Unigram-LM** tokenization (Kudo, 2018) works top-down: fit a unigram distribution\n  over a large candidate vocabulary, then iteratively prune the subwords whose removal\n  costs the corpus likelihood least.[^kudo] It scores every segmentation and can retain\n  several, enabling subword sampling during training.\n\nThe **SentencePiece** library (Kudo & Richardson, 2018) packages these so the\ntokenizer runs directly on raw text — treating the space as an ordinary symbol (often\nwritten as a visible underscore-like marker) — so the same tokenizer works on\nlanguages without spaces and the process is fully reversible from tokens back to the\nexact input string. The practical upshot: the \"word\" that this lesson opened with is\nnot the unit modern models operate on. They operate on subwords chosen to balance a\nfixed vocabulary size against the ability to spell out anything, and the choice among\nBPE, WordPiece, and unigram-LM is a real engineering decision, not a detail.\n\n### Sentence segmentation\n\nThe last normalization task is **sentence segmentation**: breaking text into\nsentences. Question marks and exclamation points are nearly unambiguous sentence\nboundaries. The period is the hard case, because `.` marks both an end of sentence\nand an abbreviation — `Mr.`, `Inc.`, `Ph.D.` — and sometimes both at once. Segmenters\ntherefore decide, per period, whether it belongs to the preceding token or ends the\nsentence, using an abbreviation dictionary (hand-built or learned) or a classifier.\nIn practice sentence and word tokenization are settled jointly: a sentence ends when\na sentence-final punctuation mark is _not_ already glued into a token like an\nabbreviation or a number.\n\n[^jm-eliza]: **Jurafsky & Martin**, _Speech and Language Processing_ (3rd ed.), Ch. 2 — ELIZA as a cascade of regular-expression substitutions, the earliest pattern-based dialogue system.\n[^jm-re]: **Jurafsky & Martin**, §2.1 — Regular Expressions: character classes, ranges, negation, Kleene star and plus, anchors, disjunction, grouping, capture groups, substitution, and lookahead.\n[^jm-precision]: **Jurafsky & Martin**, §2.1.3 — false positives and false negatives, and the precision\u002Frecall tradeoff that governs pattern design.\n[^jm-norm]: **Jurafsky & Martin**, §2.4 — Text Normalization: the three standard steps of tokenizing words, normalizing word formats, and segmenting sentences.\n[^jm-bpe]: **Jurafsky & Martin**, §2.4.3 — Byte-Pair Encoding: the unknown-word problem, subword tokenization, and the token-learner \u002F token-segmenter split, with the low\u002Fnewer\u002Fwider worked corpus.\n[^jm-porter]: **Jurafsky & Martin**, §2.4.4 — Word Normalization, Lemmatization and Stemming: morphological parsing into stems and affixes, the Porter stemmer's cascade of rewrite rules, and its over- and under-generalization errors.\n[^sennrich]: **R. Sennrich, B. Haddow, A. Birch**, \"Neural Machine Translation of Rare Words with Subword Units,\" _Proceedings of ACL_, 2016 — reintroduces byte-pair encoding (originally Gage, \"A New Algorithm for Data Compression,\" 1994) as an open-vocabulary tokenization for neural MT, improving translation of rare and unseen words by spelling them from subword units in a single fixed vocabulary.\n[^kudo]: **T. Kudo**, \"Subword Regularization: Improving Neural Network Translation Models with Multiple Subword Candidates,\" _Proceedings of ACL_, 2018 — the unigram-language-model tokenizer, which fits a unigram distribution over a candidate subword vocabulary and prunes by likelihood, and can sample among segmentations; packaged with BPE in T. Kudo & J. Richardson, \"SentencePiece,\" _EMNLP (system demonstrations)_, 2018. WordPiece is M. Schuster & K. Nakajima, \"Japanese and Korean voice search,\" _ICASSP_, 2012.\n",{"text":3634,"minutes":3635,"time":3636,"words":3637},"13 min read",12.475,748500,2495,{"title":5,"description":3623},[3640,3642],{"book":3482,"ref":3641},"Ch. 2 — Regular Expressions, Text Normalization, Edit Distance; §2.1 Regular Expressions",{"book":3482,"ref":3643},"§2.4 Text Normalization","available","09.natural-language-processing\u002F01.foundations\u002F02.regex-and-text-normalization","Before any model touches text, the text has to be found and cleaned. Regular expressions give an algebra for describing string patterns; tokenization, case folding, and stemming turn raw characters into the units a model counts; and byte-pair encoding builds a subword vocabulary that spells out any word. Measuring how far apart two strings are — minimum edit distance — is the next lesson.\n",[3628],"4tfyjgWnfHeVaJzPq6_-rHiEOdFJRw68woYUpQNLRHU",{"\u002Falgorithms\u002Ffoundations\u002Fwhat-is-an-algorithm":3650,"\u002Falgorithms\u002Ffoundations\u002Fproof-techniques":3651,"\u002Falgorithms\u002Ffoundations\u002Fasymptotic-analysis":3652,"\u002Falgorithms\u002Ffoundations\u002Fgrowth-rates-and-loop-analysis":3653,"\u002Falgorithms\u002Ffoundations\u002Frecurrences":3654,"\u002Falgorithms\u002Ffoundations\u002Famortized-analysis":3655,"\u002Falgorithms\u002Fdivide-and-conquer\u002Fmergesort":3656,"\u002Falgorithms\u002Fdivide-and-conquer\u002Fquicksort":3657,"\u002Falgorithms\u002Fdivide-and-conquer\u002Fselection":3658,"\u002Falgorithms\u002Fdivide-and-conquer\u002Ffast-multiplication":3659,"\u002Falgorithms\u002Fsorting\u002Fheaps-and-heapsort":3660,"\u002Falgorithms\u002Fsorting\u002Fsorting-lower-bounds":3661,"\u002Falgorithms\u002Fsorting\u002Flinear-time-sorting":3662,"\u002Falgorithms\u002Fsorting\u002Fexternal-sorting":3663,"\u002Falgorithms\u002Fdata-structures\u002Felementary-structures":3664,"\u002Falgorithms\u002Fdata-structures\u002Fhash-tables":3665,"\u002Falgorithms\u002Fdata-structures\u002Fbinary-search-trees":3666,"\u002Falgorithms\u002Fdata-structures\u002Favl-trees":3667,"\u002Falgorithms\u002Fdata-structures\u002Fbalanced-trees":3668,"\u002Falgorithms\u002Fdata-structures\u002Funion-find":3669,"\u002Falgorithms\u002Fdata-structures\u002Ffenwick-and-segment-trees":3670,"\u002Falgorithms\u002Fdata-structures\u002Fspatial-data-structures":3671,"\u002Falgorithms\u002Fdata-structures\u002Fskip-lists-and-probabilistic-structures":3672,"\u002Falgorithms\u002Fdata-structures\u002Fb-trees":3673,"\u002Falgorithms\u002Fdata-structures\u002Fdata-stream-algorithms":3674,"\u002Falgorithms\u002Fdata-structures\u002Fstreaming-sketches":3675,"\u002Falgorithms\u002Fsequences\u002Ftwo-pointers-and-windows":3676,"\u002Falgorithms\u002Fsequences\u002Fprefix-sums":3677,"\u002Falgorithms\u002Fsequences\u002Fmonotonic-stacks":3678,"\u002Falgorithms\u002Fsequences\u002Fbinary-search-on-the-answer":3679,"\u002Falgorithms\u002Fsequences\u002Fstring-matching":3680,"\u002Falgorithms\u002Fsequences\u002Fkmp-and-z-function":3681,"\u002Falgorithms\u002Fsequences\u002Ftries":3682,"\u002Falgorithms\u002Fsequences\u002Fsuffix-arrays-and-aho-corasick":3683,"\u002Falgorithms\u002Fgraphs\u002Frepresentations-and-traversal":3684,"\u002Falgorithms\u002Fgraphs\u002Fdepth-first-search":3685,"\u002Falgorithms\u002Fgraphs\u002Ftopological-sort-and-scc":3686,"\u002Falgorithms\u002Fgraphs\u002Fminimum-spanning-trees":3687,"\u002Falgorithms\u002Fgraphs\u002Fkruskal-and-prim":3688,"\u002Falgorithms\u002Fgraphs\u002Fshortest-paths":3689,"\u002Falgorithms\u002Fgraphs\u002Fall-pairs-and-negative-weights":3690,"\u002Falgorithms\u002Fgraphs\u002Fnetwork-flow":3691,"\u002Falgorithms\u002Fgraphs\u002Fmax-flow-min-cut":3692,"\u002Falgorithms\u002Fgraphs\u002Fbridges-and-articulation-points":3693,"\u002Falgorithms\u002Fgraphs\u002Flowest-common-ancestor":3694,"\u002Falgorithms\u002Fgraphs\u002Ftwo-sat":3695,"\u002Falgorithms\u002Fgraphs\u002Feulerian-tours":3696,"\u002Falgorithms\u002Fgraphs\u002Fbipartite-matching":3697,"\u002Falgorithms\u002Fgreedy\u002Fthe-greedy-method":3698,"\u002Falgorithms\u002Fgreedy\u002Fscheduling-and-intervals":3699,"\u002Falgorithms\u002Fgreedy\u002Fhuffman-codes":3700,"\u002Falgorithms\u002Fgreedy\u002Fmatroids":3701,"\u002Falgorithms\u002Fgreedy\u002Fstable-matching":3702,"\u002Falgorithms\u002Fdynamic-programming\u002Fprinciples":3703,"\u002Falgorithms\u002Fdynamic-programming\u002Fsequence-dp":3704,"\u002Falgorithms\u002Fdynamic-programming\u002Flongest-increasing-subsequence":3705,"\u002Falgorithms\u002Fdynamic-programming\u002Fknapsack":3706,"\u002Falgorithms\u002Fdynamic-programming\u002Fcoin-change-and-unbounded":3707,"\u002Falgorithms\u002Fdynamic-programming\u002Finterval-dp":3708,"\u002Falgorithms\u002Fdynamic-programming\u002Ftree-dp":3709,"\u002Falgorithms\u002Fdynamic-programming\u002Fbitmask-dp":3710,"\u002Falgorithms\u002Fdynamic-programming\u002Fdp-optimizations":3711,"\u002Falgorithms\u002Fdynamic-programming\u002Fdp-on-graphs":3712,"\u002Falgorithms\u002Fdynamic-programming\u002Fdigit-and-probability-dp":3713,"\u002Falgorithms\u002Fbacktracking\u002Fbacktracking-fundamentals":3714,"\u002Falgorithms\u002Fbacktracking\u002Fconstraint-search":3715,"\u002Falgorithms\u002Fbacktracking\u002Fbranch-and-bound":3716,"\u002Falgorithms\u002Fbacktracking\u002Fgraph-backtracking":3717,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fnumber-theory-basics":3718,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fmodular-exponentiation-and-primality":3719,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fsieve-and-factorization":3720,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fcombinatorics":3721,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fmatrix-exponentiation":3722,"\u002Falgorithms\u002Fmathematical-algorithms\u002Ffast-fourier-transform":3723,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fgradient-descent":3724,"\u002Falgorithms\u002Fcomputational-geometry\u002Fgeometric-primitives":3725,"\u002Falgorithms\u002Fcomputational-geometry\u002Fconvex-hull":3726,"\u002Falgorithms\u002Fcomputational-geometry\u002Fsweep-line":3727,"\u002Falgorithms\u002Fcomputational-geometry\u002Fpolygons-and-proximity":3728,"\u002Falgorithms\u002Fintractability\u002Fp-np-reductions":3729,"\u002Falgorithms\u002Fintractability\u002Fnp-completeness":3730,"\u002Falgorithms\u002Fintractability\u002Fcoping-with-hardness":3731,"\u002Falgorithms\u002Fintractability\u002Fapproximation-algorithms":3732,"\u002Falgorithms":3733,"\u002Fcalculus\u002Flimits-and-continuity\u002Ffunctions-and-models":3734,"\u002Fcalculus\u002Flimits-and-continuity\u002Fthe-limit-of-a-function":3735,"\u002Fcalculus\u002Flimits-and-continuity\u002Flimit-laws-and-the-precise-definition":3736,"\u002Fcalculus\u002Flimits-and-continuity\u002Fcontinuity":3737,"\u002Fcalculus\u002Fderivatives\u002Fthe-derivative-and-rates-of-change":3738,"\u002Fcalculus\u002Fderivatives\u002Fdifferentiation-rules-and-the-chain-rule":3739,"\u002Fcalculus\u002Fderivatives\u002Fimplicit-differentiation-and-related-rates":3740,"\u002Fcalculus\u002Fderivatives\u002Flinear-approximations-and-differentials":3741,"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fextrema-and-the-mean-value-theorem":3742,"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fhow-derivatives-shape-a-graph":3743,"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fcurve-sketching-and-optimization":3744,"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fnewtons-method-and-antiderivatives":3745,"\u002Fcalculus\u002Fintegrals\u002Farea-and-the-definite-integral":3746,"\u002Fcalculus\u002Fintegrals\u002Fthe-fundamental-theorem-of-calculus":3747,"\u002Fcalculus\u002Fintegrals\u002Fthe-substitution-rule":3748,"\u002Fcalculus\u002Fapplications-of-integration\u002Fareas-and-volumes":3749,"\u002Fcalculus\u002Fapplications-of-integration\u002Fwork-average-value-and-arc-length":3750,"\u002Fcalculus\u002Fapplications-of-integration\u002Fphysics-economics-and-probability":3751,"\u002Fcalculus\u002Fexponential-logarithmic-and-inverse-functions\u002Finverse-functions-logarithms-and-exponentials":3752,"\u002Fcalculus\u002Fexponential-logarithmic-and-inverse-functions\u002Fgrowth-decay-inverse-trig-and-hyperbolic-functions":3753,"\u002Fcalculus\u002Fexponential-logarithmic-and-inverse-functions\u002Flhospitals-rule":3754,"\u002Fcalculus\u002Ftechniques-of-integration\u002Fintegration-by-parts":3755,"\u002Fcalculus\u002Ftechniques-of-integration\u002Ftrigonometric-integrals-and-substitution":3756,"\u002Fcalculus\u002Ftechniques-of-integration\u002Fpartial-fractions-and-integration-strategy":3757,"\u002Fcalculus\u002Ftechniques-of-integration\u002Fapproximate-and-improper-integrals":3758,"\u002Fcalculus\u002Fparametric-and-polar\u002Fparametric-curves-and-their-calculus":3759,"\u002Fcalculus\u002Fparametric-and-polar\u002Fpolar-coordinates":3760,"\u002Fcalculus\u002Fparametric-and-polar\u002Fconic-sections":3761,"\u002Fcalculus\u002Fsequences-and-series\u002Fsequences":3762,"\u002Fcalculus\u002Fsequences-and-series\u002Fseries-and-the-integral-test":3763,"\u002Fcalculus\u002Fsequences-and-series\u002Fthe-convergence-tests":3764,"\u002Fcalculus\u002Fsequences-and-series\u002Fpower-series":3765,"\u002Fcalculus\u002Fsequences-and-series\u002Ftaylor-and-maclaurin-series":3766,"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fvectors-and-the-dot-product":3767,"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fthe-cross-product-lines-and-planes":3748,"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fcylinders-and-quadric-surfaces":3768,"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fvector-functions-and-space-curves":3769,"\u002Fcalculus\u002Fvectors-and-space-curves\u002Farc-length-curvature-and-motion":3770,"\u002Fcalculus\u002Fpartial-derivatives\u002Ffunctions-of-several-variables":3738,"\u002Fcalculus\u002Fpartial-derivatives\u002Fpartial-derivatives":3771,"\u002Fcalculus\u002Fpartial-derivatives\u002Ftangent-planes-and-the-chain-rule":3772,"\u002Fcalculus\u002Fpartial-derivatives\u002Fdirectional-derivatives-and-the-gradient":3773,"\u002Fcalculus\u002Fpartial-derivatives\u002Foptimization-and-lagrange-multipliers":3774,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fdouble-integrals":3775,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Ftriple-integrals-and-coordinate-systems":3776,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fvector-fields-and-line-integrals":3777,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fgreens-theorem-curl-and-divergence":3778,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fsurface-integrals":3779,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fstokes-and-the-divergence-theorem":3780,"\u002Fcalculus":3781,"\u002Fmechanics\u002Ffoundations\u002Fmeasurement-and-dimensions":3782,"\u002Fmechanics\u002Ffoundations\u002Fvector-algebra":3783,"\u002Fmechanics\u002Fkinematics\u002Fone-dimensional-motion":3784,"\u002Fmechanics\u002Fkinematics\u002Fmotion-graphs":3785,"\u002Fmechanics\u002Fkinematics\u002Fprojectile-motion":3786,"\u002Fmechanics\u002Fkinematics\u002Frelative-motion":3787,"\u002Fmechanics\u002Fkinematics\u002Fcircular-motion":3788,"\u002Fmechanics\u002Fdynamics\u002Fnewtons-laws":3789,"\u002Fmechanics\u002Fdynamics\u002Ffree-body-diagrams":3790,"\u002Fmechanics\u002Fdynamics\u002Ffriction-and-curved-motion":3791,"\u002Fmechanics\u002Fdynamics\u002Fnumerical-dynamics":3792,"\u002Fmechanics\u002Fdynamics\u002Fcenter-of-mass-systems":3793,"\u002Fmechanics\u002Fenergy\u002Fwork-and-kinetic-energy":3794,"\u002Fmechanics\u002Fenergy\u002Fpotential-energy":3795,"\u002Fmechanics\u002Fenergy\u002Fmultiparticle-work":3796,"\u002Fmechanics\u002Fenergy\u002Fmass-energy-and-binding":3797,"\u002Fmechanics\u002Fenergy\u002Fphotons-and-quantization":3798,"\u002Fmechanics\u002Fmomentum\u002Fmomentum-and-collisions":3799,"\u002Fmechanics\u002Fmomentum\u002Fcenter-of-mass-collisions":3800,"\u002Fmechanics\u002Fmomentum\u002Frocket-propulsion":3801,"\u002Fmechanics\u002Frotation\u002Frotational-inertia":3802,"\u002Fmechanics\u002Frotation\u002Frotational-dynamics":3803,"\u002Fmechanics\u002Frotation\u002Frolling-motion":3804,"\u002Fmechanics\u002Frotation\u002Fangular-momentum":3805,"\u002Fmechanics\u002Frotation\u002Frolling-resistance":3806,"\u002Fmechanics\u002Frotation\u002Fgyroscopic-precession":3807,"\u002Fmechanics\u002Fgravity-and-matter\u002Fkeplerian-orbits":3808,"\u002Fmechanics\u002Fgravity-and-matter\u002Fgravitational-fields":3809,"\u002Fmechanics\u002Fgravity-and-matter\u002Fstatic-equilibrium":3810,"\u002Fmechanics\u002Fgravity-and-matter\u002Ffluid-statics":3811,"\u002Fmechanics\u002Fgravity-and-matter\u002Ffluid-flow":3812,"\u002Fmechanics\u002Fgravity-and-matter\u002Forbital-motion":3813,"\u002Fmechanics\u002Fgravity-and-matter\u002Fstress-and-elasticity":3814,"\u002Fmechanics\u002Foscillations-waves\u002Fdamped-oscillators":3815,"\u002Fmechanics\u002Foscillations-waves\u002Ftravelling-waves":3816,"\u002Fmechanics\u002Foscillations-waves\u002Fwave-superposition":3817,"\u002Fmechanics\u002Foscillations-waves\u002Fstanding-waves":3818,"\u002Fmechanics\u002Foscillations-waves\u002Fsound-waves":3819,"\u002Fmechanics\u002Foscillations-waves\u002Fdoppler-effect":3820,"\u002Fmechanics\u002Foscillations-waves\u002Fwave-packets":3821,"\u002Fmechanics\u002Foscillations-waves\u002Fbeats-and-coupling":3822,"\u002Fmechanics\u002Foscillations-waves\u002Fsimple-harmonic-motion":3823,"\u002Fmechanics\u002Foscillations-waves\u002Fpendulum-motion":3824,"\u002Fmechanics\u002Foscillations-waves\u002Fdriven-oscillators":3825,"\u002Fmechanics\u002Foscillations-waves\u002Fwave-boundaries":3826,"\u002Fmechanics\u002Fthermodynamics\u002Fkinetic-theory-of-ideal-gases":3827,"\u002Fmechanics\u002Fthermodynamics\u002Ffirst-law-of-thermodynamics":3828,"\u002Fmechanics\u002Fthermodynamics\u002Fentropy-and-the-second-law":3829,"\u002Fmechanics\u002Fthermodynamics\u002Fthermal-processes":3830,"\u002Fmechanics\u002Fthermodynamics\u002Fphase-changes":3831,"\u002Fmechanics\u002Fthermodynamics\u002Fthermal-machines":3832,"\u002Fmechanics":3833,"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Fcharge-and-conductors":3834,"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Fcoulombs-law":3835,"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Felectric-field-and-force":3836,"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Felectric-field-maps":3837,"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Felectric-dipoles":3838,"\u002Felectricity-and-magnetism\u002Fcontinuous-charge-distributions\u002Fcontinuous-charge-fields":3839,"\u002Felectricity-and-magnetism\u002Fcontinuous-charge-distributions\u002Fgauss-law-and-conductors":3840,"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Fpoint-charge-potential":3841,"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Fpotential-gradients-and-equipotentials":3842,"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Felectrostatic-energy-and-pressure":3843,"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Flaplace-boundary-problems":3844,"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Fcontinuous-charge-potentials":3845,"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fcapacitance-fundamentals":3822,"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fcapacitor-networks":3846,"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fcapacitor-energy-and-force":3847,"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fdielectric-polarization-and-breakdown":3848,"\u002Felectricity-and-magnetism\u002Fdirect-current-circuits\u002Fcurrent-and-resistance":3818,"\u002Felectricity-and-magnetism\u002Fdirect-current-circuits\u002Fkirchhoff-network-analysis":3683,"\u002Felectricity-and-magnetism\u002Fdirect-current-circuits\u002Frc-transients":3849,"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmagnetic-trajectories":3809,"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fhall-effect":3850,"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmagnetic-force-on-conductors":3851,"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmagnetic-dipoles":3852,"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmass-spectrometry":3853,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fmoving-charge-fields":3854,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fbiot-savart-law":3855,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fcircular-current-loops":3856,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Famperes-law":3857,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fgauss-law-for-magnetism":3858,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fmagnetic-materials":3783,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fmagnetic-flux":3859,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Ffaradays-law":3860,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Flenzs-law":3861,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fmotional-emf":3862,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Feddy-currents":3863,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fself-inductance":3864,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fmagnetic-energy":3865,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Frl-circuits":3866,"\u002Felectricity-and-magnetism\u002Falternating-current\u002Fac-fundamentals":3801,"\u002Felectricity-and-magnetism\u002Falternating-current\u002Freactance":3800,"\u002Felectricity-and-magnetism\u002Falternating-current\u002Frlc-resonance":3867,"\u002Felectricity-and-magnetism\u002Falternating-current\u002Fac-power":3868,"\u002Felectricity-and-magnetism\u002Falternating-current\u002Ftransformers":3869,"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Fdisplacement-current":3870,"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Felectromagnetic-waves":3871,"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Felectromagnetic-momentum":3872,"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Fdipole-radiation":3873,"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Fpolarization":3874,"\u002Felectricity-and-magnetism\u002Foptics\u002Freflection-and-refraction":3875,"\u002Felectricity-and-magnetism\u002Foptics\u002Fthin-lenses":3827,"\u002Felectricity-and-magnetism\u002Foptics\u002Fspherical-mirrors":3825,"\u002Felectricity-and-magnetism":3876,"\u002Flinear-algebra\u002Flinear-systems\u002Fsystems-and-echelon-forms":3877,"\u002Flinear-algebra\u002Flinear-systems\u002Fvector-and-matrix-equations":3878,"\u002Flinear-algebra\u002Flinear-systems\u002Fsolution-sets-and-applications":3879,"\u002Flinear-algebra\u002Flinear-systems\u002Flinear-independence":3880,"\u002Flinear-algebra\u002Flinear-systems\u002Flinear-transformations":3881,"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fmatrix-operations":3882,"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fmatrix-inverse-and-invertibility":3883,"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fpartitioned-matrices-and-lu":3884,"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fsubspaces-dimension-rank":3885,"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fapplications-leontief-and-graphics":3735,"\u002Flinear-algebra\u002Fdeterminants\u002Fdeterminants-and-cofactors":3886,"\u002Flinear-algebra\u002Fdeterminants\u002Fproperties-of-determinants":3887,"\u002Flinear-algebra\u002Fdeterminants\u002Fcramer-volume-and-area":3739,"\u002Flinear-algebra\u002Fvector-spaces\u002Fvector-spaces-and-subspaces":3888,"\u002Flinear-algebra\u002Fvector-spaces\u002Fnull-and-column-spaces":3889,"\u002Flinear-algebra\u002Fvector-spaces\u002Fbases-and-independent-sets":3890,"\u002Flinear-algebra\u002Fvector-spaces\u002Fcoordinate-systems":3891,"\u002Flinear-algebra\u002Fvector-spaces\u002Fdimension-and-rank":3892,"\u002Flinear-algebra\u002Fvector-spaces\u002Fchange-of-basis":3893,"\u002Flinear-algebra\u002Fvector-spaces\u002Fdifference-equations-and-markov":3894,"\u002Flinear-algebra\u002Feigenvalues\u002Feigenvectors-and-eigenvalues":3895,"\u002Flinear-algebra\u002Feigenvalues\u002Fthe-characteristic-equation":3896,"\u002Flinear-algebra\u002Feigenvalues\u002Fdiagonalization":3897,"\u002Flinear-algebra\u002Feigenvalues\u002Feigenvectors-and-linear-transformations":3898,"\u002Flinear-algebra\u002Feigenvalues\u002Fcomplex-eigenvalues":3899,"\u002Flinear-algebra\u002Feigenvalues\u002Fdynamical-systems":3900,"\u002Flinear-algebra\u002Feigenvalues\u002Fpower-method":3901,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Finner-product-length-orthogonality":3902,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Forthogonal-sets-and-projections":3903,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Fgram-schmidt-and-qr":3904,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Fleast-squares-problems":3905,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Fleast-squares-applications":3906,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Finner-product-spaces":3907,"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fdiagonalizing-symmetric-matrices":3774,"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fquadratic-forms":3908,"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fconstrained-optimization":3909,"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fsingular-value-decomposition":3910,"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fsvd-applications-pca-imaging":3911,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fnumerical-thinking-and-matrix-computation":3912,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Flu-and-cholesky":3913,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fconditioning-and-floating-point":3914,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fstability-and-error-analysis":3915,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fqr-and-numerical-least-squares":3916,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fnumerical-eigenvalues-and-svd":3917,"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Faffine-combinations":3918,"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Faffine-independence-and-barycentric-coordinates":3919,"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Fconvex-combinations-and-convex-sets":3920,"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Fhyperplanes-and-polytopes":3921,"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Fcurves-and-surfaces":3922,"\u002Flinear-algebra":3923,"\u002Ftheory-of-computation":3924,"\u002Fcomputer-architecture\u002Ffoundations\u002Fbits-bytes-and-words":3925,"\u002Fcomputer-architecture\u002Ffoundations\u002Finteger-representation":3926,"\u002Fcomputer-architecture\u002Ffoundations\u002Finteger-arithmetic":3927,"\u002Fcomputer-architecture\u002Ffoundations\u002Ffloating-point":3928,"\u002Fcomputer-architecture\u002Ffoundations\u002Fboolean-algebra-and-bit-manipulation":3929,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fthe-machines-view":3930,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fdata-movement":3931,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Farithmetic-and-logic":3932,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fcontrol-flow":3933,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fprocedures":3934,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Farrays-structs-and-alignment":3935,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fmemory-layout-and-buffer-overflows":3936,"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Fwhat-an-isa-is":3937,"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Finstruction-formats-and-operands":3938,"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Faddressing-modes":3939,"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Fthe-y86-64-instruction-set":3940,"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Fy86-64-programming":3941,"\u002Fcomputer-architecture\u002Fdigital-logic\u002Ftransistors-gates-and-boolean-functions":3942,"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fcombinational-logic-and-hcl":3943,"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fmultiplexers-decoders-and-the-alu":3944,"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fmemory-elements-latches-flip-flops-and-clocking":3945,"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fregister-files-and-random-access-memory":3946,"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fthe-fetch-decode-execute-cycle":3947,"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fthe-seq-stages":3948,"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fcontrol-logic-and-sequencing":3949,"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fassembling-seq":3950,"\u002Fcomputer-architecture\u002Fprocessor-design\u002Ftracing-a-program":3951,"\u002Fcomputer-architecture\u002Fpipelining\u002Fpipelining-principles":3952,"\u002Fcomputer-architecture\u002Fpipelining\u002Ffrom-seq-to-pipe":3953,"\u002Fcomputer-architecture\u002Fpipelining\u002Fdata-hazards-stalling-and-forwarding":3954,"\u002Fcomputer-architecture\u002Fpipelining\u002Fcontrol-hazards-and-branch-prediction":3955,"\u002Fcomputer-architecture\u002Fpipelining\u002Fthe-complete-pipe-processor":3956,"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fstorage-technologies-and-the-latency-gap":3957,"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Flocality":3958,"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fcache-memories-direct-mapped":3959,"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fset-associative-and-write-policies":3960,"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fcache-performance-and-cache-friendly-code":3961,"\u002Fcomputer-architecture\u002Fvirtual-memory\u002Faddress-spaces-and-translation":3962,"\u002Fcomputer-architecture\u002Fvirtual-memory\u002Fpage-tables-and-page-faults":3963,"\u002Fcomputer-architecture\u002Fvirtual-memory\u002Fthe-tlb-and-multi-level-page-tables":3964,"\u002Fcomputer-architecture\u002Fexceptions-and-io\u002Fexceptional-control-flow":3965,"\u002Fcomputer-architecture\u002Fexceptions-and-io\u002Finterrupts-and-the-kernel":3966,"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fprocesses-threads-and-parallelism":3967,"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fhardware-multithreading":3968,"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fcache-coherence":3969,"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fmemory-consistency-and-synchronization":3970,"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fmulticore-organization":3971,"\u002Fcomputer-architecture\u002Fcapstone\u002Fthe-whole-machine":3972,"\u002Fcomputer-architecture\u002Fcapstone\u002Fassembling-a-complete-cpu":3973,"\u002Fcomputer-architecture":3924,"\u002Fdifferential-equations\u002Ffoundations\u002Fmodels-and-direction-fields":3974,"\u002Fdifferential-equations\u002Ffoundations\u002Fclassification-and-terminology":3975,"\u002Fdifferential-equations\u002Ffirst-order\u002Flinear-first-order-integrating-factors":3976,"\u002Fdifferential-equations\u002Ffirst-order\u002Fseparable-and-exact":3739,"\u002Fdifferential-equations\u002Ffirst-order\u002Fmodeling-first-order":3977,"\u002Fdifferential-equations\u002Ffirst-order\u002Fautonomous-and-population-dynamics":3738,"\u002Fdifferential-equations\u002Ffirst-order\u002Fexistence-uniqueness-euler":3745,"\u002Fdifferential-equations\u002Ffirst-order\u002Ffirst-order-difference-equations":3978,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fhomogeneous-constant-coefficients":3979,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fcomplex-and-repeated-roots":3779,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fnonhomogeneous-undetermined-coefficients":3980,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fvariation-of-parameters":3981,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fmechanical-electrical-vibrations":3982,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fhigher-order-linear":3983,"\u002Fdifferential-equations\u002Fseries-solutions\u002Fpower-series-ordinary-points":3984,"\u002Fdifferential-equations\u002Fseries-solutions\u002Fregular-singular-frobenius":3985,"\u002Fdifferential-equations\u002Fseries-solutions\u002Fbessel-and-special-functions":3986,"\u002Fdifferential-equations\u002Flaplace\u002Flaplace-definition-ivps":3987,"\u002Fdifferential-equations\u002Flaplace\u002Fstep-impulse-convolution":3988,"\u002Fdifferential-equations\u002Fsystems\u002Fmatrices-eigenvalues-review":3989,"\u002Fdifferential-equations\u002Fsystems\u002Fconstant-coefficient-systems-phase-portraits":3990,"\u002Fdifferential-equations\u002Fsystems\u002Frepeated-eigenvalues-fundamental-matrices":3991,"\u002Fdifferential-equations\u002Fnumerical\u002Feuler-and-runge-kutta":3986,"\u002Fdifferential-equations\u002Fnumerical\u002Fmultistep-systems-stability":3992,"\u002Fdifferential-equations\u002Fnonlinear\u002Fphase-plane-autonomous-stability":3993,"\u002Fdifferential-equations\u002Fnonlinear\u002Flocally-linear-and-liapunov":3994,"\u002Fdifferential-equations\u002Fnonlinear\u002Fcompeting-species-predator-prey-limit-cycles":3995,"\u002Fdifferential-equations\u002Fpdes-fourier-bvp\u002Ffourier-series":3996,"\u002Fdifferential-equations\u002Fpdes-fourier-bvp\u002Fheat-wave-laplace-equations":3997,"\u002Fdifferential-equations\u002Fpdes-fourier-bvp\u002Fsturm-liouville":3998,"\u002Fdifferential-equations\u002Fhistory-variations\u002Fcalculus-of-variations":3999,"\u002Fdifferential-equations\u002Fhistory-variations\u002Fhistorical-notes":4000,"\u002Fdifferential-equations":4001,"\u002Frelativity\u002Ffoundations\u002Fspecial-relativity-postulates":4002,"\u002Frelativity\u002Ffoundations\u002Florentz-transformation-spacetime":4003,"\u002Frelativity\u002Ffoundations\u002Ftime-dilation-length-contraction":4004,"\u002Frelativity\u002Ffoundations\u002Frelativistic-momentum-energy":4005,"\u002Frelativity\u002Ffoundations\u002Fgeneral-relativity":3884,"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Fminkowski-spacetime-and-the-interval":4006,"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Ffour-vectors-and-index-notation":4007,"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Fthe-lorentz-group-and-rapidity":4008,"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Fdoppler-aberration-and-appearance":4009,"\u002Frelativity\u002Frelativistic-dynamics\u002Ffour-momentum-force-and-accelerated-motion":4010,"\u002Frelativity\u002Frelativistic-dynamics\u002Fparticle-decays-and-two-body-kinematics":4011,"\u002Frelativity\u002Frelativistic-dynamics\u002Fcollisions-thresholds-and-the-cm-frame":3754,"\u002Frelativity\u002Frelativistic-dynamics\u002Fmandelstam-variables-and-invariants":4012,"\u002Frelativity\u002Fcovariant-electrodynamics\u002Ffour-current-and-the-four-potential":4013,"\u002Frelativity\u002Fcovariant-electrodynamics\u002Fthe-electromagnetic-field-tensor":4014,"\u002Frelativity\u002Fcovariant-electrodynamics\u002Ftransformation-of-electric-and-magnetic-fields":4015,"\u002Frelativity\u002Fcovariant-electrodynamics\u002Fcovariant-maxwell-and-the-stress-energy-tensor":4016,"\u002Frelativity\u002Fcurved-spacetime\u002Fthe-equivalence-principle-formalized":4017,"\u002Frelativity\u002Fcurved-spacetime\u002Fmanifolds-vectors-and-the-metric":4018,"\u002Frelativity\u002Fcurved-spacetime\u002Fcovariant-derivative-and-christoffel-symbols":4019,"\u002Frelativity\u002Fcurved-spacetime\u002Fgeodesics-and-the-geodesic-equation":4020,"\u002Frelativity\u002Fcurved-spacetime\u002Fcurvature-riemann-and-geodesic-deviation":4021,"\u002Frelativity\u002Fcurved-spacetime\u002Fthe-einstein-field-equations":3976,"\u002Frelativity\u002Fthe-schwarzschild-solution\u002Fthe-schwarzschild-metric":4022,"\u002Frelativity\u002Fthe-schwarzschild-solution\u002Fgeodesics-and-orbits-in-schwarzschild":4023,"\u002Frelativity\u002Fthe-schwarzschild-solution\u002Flight-bending-and-null-geodesics":4024,"\u002Frelativity\u002Ftests-of-general-relativity\u002Fperihelion-precession-of-mercury":4025,"\u002Frelativity\u002Ftests-of-general-relativity\u002Fdeflection-of-light-and-gravitational-lensing":4026,"\u002Frelativity\u002Ftests-of-general-relativity\u002Fgravitational-redshift-and-shapiro-delay":3905,"\u002Frelativity\u002Ftests-of-general-relativity\u002Frelativity-in-technology-gps":4027,"\u002Frelativity\u002Fblack-holes\u002Fhorizons-and-coordinate-singularities":4028,"\u002Frelativity\u002Fblack-holes\u002Frotating-and-charged-black-holes":3915,"\u002Frelativity\u002Fblack-holes\u002Fblack-hole-thermodynamics":4029,"\u002Frelativity\u002Fgravitational-waves\u002Flinearized-gravity-and-wave-solutions":4030,"\u002Frelativity\u002Fgravitational-waves\u002Fgeneration-and-the-quadrupole-formula":4031,"\u002Frelativity\u002Fgravitational-waves\u002Fdetection-ligo-and-the-first-events":4032,"\u002Frelativity\u002Fcosmological-bridge\u002Fthe-cosmological-principle-and-flrw-metric":4033,"\u002Frelativity\u002Fcosmological-bridge\u002Ffriedmann-equations-and-cosmic-dynamics":4034,"\u002Frelativity":4035,"\u002Fphysical-computing":3924,"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fblackbody-radiation-and-the-planck-quantum":4036,"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fthe-photoelectric-effect-and-the-photon":4015,"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fx-rays-and-the-compton-effect":4037,"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fthe-old-quantum-theory-bohr-and-sommerfeld":4038,"\u002Fquantum-mechanics\u002Fmatter-waves\u002Fde-broglie-waves-and-electron-diffraction":4039,"\u002Fquantum-mechanics\u002Fmatter-waves\u002Fwave-packets-and-the-probability-interpretation":4040,"\u002Fquantum-mechanics\u002Fmatter-waves\u002Fthe-uncertainty-principle":4041,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fthe-schrodinger-equation-in-one-dimension":4042,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fthe-free-particle-and-wave-packet-dynamics":4043,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fparticle-in-infinite-and-finite-square-wells":3991,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Foperators-expectation-values-and-the-harmonic-oscillator":3915,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fthe-dirac-delta-potential":4044,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fbarrier-penetration-and-quantum-tunneling":4045,"\u002Fquantum-mechanics\u002Fformalism\u002Fhilbert-space-and-dirac-notation":4046,"\u002Fquantum-mechanics\u002Fformalism\u002Fobservables-hermitian-operators-and-eigenvalues":4047,"\u002Fquantum-mechanics\u002Fformalism\u002Fthe-postulates-and-quantum-measurement":4043,"\u002Fquantum-mechanics\u002Fformalism\u002Fposition-momentum-and-continuous-spectra":4048,"\u002Fquantum-mechanics\u002Fformalism\u002Fcommutators-and-the-generalized-uncertainty-principle":4023,"\u002Fquantum-mechanics\u002Fformalism\u002Ftime-evolution-schrodinger-and-heisenberg-pictures":3776,"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fladder-operators-and-the-number-states":4049,"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fcoherent-and-squeezed-states":4050,"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fsymmetries-generators-and-conservation-laws":3756,"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fparity-time-reversal-and-discrete-symmetries":4051,"\u002Fquantum-mechanics\u002Fangular-momentum\u002Forbital-angular-momentum-and-spherical-harmonics":4052,"\u002Fquantum-mechanics\u002Fangular-momentum\u002Fthe-angular-momentum-algebra":4053,"\u002Fquantum-mechanics\u002Fangular-momentum\u002Faddition-of-angular-momenta-and-clebsch-gordan":4054,"\u002Fquantum-mechanics\u002Fcentral-potentials\u002Fthe-schrodinger-equation-in-three-dimensions":4055,"\u002Fquantum-mechanics\u002Fcentral-potentials\u002Fthe-hydrogen-atom":4056,"\u002Fquantum-mechanics\u002Fcentral-potentials\u002Fthe-isotropic-oscillator-and-hidden-symmetry":4057,"\u002Fquantum-mechanics\u002Fspin\u002Fspin-half-pauli-matrices-and-stern-gerlach":4058,"\u002Fquantum-mechanics\u002Fspin\u002Fspin-in-a-magnetic-field-precession-and-resonance":4059,"\u002Fquantum-mechanics\u002Fspin\u002Ftwo-level-systems-and-the-bloch-sphere":4015,"\u002Fquantum-mechanics\u002Fidentical-particles\u002Fidentical-particles-and-exchange-symmetry":4060,"\u002Fquantum-mechanics\u002Fidentical-particles\u002Fthe-pauli-principle-atoms-and-the-periodic-table":4061,"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Ftime-independent-perturbation-theory":4062,"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Ffine-structure-and-the-real-hydrogen-atom":4049,"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Fthe-zeeman-and-stark-effects":3737,"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Fthe-variational-method":4063,"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Fthe-wkb-approximation":4064,"\u002Fquantum-mechanics":4065,"\u002Freal-analysis\u002Ffoundations\u002Fsets-logic-functions":3999,"\u002Freal-analysis\u002Ffoundations\u002Fordered-fields-completeness":4066,"\u002Freal-analysis\u002Ffoundations\u002Fabsolute-value-bounds":4067,"\u002Freal-analysis\u002Ffoundations\u002Fintervals-uncountability":3888,"\u002Freal-analysis\u002Fsequences-series\u002Fsequences-limits":4068,"\u002Freal-analysis\u002Fsequences-series\u002Flimit-laws-monotone":3774,"\u002Freal-analysis\u002Fsequences-series\u002Flimsup-bolzano-weierstrass":4069,"\u002Freal-analysis\u002Fsequences-series\u002Fcauchy-completeness":4070,"\u002Freal-analysis\u002Fsequences-series\u002Fseries-convergence":3911,"\u002Freal-analysis\u002Fsequences-series\u002Fabsolute-conditional-rearrangement":4021,"\u002Freal-analysis\u002Fmetric-spaces\u002Fmetric-spaces-norms":4071,"\u002Freal-analysis\u002Fmetric-spaces\u002Fopen-closed-sets":4072,"\u002Freal-analysis\u002Fmetric-spaces\u002Fconvergence-completeness":4073,"\u002Freal-analysis\u002Fmetric-spaces\u002Fcompactness":4074,"\u002Freal-analysis\u002Fmetric-spaces\u002Fconnectedness":4075,"\u002Freal-analysis\u002Fcontinuity\u002Flimits-of-functions":4048,"\u002Freal-analysis\u002Fcontinuity\u002Fcontinuous-functions":4076,"\u002Freal-analysis\u002Fcontinuity\u002Fevt-ivt":3881,"\u002Freal-analysis\u002Fcontinuity\u002Funiform-continuity":4077,"\u002Freal-analysis\u002Fcontinuity\u002Fcontinuity-metric-spaces":4078,"\u002Freal-analysis\u002Fcontinuity\u002Flimits-infinity-monotone":3735,"\u002Freal-analysis\u002Fdifferentiation\u002Fthe-derivative":4079,"\u002Freal-analysis\u002Fdifferentiation\u002Fmean-value-theorem":4080,"\u002Freal-analysis\u002Fdifferentiation\u002Ftaylors-theorem":4037,"\u002Freal-analysis\u002Fdifferentiation\u002Finverse-function-1d":3764,"\u002Freal-analysis\u002Friemann-integration\u002Fdarboux-integral":3915,"\u002Freal-analysis\u002Friemann-integration\u002Fintegrability-classes":4081,"\u002Freal-analysis\u002Friemann-integration\u002Fproperties-of-the-integral":4082,"\u002Freal-analysis\u002Friemann-integration\u002Ffundamental-theorem":3900,"\u002Freal-analysis\u002Friemann-integration\u002Flog-exp-improper":4025,"\u002Freal-analysis\u002Ffunction-sequences\u002Fpointwise-uniform-convergence":4083,"\u002Freal-analysis\u002Ffunction-sequences\u002Finterchange-of-limits":4084,"\u002Freal-analysis\u002Ffunction-sequences\u002Fpower-series-weierstrass":4085,"\u002Freal-analysis\u002Ffunction-sequences\u002Fpicard-ode":3920,"\u002Freal-analysis\u002Fseveral-variables\u002Fdifferentiability-rn":4086,"\u002Freal-analysis\u002Fseveral-variables\u002Fgradient-chain-rule":4087,"\u002Freal-analysis\u002Fseveral-variables\u002Fhigher-derivatives-taylor-extrema":4088,"\u002Freal-analysis\u002Fseveral-variables\u002Finverse-implicit-theorems":4088,"\u002Freal-analysis\u002Fseveral-variables\u002Fmultiple-integrals":4089,"\u002Freal-analysis":4090,"\u002Fabstract-algebra\u002Ffoundations\u002Fsets-functions-relations":4091,"\u002Fabstract-algebra\u002Ffoundations\u002Fintegers-and-modular-arithmetic":4092,"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fgroup-axioms-and-first-examples":4093,"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fdihedral-and-symmetric-groups":4094,"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fmatrix-and-quaternion-groups":4095,"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fhomomorphisms-and-group-actions":4096,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fsubgroups-and-substructures":4097,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fcyclic-groups":4098,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fgeneration-and-subgroup-lattices":4099,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fcosets-lagrange-and-normal-subgroups":4100,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fisomorphism-theorems":4064,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fcomposition-series-and-the-alternating-group":4101,"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Factions-and-cayleys-theorem":4093,"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Fconjugation-and-the-class-equation":4010,"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Fsylow-theorems":4102,"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Fautomorphisms-and-simple-groups":4103,"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fdirect-products-and-finite-abelian-groups":4104,"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fsemidirect-products":4105,"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fnilpotent-and-solvable-groups":4106,"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fclassifying-small-groups":4107,"\u002Fabstract-algebra\u002Fring-theory\u002Frings-definitions-and-examples":4108,"\u002Fabstract-algebra\u002Fring-theory\u002Fideals-quotients-and-homomorphisms":4109,"\u002Fabstract-algebra\u002Fring-theory\u002Ffractions-and-the-chinese-remainder-theorem":4103,"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Feuclidean-domains-pids-ufds":4110,"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Fpolynomial-rings-over-fields":4079,"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Fgauss-lemma-and-unique-factorization":4111,"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Firreducibility-criteria-and-groebner":4112,"\u002Fabstract-algebra\u002Fmodule-theory\u002Fintroduction-to-modules":4113,"\u002Fabstract-algebra\u002Fmodule-theory\u002Ffree-modules-and-direct-sums":4114,"\u002Fabstract-algebra\u002Fmodule-theory\u002Ftensor-products-and-exact-sequences":4115,"\u002Fabstract-algebra\u002Fmodule-theory\u002Fvector-spaces-and-linear-maps":4116,"\u002Fabstract-algebra\u002Fmodules-over-pids\u002Fstructure-theorem-over-pids":4117,"\u002Fabstract-algebra\u002Fmodules-over-pids\u002Frational-canonical-form":4118,"\u002Fabstract-algebra\u002Fmodules-over-pids\u002Fjordan-canonical-form":4119,"\u002Fabstract-algebra\u002Ffield-theory\u002Ffield-extensions-and-algebraic-elements":4120,"\u002Fabstract-algebra\u002Ffield-theory\u002Fstraightedge-and-compass-constructions":3753,"\u002Fabstract-algebra\u002Ffield-theory\u002Fsplitting-fields-and-algebraic-closure":4121,"\u002Fabstract-algebra\u002Ffield-theory\u002Fseparable-and-cyclotomic-extensions":4122,"\u002Fabstract-algebra\u002Fgalois-theory\u002Fthe-galois-correspondence":3995,"\u002Fabstract-algebra\u002Fgalois-theory\u002Ffinite-fields":4123,"\u002Fabstract-algebra\u002Fgalois-theory\u002Fcyclotomic-and-abelian-extensions":4124,"\u002Fabstract-algebra\u002Fgalois-theory\u002Fgalois-groups-of-polynomials":4052,"\u002Fabstract-algebra\u002Fgalois-theory\u002Fsolvability-by-radicals-and-the-quintic":4124,"\u002Fabstract-algebra\u002Fcapstone\u002Fcommutative-algebra-and-algebraic-geometry":4125,"\u002Fabstract-algebra\u002Fcapstone\u002Frepresentation-and-character-theory":4126,"\u002Fabstract-algebra":4127,"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fatomic-spectra-rutherford":4128,"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fbohr-model-hydrogen":4129,"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fx-ray-spectra-franck-hertz":4130,"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fbohr-sommerfeld-old-quantum-theory":4131,"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fold-quantum-theory-limits-wkb":4132,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fschrodinger-3d-hydrogen":4044,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fhydrogen-wave-functions":4133,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fradial-equation-in-full":4134,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fsymmetry-degeneracy-runge-lenz":4135,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fexpectation-values-virial":4136,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fquantum-defects-alkali-spectra":4137,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Frydberg-atoms":4138,"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Frelativistic-kinetic-correction":4139,"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Fspin-orbit-thomas-precession":3878,"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Fdarwin-term-fine-structure-formula":4007,"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Fdirac-equation-hydrogen":3753,"\u002Fatomic-physics\u002Fqed-corrections-and-hyperfine-structure\u002Flamb-shift-qed":4140,"\u002Fatomic-physics\u002Fqed-corrections-and-hyperfine-structure\u002Fhyperfine-structure-21cm":3737,"\u002Fatomic-physics\u002Fqed-corrections-and-hyperfine-structure\u002Fnuclear-effects-isotope-shift":4141,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fperiodic-table-atomic-spectra":4142,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fcentral-field-self-consistent":3775,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fidentical-particles-hartree-fock":4069,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fhelium-two-electron-atom":4143,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fls-jj-coupling-term-symbols":4144,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fhund-rules-ground-terms":4145,"\u002Fatomic-physics\u002Fatoms-in-external-fields\u002Fzeeman-effect":4146,"\u002Fatomic-physics\u002Fatoms-in-external-fields\u002Fpaschen-back-intermediate":4147,"\u002Fatomic-physics\u002Fatoms-in-external-fields\u002Fstark-effect-polarizability":4148,"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Ftime-dependent-perturbation-golden-rule":4149,"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Fdipole-approximation-einstein-coefficients":4150,"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Fselection-rules-forbidden-transitions":4151,"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Flifetimes-and-line-shapes":4152,"\u002Fatomic-physics\u002Flasers-and-spectroscopy\u002Flaser-principles":4153,"\u002Fatomic-physics\u002Flasers-and-spectroscopy\u002Fspectroscopy-techniques":4154,"\u002Fatomic-physics\u002Flasers-and-spectroscopy\u002Fline-catalog-nist-asd":4155,"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Flaser-cooling-doppler":4156,"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Fsub-doppler-trapping":4100,"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Fbose-einstein-condensation":4157,"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Foptical-clocks-precision":4158,"\u002Fatomic-physics":4159,"\u002Fdatabases":3924,"\u002Fcategory-theory\u002Ffoundations\u002Fwhat-is-a-category":4160,"\u002Fcategory-theory\u002Ffoundations\u002Fexamples-of-categories":4161,"\u002Fcategory-theory\u002Ffoundations\u002Fspecial-morphisms":4162,"\u002Fcategory-theory\u002Ffoundations\u002Ffunctors":4091,"\u002Fcategory-theory\u002Ffoundations\u002Fnatural-transformations":4163,"\u002Fcategory-theory\u002Ffoundations\u002Fsize-and-set-theory":4164,"\u002Fcategory-theory\u002Funiversal-properties\u002Funiversal-properties":4165,"\u002Fcategory-theory\u002Funiversal-properties\u002Fproducts-and-coproducts":4166,"\u002Fcategory-theory\u002Funiversal-properties\u002Fconstructions-on-categories":4167,"\u002Fcategory-theory\u002Frepresentables-yoneda\u002Frepresentable-functors":4168,"\u002Fcategory-theory\u002Frepresentables-yoneda\u002Fyoneda-lemma":4169,"\u002Fcategory-theory\u002Frepresentables-yoneda\u002Fyoneda-consequences":4170,"\u002Fcategory-theory\u002Flimits-colimits\u002Flimits":4171,"\u002Fcategory-theory\u002Flimits-colimits\u002Fproducts-equalizers-pullbacks":4172,"\u002Fcategory-theory\u002Flimits-colimits\u002Fcolimits":4173,"\u002Fcategory-theory\u002Flimits-colimits\u002Fcomputing-limits":4174,"\u002Fcategory-theory\u002Flimits-colimits\u002Flimits-and-functors":4175,"\u002Fcategory-theory\u002Fadjunctions\u002Fadjunctions":4176,"\u002Fcategory-theory\u002Fadjunctions\u002Funits-and-counits":4177,"\u002Fcategory-theory\u002Fadjunctions\u002Fadjunctions-via-universal-arrows":4178,"\u002Fcategory-theory\u002Fadjunctions\u002Ffree-forgetful-adjunctions":4179,"\u002Fcategory-theory\u002Fadjoints-limits\u002Flimits-via-adjoints":4180,"\u002Fcategory-theory\u002Fadjoints-limits\u002Fpresheaf-limits-colimits":4181,"\u002Fcategory-theory\u002Fadjoints-limits\u002Fadjoints-preserve-limits":4182,"\u002Fcategory-theory\u002Fadjoints-limits\u002Fadjoint-functor-theorem":4173,"\u002Fcategory-theory\u002Fmonads-algebras\u002Fmonads":4183,"\u002Fcategory-theory\u002Fmonads-algebras\u002Falgebras-eilenberg-moore":4184,"\u002Fcategory-theory\u002Fmonads-algebras\u002Fkleisli-and-programming":4185,"\u002Fcategory-theory\u002Fmonads-algebras\u002Falgebras-for-endofunctors":4186,"\u002Fcategory-theory\u002Fcartesian-closed-lambda\u002Fcartesian-closed-categories":4187,"\u002Fcategory-theory\u002Fcartesian-closed-lambda\u002Flambda-calculus-correspondence":4132,"\u002Fcategory-theory\u002Fcartesian-closed-lambda\u002Ffixed-points-and-recursion":4188,"\u002Fcategory-theory":4189,"\u002Fdeep-learning\u002Fmathematical-background\u002Flinear-algebra-for-deep-learning":4190,"\u002Fdeep-learning\u002Fmathematical-background\u002Fprobability-and-information-theory":4191,"\u002Fdeep-learning\u002Fmathematical-background\u002Fnumerical-computation":4192,"\u002Fdeep-learning\u002Fmathematical-background\u002Fcalculus":4193,"\u002Fdeep-learning\u002Ffoundations\u002Fwhat-is-deep-learning":4194,"\u002Fdeep-learning\u002Ffoundations\u002Fmachine-learning-refresher":4195,"\u002Fdeep-learning\u002Ffoundations\u002Flinear-models-and-the-perceptron":4154,"\u002Fdeep-learning\u002Fneural-networks\u002Fthe-multilayer-perceptron":4196,"\u002Fdeep-learning\u002Fneural-networks\u002Factivation-functions":4197,"\u002Fdeep-learning\u002Fneural-networks\u002Funiversal-approximation":4198,"\u002Fdeep-learning\u002Fneural-networks\u002Fbackpropagation":4199,"\u002Fdeep-learning\u002Fneural-networks\u002Floss-functions-and-output-units":4200,"\u002Fdeep-learning\u002Foptimization\u002Fgradient-descent-and-sgd":4201,"\u002Fdeep-learning\u002Foptimization\u002Fmomentum-and-adaptive-methods":4202,"\u002Fdeep-learning\u002Foptimization\u002Finitialization":4203,"\u002Fdeep-learning\u002Foptimization\u002Fthe-optimization-landscape":4204,"\u002Fdeep-learning\u002Foptimization\u002Fsecond-order-and-approximate-methods":4205,"\u002Fdeep-learning\u002Fregularization\u002Fregularization-overview":4206,"\u002Fdeep-learning\u002Fregularization\u002Fdropout-and-data-augmentation":4207,"\u002Fdeep-learning\u002Fregularization\u002Fearly-stopping-and-parameter-sharing":4208,"\u002Fdeep-learning\u002Fregularization\u002Fnormalization":4209,"\u002Fdeep-learning\u002Farchitectures\u002Fconvolutional-networks":4210,"\u002Fdeep-learning\u002Farchitectures\u002Fcnn-architectures":4211,"\u002Fdeep-learning\u002Farchitectures\u002Frecurrent-networks":4212,"\u002Fdeep-learning\u002Farchitectures\u002Flstm-and-gru":4213,"\u002Fdeep-learning\u002Farchitectures\u002Fattention-and-transformers":4214,"\u002Fdeep-learning\u002Farchitectures\u002Fthe-transformer-architecture":4215,"\u002Fdeep-learning\u002Farchitectures\u002Ftransformers-in-practice":4216,"\u002Fdeep-learning\u002Farchitectures\u002Fgraph-neural-networks":4217,"\u002Fdeep-learning\u002Farchitectures\u002Fstate-space-models":4218,"\u002Fdeep-learning\u002Ftheory\u002Fgeneralization-theory":4219,"\u002Fdeep-learning\u002Ftheory\u002Fadversarial-robustness":4220,"\u002Fdeep-learning\u002Ftheory\u002Fadversarial-defenses":4221,"\u002Fdeep-learning\u002Ftheory\u002Fbayesian-and-ensemble-methods":4222,"\u002Fdeep-learning\u002Ftheory\u002Fdeep-equilibrium-models":4166,"\u002Fdeep-learning\u002Fgenerative-models\u002Flinear-factor-models":4223,"\u002Fdeep-learning\u002Fgenerative-models\u002Fautoencoders":4224,"\u002Fdeep-learning\u002Fgenerative-models\u002Fvariational-autoencoders":4225,"\u002Fdeep-learning\u002Fgenerative-models\u002Fgenerative-adversarial-networks":4226,"\u002Fdeep-learning\u002Fgenerative-models\u002Fautoregressive-and-normalizing-flows":4227,"\u002Fdeep-learning\u002Fgenerative-models\u002Fenergy-based-and-boltzmann-machines":4228,"\u002Fdeep-learning\u002Fgenerative-models\u002Fdiffusion-and-score-based-models":4229,"\u002Fdeep-learning\u002Fprobabilistic-methods\u002Fstructured-probabilistic-models":3718,"\u002Fdeep-learning\u002Fprobabilistic-methods\u002Fmonte-carlo-and-mcmc":4230,"\u002Fdeep-learning\u002Fprobabilistic-methods\u002Fapproximate-inference":4231,"\u002Fdeep-learning\u002Fpractical\u002Fpractical-methodology":3954,"\u002Fdeep-learning\u002Fpractical\u002Fhyperparameters-and-debugging":4232,"\u002Fdeep-learning\u002Fpractical\u002Frepresentation-learning":4233,"\u002Fdeep-learning\u002Fpractical\u002Ftransfer-learning":4234,"\u002Fdeep-learning\u002Fpractical\u002Fapplications":4235,"\u002Fdeep-learning\u002Fpractical\u002Fmodel-compression-and-distillation":4236,"\u002Fdeep-learning\u002Fpractical\u002Fmeta-learning-and-few-shot":4237,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Flarge-language-models":4238,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fscaling-inference-and-alignment":4239,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fseq2seq-pretraining-and-bart":4240,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Ftext-to-text-transfer-and-conditional-generation":4241,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fspeech-and-audio-models":4242,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fself-supervised-speech-and-synthesis":4243,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fai-agents":3927,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fagent-memory-retrieval-and-orchestration":4244,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fmixture-of-experts":4245,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fmultimodal-models":4246,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Ffusion-and-vision-language-models":4247,"\u002Fdeep-learning\u002Freinforcement-learning\u002Ffoundations-of-reinforcement-learning":3964,"\u002Fdeep-learning\u002Freinforcement-learning\u002Fmodel-free-prediction-and-control":4248,"\u002Fdeep-learning\u002Freinforcement-learning\u002Fdeep-q-networks":4249,"\u002Fdeep-learning\u002Freinforcement-learning\u002Fpolicy-gradients-and-actor-critic":4250,"\u002Fdeep-learning\u002Freinforcement-learning\u002Frl-from-human-feedback":4251,"\u002Fdeep-learning":3924,"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fequilibrium-state-variables-zeroth-law":4252,"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Ffirst-law-heat-and-work":4049,"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fsecond-law-entropy-and-the-carnot-bound":4253,"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fthermodynamic-potentials-and-maxwell-relations":4254,"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fstability-response-functions-and-the-third-law":4255,"\u002Fstatistical-mechanics\u002Ffoundations\u002Fclassical-statistics-and-equipartition":4256,"\u002Fstatistical-mechanics\u002Ffoundations\u002Fphase-space-and-liouvilles-theorem":4257,"\u002Fstatistical-mechanics\u002Ffoundations\u002Fensembles-and-the-equal-probability-postulate":4258,"\u002Fstatistical-mechanics\u002Ffoundations\u002Fstatistical-entropy-boltzmann-and-gibbs":4259,"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Fmicrocanonical-ensemble-and-entropy":4260,"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Fequilibrium-conditions-temperature-pressure-chemical-potential":4096,"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Fideal-gas-phase-space-and-the-sackur-tetrode-entropy":4261,"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Ftwo-state-systems-paramagnets-and-negative-temperature":4262,"\u002Fstatistical-mechanics\u002Fcanonical\u002Fcanonical-ensemble-and-the-boltzmann-distribution":4263,"\u002Fstatistical-mechanics\u002Fcanonical\u002Fpartition-function-and-the-helmholtz-free-energy":3983,"\u002Fstatistical-mechanics\u002Fcanonical\u002Fenergy-fluctuations-and-ensemble-equivalence":3776,"\u002Fstatistical-mechanics\u002Fcanonical\u002Fthe-einstein-solid-and-harmonic-systems":4264,"\u002Fstatistical-mechanics\u002Fcanonical\u002Fparamagnetism-and-the-schottky-anomaly":4265,"\u002Fstatistical-mechanics\u002Fclassical-gas\u002Fideal-gas-partition-function-and-the-gibbs-paradox":4266,"\u002Fstatistical-mechanics\u002Fclassical-gas\u002Fequipartition-and-the-virial-theorem":3910,"\u002Fstatistical-mechanics\u002Fclassical-gas\u002Fmolecular-gases-rotation-and-vibration":4267,"\u002Fstatistical-mechanics\u002Fgrand-canonical\u002Fgrand-canonical-ensemble-and-the-grand-partition-function":4268,"\u002Fstatistical-mechanics\u002Fgrand-canonical\u002Fchemical-potential-fugacity-and-number-fluctuations":3988,"\u002Fstatistical-mechanics\u002Fgrand-canonical\u002Fensemble-summary-and-the-thermodynamic-web":3915,"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fquantum-statistics-bose-einstein-and-fermi-dirac":4269,"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fderiving-the-quantum-distributions":3884,"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fthe-classical-limit-and-quantum-concentration":3754,"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fideal-quantum-gases-general-framework":3770,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fbose-einstein-condensation-and-the-fermion-gas":4270,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fthe-photon-gas-and-plancks-radiation-law":4271,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fblackbody-thermodynamics-and-radiation-pressure":4272,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fphonons-and-the-debye-model":3902,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fbose-einstein-condensation-derived":4273,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fthermodynamics-of-the-bose-gas-and-superfluidity":3764,"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fthe-ideal-fermi-gas-at-zero-temperature":4274,"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fsommerfeld-expansion-and-electrons-in-metals":4275,"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fwhite-dwarfs-and-the-chandrasekhar-limit":4276,"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fneutron-stars-and-nuclear-matter":4277,"\u002Fstatistical-mechanics\u002Finteractions\u002Fthe-cluster-expansion-and-virial-coefficients":4098,"\u002Fstatistical-mechanics\u002Finteractions\u002Fthe-van-der-waals-gas-and-liquid-gas-coexistence":4278,"\u002Fstatistical-mechanics\u002Finteractions\u002Fquantum-gases-with-interactions-and-exchange":4279,"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fphases-coexistence-and-classification":4280,"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fthe-ising-model-and-exact-solutions":4281,"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fmean-field-theory-and-the-weiss-model":4044,"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fcritical-exponents-and-landau-theory":4282,"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fthe-renormalization-group-idea":4022,"\u002Fstatistical-mechanics\u002Ffluctuations\u002Fthermodynamic-fluctuations-and-response":4283,"\u002Fstatistical-mechanics\u002Ffluctuations\u002Fbrownian-motion-and-the-langevin-equation":3883,"\u002Fstatistical-mechanics\u002Ffluctuations\u002Flinear-response-and-the-fluctuation-dissipation-theorem":4284,"\u002Fstatistical-mechanics":4285,"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fbonding-mechanisms":4286,"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fmolecular-orbitals-and-h2-plus":3749,"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fhydrogen-molecule-and-exchange":4009,"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fvan-der-waals-forces":4287,"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Frotational-vibrational-spectra":4288,"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Fanharmonicity-and-rovibrational-structure":4289,"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Framan-and-electronic-bands":4290,"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Flasers-and-masers":4291,"\u002Fcondensed-matter\u002Fcrystal-structure\u002Fstructure-of-solids":4292,"\u002Fcondensed-matter\u002Fcrystal-structure\u002Fbravais-lattices-and-crystal-systems":3882,"\u002Fcondensed-matter\u002Fcrystal-structure\u002Freciprocal-lattice-and-brillouin-zones":4293,"\u002Fcondensed-matter\u002Fcrystal-structure\u002Fdiffraction-and-structure-factors":4294,"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fphonon-dispersion":4295,"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fphonons-quantization-and-dos":4296,"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fdebye-einstein-heat-capacity":4025,"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fanharmonicity-and-thermal-transport":4297,"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Ffree-electron-gas-and-conduction":4298,"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Fsommerfeld-model-and-heat-capacity":4299,"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Ftransport-and-the-hall-effect":4300,"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Fscreening-and-plasmons":4301,"\u002Fcondensed-matter\u002Fband-theory\u002Fblochs-theorem-and-energy-bands":4080,"\u002Fcondensed-matter\u002Fband-theory\u002Fnearly-free-electron-model":4024,"\u002Fcondensed-matter\u002Fband-theory\u002Ftight-binding-method":4302,"\u002Fcondensed-matter\u002Fband-theory\u002Ffermi-surfaces-and-semiclassical-dynamics":4303,"\u002Fcondensed-matter\u002Fsemiconductors\u002Fsemiconductor-bands-and-junctions":4304,"\u002Fcondensed-matter\u002Fsemiconductors\u002Fintrinsic-and-extrinsic-semiconductors":4305,"\u002Fcondensed-matter\u002Fsemiconductors\u002Fcarrier-transport-and-recombination":4015,"\u002Fcondensed-matter\u002Fsemiconductors\u002Fthe-pn-junction":4306,"\u002Fcondensed-matter\u002Fsemiconductors\u002Ftransistors-and-optoelectronics":4307,"\u002Fcondensed-matter\u002Fdielectrics-and-ferroelectrics\u002Fdielectrics-and-polarization":4252,"\u002Fcondensed-matter\u002Fdielectrics-and-ferroelectrics\u002Fferroelectrics-and-piezoelectrics":4152,"\u002Fcondensed-matter\u002Fmagnetism\u002Fdiamagnetism-and-paramagnetism":3879,"\u002Fcondensed-matter\u002Fmagnetism\u002Fexchange-and-ferromagnetism":4308,"\u002Fcondensed-matter\u002Fmagnetism\u002Fantiferromagnetism-and-domains":3745,"\u002Fcondensed-matter\u002Fmagnetism\u002Fspin-waves-and-magnons":4309,"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fsuperconductivity-phenomenology":4310,"\u002Fcondensed-matter\u002Fsuperconductivity\u002Flondon-theory-and-the-meissner-effect":3890,"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fginzburg-landau-theory":4311,"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fbcs-theory":4145,"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fjosephson-and-high-tc":4312,"\u002Fcondensed-matter\u002Fnanostructures\u002Fquantum-wells-wires-and-dots":3737,"\u002Fcondensed-matter\u002Fnanostructures\u002Finteger-quantum-hall-effect":4313,"\u002Fcondensed-matter\u002Fnanostructures\u002Ffractional-quantum-hall-and-topology":3748,"\u002Fcondensed-matter\u002Fnanostructures\u002Fgraphene-and-dirac-materials":4314,"\u002Fcondensed-matter":4065,"\u002Flogic\u002Ffoundations\u002Flogic-as-a-mathematical-model":4315,"\u002Flogic\u002Fsentential-logic\u002Fformal-languages-and-well-formed-formulas":4316,"\u002Flogic\u002Fsentential-logic\u002Ftruth-assignments-and-tautologies":4317,"\u002Flogic\u002Fsentential-logic\u002Funique-readability-and-parsing":4318,"\u002Flogic\u002Fsentential-logic\u002Finduction-and-recursion":3762,"\u002Flogic\u002Fsentential-logic\u002Fexpressive-completeness-and-normal-forms":4319,"\u002Flogic\u002Fsentential-logic\u002Fboolean-circuits":4320,"\u002Flogic\u002Fsentential-logic\u002Fcompactness-and-effectiveness":3762,"\u002Flogic\u002Ffirst-order-languages\u002Ffirst-order-languages":4321,"\u002Flogic\u002Ffirst-order-languages\u002Fstructures-truth-and-satisfaction":4175,"\u002Flogic\u002Ffirst-order-languages\u002Fdefinability-and-elementary-equivalence":4322,"\u002Flogic\u002Ffirst-order-languages\u002Fterms-substitution-and-parsing":4323,"\u002Flogic\u002Fdeductive-calculus\u002Fa-deductive-calculus":4324,"\u002Flogic\u002Fdeductive-calculus\u002Fdeduction-theorem-and-derived-rules":4322,"\u002Flogic\u002Fdeductive-calculus\u002Fsoundness":4325,"\u002Flogic\u002Fdeductive-calculus\u002Fcompleteness-and-consistency":4326,"\u002Flogic\u002Fmodels-and-theories\u002Fcompactness-and-lowenheim-skolem":4327,"\u002Flogic\u002Fmodels-and-theories\u002Ftheories-elementary-classes-and-categoricity":4328,"\u002Flogic\u002Fmodels-and-theories\u002Finterpretations-between-theories":4329,"\u002Flogic\u002Fmodels-and-theories\u002Fnonstandard-analysis":4330,"\u002Flogic\u002Farithmetic-and-definability\u002Fdefinability-in-arithmetic":4331,"\u002Flogic\u002Farithmetic-and-definability\u002Fnatural-numbers-with-successor":4332,"\u002Flogic\u002Farithmetic-and-definability\u002Fpresburger-and-reducts":4253,"\u002Flogic\u002Farithmetic-and-definability\u002Fa-subtheory-and-representability":4333,"\u002Flogic\u002Fincompleteness\u002Farithmetization-of-syntax":4326,"\u002Flogic\u002Fincompleteness\u002Fincompleteness-and-undecidability":4334,"\u002Flogic\u002Fincompleteness\u002Fsecond-incompleteness-theorem":4335,"\u002Flogic\u002Fcomputability-and-representability\u002Frecursive-functions":3968,"\u002Flogic\u002Fcomputability-and-representability\u002Frepresenting-exponentiation":4336,"\u002Flogic\u002Fsecond-order-logic\u002Fsecond-order-languages":4153,"\u002Flogic\u002Fsecond-order-logic\u002Fskolem-functions-and-many-sorted-logic":4337,"\u002Flogic\u002Fsecond-order-logic\u002Fgeneral-structures":4338,"\u002Flogic":4339,"\u002Freinforcement-learning\u002Ffoundations\u002Fwhat-is-reinforcement-learning":4340,"\u002Freinforcement-learning\u002Ffoundations\u002Fa-brief-history-of-rl":4341,"\u002Freinforcement-learning\u002Ffoundations\u002Fmulti-armed-bandits":3954,"\u002Freinforcement-learning\u002Ffoundations\u002Fbandit-exploration-algorithms":4342,"\u002Freinforcement-learning\u002Ffoundations\u002Fmarkov-decision-processes":4343,"\u002Freinforcement-learning\u002Ffoundations\u002Fvalue-functions-and-optimality":4344,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fdynamic-programming":4345,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fdp-async-and-gpi":4335,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fmonte-carlo-methods":4346,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fmonte-carlo-off-policy":4347,"\u002Freinforcement-learning\u002Ftabular-methods\u002Ftemporal-difference-learning":4348,"\u002Freinforcement-learning\u002Ftabular-methods\u002Ftd-control-sarsa-and-q-learning":4246,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fn-step-bootstrapping":4349,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fn-step-off-policy-methods":4350,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fplanning-and-learning":4351,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fplanning-focusing-and-decision-time":4352,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fdecision-time-planning":4353,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fmonte-carlo-tree-search":3971,"\u002Freinforcement-learning\u002Fapproximation\u002Fon-policy-prediction":4354,"\u002Freinforcement-learning\u002Fapproximation\u002Ffeature-construction-and-nonlinear":4355,"\u002Freinforcement-learning\u002Fapproximation\u002Fon-policy-control":4356,"\u002Freinforcement-learning\u002Fapproximation\u002Faverage-reward-control":4357,"\u002Freinforcement-learning\u002Fapproximation\u002Foff-policy-and-the-deadly-triad":4162,"\u002Freinforcement-learning\u002Fapproximation\u002Fbellman-error-and-gradient-td":4358,"\u002Freinforcement-learning\u002Fapproximation\u002Feligibility-traces":4334,"\u002Freinforcement-learning\u002Fapproximation\u002Ftrue-online-and-sarsa-lambda":4359,"\u002Freinforcement-learning\u002Fapproximation\u002Fpolicy-gradient-methods":4360,"\u002Freinforcement-learning\u002Fapproximation\u002Factor-critic-and-continuous-actions":4361,"\u002Freinforcement-learning\u002Fapproximation\u002Fleast-squares-and-memory-based-methods":3982,"\u002Freinforcement-learning\u002Fapproximation\u002Fmemory-and-kernel-methods":4362,"\u002Freinforcement-learning\u002Fapproximation\u002Foff-policy-eligibility-traces":4112,"\u002Freinforcement-learning\u002Fapproximation\u002Fstable-off-policy-traces":4363,"\u002Freinforcement-learning\u002Fdeep-rl\u002Fdeep-q-networks":4364,"\u002Freinforcement-learning\u002Fdeep-rl\u002Fdqn-improvements":3944,"\u002Freinforcement-learning\u002Fdeep-rl\u002Factor-critic-and-ppo":4365,"\u002Freinforcement-learning\u002Fdeep-rl\u002Fppo-and-continuous-control":4366,"\u002Freinforcement-learning\u002Fdeep-rl\u002Fcase-studies":4367,"\u002Freinforcement-learning\u002Fdeep-rl\u002Frl-beyond-games":4368,"\u002Freinforcement-learning\u002Fdeep-rl\u002Ffrontiers":4369,"\u002Freinforcement-learning\u002Fdeep-rl\u002Freward-design-and-open-problems":4222,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fdistributional-and-rainbow":4370,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fdistributional-and-rainbow-part-2":4371,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fcontinuous-control":4372,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fcontinuous-control-part-2":4257,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmodel-based-rl":4373,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmodel-based-rl-part-2":4374,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fexploration":4375,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fexploration-part-2":3971,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Foffline-rl":4038,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Foffline-rl-part-2":4376,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fimitation-and-inverse-rl":4377,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fimitation-and-inverse-rl-part-2":4378,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmulti-agent-rl":4379,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmulti-agent-rl-part-2":4380,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fhierarchical-rl":4381,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fhierarchical-rl-part-2":4382,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Frlhf-and-language-models":4383,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fpartial-observability-pomdps":4384,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fpartial-observability-pomdps-part-2":4385,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fsafe-and-constrained-rl":4386,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fsafe-and-constrained-rl-part-2":4387,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmeta-rl-and-generalization":4388,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fpsychology-of-reinforcement":4389,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Finstrumental-conditioning-and-control":4390,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fdopamine-and-td-error":4391,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fdopamine-in-the-brain":4392,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fanimal-learning-and-cognition":4393,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fcognitive-maps-and-planning":4394,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fneuroscience-of-reinforcement":4395,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fseveral-learning-systems":4396,"\u002Freinforcement-learning":3924,"\u002Fartificial-intelligence\u002Ffoundations\u002Fwhat-is-ai":4397,"\u002Fartificial-intelligence\u002Ffoundations\u002Ffoundations-of-ai":4398,"\u002Fartificial-intelligence\u002Ffoundations\u002Fintelligent-agents":4399,"\u002Fartificial-intelligence\u002Ffoundations\u002Fagent-architectures":4400,"\u002Fartificial-intelligence\u002Fsearch\u002Funinformed-search":4401,"\u002Fartificial-intelligence\u002Fsearch\u002Fsearch-strategies-compared":4402,"\u002Fartificial-intelligence\u002Fsearch\u002Finformed-search":4403,"\u002Fartificial-intelligence\u002Fsearch\u002Fheuristic-functions":4404,"\u002Fartificial-intelligence\u002Fsearch\u002Flocal-search":4405,"\u002Fartificial-intelligence\u002Fsearch\u002Fpopulation-and-continuous-search":4406,"\u002Fartificial-intelligence\u002Fsearch\u002Fadversarial-search":4407,"\u002Fartificial-intelligence\u002Fsearch\u002Fgames-of-chance-and-imperfect-information":4408,"\u002Fartificial-intelligence\u002Fsearch\u002Fconstraint-satisfaction":4409,"\u002Fartificial-intelligence\u002Fsearch\u002Fcsp-search-and-structure":4251,"\u002Fartificial-intelligence\u002Fsearch\u002Fsearch-under-uncertainty":4106,"\u002Fartificial-intelligence\u002Fsearch\u002Fbelief-state-and-online-search":4410,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fpropositional-logic":4411,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fpropositional-inference":4412,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Ffirst-order-logic":4413,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Ffirst-order-logic-in-use":4414,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Finference-and-resolution":4415,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Ffirst-order-resolution":4233,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fclassical-planning":4416,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fplanning-graphs-and-graphplan":4417,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fplanning-in-the-real-world":4418,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fplanning-under-uncertainty":4419,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fknowledge-representation":4420,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Freasoning-systems-and-defaults":4421,"\u002Fartificial-intelligence\u002Funcertainty\u002Fprobability-and-bayes":4422,"\u002Fartificial-intelligence\u002Funcertainty\u002Fbayes-rule-and-naive-bayes":4423,"\u002Fartificial-intelligence\u002Funcertainty\u002Fbayesian-networks":4424,"\u002Fartificial-intelligence\u002Funcertainty\u002Finference-in-bayesian-networks":4425,"\u002Fartificial-intelligence\u002Funcertainty\u002Freasoning-over-time":4426,"\u002Fartificial-intelligence\u002Funcertainty\u002Ftracking-and-data-association":4427,"\u002Fartificial-intelligence\u002Funcertainty\u002Fmaking-decisions":4165,"\u002Fartificial-intelligence\u002Funcertainty\u002Fmarkov-decision-processes":4417,"\u002Fartificial-intelligence\u002Funcertainty\u002Fdecision-networks-and-game-theory":4428,"\u002Fartificial-intelligence\u002Funcertainty\u002Fgame-theory-and-mechanism-design":3705,"\u002Fartificial-intelligence\u002Flearning\u002Flearning-from-examples":4429,"\u002Fartificial-intelligence\u002Flearning\u002Ftheory-and-model-families":4430,"\u002Fartificial-intelligence\u002Flearning\u002Fprobabilistic-learning":4431,"\u002Fartificial-intelligence\u002Flearning\u002Fexpectation-maximization":4432,"\u002Fartificial-intelligence\u002Flearning\u002Freinforcement-learning":4433,"\u002Fartificial-intelligence\u002Flearning\u002Fgeneralization-and-policy-search":4214,"\u002Fartificial-intelligence\u002Flearning\u002Fknowledge-in-learning":4434,"\u002Fartificial-intelligence\u002Flearning\u002Fknowledge-based-learning-methods":4435,"\u002Fartificial-intelligence\u002Ffrontiers\u002Fvision-and-perception":4436,"\u002Fartificial-intelligence\u002Ffrontiers\u002Freconstructing-the-3d-world":4437,"\u002Fartificial-intelligence\u002Ffrontiers\u002Frobotics":4438,"\u002Fartificial-intelligence\u002Ffrontiers\u002Frobot-planning-and-control":4439,"\u002Fartificial-intelligence\u002Ffrontiers\u002Fnatural-language-in-ai":4440,"\u002Fartificial-intelligence\u002Ffrontiers\u002Fnlp-grammar-translation-and-speech":4441,"\u002Fartificial-intelligence\u002Ffrontiers\u002Fphilosophy-and-future":4442,"\u002Fartificial-intelligence\u002Ffrontiers\u002Fai-ethics-and-future":4443,"\u002Fartificial-intelligence":3924,"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-constituents-nuclide-chart":4181,"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-size-charge-distributions":4444,"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-masses-binding-energy":3741,"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fsemi-empirical-mass-formula":3739,"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-moments-multipoles":4275,"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fnuclear-force-shell-overview":4445,"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fthe-deuteron":3767,"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fnucleon-nucleon-scattering":4077,"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fmeson-theory-isospin":4446,"\u002Fnuclear-physics\u002Fnuclear-models\u002Ffermi-gas-model":4447,"\u002Fnuclear-physics\u002Fnuclear-models\u002Fliquid-drop-collective-coordinates":4448,"\u002Fnuclear-physics\u002Fnuclear-models\u002Fshell-model-single-particle":4137,"\u002Fnuclear-physics\u002Fnuclear-models\u002Fcollective-model-rotations-vibrations":4449,"\u002Fnuclear-physics\u002Fradioactive-decay\u002Fdecay-law-modes":4450,"\u002Fnuclear-physics\u002Fradioactive-decay\u002Fdecay-kinetics-equilibrium":4451,"\u002Fnuclear-physics\u002Falpha-decay\u002Falpha-decay-gamow-theory":4336,"\u002Fnuclear-physics\u002Falpha-decay\u002Falpha-fine-structure-hindrance":4452,"\u002Fnuclear-physics\u002Fbeta-decay\u002Fbeta-decay-energetics-neutrino":4453,"\u002Fnuclear-physics\u002Fbeta-decay\u002Ffermi-theory-beta-decay":3751,"\u002Fnuclear-physics\u002Fbeta-decay\u002Fweak-interaction-parity-violation":3980,"\u002Fnuclear-physics\u002Fbeta-decay\u002Fdouble-beta-decay-neutrino-mass":4454,"\u002Fnuclear-physics\u002Fgamma-decay\u002Fgamma-multipole-radiation":4081,"\u002Fnuclear-physics\u002Fgamma-decay\u002Finternal-conversion-isomers":4455,"\u002Fnuclear-physics\u002Fgamma-decay\u002Fangular-correlations-mossbauer":4456,"\u002Fnuclear-physics\u002Fnuclear-reactions\u002Freaction-kinematics-cross-sections":3976,"\u002Fnuclear-physics\u002Fnuclear-reactions\u002Fcompound-nucleus-resonances":4064,"\u002Fnuclear-physics\u002Fnuclear-reactions\u002Fdirect-reactions-optical-model":4457,"\u002Fnuclear-physics\u002Ffission\u002Ffission-barrier-dynamics":4458,"\u002Fnuclear-physics\u002Ffission\u002Fchain-reactions-reactor-physics":4459,"\u002Fnuclear-physics\u002Ffusion-nucleosynthesis\u002Ffusion-reactions-confinement":3746,"\u002Fnuclear-physics\u002Ffusion-nucleosynthesis\u002Fstellar-nucleosynthesis":4121,"\u002Fnuclear-physics\u002Ffusion-nucleosynthesis\u002Fbig-bang-nucleosynthesis":3983,"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fcharged-particle-stopping-power":4460,"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fphoton-neutron-interactions":4031,"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fradiation-detectors":4095,"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fdosimetry-radiation-biology":4461,"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fnuclear-applications-dating-medicine":4462,"\u002Fnuclear-physics":4463,"\u002Fnatural-language-processing\u002Ffoundations\u002Fwhat-is-nlp":4464,"\u002Fnatural-language-processing\u002Ffoundations\u002Fregex-and-text-normalization":3637,"\u002Fnatural-language-processing\u002Ffoundations\u002Fminimum-edit-distance":4102,"\u002Fnatural-language-processing\u002Ffoundations\u002Fn-gram-language-models":4465,"\u002Fnatural-language-processing\u002Ffoundations\u002Fsmoothing-and-backoff":4466,"\u002Fnatural-language-processing\u002Fclassification\u002Fnaive-bayes-and-sentiment":4467,"\u002Fnatural-language-processing\u002Fclassification\u002Fevaluating-classifiers":3950,"\u002Fnatural-language-processing\u002Fclassification\u002Flogistic-regression":4468,"\u002Fnatural-language-processing\u002Fclassification\u002Fsentiment-and-affect-lexicons":4469,"\u002Fnatural-language-processing\u002Fsemantics\u002Fvector-semantics-and-embeddings":4247,"\u002Fnatural-language-processing\u002Fsemantics\u002Fstatic-word-embeddings":4470,"\u002Fnatural-language-processing\u002Fsemantics\u002Fneural-language-models":4416,"\u002Fnatural-language-processing\u002Fsequences\u002Fsequence-labeling":4471,"\u002Fnatural-language-processing\u002Fsequences\u002Fcrfs-and-neural-taggers":4472,"\u002Fnatural-language-processing\u002Fsequences\u002Frnns-and-lstms":4473,"\u002Fnatural-language-processing\u002Ftransformers\u002Ftransformers-and-attention":4474,"\u002Fnatural-language-processing\u002Ftransformers\u002Fthe-transformer-architecture":4475,"\u002Fnatural-language-processing\u002Ftransformers\u002Flarge-language-models":4476,"\u002Fnatural-language-processing\u002Ftransformers\u002Fllm-pretraining-and-scaling":4477,"\u002Fnatural-language-processing\u002Ftransformers\u002Ffine-tuning-and-prompting":3928,"\u002Fnatural-language-processing\u002Ftransformers\u002Fprompting-and-alignment":4478,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fconstituency-parsing":4479,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcky-scoring-and-evaluation":4422,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fdependency-parsing":4480,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fgraph-based-and-neural-dependency-parsing":4481,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fword-senses-and-wsd":4482,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fwsd-in-practice-and-induction":4483,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fsemantic-roles-and-information-extraction":4484,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Frelations-events-and-templates":4485,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcoreference-and-discourse":4486,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcoherence-and-discourse-structure":4487,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Flogical-semantics":4346,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcompositional-semantics-and-description-logics":4488,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fsemantic-parsing":4489,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fneural-semantic-parsing":4490,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Finformation-extraction":4491,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Ftimes-events-and-templates":4492,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fdiscourse-coherence":4493,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fentity-based-and-global-coherence":4494,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fconstituency-grammars":4495,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Ftreebanks-and-lexicalized-grammars":4496,"\u002Fnatural-language-processing\u002Fapplications\u002Fmachine-translation":4497,"\u002Fnatural-language-processing\u002Fapplications\u002Fmachine-translation-decoding-and-evaluation":4498,"\u002Fnatural-language-processing\u002Fapplications\u002Fquestion-answering":4499,"\u002Fnatural-language-processing\u002Fapplications\u002Fquestion-answering-knowledge-and-llms":4200,"\u002Fnatural-language-processing\u002Fapplications\u002Fdialogue-and-chatbots":4367,"\u002Fnatural-language-processing\u002Fapplications\u002Fdialogue-systems-and-assistants":3956,"\u002Fnatural-language-processing\u002Fapplications\u002Ftext-summarization":4500,"\u002Fnatural-language-processing\u002Fapplications\u002Fabstractive-summarization-and-evaluation":4501,"\u002Fnatural-language-processing\u002Fspeech\u002Fphonetics":4502,"\u002Fnatural-language-processing\u002Fspeech\u002Facoustic-phonetics":4503,"\u002Fnatural-language-processing\u002Fspeech\u002Fautomatic-speech-recognition":4214,"\u002Fnatural-language-processing\u002Fspeech\u002Fasr-evaluation-and-applications":4504,"\u002Fnatural-language-processing":3924,"\u002Fparticle-physics\u002Ffoundations\u002Fhistorical-overview-particle-zoo":4505,"\u002Fparticle-physics\u002Ffoundations\u002Fparticle-physics-basic-concepts":4122,"\u002Fparticle-physics\u002Ffoundations\u002Ffundamental-interactions-force-carriers":4506,"\u002Fparticle-physics\u002Funits-kinematics\u002Fnatural-units-and-scales":4267,"\u002Fparticle-physics\u002Funits-kinematics\u002Ffour-vectors-invariant-mass":4507,"\u002Fparticle-physics\u002Funits-kinematics\u002Fdecay-scattering-kinematics-mandelstam":4508,"\u002Fparticle-physics\u002Funits-kinematics\u002Fcross-sections-golden-rule":4457,"\u002Fparticle-physics\u002Fsymmetries\u002Fconservation-laws-symmetries":4509,"\u002Fparticle-physics\u002Fsymmetries\u002Fdiscrete-symmetries-cpt":4510,"\u002Fparticle-physics\u002Fsymmetries\u002Fparity-violation-weak":4072,"\u002Fparticle-physics\u002Fsymmetries\u002Fsu2-su3-flavor-symmetry":3774,"\u002Fparticle-physics\u002Fquark-model\u002Feightfold-way-su3":4511,"\u002Fparticle-physics\u002Fquark-model\u002Fmeson-spectroscopy":4026,"\u002Fparticle-physics\u002Fquark-model\u002Fbaryon-spectroscopy":4512,"\u002Fparticle-physics\u002Fquark-model\u002Fcolor-confinement-exotics":4059,"\u002Fparticle-physics\u002Frelativistic-wave-equations\u002Fklein-gordon-equation":4513,"\u002Fparticle-physics\u002Frelativistic-wave-equations\u002Fdirac-equation-spinors":4313,"\u002Fparticle-physics\u002Frelativistic-wave-equations\u002Fantiparticles-hole-theory":4514,"\u002Fparticle-physics\u002Fqed\u002Ffeynman-rules-qed":4515,"\u002Fparticle-physics\u002Fqed\u002Fqed-tree-processes":4282,"\u002Fparticle-physics\u002Fqed\u002Frenormalization-running-coupling":4516,"\u002Fparticle-physics\u002Fqed\u002Felectron-g-2":3745,"\u002Fparticle-physics\u002Fweak-interaction\u002Fva-structure-weak":4517,"\u002Fparticle-physics\u002Fweak-interaction\u002Fw-z-bosons-decays":4518,"\u002Fparticle-physics\u002Fweak-interaction\u002Fckm-matrix":4519,"\u002Fparticle-physics\u002Fweak-interaction\u002Fcp-violation-kaons-b-mesons":4063,"\u002Fparticle-physics\u002Fqcd\u002Fcolor-su3-gluons":4279,"\u002Fparticle-physics\u002Fqcd\u002Fasymptotic-freedom-confinement":4520,"\u002Fparticle-physics\u002Fqcd\u002Fdeep-inelastic-scattering-partons":4521,"\u002Fparticle-physics\u002Fqcd\u002Fjets-hadronization":4138,"\u002Fparticle-physics\u002Felectroweak-higgs\u002Felectroweak-su2-u1":4522,"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fspontaneous-symmetry-breaking":4183,"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fhiggs-mechanism":4523,"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fhiggs-boson-discovery":4524,"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fstandard-model":4072,"\u002Fparticle-physics\u002Fneutrinos\u002Fneutrino-oscillations":4105,"\u002Fparticle-physics\u002Fneutrinos\u002Fneutrino-mass-pmns":4525,"\u002Fparticle-physics\u002Fneutrinos\u002Fdirac-majorana-experiments":4526,"\u002Fparticle-physics\u002Fexperiment\u002Faccelerators-luminosity":4527,"\u002Fparticle-physics\u002Fexperiment\u002Fdetectors-subsystems":4161,"\u002Fparticle-physics\u002Fexperiment\u002Fhow-discoveries-are-made":4528,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fbeyond-standard-model":3902,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fgrand-unified-theories":4529,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fsupersymmetry":4005,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fhierarchy-problem-naturalness":4530,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fdark-matter-candidates":4531,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fmatter-antimatter-open-questions":4329,"\u002Fparticle-physics":4532,"\u002Fastrophysics-cosmology\u002Forientation\u002Fthe-sun-and-stars":4123,"\u002Fastrophysics-cosmology\u002Forientation\u002Fstellar-death-final-states":4277,"\u002Fastrophysics-cosmology\u002Forientation\u002Fgalaxies-and-cosmology":4533,"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Fmagnitudes-fluxes-and-the-distance-modulus":4062,"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Fstellar-spectra-and-spectral-classification":4534,"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Ftelescopes-and-detectors-across-the-spectrum":4122,"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Fthe-cosmic-distance-ladder":4034,"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fblackbody-radiation-and-specific-intensity":4535,"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fradiative-transfer-and-the-transfer-equation":4536,"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fspectral-line-formation-and-broadening":4537,"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fopacity-and-the-rosseland-mean":4538,"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fhydrostatic-equilibrium-and-the-virial-theorem":4539,"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fthe-equations-of-stellar-structure":4328,"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fthe-equation-of-state-and-polytropes":4259,"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fthe-standard-solar-model":4540,"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fthermonuclear-reaction-rates-and-the-gamow-peak":4541,"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fhydrogen-burning-pp-chains-and-cno":4542,"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fhelium-burning-and-the-triple-alpha-process":4543,"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fadvanced-burning-and-neutron-capture-nucleosynthesis":4456,"\u002Fastrophysics-cosmology\u002Fism-and-star-formation\u002Fphases-of-the-interstellar-medium":4544,"\u002Fastrophysics-cosmology\u002Fism-and-star-formation\u002Fmolecular-clouds-and-gravitational-collapse":4018,"\u002Fastrophysics-cosmology\u002Fism-and-star-formation\u002Fprotostars-and-the-pre-main-sequence":4081,"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fthe-main-sequence-and-its-structure":4063,"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fpost-main-sequence-low-mass-evolution":4545,"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fthe-evolution-of-massive-stars":4147,"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fstellar-pulsation-and-the-instability-strip":3763,"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fwhite-dwarfs-and-the-chandrasekhar-limit":4546,"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fcore-collapse-supernovae":4547,"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fthermonuclear-supernovae-type-ia":4278,"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fneutron-stars-and-pulsars":4548,"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fblack-holes-schwarzschild-and-kerr":4549,"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Fbinary-systems-and-mass-transfer":4550,"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Faccreting-compact-objects":4551,"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Fgravitational-waves-from-inspiraling-binaries":3744,"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Fmultimessenger-astronomy-and-gamma-ray-bursts":4552,"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fthe-milky-way":4553,"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fgalaxy-morphology-and-classification":4005,"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fgalaxy-rotation-curves-and-dark-matter":4554,"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Factive-galactic-nuclei-and-supermassive-black-holes":4555,"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fgalaxy-clusters-and-large-scale-structure":4271,"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fthe-expanding-universe-and-hubbles-law":3926,"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fthe-frw-metric-and-cosmological-redshift":4556,"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fthe-friedmann-equations-and-cosmic-dynamics":4557,"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fcosmological-models-and-distances":4183,"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fdark-energy-and-the-accelerating-universe":4169,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fthe-thermal-history-of-the-universe":4181,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fbig-bang-nucleosynthesis":4278,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Frecombination-and-the-cosmic-microwave-background":4558,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fcmb-anisotropies-and-cosmological-parameters":3743,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fcosmic-inflation":3935,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fstructure-formation-and-the-growth-of-perturbations":4559,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fdark-matter-dark-energy-and-open-questions":4022,"\u002Fastrophysics-cosmology":4127,"\u002Fcolophon":4560,"\u002F":3924},4250,4808,3626,2682,4109,4786,3878,3875,3751,3415,4067,3153,3000,4042,5461,5808,3961,3749,4327,5067,4246,4655,4154,5436,2640,4003,3601,2158,4331,4189,2273,3252,4633,4964,4172,3131,5524,3160,4031,2309,4207,3226,2648,4842,5340,3307,5701,4977,4039,2615,3472,4460,3848,4075,4400,3382,3010,3602,3737,3740,3707,3922,5191,4043,3804,4542,4214,5062,2850,4361,3443,3627,4044,3766,4140,3860,4006,5199,4334,5234,3651,5509,5680,153,1375,1073,1093,1125,1146,1014,1132,876,1541,1189,1173,984,1402,1301,950,1268,1063,1107,1408,1161,925,1012,866,964,1090,1142,1085,1020,1207,973,980,728,764,1225,1329,796,929,801,878,774,1044,1488,1175,1130,890,814,870,154,4073,5140,4961,5127,4870,5382,5195,4955,5369,4501,5576,3824,4132,4289,4307,4570,3403,5084,5105,5201,5116,5341,5175,5368,5188,5211,5499,5155,4981,5125,5415,5255,5304,5130,5167,5552,5164,5094,5239,5036,5190,5004,5099,5035,5159,5088,5026,4937,5023,5264,5244,133,5114,5078,5043,5312,5170,5342,5139,5151,5049,5212,5013,5068,5079,5102,5121,5081,5029,5379,5854,5110,2139,3798,5055,5364,4984,4935,4895,4972,5289,5112,5156,4987,5031,5025,5149,5302,5042,5002,4979,4922,4960,5279,126,1877,1180,1129,907,958,1112,1300,1053,1250,1181,1241,1234,966,1050,734,1190,484,1082,926,733,761,571,607,798,804,952,977,731,784,645,771,1017,742,1004,1000,1562,1254,1288,1101,1011,1486,1061,856,992,1169,988,137,0,2037,1782,2384,2254,2123,2332,1643,1714,2089,1751,1367,1660,2511,1998,1892,1854,1791,2438,2487,1917,2375,2525,2266,1845,2275,1810,1631,2310,2166,2233,2113,2505,2347,2672,2112,2473,2592,2380,3013,2513,3256,3218,2194,2173,2205,2326,2081,3342,3152,1799,1670,1027,960,1095,1291,986,897,1209,1055,1817,1801,1593,1465,1196,1464,1201,1230,1435,1684,1461,1926,1500,1409,1284,1774,1869,162,1487,1122,1188,1001,1351,982,1005,979,1325,1046,943,1279,824,1008,989,1798,1277,1025,987,1043,1211,1074,981,939,1002,739,1139,1108,1013,1070,978,1458,1317,157,1357,1077,2355,1116,1037,1178,1637,1314,1109,1056,1702,1474,1071,1158,832,993,1404,1024,1068,1339,1106,1264,1248,913,1848,1328,1633,1224,1143,135,1378,959,1028,998,911,1527,1203,1266,1483,1165,990,938,965,1257,1418,1099,942,1352,956,1035,1398,1003,1094,1292,138,1721,1827,1449,1354,1148,1184,1285,1281,1213,1290,1271,1252,1274,1778,1591,1503,1437,1571,1584,1957,1117,1781,1648,1342,1667,1510,1965,1607,1365,1849,1259,1303,1356,1238,2208,1564,173,1671,1286,1227,1638,1529,668,1078,918,709,865,880,940,1534,1015,874,922,841,794,1194,822,1105,1658,1359,1296,1438,1921,1844,1570,1429,1324,1400,140,1787,1558,1654,1492,1747,2224,2002,2009,1323,1349,1785,1573,1722,1829,1353,1548,1552,1583,1624,1585,1245,1364,1514,1343,1397,1355,2211,1481,1770,160,2388,2293,2256,2552,2569,2478,2039,2496,2578,2814,2519,2461,2587,2492,2714,3278,2654,3050,2447,2849,2238,2369,2061,2214,2602,2563,2186,2985,2749,3364,2038,2282,2409,2126,2573,2206,2176,2268,2182,2402,2705,2633,2414,2213,2801,3313,3410,3195,1952,2017,1509,2537,2645,2027,2415,2838,2356,1906,3184,2950,2807,2954,1683,1316,1034,1138,1763,1822,1705,1246,1701,1097,1104,1187,1032,1083,1228,916,1489,1033,1652,997,692,837,1023,888,864,1089,1231,1214,1675,1156,1075,1520,1309,139,1205,1051,735,1123,1072,915,567,768,825,1253,983,1007,762,1058,861,862,971,1208,1149,1145,1029,1084,927,810,838,857,807,936,949,2321,1622,1069,1113,1057,854,1958,1528,1618,2049,1432,1679,1796,1685,1346,1275,1476,1505,1610,2018,1599,1215,1838,1909,132,3902,2215,2240,3266,3208,3073,2454,2969,2451,1875,2728,1884,2371,2516,2842,1690,1904,2346,3146,1386,2607,1966,2668,1665,2885,1606,2577,3074,2869,2403,2433,2082,1939,1587,2460,2747,2032,2642,1619,3123,1993,2090,2339,3829,1737,2622,2340,2322,3828,4409,2305,3411,2510,4527,3030,3569,3043,2457,1946,2277,2044,2909,1693,1945,2093,2399,2115,2898,2742,2242,3895,3378,3376,2769,2223,3062,3262,2651,2949,2768,3128,2423,1977,2087,2866,3388,2830,2210,2489,2884,3945,2099,2713,3402,1692,2931,4195,3989,3206,4391,3004,3704,3494,2902,999,881,901,919,748,869,1018,1045,1049,1333,954,1092,1019,976,1771,1480,1396,953,1026,161,3533,1818,3007,2595,3427,3537,2216,1895,2304,3396,1739,2073,1962,2203,1767,2666,2264,2276,2852,1807,3735,1560,4144,1669,1676,1972,2418,3291,1525,2040,2766,2337,2220,2800,3001,2078,1759,2836,1896,2026,1758,1543,1047,896,946,1060,1384,1482,815,1414,1322,1440,1240,1468,1098,1133,847,1009,1381,1052,1191,1258,1370,1712,1441,1199,957,1079,150,1262,1417,1368,1219,1136,1064,1463,1636,1059,931,1115,1736,1174,1376,1363,1411,1247,1746,1313,1299,1617,1102,1076,1495,1265,1193,1263,80,{"\u002Falgorithms\u002Ffoundations\u002Fwhat-is-an-algorithm":4562,"\u002Falgorithms\u002Ffoundations\u002Fproof-techniques":4566,"\u002Falgorithms\u002Ffoundations\u002Fasymptotic-analysis":4570,"\u002Falgorithms\u002Ffoundations\u002Fgrowth-rates-and-loop-analysis":4574,"\u002Falgorithms\u002Ffoundations\u002Frecurrences":4578,"\u002Falgorithms\u002Ffoundations\u002Famortized-analysis":4582,"\u002Falgorithms\u002Fdivide-and-conquer\u002Fmergesort":4586,"\u002Falgorithms\u002Fdivide-and-conquer\u002Fquicksort":4591,"\u002Falgorithms\u002Fdivide-and-conquer\u002Fselection":4595,"\u002Falgorithms\u002Fdivide-and-conquer\u002Ffast-multiplication":4599,"\u002Falgorithms\u002Fsorting\u002Fheaps-and-heapsort":4603,"\u002Falgorithms\u002Fsorting\u002Fsorting-lower-bounds":4608,"\u002Falgorithms\u002Fsorting\u002Flinear-time-sorting":4612,"\u002Falgorithms\u002Fsorting\u002Fexternal-sorting":4616,"\u002Falgorithms\u002Fdata-structures\u002Felementary-structures":4620,"\u002Falgorithms\u002Fdata-structures\u002Fhash-tables":4625,"\u002Falgorithms\u002Fdata-structures\u002Fbinary-search-trees":4629,"\u002Falgorithms\u002Fdata-structures\u002Favl-trees":4633,"\u002Falgorithms\u002Fdata-structures\u002Fbalanced-trees":4637,"\u002Falgorithms\u002Fdata-structures\u002Funion-find":4641,"\u002Falgorithms\u002Fdata-structures\u002Ffenwick-and-segment-trees":4645,"\u002Falgorithms\u002Fdata-structures\u002Fspatial-data-structures":4649,"\u002Falgorithms\u002Fdata-structures\u002Fskip-lists-and-probabilistic-structures":4653,"\u002Falgorithms\u002Fdata-structures\u002Fb-trees":4657,"\u002Falgorithms\u002Fdata-structures\u002Fdata-stream-algorithms":4661,"\u002Falgorithms\u002Fdata-structures\u002Fstreaming-sketches":4665,"\u002Falgorithms\u002Fsequences\u002Ftwo-pointers-and-windows":4669,"\u002Falgorithms\u002Fsequences\u002Fprefix-sums":4674,"\u002Falgorithms\u002Fsequences\u002Fmonotonic-stacks":4678,"\u002Falgorithms\u002Fsequences\u002Fbinary-search-on-the-answer":4682,"\u002Falgorithms\u002Fsequences\u002Fstring-matching":4686,"\u002Falgorithms\u002Fsequences\u002Fkmp-and-z-function":4690,"\u002Falgorithms\u002Fsequences\u002Ftries":4694,"\u002Falgorithms\u002Fsequences\u002Fsuffix-arrays-and-aho-corasick":4698,"\u002Falgorithms\u002Fgraphs\u002Frepresentations-and-traversal":4702,"\u002Falgorithms\u002Fgraphs\u002Fdepth-first-search":4707,"\u002Falgorithms\u002Fgraphs\u002Ftopological-sort-and-scc":4711,"\u002Falgorithms\u002Fgraphs\u002Fminimum-spanning-trees":4715,"\u002Falgorithms\u002Fgraphs\u002Fkruskal-and-prim":4719,"\u002Falgorithms\u002Fgraphs\u002Fshortest-paths":4723,"\u002Falgorithms\u002Fgraphs\u002Fall-pairs-and-negative-weights":4727,"\u002Falgorithms\u002Fgraphs\u002Fnetwork-flow":4731,"\u002Falgorithms\u002Fgraphs\u002Fmax-flow-min-cut":4735,"\u002Falgorithms\u002Fgraphs\u002Fbridges-and-articulation-points":4739,"\u002Falgorithms\u002Fgraphs\u002Flowest-common-ancestor":4743,"\u002Falgorithms\u002Fgraphs\u002Ftwo-sat":4747,"\u002Falgorithms\u002Fgraphs\u002Feulerian-tours":4751,"\u002Falgorithms\u002Fgraphs\u002Fbipartite-matching":4755,"\u002Falgorithms\u002Fgreedy\u002Fthe-greedy-method":4759,"\u002Falgorithms\u002Fgreedy\u002Fscheduling-and-intervals":4764,"\u002Falgorithms\u002Fgreedy\u002Fhuffman-codes":4768,"\u002Falgorithms\u002Fgreedy\u002Fmatroids":4772,"\u002Falgorithms\u002Fgreedy\u002Fstable-matching":4776,"\u002Falgorithms\u002Fdynamic-programming\u002Fprinciples":4780,"\u002Falgorithms\u002Fdynamic-programming\u002Fsequence-dp":4785,"\u002Falgorithms\u002Fdynamic-programming\u002Flongest-increasing-subsequence":4789,"\u002Falgorithms\u002Fdynamic-programming\u002Fknapsack":4793,"\u002Falgorithms\u002Fdynamic-programming\u002Fcoin-change-and-unbounded":4797,"\u002Falgorithms\u002Fdynamic-programming\u002Finterval-dp":4801,"\u002Falgorithms\u002Fdynamic-programming\u002Ftree-dp":4805,"\u002Falgorithms\u002Fdynamic-programming\u002Fbitmask-dp":4809,"\u002Falgorithms\u002Fdynamic-programming\u002Fdp-optimizations":4813,"\u002Falgorithms\u002Fdynamic-programming\u002Fdp-on-graphs":4817,"\u002Falgorithms\u002Fdynamic-programming\u002Fdigit-and-probability-dp":4821,"\u002Falgorithms\u002Fbacktracking\u002Fbacktracking-fundamentals":4825,"\u002Falgorithms\u002Fbacktracking\u002Fconstraint-search":4830,"\u002Falgorithms\u002Fbacktracking\u002Fbranch-and-bound":4834,"\u002Falgorithms\u002Fbacktracking\u002Fgraph-backtracking":4838,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fnumber-theory-basics":4842,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fmodular-exponentiation-and-primality":4847,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fsieve-and-factorization":4851,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fcombinatorics":4855,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fmatrix-exponentiation":4859,"\u002Falgorithms\u002Fmathematical-algorithms\u002Ffast-fourier-transform":4863,"\u002Falgorithms\u002Fmathematical-algorithms\u002Fgradient-descent":4867,"\u002Falgorithms\u002Fcomputational-geometry\u002Fgeometric-primitives":4871,"\u002Falgorithms\u002Fcomputational-geometry\u002Fconvex-hull":4876,"\u002Falgorithms\u002Fcomputational-geometry\u002Fsweep-line":4880,"\u002Falgorithms\u002Fcomputational-geometry\u002Fpolygons-and-proximity":4884,"\u002Falgorithms\u002Fintractability\u002Fp-np-reductions":4888,"\u002Falgorithms\u002Fintractability\u002Fnp-completeness":4893,"\u002Falgorithms\u002Fintractability\u002Fcoping-with-hardness":4897,"\u002Falgorithms\u002Fintractability\u002Fapproximation-algorithms":4901,"\u002Falgorithms":4905,"\u002Fcalculus\u002Flimits-and-continuity\u002Ffunctions-and-models":4908,"\u002Fcalculus\u002Flimits-and-continuity\u002Fthe-limit-of-a-function":4913,"\u002Fcalculus\u002Flimits-and-continuity\u002Flimit-laws-and-the-precise-definition":4917,"\u002Fcalculus\u002Flimits-and-continuity\u002Fcontinuity":4921,"\u002Fcalculus\u002Fderivatives\u002Fthe-derivative-and-rates-of-change":4925,"\u002Fcalculus\u002Fderivatives\u002Fdifferentiation-rules-and-the-chain-rule":4930,"\u002Fcalculus\u002Fderivatives\u002Fimplicit-differentiation-and-related-rates":4934,"\u002Fcalculus\u002Fderivatives\u002Flinear-approximations-and-differentials":4938,"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fextrema-and-the-mean-value-theorem":4942,"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fhow-derivatives-shape-a-graph":4947,"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fcurve-sketching-and-optimization":4951,"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fnewtons-method-and-antiderivatives":4955,"\u002Fcalculus\u002Fintegrals\u002Farea-and-the-definite-integral":4959,"\u002Fcalculus\u002Fintegrals\u002Fthe-fundamental-theorem-of-calculus":4964,"\u002Fcalculus\u002Fintegrals\u002Fthe-substitution-rule":4968,"\u002Fcalculus\u002Fapplications-of-integration\u002Fareas-and-volumes":4972,"\u002Fcalculus\u002Fapplications-of-integration\u002Fwork-average-value-and-arc-length":4977,"\u002Fcalculus\u002Fapplications-of-integration\u002Fphysics-economics-and-probability":4981,"\u002Fcalculus\u002Fexponential-logarithmic-and-inverse-functions\u002Finverse-functions-logarithms-and-exponentials":4985,"\u002Fcalculus\u002Fexponential-logarithmic-and-inverse-functions\u002Fgrowth-decay-inverse-trig-and-hyperbolic-functions":4990,"\u002Fcalculus\u002Fexponential-logarithmic-and-inverse-functions\u002Flhospitals-rule":4994,"\u002Fcalculus\u002Ftechniques-of-integration\u002Fintegration-by-parts":4998,"\u002Fcalculus\u002Ftechniques-of-integration\u002Ftrigonometric-integrals-and-substitution":5003,"\u002Fcalculus\u002Ftechniques-of-integration\u002Fpartial-fractions-and-integration-strategy":5007,"\u002Fcalculus\u002Ftechniques-of-integration\u002Fapproximate-and-improper-integrals":5011,"\u002Fcalculus\u002Fparametric-and-polar\u002Fparametric-curves-and-their-calculus":5015,"\u002Fcalculus\u002Fparametric-and-polar\u002Fpolar-coordinates":5020,"\u002Fcalculus\u002Fparametric-and-polar\u002Fconic-sections":5024,"\u002Fcalculus\u002Fsequences-and-series\u002Fsequences":5028,"\u002Fcalculus\u002Fsequences-and-series\u002Fseries-and-the-integral-test":5033,"\u002Fcalculus\u002Fsequences-and-series\u002Fthe-convergence-tests":5037,"\u002Fcalculus\u002Fsequences-and-series\u002Fpower-series":5041,"\u002Fcalculus\u002Fsequences-and-series\u002Ftaylor-and-maclaurin-series":5045,"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fvectors-and-the-dot-product":5049,"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fthe-cross-product-lines-and-planes":5054,"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fcylinders-and-quadric-surfaces":5058,"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fvector-functions-and-space-curves":5062,"\u002Fcalculus\u002Fvectors-and-space-curves\u002Farc-length-curvature-and-motion":5066,"\u002Fcalculus\u002Fpartial-derivatives\u002Ffunctions-of-several-variables":5070,"\u002Fcalculus\u002Fpartial-derivatives\u002Fpartial-derivatives":5075,"\u002Fcalculus\u002Fpartial-derivatives\u002Ftangent-planes-and-the-chain-rule":5078,"\u002Fcalculus\u002Fpartial-derivatives\u002Fdirectional-derivatives-and-the-gradient":5082,"\u002Fcalculus\u002Fpartial-derivatives\u002Foptimization-and-lagrange-multipliers":5086,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fdouble-integrals":5090,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Ftriple-integrals-and-coordinate-systems":5095,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fvector-fields-and-line-integrals":5099,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fgreens-theorem-curl-and-divergence":5103,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fsurface-integrals":5107,"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fstokes-and-the-divergence-theorem":5111,"\u002Fcalculus":5115,"\u002Fmechanics\u002Ffoundations\u002Fmeasurement-and-dimensions":5118,"\u002Fmechanics\u002Ffoundations\u002Fvector-algebra":5122,"\u002Fmechanics\u002Fkinematics\u002Fone-dimensional-motion":5126,"\u002Fmechanics\u002Fkinematics\u002Fmotion-graphs":5131,"\u002Fmechanics\u002Fkinematics\u002Fprojectile-motion":5135,"\u002Fmechanics\u002Fkinematics\u002Frelative-motion":5139,"\u002Fmechanics\u002Fkinematics\u002Fcircular-motion":5143,"\u002Fmechanics\u002Fdynamics\u002Fnewtons-laws":5147,"\u002Fmechanics\u002Fdynamics\u002Ffree-body-diagrams":5152,"\u002Fmechanics\u002Fdynamics\u002Ffriction-and-curved-motion":5156,"\u002Fmechanics\u002Fdynamics\u002Fnumerical-dynamics":5160,"\u002Fmechanics\u002Fdynamics\u002Fcenter-of-mass-systems":5164,"\u002Fmechanics\u002Fenergy\u002Fwork-and-kinetic-energy":5168,"\u002Fmechanics\u002Fenergy\u002Fpotential-energy":5173,"\u002Fmechanics\u002Fenergy\u002Fmultiparticle-work":5177,"\u002Fmechanics\u002Fenergy\u002Fmass-energy-and-binding":5181,"\u002Fmechanics\u002Fenergy\u002Fphotons-and-quantization":5185,"\u002Fmechanics\u002Fmomentum\u002Fmomentum-and-collisions":5189,"\u002Fmechanics\u002Fmomentum\u002Fcenter-of-mass-collisions":5194,"\u002Fmechanics\u002Fmomentum\u002Frocket-propulsion":5198,"\u002Fmechanics\u002Frotation\u002Frotational-inertia":5202,"\u002Fmechanics\u002Frotation\u002Frotational-dynamics":5207,"\u002Fmechanics\u002Frotation\u002Frolling-motion":5211,"\u002Fmechanics\u002Frotation\u002Fangular-momentum":5215,"\u002Fmechanics\u002Frotation\u002Frolling-resistance":5219,"\u002Fmechanics\u002Frotation\u002Fgyroscopic-precession":5223,"\u002Fmechanics\u002Fgravity-and-matter\u002Fkeplerian-orbits":5227,"\u002Fmechanics\u002Fgravity-and-matter\u002Fgravitational-fields":5232,"\u002Fmechanics\u002Fgravity-and-matter\u002Fstatic-equilibrium":5236,"\u002Fmechanics\u002Fgravity-and-matter\u002Ffluid-statics":5240,"\u002Fmechanics\u002Fgravity-and-matter\u002Ffluid-flow":5244,"\u002Fmechanics\u002Fgravity-and-matter\u002Forbital-motion":5248,"\u002Fmechanics\u002Fgravity-and-matter\u002Fstress-and-elasticity":5252,"\u002Fmechanics\u002Foscillations-waves\u002Fdamped-oscillators":5256,"\u002Fmechanics\u002Foscillations-waves\u002Ftravelling-waves":5261,"\u002Fmechanics\u002Foscillations-waves\u002Fwave-superposition":5265,"\u002Fmechanics\u002Foscillations-waves\u002Fstanding-waves":5269,"\u002Fmechanics\u002Foscillations-waves\u002Fsound-waves":5273,"\u002Fmechanics\u002Foscillations-waves\u002Fdoppler-effect":5277,"\u002Fmechanics\u002Foscillations-waves\u002Fwave-packets":5281,"\u002Fmechanics\u002Foscillations-waves\u002Fbeats-and-coupling":5285,"\u002Fmechanics\u002Foscillations-waves\u002Fsimple-harmonic-motion":5289,"\u002Fmechanics\u002Foscillations-waves\u002Fpendulum-motion":5293,"\u002Fmechanics\u002Foscillations-waves\u002Fdriven-oscillators":5297,"\u002Fmechanics\u002Foscillations-waves\u002Fwave-boundaries":5301,"\u002Fmechanics\u002Fthermodynamics\u002Fkinetic-theory-of-ideal-gases":5305,"\u002Fmechanics\u002Fthermodynamics\u002Ffirst-law-of-thermodynamics":5310,"\u002Fmechanics\u002Fthermodynamics\u002Fentropy-and-the-second-law":5314,"\u002Fmechanics\u002Fthermodynamics\u002Fthermal-processes":5318,"\u002Fmechanics\u002Fthermodynamics\u002Fphase-changes":5322,"\u002Fmechanics\u002Fthermodynamics\u002Fthermal-machines":5326,"\u002Fmechanics":5330,"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Fcharge-and-conductors":5333,"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Fcoulombs-law":5338,"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Felectric-field-and-force":5342,"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Felectric-field-maps":5346,"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Felectric-dipoles":5350,"\u002Felectricity-and-magnetism\u002Fcontinuous-charge-distributions\u002Fcontinuous-charge-fields":5354,"\u002Felectricity-and-magnetism\u002Fcontinuous-charge-distributions\u002Fgauss-law-and-conductors":5359,"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Fpoint-charge-potential":5363,"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Fpotential-gradients-and-equipotentials":5368,"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Felectrostatic-energy-and-pressure":5372,"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Flaplace-boundary-problems":5376,"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Fcontinuous-charge-potentials":5380,"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fcapacitance-fundamentals":5384,"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fcapacitor-networks":5389,"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fcapacitor-energy-and-force":5393,"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fdielectric-polarization-and-breakdown":5397,"\u002Felectricity-and-magnetism\u002Fdirect-current-circuits\u002Fcurrent-and-resistance":5401,"\u002Felectricity-and-magnetism\u002Fdirect-current-circuits\u002Fkirchhoff-network-analysis":5406,"\u002Felectricity-and-magnetism\u002Fdirect-current-circuits\u002Frc-transients":5410,"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmagnetic-trajectories":5414,"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fhall-effect":5419,"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmagnetic-force-on-conductors":5423,"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmagnetic-dipoles":5427,"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmass-spectrometry":5431,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fmoving-charge-fields":5435,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fbiot-savart-law":5440,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fcircular-current-loops":5444,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Famperes-law":5448,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fgauss-law-for-magnetism":5452,"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fmagnetic-materials":5456,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fmagnetic-flux":5460,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Ffaradays-law":5465,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Flenzs-law":5469,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fmotional-emf":5473,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Feddy-currents":5477,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fself-inductance":5481,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fmagnetic-energy":5485,"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Frl-circuits":5489,"\u002Felectricity-and-magnetism\u002Falternating-current\u002Fac-fundamentals":5493,"\u002Felectricity-and-magnetism\u002Falternating-current\u002Freactance":5498,"\u002Felectricity-and-magnetism\u002Falternating-current\u002Frlc-resonance":5502,"\u002Felectricity-and-magnetism\u002Falternating-current\u002Fac-power":5506,"\u002Felectricity-and-magnetism\u002Falternating-current\u002Ftransformers":5510,"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Fdisplacement-current":5514,"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Felectromagnetic-waves":5519,"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Felectromagnetic-momentum":5523,"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Fdipole-radiation":5527,"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Fpolarization":5531,"\u002Felectricity-and-magnetism\u002Foptics\u002Freflection-and-refraction":5535,"\u002Felectricity-and-magnetism\u002Foptics\u002Fthin-lenses":5540,"\u002Felectricity-and-magnetism\u002Foptics\u002Fspherical-mirrors":5544,"\u002Felectricity-and-magnetism":5548,"\u002Flinear-algebra\u002Flinear-systems\u002Fsystems-and-echelon-forms":5551,"\u002Flinear-algebra\u002Flinear-systems\u002Fvector-and-matrix-equations":5556,"\u002Flinear-algebra\u002Flinear-systems\u002Fsolution-sets-and-applications":5560,"\u002Flinear-algebra\u002Flinear-systems\u002Flinear-independence":5564,"\u002Flinear-algebra\u002Flinear-systems\u002Flinear-transformations":5568,"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fmatrix-operations":5572,"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fmatrix-inverse-and-invertibility":5577,"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fpartitioned-matrices-and-lu":5581,"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fsubspaces-dimension-rank":5585,"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fapplications-leontief-and-graphics":5589,"\u002Flinear-algebra\u002Fdeterminants\u002Fdeterminants-and-cofactors":5593,"\u002Flinear-algebra\u002Fdeterminants\u002Fproperties-of-determinants":5598,"\u002Flinear-algebra\u002Fdeterminants\u002Fcramer-volume-and-area":5602,"\u002Flinear-algebra\u002Fvector-spaces\u002Fvector-spaces-and-subspaces":5606,"\u002Flinear-algebra\u002Fvector-spaces\u002Fnull-and-column-spaces":5611,"\u002Flinear-algebra\u002Fvector-spaces\u002Fbases-and-independent-sets":5615,"\u002Flinear-algebra\u002Fvector-spaces\u002Fcoordinate-systems":5619,"\u002Flinear-algebra\u002Fvector-spaces\u002Fdimension-and-rank":5623,"\u002Flinear-algebra\u002Fvector-spaces\u002Fchange-of-basis":5627,"\u002Flinear-algebra\u002Fvector-spaces\u002Fdifference-equations-and-markov":5631,"\u002Flinear-algebra\u002Feigenvalues\u002Feigenvectors-and-eigenvalues":5635,"\u002Flinear-algebra\u002Feigenvalues\u002Fthe-characteristic-equation":5640,"\u002Flinear-algebra\u002Feigenvalues\u002Fdiagonalization":5644,"\u002Flinear-algebra\u002Feigenvalues\u002Feigenvectors-and-linear-transformations":5648,"\u002Flinear-algebra\u002Feigenvalues\u002Fcomplex-eigenvalues":5652,"\u002Flinear-algebra\u002Feigenvalues\u002Fdynamical-systems":5656,"\u002Flinear-algebra\u002Feigenvalues\u002Fpower-method":5660,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Finner-product-length-orthogonality":5664,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Forthogonal-sets-and-projections":5669,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Fgram-schmidt-and-qr":5673,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Fleast-squares-problems":5677,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Fleast-squares-applications":5681,"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Finner-product-spaces":5685,"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fdiagonalizing-symmetric-matrices":5689,"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fquadratic-forms":5694,"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fconstrained-optimization":5698,"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fsingular-value-decomposition":5702,"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fsvd-applications-pca-imaging":5706,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fnumerical-thinking-and-matrix-computation":5710,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Flu-and-cholesky":5715,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fconditioning-and-floating-point":5719,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fstability-and-error-analysis":5723,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fqr-and-numerical-least-squares":5727,"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fnumerical-eigenvalues-and-svd":5731,"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Faffine-combinations":5735,"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Faffine-independence-and-barycentric-coordinates":5740,"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Fconvex-combinations-and-convex-sets":5744,"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Fhyperplanes-and-polytopes":5748,"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Fcurves-and-surfaces":5752,"\u002Flinear-algebra":5756,"\u002Ftheory-of-computation":5759,"\u002Fcomputer-architecture\u002Ffoundations\u002Fbits-bytes-and-words":5762,"\u002Fcomputer-architecture\u002Ffoundations\u002Finteger-representation":5766,"\u002Fcomputer-architecture\u002Ffoundations\u002Finteger-arithmetic":5770,"\u002Fcomputer-architecture\u002Ffoundations\u002Ffloating-point":5774,"\u002Fcomputer-architecture\u002Ffoundations\u002Fboolean-algebra-and-bit-manipulation":5778,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fthe-machines-view":5782,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fdata-movement":5787,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Farithmetic-and-logic":5791,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fcontrol-flow":5795,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fprocedures":5799,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Farrays-structs-and-alignment":5803,"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fmemory-layout-and-buffer-overflows":5807,"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Fwhat-an-isa-is":5811,"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Finstruction-formats-and-operands":5816,"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Faddressing-modes":5820,"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Fthe-y86-64-instruction-set":5824,"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Fy86-64-programming":5828,"\u002Fcomputer-architecture\u002Fdigital-logic\u002Ftransistors-gates-and-boolean-functions":5832,"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fcombinational-logic-and-hcl":5837,"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fmultiplexers-decoders-and-the-alu":5841,"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fmemory-elements-latches-flip-flops-and-clocking":5845,"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fregister-files-and-random-access-memory":5849,"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fthe-fetch-decode-execute-cycle":5853,"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fthe-seq-stages":5858,"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fcontrol-logic-and-sequencing":5862,"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fassembling-seq":5866,"\u002Fcomputer-architecture\u002Fprocessor-design\u002Ftracing-a-program":5870,"\u002Fcomputer-architecture\u002Fpipelining\u002Fpipelining-principles":5874,"\u002Fcomputer-architecture\u002Fpipelining\u002Ffrom-seq-to-pipe":5879,"\u002Fcomputer-architecture\u002Fpipelining\u002Fdata-hazards-stalling-and-forwarding":5883,"\u002Fcomputer-architecture\u002Fpipelining\u002Fcontrol-hazards-and-branch-prediction":5887,"\u002Fcomputer-architecture\u002Fpipelining\u002Fthe-complete-pipe-processor":5891,"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fstorage-technologies-and-the-latency-gap":5895,"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Flocality":5900,"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fcache-memories-direct-mapped":5904,"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fset-associative-and-write-policies":5908,"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fcache-performance-and-cache-friendly-code":5912,"\u002Fcomputer-architecture\u002Fvirtual-memory\u002Faddress-spaces-and-translation":5916,"\u002Fcomputer-architecture\u002Fvirtual-memory\u002Fpage-tables-and-page-faults":5921,"\u002Fcomputer-architecture\u002Fvirtual-memory\u002Fthe-tlb-and-multi-level-page-tables":5925,"\u002Fcomputer-architecture\u002Fexceptions-and-io\u002Fexceptional-control-flow":5929,"\u002Fcomputer-architecture\u002Fexceptions-and-io\u002Finterrupts-and-the-kernel":5934,"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fprocesses-threads-and-parallelism":5938,"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fhardware-multithreading":5943,"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fcache-coherence":5947,"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fmemory-consistency-and-synchronization":5951,"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fmulticore-organization":5955,"\u002Fcomputer-architecture\u002Fcapstone\u002Fthe-whole-machine":5959,"\u002Fcomputer-architecture\u002Fcapstone\u002Fassembling-a-complete-cpu":5964,"\u002Fcomputer-architecture":5968,"\u002Fdifferential-equations\u002Ffoundations\u002Fmodels-and-direction-fields":5971,"\u002Fdifferential-equations\u002Ffoundations\u002Fclassification-and-terminology":5975,"\u002Fdifferential-equations\u002Ffirst-order\u002Flinear-first-order-integrating-factors":5979,"\u002Fdifferential-equations\u002Ffirst-order\u002Fseparable-and-exact":5984,"\u002Fdifferential-equations\u002Ffirst-order\u002Fmodeling-first-order":5988,"\u002Fdifferential-equations\u002Ffirst-order\u002Fautonomous-and-population-dynamics":5992,"\u002Fdifferential-equations\u002Ffirst-order\u002Fexistence-uniqueness-euler":5996,"\u002Fdifferential-equations\u002Ffirst-order\u002Ffirst-order-difference-equations":6000,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fhomogeneous-constant-coefficients":6004,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fcomplex-and-repeated-roots":6009,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fnonhomogeneous-undetermined-coefficients":6013,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fvariation-of-parameters":6017,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fmechanical-electrical-vibrations":6021,"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fhigher-order-linear":6025,"\u002Fdifferential-equations\u002Fseries-solutions\u002Fpower-series-ordinary-points":6029,"\u002Fdifferential-equations\u002Fseries-solutions\u002Fregular-singular-frobenius":6034,"\u002Fdifferential-equations\u002Fseries-solutions\u002Fbessel-and-special-functions":6038,"\u002Fdifferential-equations\u002Flaplace\u002Flaplace-definition-ivps":6042,"\u002Fdifferential-equations\u002Flaplace\u002Fstep-impulse-convolution":6047,"\u002Fdifferential-equations\u002Fsystems\u002Fmatrices-eigenvalues-review":6051,"\u002Fdifferential-equations\u002Fsystems\u002Fconstant-coefficient-systems-phase-portraits":6056,"\u002Fdifferential-equations\u002Fsystems\u002Frepeated-eigenvalues-fundamental-matrices":6060,"\u002Fdifferential-equations\u002Fnumerical\u002Feuler-and-runge-kutta":6064,"\u002Fdifferential-equations\u002Fnumerical\u002Fmultistep-systems-stability":6069,"\u002Fdifferential-equations\u002Fnonlinear\u002Fphase-plane-autonomous-stability":6073,"\u002Fdifferential-equations\u002Fnonlinear\u002Flocally-linear-and-liapunov":6078,"\u002Fdifferential-equations\u002Fnonlinear\u002Fcompeting-species-predator-prey-limit-cycles":6082,"\u002Fdifferential-equations\u002Fpdes-fourier-bvp\u002Ffourier-series":6086,"\u002Fdifferential-equations\u002Fpdes-fourier-bvp\u002Fheat-wave-laplace-equations":6091,"\u002Fdifferential-equations\u002Fpdes-fourier-bvp\u002Fsturm-liouville":6095,"\u002Fdifferential-equations\u002Fhistory-variations\u002Fcalculus-of-variations":6099,"\u002Fdifferential-equations\u002Fhistory-variations\u002Fhistorical-notes":6104,"\u002Fdifferential-equations":6108,"\u002Frelativity\u002Ffoundations\u002Fspecial-relativity-postulates":6111,"\u002Frelativity\u002Ffoundations\u002Florentz-transformation-spacetime":6116,"\u002Frelativity\u002Ffoundations\u002Ftime-dilation-length-contraction":6120,"\u002Frelativity\u002Ffoundations\u002Frelativistic-momentum-energy":6124,"\u002Frelativity\u002Ffoundations\u002Fgeneral-relativity":6128,"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Fminkowski-spacetime-and-the-interval":6132,"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Ffour-vectors-and-index-notation":6137,"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Fthe-lorentz-group-and-rapidity":6141,"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Fdoppler-aberration-and-appearance":6145,"\u002Frelativity\u002Frelativistic-dynamics\u002Ffour-momentum-force-and-accelerated-motion":6149,"\u002Frelativity\u002Frelativistic-dynamics\u002Fparticle-decays-and-two-body-kinematics":6154,"\u002Frelativity\u002Frelativistic-dynamics\u002Fcollisions-thresholds-and-the-cm-frame":6158,"\u002Frelativity\u002Frelativistic-dynamics\u002Fmandelstam-variables-and-invariants":6162,"\u002Frelativity\u002Fcovariant-electrodynamics\u002Ffour-current-and-the-four-potential":6166,"\u002Frelativity\u002Fcovariant-electrodynamics\u002Fthe-electromagnetic-field-tensor":6171,"\u002Frelativity\u002Fcovariant-electrodynamics\u002Ftransformation-of-electric-and-magnetic-fields":6175,"\u002Frelativity\u002Fcovariant-electrodynamics\u002Fcovariant-maxwell-and-the-stress-energy-tensor":6179,"\u002Frelativity\u002Fcurved-spacetime\u002Fthe-equivalence-principle-formalized":6183,"\u002Frelativity\u002Fcurved-spacetime\u002Fmanifolds-vectors-and-the-metric":6188,"\u002Frelativity\u002Fcurved-spacetime\u002Fcovariant-derivative-and-christoffel-symbols":6192,"\u002Frelativity\u002Fcurved-spacetime\u002Fgeodesics-and-the-geodesic-equation":6196,"\u002Frelativity\u002Fcurved-spacetime\u002Fcurvature-riemann-and-geodesic-deviation":6200,"\u002Frelativity\u002Fcurved-spacetime\u002Fthe-einstein-field-equations":6204,"\u002Frelativity\u002Fthe-schwarzschild-solution\u002Fthe-schwarzschild-metric":6208,"\u002Frelativity\u002Fthe-schwarzschild-solution\u002Fgeodesics-and-orbits-in-schwarzschild":6213,"\u002Frelativity\u002Fthe-schwarzschild-solution\u002Flight-bending-and-null-geodesics":6217,"\u002Frelativity\u002Ftests-of-general-relativity\u002Fperihelion-precession-of-mercury":6221,"\u002Frelativity\u002Ftests-of-general-relativity\u002Fdeflection-of-light-and-gravitational-lensing":6226,"\u002Frelativity\u002Ftests-of-general-relativity\u002Fgravitational-redshift-and-shapiro-delay":6230,"\u002Frelativity\u002Ftests-of-general-relativity\u002Frelativity-in-technology-gps":6234,"\u002Frelativity\u002Fblack-holes\u002Fhorizons-and-coordinate-singularities":6238,"\u002Frelativity\u002Fblack-holes\u002Frotating-and-charged-black-holes":6243,"\u002Frelativity\u002Fblack-holes\u002Fblack-hole-thermodynamics":6247,"\u002Frelativity\u002Fgravitational-waves\u002Flinearized-gravity-and-wave-solutions":6251,"\u002Frelativity\u002Fgravitational-waves\u002Fgeneration-and-the-quadrupole-formula":6256,"\u002Frelativity\u002Fgravitational-waves\u002Fdetection-ligo-and-the-first-events":6260,"\u002Frelativity\u002Fcosmological-bridge\u002Fthe-cosmological-principle-and-flrw-metric":6264,"\u002Frelativity\u002Fcosmological-bridge\u002Ffriedmann-equations-and-cosmic-dynamics":6269,"\u002Frelativity":6273,"\u002Fphysical-computing":6276,"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fblackbody-radiation-and-the-planck-quantum":6279,"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fthe-photoelectric-effect-and-the-photon":6284,"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fx-rays-and-the-compton-effect":6288,"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fthe-old-quantum-theory-bohr-and-sommerfeld":6292,"\u002Fquantum-mechanics\u002Fmatter-waves\u002Fde-broglie-waves-and-electron-diffraction":6296,"\u002Fquantum-mechanics\u002Fmatter-waves\u002Fwave-packets-and-the-probability-interpretation":6301,"\u002Fquantum-mechanics\u002Fmatter-waves\u002Fthe-uncertainty-principle":6305,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fthe-schrodinger-equation-in-one-dimension":6309,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fthe-free-particle-and-wave-packet-dynamics":6314,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fparticle-in-infinite-and-finite-square-wells":6318,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Foperators-expectation-values-and-the-harmonic-oscillator":6322,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fthe-dirac-delta-potential":6326,"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fbarrier-penetration-and-quantum-tunneling":6330,"\u002Fquantum-mechanics\u002Fformalism\u002Fhilbert-space-and-dirac-notation":6334,"\u002Fquantum-mechanics\u002Fformalism\u002Fobservables-hermitian-operators-and-eigenvalues":6339,"\u002Fquantum-mechanics\u002Fformalism\u002Fthe-postulates-and-quantum-measurement":6343,"\u002Fquantum-mechanics\u002Fformalism\u002Fposition-momentum-and-continuous-spectra":6347,"\u002Fquantum-mechanics\u002Fformalism\u002Fcommutators-and-the-generalized-uncertainty-principle":6351,"\u002Fquantum-mechanics\u002Fformalism\u002Ftime-evolution-schrodinger-and-heisenberg-pictures":6355,"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fladder-operators-and-the-number-states":6359,"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fcoherent-and-squeezed-states":6364,"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fsymmetries-generators-and-conservation-laws":6368,"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fparity-time-reversal-and-discrete-symmetries":6372,"\u002Fquantum-mechanics\u002Fangular-momentum\u002Forbital-angular-momentum-and-spherical-harmonics":6376,"\u002Fquantum-mechanics\u002Fangular-momentum\u002Fthe-angular-momentum-algebra":6380,"\u002Fquantum-mechanics\u002Fangular-momentum\u002Faddition-of-angular-momenta-and-clebsch-gordan":6384,"\u002Fquantum-mechanics\u002Fcentral-potentials\u002Fthe-schrodinger-equation-in-three-dimensions":6388,"\u002Fquantum-mechanics\u002Fcentral-potentials\u002Fthe-hydrogen-atom":6393,"\u002Fquantum-mechanics\u002Fcentral-potentials\u002Fthe-isotropic-oscillator-and-hidden-symmetry":6397,"\u002Fquantum-mechanics\u002Fspin\u002Fspin-half-pauli-matrices-and-stern-gerlach":6401,"\u002Fquantum-mechanics\u002Fspin\u002Fspin-in-a-magnetic-field-precession-and-resonance":6406,"\u002Fquantum-mechanics\u002Fspin\u002Ftwo-level-systems-and-the-bloch-sphere":6410,"\u002Fquantum-mechanics\u002Fidentical-particles\u002Fidentical-particles-and-exchange-symmetry":6414,"\u002Fquantum-mechanics\u002Fidentical-particles\u002Fthe-pauli-principle-atoms-and-the-periodic-table":6419,"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Ftime-independent-perturbation-theory":6423,"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Ffine-structure-and-the-real-hydrogen-atom":6428,"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Fthe-zeeman-and-stark-effects":6432,"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Fthe-variational-method":6436,"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Fthe-wkb-approximation":6440,"\u002Fquantum-mechanics":6444,"\u002Freal-analysis\u002Ffoundations\u002Fsets-logic-functions":6447,"\u002Freal-analysis\u002Ffoundations\u002Fordered-fields-completeness":6452,"\u002Freal-analysis\u002Ffoundations\u002Fabsolute-value-bounds":6456,"\u002Freal-analysis\u002Ffoundations\u002Fintervals-uncountability":6460,"\u002Freal-analysis\u002Fsequences-series\u002Fsequences-limits":6464,"\u002Freal-analysis\u002Fsequences-series\u002Flimit-laws-monotone":6469,"\u002Freal-analysis\u002Fsequences-series\u002Flimsup-bolzano-weierstrass":6473,"\u002Freal-analysis\u002Fsequences-series\u002Fcauchy-completeness":6477,"\u002Freal-analysis\u002Fsequences-series\u002Fseries-convergence":6481,"\u002Freal-analysis\u002Fsequences-series\u002Fabsolute-conditional-rearrangement":6485,"\u002Freal-analysis\u002Fmetric-spaces\u002Fmetric-spaces-norms":6489,"\u002Freal-analysis\u002Fmetric-spaces\u002Fopen-closed-sets":6494,"\u002Freal-analysis\u002Fmetric-spaces\u002Fconvergence-completeness":6498,"\u002Freal-analysis\u002Fmetric-spaces\u002Fcompactness":6502,"\u002Freal-analysis\u002Fmetric-spaces\u002Fconnectedness":6506,"\u002Freal-analysis\u002Fcontinuity\u002Flimits-of-functions":6510,"\u002Freal-analysis\u002Fcontinuity\u002Fcontinuous-functions":6514,"\u002Freal-analysis\u002Fcontinuity\u002Fevt-ivt":6518,"\u002Freal-analysis\u002Fcontinuity\u002Funiform-continuity":6522,"\u002Freal-analysis\u002Fcontinuity\u002Fcontinuity-metric-spaces":6526,"\u002Freal-analysis\u002Fcontinuity\u002Flimits-infinity-monotone":6530,"\u002Freal-analysis\u002Fdifferentiation\u002Fthe-derivative":6534,"\u002Freal-analysis\u002Fdifferentiation\u002Fmean-value-theorem":6539,"\u002Freal-analysis\u002Fdifferentiation\u002Ftaylors-theorem":6543,"\u002Freal-analysis\u002Fdifferentiation\u002Finverse-function-1d":6547,"\u002Freal-analysis\u002Friemann-integration\u002Fdarboux-integral":6551,"\u002Freal-analysis\u002Friemann-integration\u002Fintegrability-classes":6556,"\u002Freal-analysis\u002Friemann-integration\u002Fproperties-of-the-integral":6560,"\u002Freal-analysis\u002Friemann-integration\u002Ffundamental-theorem":6564,"\u002Freal-analysis\u002Friemann-integration\u002Flog-exp-improper":6567,"\u002Freal-analysis\u002Ffunction-sequences\u002Fpointwise-uniform-convergence":6571,"\u002Freal-analysis\u002Ffunction-sequences\u002Finterchange-of-limits":6576,"\u002Freal-analysis\u002Ffunction-sequences\u002Fpower-series-weierstrass":6580,"\u002Freal-analysis\u002Ffunction-sequences\u002Fpicard-ode":6584,"\u002Freal-analysis\u002Fseveral-variables\u002Fdifferentiability-rn":6588,"\u002Freal-analysis\u002Fseveral-variables\u002Fgradient-chain-rule":6593,"\u002Freal-analysis\u002Fseveral-variables\u002Fhigher-derivatives-taylor-extrema":6597,"\u002Freal-analysis\u002Fseveral-variables\u002Finverse-implicit-theorems":6601,"\u002Freal-analysis\u002Fseveral-variables\u002Fmultiple-integrals":6605,"\u002Freal-analysis":6609,"\u002Fabstract-algebra\u002Ffoundations\u002Fsets-functions-relations":6612,"\u002Fabstract-algebra\u002Ffoundations\u002Fintegers-and-modular-arithmetic":6616,"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fgroup-axioms-and-first-examples":6620,"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fdihedral-and-symmetric-groups":6625,"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fmatrix-and-quaternion-groups":6629,"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fhomomorphisms-and-group-actions":6633,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fsubgroups-and-substructures":6637,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fcyclic-groups":6642,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fgeneration-and-subgroup-lattices":6646,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fcosets-lagrange-and-normal-subgroups":6650,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fisomorphism-theorems":6654,"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fcomposition-series-and-the-alternating-group":6658,"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Factions-and-cayleys-theorem":6662,"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Fconjugation-and-the-class-equation":6667,"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Fsylow-theorems":6671,"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Fautomorphisms-and-simple-groups":6675,"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fdirect-products-and-finite-abelian-groups":6679,"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fsemidirect-products":6684,"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fnilpotent-and-solvable-groups":6688,"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fclassifying-small-groups":6692,"\u002Fabstract-algebra\u002Fring-theory\u002Frings-definitions-and-examples":6696,"\u002Fabstract-algebra\u002Fring-theory\u002Fideals-quotients-and-homomorphisms":6701,"\u002Fabstract-algebra\u002Fring-theory\u002Ffractions-and-the-chinese-remainder-theorem":6705,"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Feuclidean-domains-pids-ufds":6709,"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Fpolynomial-rings-over-fields":6714,"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Fgauss-lemma-and-unique-factorization":6718,"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Firreducibility-criteria-and-groebner":6722,"\u002Fabstract-algebra\u002Fmodule-theory\u002Fintroduction-to-modules":6726,"\u002Fabstract-algebra\u002Fmodule-theory\u002Ffree-modules-and-direct-sums":6731,"\u002Fabstract-algebra\u002Fmodule-theory\u002Ftensor-products-and-exact-sequences":6735,"\u002Fabstract-algebra\u002Fmodule-theory\u002Fvector-spaces-and-linear-maps":6739,"\u002Fabstract-algebra\u002Fmodules-over-pids\u002Fstructure-theorem-over-pids":6743,"\u002Fabstract-algebra\u002Fmodules-over-pids\u002Frational-canonical-form":6748,"\u002Fabstract-algebra\u002Fmodules-over-pids\u002Fjordan-canonical-form":6752,"\u002Fabstract-algebra\u002Ffield-theory\u002Ffield-extensions-and-algebraic-elements":6756,"\u002Fabstract-algebra\u002Ffield-theory\u002Fstraightedge-and-compass-constructions":6761,"\u002Fabstract-algebra\u002Ffield-theory\u002Fsplitting-fields-and-algebraic-closure":6765,"\u002Fabstract-algebra\u002Ffield-theory\u002Fseparable-and-cyclotomic-extensions":6769,"\u002Fabstract-algebra\u002Fgalois-theory\u002Fthe-galois-correspondence":6773,"\u002Fabstract-algebra\u002Fgalois-theory\u002Ffinite-fields":6778,"\u002Fabstract-algebra\u002Fgalois-theory\u002Fcyclotomic-and-abelian-extensions":6782,"\u002Fabstract-algebra\u002Fgalois-theory\u002Fgalois-groups-of-polynomials":6786,"\u002Fabstract-algebra\u002Fgalois-theory\u002Fsolvability-by-radicals-and-the-quintic":6790,"\u002Fabstract-algebra\u002Fcapstone\u002Fcommutative-algebra-and-algebraic-geometry":6794,"\u002Fabstract-algebra\u002Fcapstone\u002Frepresentation-and-character-theory":6799,"\u002Fabstract-algebra":6803,"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fatomic-spectra-rutherford":6806,"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fbohr-model-hydrogen":6811,"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fx-ray-spectra-franck-hertz":6815,"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fbohr-sommerfeld-old-quantum-theory":6819,"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fold-quantum-theory-limits-wkb":6823,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fschrodinger-3d-hydrogen":6827,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fhydrogen-wave-functions":6832,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fradial-equation-in-full":6836,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fsymmetry-degeneracy-runge-lenz":6840,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fexpectation-values-virial":6844,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fquantum-defects-alkali-spectra":6848,"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Frydberg-atoms":6852,"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Frelativistic-kinetic-correction":6856,"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Fspin-orbit-thomas-precession":6861,"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Fdarwin-term-fine-structure-formula":6865,"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Fdirac-equation-hydrogen":6869,"\u002Fatomic-physics\u002Fqed-corrections-and-hyperfine-structure\u002Flamb-shift-qed":6873,"\u002Fatomic-physics\u002Fqed-corrections-and-hyperfine-structure\u002Fhyperfine-structure-21cm":6878,"\u002Fatomic-physics\u002Fqed-corrections-and-hyperfine-structure\u002Fnuclear-effects-isotope-shift":6882,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fperiodic-table-atomic-spectra":6886,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fcentral-field-self-consistent":6891,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fidentical-particles-hartree-fock":6895,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fhelium-two-electron-atom":6899,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fls-jj-coupling-term-symbols":6903,"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fhund-rules-ground-terms":6907,"\u002Fatomic-physics\u002Fatoms-in-external-fields\u002Fzeeman-effect":6911,"\u002Fatomic-physics\u002Fatoms-in-external-fields\u002Fpaschen-back-intermediate":6916,"\u002Fatomic-physics\u002Fatoms-in-external-fields\u002Fstark-effect-polarizability":6920,"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Ftime-dependent-perturbation-golden-rule":6924,"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Fdipole-approximation-einstein-coefficients":6929,"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Fselection-rules-forbidden-transitions":6933,"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Flifetimes-and-line-shapes":6937,"\u002Fatomic-physics\u002Flasers-and-spectroscopy\u002Flaser-principles":6941,"\u002Fatomic-physics\u002Flasers-and-spectroscopy\u002Fspectroscopy-techniques":6946,"\u002Fatomic-physics\u002Flasers-and-spectroscopy\u002Fline-catalog-nist-asd":6950,"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Flaser-cooling-doppler":6954,"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Fsub-doppler-trapping":6959,"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Fbose-einstein-condensation":6963,"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Foptical-clocks-precision":6967,"\u002Fatomic-physics":6971,"\u002Fdatabases":6974,"\u002Fcategory-theory\u002Ffoundations\u002Fwhat-is-a-category":6977,"\u002Fcategory-theory\u002Ffoundations\u002Fexamples-of-categories":6981,"\u002Fcategory-theory\u002Ffoundations\u002Fspecial-morphisms":6985,"\u002Fcategory-theory\u002Ffoundations\u002Ffunctors":6989,"\u002Fcategory-theory\u002Ffoundations\u002Fnatural-transformations":6993,"\u002Fcategory-theory\u002Ffoundations\u002Fsize-and-set-theory":6997,"\u002Fcategory-theory\u002Funiversal-properties\u002Funiversal-properties":7001,"\u002Fcategory-theory\u002Funiversal-properties\u002Fproducts-and-coproducts":7006,"\u002Fcategory-theory\u002Funiversal-properties\u002Fconstructions-on-categories":7010,"\u002Fcategory-theory\u002Frepresentables-yoneda\u002Frepresentable-functors":7014,"\u002Fcategory-theory\u002Frepresentables-yoneda\u002Fyoneda-lemma":7019,"\u002Fcategory-theory\u002Frepresentables-yoneda\u002Fyoneda-consequences":7023,"\u002Fcategory-theory\u002Flimits-colimits\u002Flimits":7027,"\u002Fcategory-theory\u002Flimits-colimits\u002Fproducts-equalizers-pullbacks":7032,"\u002Fcategory-theory\u002Flimits-colimits\u002Fcolimits":7036,"\u002Fcategory-theory\u002Flimits-colimits\u002Fcomputing-limits":7040,"\u002Fcategory-theory\u002Flimits-colimits\u002Flimits-and-functors":7044,"\u002Fcategory-theory\u002Fadjunctions\u002Fadjunctions":7048,"\u002Fcategory-theory\u002Fadjunctions\u002Funits-and-counits":7053,"\u002Fcategory-theory\u002Fadjunctions\u002Fadjunctions-via-universal-arrows":7057,"\u002Fcategory-theory\u002Fadjunctions\u002Ffree-forgetful-adjunctions":7061,"\u002Fcategory-theory\u002Fadjoints-limits\u002Flimits-via-adjoints":7065,"\u002Fcategory-theory\u002Fadjoints-limits\u002Fpresheaf-limits-colimits":7070,"\u002Fcategory-theory\u002Fadjoints-limits\u002Fadjoints-preserve-limits":7074,"\u002Fcategory-theory\u002Fadjoints-limits\u002Fadjoint-functor-theorem":7078,"\u002Fcategory-theory\u002Fmonads-algebras\u002Fmonads":7082,"\u002Fcategory-theory\u002Fmonads-algebras\u002Falgebras-eilenberg-moore":7087,"\u002Fcategory-theory\u002Fmonads-algebras\u002Fkleisli-and-programming":7091,"\u002Fcategory-theory\u002Fmonads-algebras\u002Falgebras-for-endofunctors":7095,"\u002Fcategory-theory\u002Fcartesian-closed-lambda\u002Fcartesian-closed-categories":7099,"\u002Fcategory-theory\u002Fcartesian-closed-lambda\u002Flambda-calculus-correspondence":7104,"\u002Fcategory-theory\u002Fcartesian-closed-lambda\u002Ffixed-points-and-recursion":7108,"\u002Fcategory-theory":7112,"\u002Fdeep-learning\u002Fmathematical-background\u002Flinear-algebra-for-deep-learning":7115,"\u002Fdeep-learning\u002Fmathematical-background\u002Fprobability-and-information-theory":7119,"\u002Fdeep-learning\u002Fmathematical-background\u002Fnumerical-computation":7123,"\u002Fdeep-learning\u002Fmathematical-background\u002Fcalculus":7127,"\u002Fdeep-learning\u002Ffoundations\u002Fwhat-is-deep-learning":7130,"\u002Fdeep-learning\u002Ffoundations\u002Fmachine-learning-refresher":7134,"\u002Fdeep-learning\u002Ffoundations\u002Flinear-models-and-the-perceptron":7138,"\u002Fdeep-learning\u002Fneural-networks\u002Fthe-multilayer-perceptron":7142,"\u002Fdeep-learning\u002Fneural-networks\u002Factivation-functions":7147,"\u002Fdeep-learning\u002Fneural-networks\u002Funiversal-approximation":7151,"\u002Fdeep-learning\u002Fneural-networks\u002Fbackpropagation":7155,"\u002Fdeep-learning\u002Fneural-networks\u002Floss-functions-and-output-units":7159,"\u002Fdeep-learning\u002Foptimization\u002Fgradient-descent-and-sgd":7163,"\u002Fdeep-learning\u002Foptimization\u002Fmomentum-and-adaptive-methods":7168,"\u002Fdeep-learning\u002Foptimization\u002Finitialization":7172,"\u002Fdeep-learning\u002Foptimization\u002Fthe-optimization-landscape":7176,"\u002Fdeep-learning\u002Foptimization\u002Fsecond-order-and-approximate-methods":7180,"\u002Fdeep-learning\u002Fregularization\u002Fregularization-overview":7184,"\u002Fdeep-learning\u002Fregularization\u002Fdropout-and-data-augmentation":7189,"\u002Fdeep-learning\u002Fregularization\u002Fearly-stopping-and-parameter-sharing":7193,"\u002Fdeep-learning\u002Fregularization\u002Fnormalization":7197,"\u002Fdeep-learning\u002Farchitectures\u002Fconvolutional-networks":7201,"\u002Fdeep-learning\u002Farchitectures\u002Fcnn-architectures":7206,"\u002Fdeep-learning\u002Farchitectures\u002Frecurrent-networks":7210,"\u002Fdeep-learning\u002Farchitectures\u002Flstm-and-gru":7214,"\u002Fdeep-learning\u002Farchitectures\u002Fattention-and-transformers":7218,"\u002Fdeep-learning\u002Farchitectures\u002Fthe-transformer-architecture":7222,"\u002Fdeep-learning\u002Farchitectures\u002Ftransformers-in-practice":7226,"\u002Fdeep-learning\u002Farchitectures\u002Fgraph-neural-networks":7230,"\u002Fdeep-learning\u002Farchitectures\u002Fstate-space-models":7234,"\u002Fdeep-learning\u002Ftheory\u002Fgeneralization-theory":7238,"\u002Fdeep-learning\u002Ftheory\u002Fadversarial-robustness":7243,"\u002Fdeep-learning\u002Ftheory\u002Fadversarial-defenses":7247,"\u002Fdeep-learning\u002Ftheory\u002Fbayesian-and-ensemble-methods":7251,"\u002Fdeep-learning\u002Ftheory\u002Fdeep-equilibrium-models":7255,"\u002Fdeep-learning\u002Fgenerative-models\u002Flinear-factor-models":7259,"\u002Fdeep-learning\u002Fgenerative-models\u002Fautoencoders":7264,"\u002Fdeep-learning\u002Fgenerative-models\u002Fvariational-autoencoders":7268,"\u002Fdeep-learning\u002Fgenerative-models\u002Fgenerative-adversarial-networks":7272,"\u002Fdeep-learning\u002Fgenerative-models\u002Fautoregressive-and-normalizing-flows":7276,"\u002Fdeep-learning\u002Fgenerative-models\u002Fenergy-based-and-boltzmann-machines":7280,"\u002Fdeep-learning\u002Fgenerative-models\u002Fdiffusion-and-score-based-models":7284,"\u002Fdeep-learning\u002Fprobabilistic-methods\u002Fstructured-probabilistic-models":7288,"\u002Fdeep-learning\u002Fprobabilistic-methods\u002Fmonte-carlo-and-mcmc":7293,"\u002Fdeep-learning\u002Fprobabilistic-methods\u002Fapproximate-inference":7297,"\u002Fdeep-learning\u002Fpractical\u002Fpractical-methodology":7301,"\u002Fdeep-learning\u002Fpractical\u002Fhyperparameters-and-debugging":7306,"\u002Fdeep-learning\u002Fpractical\u002Frepresentation-learning":7310,"\u002Fdeep-learning\u002Fpractical\u002Ftransfer-learning":7314,"\u002Fdeep-learning\u002Fpractical\u002Fapplications":7318,"\u002Fdeep-learning\u002Fpractical\u002Fmodel-compression-and-distillation":7322,"\u002Fdeep-learning\u002Fpractical\u002Fmeta-learning-and-few-shot":7326,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Flarge-language-models":7330,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fscaling-inference-and-alignment":7335,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fseq2seq-pretraining-and-bart":7339,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Ftext-to-text-transfer-and-conditional-generation":7343,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fspeech-and-audio-models":7347,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fself-supervised-speech-and-synthesis":7351,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fai-agents":7355,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fagent-memory-retrieval-and-orchestration":7359,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fmixture-of-experts":7363,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fmultimodal-models":7367,"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Ffusion-and-vision-language-models":7371,"\u002Fdeep-learning\u002Freinforcement-learning\u002Ffoundations-of-reinforcement-learning":7375,"\u002Fdeep-learning\u002Freinforcement-learning\u002Fmodel-free-prediction-and-control":7380,"\u002Fdeep-learning\u002Freinforcement-learning\u002Fdeep-q-networks":7384,"\u002Fdeep-learning\u002Freinforcement-learning\u002Fpolicy-gradients-and-actor-critic":7388,"\u002Fdeep-learning\u002Freinforcement-learning\u002Frl-from-human-feedback":7392,"\u002Fdeep-learning":7396,"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fequilibrium-state-variables-zeroth-law":7399,"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Ffirst-law-heat-and-work":7403,"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fsecond-law-entropy-and-the-carnot-bound":7407,"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fthermodynamic-potentials-and-maxwell-relations":7411,"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fstability-response-functions-and-the-third-law":7415,"\u002Fstatistical-mechanics\u002Ffoundations\u002Fclassical-statistics-and-equipartition":7419,"\u002Fstatistical-mechanics\u002Ffoundations\u002Fphase-space-and-liouvilles-theorem":7424,"\u002Fstatistical-mechanics\u002Ffoundations\u002Fensembles-and-the-equal-probability-postulate":7428,"\u002Fstatistical-mechanics\u002Ffoundations\u002Fstatistical-entropy-boltzmann-and-gibbs":7432,"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Fmicrocanonical-ensemble-and-entropy":7436,"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Fequilibrium-conditions-temperature-pressure-chemical-potential":7441,"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Fideal-gas-phase-space-and-the-sackur-tetrode-entropy":7445,"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Ftwo-state-systems-paramagnets-and-negative-temperature":7449,"\u002Fstatistical-mechanics\u002Fcanonical\u002Fcanonical-ensemble-and-the-boltzmann-distribution":7453,"\u002Fstatistical-mechanics\u002Fcanonical\u002Fpartition-function-and-the-helmholtz-free-energy":7458,"\u002Fstatistical-mechanics\u002Fcanonical\u002Fenergy-fluctuations-and-ensemble-equivalence":7462,"\u002Fstatistical-mechanics\u002Fcanonical\u002Fthe-einstein-solid-and-harmonic-systems":7466,"\u002Fstatistical-mechanics\u002Fcanonical\u002Fparamagnetism-and-the-schottky-anomaly":7470,"\u002Fstatistical-mechanics\u002Fclassical-gas\u002Fideal-gas-partition-function-and-the-gibbs-paradox":7474,"\u002Fstatistical-mechanics\u002Fclassical-gas\u002Fequipartition-and-the-virial-theorem":7479,"\u002Fstatistical-mechanics\u002Fclassical-gas\u002Fmolecular-gases-rotation-and-vibration":7483,"\u002Fstatistical-mechanics\u002Fgrand-canonical\u002Fgrand-canonical-ensemble-and-the-grand-partition-function":7487,"\u002Fstatistical-mechanics\u002Fgrand-canonical\u002Fchemical-potential-fugacity-and-number-fluctuations":7492,"\u002Fstatistical-mechanics\u002Fgrand-canonical\u002Fensemble-summary-and-the-thermodynamic-web":7496,"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fquantum-statistics-bose-einstein-and-fermi-dirac":7500,"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fderiving-the-quantum-distributions":7505,"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fthe-classical-limit-and-quantum-concentration":7509,"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fideal-quantum-gases-general-framework":7513,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fbose-einstein-condensation-and-the-fermion-gas":7517,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fthe-photon-gas-and-plancks-radiation-law":7522,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fblackbody-thermodynamics-and-radiation-pressure":7526,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fphonons-and-the-debye-model":7530,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fbose-einstein-condensation-derived":7534,"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fthermodynamics-of-the-bose-gas-and-superfluidity":7538,"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fthe-ideal-fermi-gas-at-zero-temperature":7542,"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fsommerfeld-expansion-and-electrons-in-metals":7547,"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fwhite-dwarfs-and-the-chandrasekhar-limit":7551,"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fneutron-stars-and-nuclear-matter":7555,"\u002Fstatistical-mechanics\u002Finteractions\u002Fthe-cluster-expansion-and-virial-coefficients":7559,"\u002Fstatistical-mechanics\u002Finteractions\u002Fthe-van-der-waals-gas-and-liquid-gas-coexistence":7564,"\u002Fstatistical-mechanics\u002Finteractions\u002Fquantum-gases-with-interactions-and-exchange":7568,"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fphases-coexistence-and-classification":7572,"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fthe-ising-model-and-exact-solutions":7577,"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fmean-field-theory-and-the-weiss-model":7581,"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fcritical-exponents-and-landau-theory":7585,"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fthe-renormalization-group-idea":7589,"\u002Fstatistical-mechanics\u002Ffluctuations\u002Fthermodynamic-fluctuations-and-response":7593,"\u002Fstatistical-mechanics\u002Ffluctuations\u002Fbrownian-motion-and-the-langevin-equation":7598,"\u002Fstatistical-mechanics\u002Ffluctuations\u002Flinear-response-and-the-fluctuation-dissipation-theorem":7602,"\u002Fstatistical-mechanics":7606,"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fbonding-mechanisms":7609,"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fmolecular-orbitals-and-h2-plus":7614,"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fhydrogen-molecule-and-exchange":7618,"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fvan-der-waals-forces":7622,"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Frotational-vibrational-spectra":7626,"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Fanharmonicity-and-rovibrational-structure":7631,"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Framan-and-electronic-bands":7635,"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Flasers-and-masers":7639,"\u002Fcondensed-matter\u002Fcrystal-structure\u002Fstructure-of-solids":7643,"\u002Fcondensed-matter\u002Fcrystal-structure\u002Fbravais-lattices-and-crystal-systems":7648,"\u002Fcondensed-matter\u002Fcrystal-structure\u002Freciprocal-lattice-and-brillouin-zones":7652,"\u002Fcondensed-matter\u002Fcrystal-structure\u002Fdiffraction-and-structure-factors":7656,"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fphonon-dispersion":7660,"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fphonons-quantization-and-dos":7665,"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fdebye-einstein-heat-capacity":7669,"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fanharmonicity-and-thermal-transport":7673,"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Ffree-electron-gas-and-conduction":7677,"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Fsommerfeld-model-and-heat-capacity":7682,"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Ftransport-and-the-hall-effect":7686,"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Fscreening-and-plasmons":7690,"\u002Fcondensed-matter\u002Fband-theory\u002Fblochs-theorem-and-energy-bands":7694,"\u002Fcondensed-matter\u002Fband-theory\u002Fnearly-free-electron-model":7699,"\u002Fcondensed-matter\u002Fband-theory\u002Ftight-binding-method":7703,"\u002Fcondensed-matter\u002Fband-theory\u002Ffermi-surfaces-and-semiclassical-dynamics":7707,"\u002Fcondensed-matter\u002Fsemiconductors\u002Fsemiconductor-bands-and-junctions":7711,"\u002Fcondensed-matter\u002Fsemiconductors\u002Fintrinsic-and-extrinsic-semiconductors":7716,"\u002Fcondensed-matter\u002Fsemiconductors\u002Fcarrier-transport-and-recombination":7720,"\u002Fcondensed-matter\u002Fsemiconductors\u002Fthe-pn-junction":7724,"\u002Fcondensed-matter\u002Fsemiconductors\u002Ftransistors-and-optoelectronics":7728,"\u002Fcondensed-matter\u002Fdielectrics-and-ferroelectrics\u002Fdielectrics-and-polarization":7732,"\u002Fcondensed-matter\u002Fdielectrics-and-ferroelectrics\u002Fferroelectrics-and-piezoelectrics":7737,"\u002Fcondensed-matter\u002Fmagnetism\u002Fdiamagnetism-and-paramagnetism":7741,"\u002Fcondensed-matter\u002Fmagnetism\u002Fexchange-and-ferromagnetism":7746,"\u002Fcondensed-matter\u002Fmagnetism\u002Fantiferromagnetism-and-domains":7750,"\u002Fcondensed-matter\u002Fmagnetism\u002Fspin-waves-and-magnons":7754,"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fsuperconductivity-phenomenology":7758,"\u002Fcondensed-matter\u002Fsuperconductivity\u002Flondon-theory-and-the-meissner-effect":7763,"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fginzburg-landau-theory":7767,"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fbcs-theory":7771,"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fjosephson-and-high-tc":7775,"\u002Fcondensed-matter\u002Fnanostructures\u002Fquantum-wells-wires-and-dots":7779,"\u002Fcondensed-matter\u002Fnanostructures\u002Finteger-quantum-hall-effect":7784,"\u002Fcondensed-matter\u002Fnanostructures\u002Ffractional-quantum-hall-and-topology":7788,"\u002Fcondensed-matter\u002Fnanostructures\u002Fgraphene-and-dirac-materials":7792,"\u002Fcondensed-matter":7796,"\u002Flogic\u002Ffoundations\u002Flogic-as-a-mathematical-model":7799,"\u002Flogic\u002Fsentential-logic\u002Fformal-languages-and-well-formed-formulas":7803,"\u002Flogic\u002Fsentential-logic\u002Ftruth-assignments-and-tautologies":7808,"\u002Flogic\u002Fsentential-logic\u002Funique-readability-and-parsing":7812,"\u002Flogic\u002Fsentential-logic\u002Finduction-and-recursion":7816,"\u002Flogic\u002Fsentential-logic\u002Fexpressive-completeness-and-normal-forms":7820,"\u002Flogic\u002Fsentential-logic\u002Fboolean-circuits":7824,"\u002Flogic\u002Fsentential-logic\u002Fcompactness-and-effectiveness":7828,"\u002Flogic\u002Ffirst-order-languages\u002Ffirst-order-languages":7832,"\u002Flogic\u002Ffirst-order-languages\u002Fstructures-truth-and-satisfaction":7837,"\u002Flogic\u002Ffirst-order-languages\u002Fdefinability-and-elementary-equivalence":7841,"\u002Flogic\u002Ffirst-order-languages\u002Fterms-substitution-and-parsing":7845,"\u002Flogic\u002Fdeductive-calculus\u002Fa-deductive-calculus":7849,"\u002Flogic\u002Fdeductive-calculus\u002Fdeduction-theorem-and-derived-rules":7854,"\u002Flogic\u002Fdeductive-calculus\u002Fsoundness":7858,"\u002Flogic\u002Fdeductive-calculus\u002Fcompleteness-and-consistency":7862,"\u002Flogic\u002Fmodels-and-theories\u002Fcompactness-and-lowenheim-skolem":7866,"\u002Flogic\u002Fmodels-and-theories\u002Ftheories-elementary-classes-and-categoricity":7871,"\u002Flogic\u002Fmodels-and-theories\u002Finterpretations-between-theories":7875,"\u002Flogic\u002Fmodels-and-theories\u002Fnonstandard-analysis":7879,"\u002Flogic\u002Farithmetic-and-definability\u002Fdefinability-in-arithmetic":7883,"\u002Flogic\u002Farithmetic-and-definability\u002Fnatural-numbers-with-successor":7888,"\u002Flogic\u002Farithmetic-and-definability\u002Fpresburger-and-reducts":7892,"\u002Flogic\u002Farithmetic-and-definability\u002Fa-subtheory-and-representability":7896,"\u002Flogic\u002Fincompleteness\u002Farithmetization-of-syntax":7900,"\u002Flogic\u002Fincompleteness\u002Fincompleteness-and-undecidability":7905,"\u002Flogic\u002Fincompleteness\u002Fsecond-incompleteness-theorem":7909,"\u002Flogic\u002Fcomputability-and-representability\u002Frecursive-functions":7913,"\u002Flogic\u002Fcomputability-and-representability\u002Frepresenting-exponentiation":7918,"\u002Flogic\u002Fsecond-order-logic\u002Fsecond-order-languages":7922,"\u002Flogic\u002Fsecond-order-logic\u002Fskolem-functions-and-many-sorted-logic":7927,"\u002Flogic\u002Fsecond-order-logic\u002Fgeneral-structures":7931,"\u002Flogic":7935,"\u002Freinforcement-learning\u002Ffoundations\u002Fwhat-is-reinforcement-learning":7938,"\u002Freinforcement-learning\u002Ffoundations\u002Fa-brief-history-of-rl":7942,"\u002Freinforcement-learning\u002Ffoundations\u002Fmulti-armed-bandits":7946,"\u002Freinforcement-learning\u002Ffoundations\u002Fbandit-exploration-algorithms":7950,"\u002Freinforcement-learning\u002Ffoundations\u002Fmarkov-decision-processes":7954,"\u002Freinforcement-learning\u002Ffoundations\u002Fvalue-functions-and-optimality":7958,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fdynamic-programming":7962,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fdp-async-and-gpi":7966,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fmonte-carlo-methods":7970,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fmonte-carlo-off-policy":7974,"\u002Freinforcement-learning\u002Ftabular-methods\u002Ftemporal-difference-learning":7978,"\u002Freinforcement-learning\u002Ftabular-methods\u002Ftd-control-sarsa-and-q-learning":7982,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fn-step-bootstrapping":7986,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fn-step-off-policy-methods":7990,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fplanning-and-learning":7994,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fplanning-focusing-and-decision-time":7998,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fdecision-time-planning":8002,"\u002Freinforcement-learning\u002Ftabular-methods\u002Fmonte-carlo-tree-search":8006,"\u002Freinforcement-learning\u002Fapproximation\u002Fon-policy-prediction":8010,"\u002Freinforcement-learning\u002Fapproximation\u002Ffeature-construction-and-nonlinear":8015,"\u002Freinforcement-learning\u002Fapproximation\u002Fon-policy-control":8019,"\u002Freinforcement-learning\u002Fapproximation\u002Faverage-reward-control":8023,"\u002Freinforcement-learning\u002Fapproximation\u002Foff-policy-and-the-deadly-triad":8027,"\u002Freinforcement-learning\u002Fapproximation\u002Fbellman-error-and-gradient-td":8031,"\u002Freinforcement-learning\u002Fapproximation\u002Feligibility-traces":8035,"\u002Freinforcement-learning\u002Fapproximation\u002Ftrue-online-and-sarsa-lambda":8039,"\u002Freinforcement-learning\u002Fapproximation\u002Fpolicy-gradient-methods":8043,"\u002Freinforcement-learning\u002Fapproximation\u002Factor-critic-and-continuous-actions":8047,"\u002Freinforcement-learning\u002Fapproximation\u002Fleast-squares-and-memory-based-methods":8051,"\u002Freinforcement-learning\u002Fapproximation\u002Fmemory-and-kernel-methods":8055,"\u002Freinforcement-learning\u002Fapproximation\u002Foff-policy-eligibility-traces":8059,"\u002Freinforcement-learning\u002Fapproximation\u002Fstable-off-policy-traces":8063,"\u002Freinforcement-learning\u002Fdeep-rl\u002Fdeep-q-networks":8067,"\u002Freinforcement-learning\u002Fdeep-rl\u002Fdqn-improvements":8071,"\u002Freinforcement-learning\u002Fdeep-rl\u002Factor-critic-and-ppo":8075,"\u002Freinforcement-learning\u002Fdeep-rl\u002Fppo-and-continuous-control":8079,"\u002Freinforcement-learning\u002Fdeep-rl\u002Fcase-studies":8083,"\u002Freinforcement-learning\u002Fdeep-rl\u002Frl-beyond-games":8087,"\u002Freinforcement-learning\u002Fdeep-rl\u002Ffrontiers":8091,"\u002Freinforcement-learning\u002Fdeep-rl\u002Freward-design-and-open-problems":8095,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fdistributional-and-rainbow":8099,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fdistributional-and-rainbow-part-2":8104,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fcontinuous-control":8108,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fcontinuous-control-part-2":8112,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmodel-based-rl":8116,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmodel-based-rl-part-2":8120,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fexploration":8124,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fexploration-part-2":8128,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Foffline-rl":8132,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Foffline-rl-part-2":8136,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fimitation-and-inverse-rl":8140,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fimitation-and-inverse-rl-part-2":8144,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmulti-agent-rl":8148,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmulti-agent-rl-part-2":8152,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fhierarchical-rl":8156,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fhierarchical-rl-part-2":8160,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Frlhf-and-language-models":8164,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fpartial-observability-pomdps":8168,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fpartial-observability-pomdps-part-2":8172,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fsafe-and-constrained-rl":8176,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fsafe-and-constrained-rl-part-2":8180,"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmeta-rl-and-generalization":8184,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fpsychology-of-reinforcement":8188,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Finstrumental-conditioning-and-control":8193,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fdopamine-and-td-error":8197,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fdopamine-in-the-brain":8201,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fanimal-learning-and-cognition":8205,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fcognitive-maps-and-planning":8209,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fneuroscience-of-reinforcement":8213,"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fseveral-learning-systems":8217,"\u002Freinforcement-learning":8221,"\u002Fartificial-intelligence\u002Ffoundations\u002Fwhat-is-ai":8223,"\u002Fartificial-intelligence\u002Ffoundations\u002Ffoundations-of-ai":8227,"\u002Fartificial-intelligence\u002Ffoundations\u002Fintelligent-agents":8231,"\u002Fartificial-intelligence\u002Ffoundations\u002Fagent-architectures":8235,"\u002Fartificial-intelligence\u002Fsearch\u002Funinformed-search":8239,"\u002Fartificial-intelligence\u002Fsearch\u002Fsearch-strategies-compared":8244,"\u002Fartificial-intelligence\u002Fsearch\u002Finformed-search":8248,"\u002Fartificial-intelligence\u002Fsearch\u002Fheuristic-functions":8252,"\u002Fartificial-intelligence\u002Fsearch\u002Flocal-search":8256,"\u002Fartificial-intelligence\u002Fsearch\u002Fpopulation-and-continuous-search":8260,"\u002Fartificial-intelligence\u002Fsearch\u002Fadversarial-search":8264,"\u002Fartificial-intelligence\u002Fsearch\u002Fgames-of-chance-and-imperfect-information":8268,"\u002Fartificial-intelligence\u002Fsearch\u002Fconstraint-satisfaction":8272,"\u002Fartificial-intelligence\u002Fsearch\u002Fcsp-search-and-structure":8276,"\u002Fartificial-intelligence\u002Fsearch\u002Fsearch-under-uncertainty":8280,"\u002Fartificial-intelligence\u002Fsearch\u002Fbelief-state-and-online-search":8284,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fpropositional-logic":8288,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fpropositional-inference":8293,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Ffirst-order-logic":8297,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Ffirst-order-logic-in-use":8301,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Finference-and-resolution":8305,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Ffirst-order-resolution":8309,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fclassical-planning":8313,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fplanning-graphs-and-graphplan":8317,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fplanning-in-the-real-world":8321,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fplanning-under-uncertainty":8325,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fknowledge-representation":8329,"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Freasoning-systems-and-defaults":8333,"\u002Fartificial-intelligence\u002Funcertainty\u002Fprobability-and-bayes":8337,"\u002Fartificial-intelligence\u002Funcertainty\u002Fbayes-rule-and-naive-bayes":8342,"\u002Fartificial-intelligence\u002Funcertainty\u002Fbayesian-networks":8346,"\u002Fartificial-intelligence\u002Funcertainty\u002Finference-in-bayesian-networks":8350,"\u002Fartificial-intelligence\u002Funcertainty\u002Freasoning-over-time":8354,"\u002Fartificial-intelligence\u002Funcertainty\u002Ftracking-and-data-association":8358,"\u002Fartificial-intelligence\u002Funcertainty\u002Fmaking-decisions":8362,"\u002Fartificial-intelligence\u002Funcertainty\u002Fmarkov-decision-processes":8366,"\u002Fartificial-intelligence\u002Funcertainty\u002Fdecision-networks-and-game-theory":8369,"\u002Fartificial-intelligence\u002Funcertainty\u002Fgame-theory-and-mechanism-design":8373,"\u002Fartificial-intelligence\u002Flearning\u002Flearning-from-examples":8377,"\u002Fartificial-intelligence\u002Flearning\u002Ftheory-and-model-families":8382,"\u002Fartificial-intelligence\u002Flearning\u002Fprobabilistic-learning":8386,"\u002Fartificial-intelligence\u002Flearning\u002Fexpectation-maximization":8390,"\u002Fartificial-intelligence\u002Flearning\u002Freinforcement-learning":8394,"\u002Fartificial-intelligence\u002Flearning\u002Fgeneralization-and-policy-search":8397,"\u002Fartificial-intelligence\u002Flearning\u002Fknowledge-in-learning":8401,"\u002Fartificial-intelligence\u002Flearning\u002Fknowledge-based-learning-methods":8405,"\u002Fartificial-intelligence\u002Ffrontiers\u002Fvision-and-perception":8409,"\u002Fartificial-intelligence\u002Ffrontiers\u002Freconstructing-the-3d-world":8414,"\u002Fartificial-intelligence\u002Ffrontiers\u002Frobotics":8418,"\u002Fartificial-intelligence\u002Ffrontiers\u002Frobot-planning-and-control":8422,"\u002Fartificial-intelligence\u002Ffrontiers\u002Fnatural-language-in-ai":8426,"\u002Fartificial-intelligence\u002Ffrontiers\u002Fnlp-grammar-translation-and-speech":8430,"\u002Fartificial-intelligence\u002Ffrontiers\u002Fphilosophy-and-future":8434,"\u002Fartificial-intelligence\u002Ffrontiers\u002Fai-ethics-and-future":8438,"\u002Fartificial-intelligence":8442,"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-constituents-nuclide-chart":8445,"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-size-charge-distributions":8450,"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-masses-binding-energy":8454,"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fsemi-empirical-mass-formula":8458,"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-moments-multipoles":8462,"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fnuclear-force-shell-overview":8466,"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fthe-deuteron":8471,"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fnucleon-nucleon-scattering":8475,"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fmeson-theory-isospin":8479,"\u002Fnuclear-physics\u002Fnuclear-models\u002Ffermi-gas-model":8483,"\u002Fnuclear-physics\u002Fnuclear-models\u002Fliquid-drop-collective-coordinates":8488,"\u002Fnuclear-physics\u002Fnuclear-models\u002Fshell-model-single-particle":8492,"\u002Fnuclear-physics\u002Fnuclear-models\u002Fcollective-model-rotations-vibrations":8496,"\u002Fnuclear-physics\u002Fradioactive-decay\u002Fdecay-law-modes":8500,"\u002Fnuclear-physics\u002Fradioactive-decay\u002Fdecay-kinetics-equilibrium":8505,"\u002Fnuclear-physics\u002Falpha-decay\u002Falpha-decay-gamow-theory":8509,"\u002Fnuclear-physics\u002Falpha-decay\u002Falpha-fine-structure-hindrance":8514,"\u002Fnuclear-physics\u002Fbeta-decay\u002Fbeta-decay-energetics-neutrino":8518,"\u002Fnuclear-physics\u002Fbeta-decay\u002Ffermi-theory-beta-decay":8523,"\u002Fnuclear-physics\u002Fbeta-decay\u002Fweak-interaction-parity-violation":8527,"\u002Fnuclear-physics\u002Fbeta-decay\u002Fdouble-beta-decay-neutrino-mass":8531,"\u002Fnuclear-physics\u002Fgamma-decay\u002Fgamma-multipole-radiation":8535,"\u002Fnuclear-physics\u002Fgamma-decay\u002Finternal-conversion-isomers":8540,"\u002Fnuclear-physics\u002Fgamma-decay\u002Fangular-correlations-mossbauer":8544,"\u002Fnuclear-physics\u002Fnuclear-reactions\u002Freaction-kinematics-cross-sections":8548,"\u002Fnuclear-physics\u002Fnuclear-reactions\u002Fcompound-nucleus-resonances":8553,"\u002Fnuclear-physics\u002Fnuclear-reactions\u002Fdirect-reactions-optical-model":8557,"\u002Fnuclear-physics\u002Ffission\u002Ffission-barrier-dynamics":8561,"\u002Fnuclear-physics\u002Ffission\u002Fchain-reactions-reactor-physics":8566,"\u002Fnuclear-physics\u002Ffusion-nucleosynthesis\u002Ffusion-reactions-confinement":8570,"\u002Fnuclear-physics\u002Ffusion-nucleosynthesis\u002Fstellar-nucleosynthesis":8575,"\u002Fnuclear-physics\u002Ffusion-nucleosynthesis\u002Fbig-bang-nucleosynthesis":8579,"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fcharged-particle-stopping-power":8583,"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fphoton-neutron-interactions":8588,"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fradiation-detectors":8592,"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fdosimetry-radiation-biology":8596,"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fnuclear-applications-dating-medicine":8600,"\u002Fnuclear-physics":8604,"\u002Fnatural-language-processing\u002Ffoundations\u002Fwhat-is-nlp":8607,"\u002Fnatural-language-processing\u002Ffoundations\u002Fregex-and-text-normalization":8611,"\u002Fnatural-language-processing\u002Ffoundations\u002Fminimum-edit-distance":8612,"\u002Fnatural-language-processing\u002Ffoundations\u002Fn-gram-language-models":8616,"\u002Fnatural-language-processing\u002Ffoundations\u002Fsmoothing-and-backoff":8620,"\u002Fnatural-language-processing\u002Fclassification\u002Fnaive-bayes-and-sentiment":8624,"\u002Fnatural-language-processing\u002Fclassification\u002Fevaluating-classifiers":8629,"\u002Fnatural-language-processing\u002Fclassification\u002Flogistic-regression":8633,"\u002Fnatural-language-processing\u002Fclassification\u002Fsentiment-and-affect-lexicons":8637,"\u002Fnatural-language-processing\u002Fsemantics\u002Fvector-semantics-and-embeddings":8640,"\u002Fnatural-language-processing\u002Fsemantics\u002Fstatic-word-embeddings":8645,"\u002Fnatural-language-processing\u002Fsemantics\u002Fneural-language-models":8649,"\u002Fnatural-language-processing\u002Fsequences\u002Fsequence-labeling":8653,"\u002Fnatural-language-processing\u002Fsequences\u002Fcrfs-and-neural-taggers":8657,"\u002Fnatural-language-processing\u002Fsequences\u002Frnns-and-lstms":8661,"\u002Fnatural-language-processing\u002Ftransformers\u002Ftransformers-and-attention":8665,"\u002Fnatural-language-processing\u002Ftransformers\u002Fthe-transformer-architecture":8669,"\u002Fnatural-language-processing\u002Ftransformers\u002Flarge-language-models":8672,"\u002Fnatural-language-processing\u002Ftransformers\u002Fllm-pretraining-and-scaling":8675,"\u002Fnatural-language-processing\u002Ftransformers\u002Ffine-tuning-and-prompting":8679,"\u002Fnatural-language-processing\u002Ftransformers\u002Fprompting-and-alignment":8683,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fconstituency-parsing":8687,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcky-scoring-and-evaluation":8692,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fdependency-parsing":8696,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fgraph-based-and-neural-dependency-parsing":8700,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fword-senses-and-wsd":8704,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fwsd-in-practice-and-induction":8708,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fsemantic-roles-and-information-extraction":8712,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Frelations-events-and-templates":8716,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcoreference-and-discourse":8720,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcoherence-and-discourse-structure":8724,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Flogical-semantics":8728,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcompositional-semantics-and-description-logics":8732,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fsemantic-parsing":8736,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fneural-semantic-parsing":8740,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Finformation-extraction":8744,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Ftimes-events-and-templates":8748,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fdiscourse-coherence":8752,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fentity-based-and-global-coherence":8756,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fconstituency-grammars":8760,"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Ftreebanks-and-lexicalized-grammars":8764,"\u002Fnatural-language-processing\u002Fapplications\u002Fmachine-translation":8768,"\u002Fnatural-language-processing\u002Fapplications\u002Fmachine-translation-decoding-and-evaluation":8772,"\u002Fnatural-language-processing\u002Fapplications\u002Fquestion-answering":8776,"\u002Fnatural-language-processing\u002Fapplications\u002Fquestion-answering-knowledge-and-llms":8780,"\u002Fnatural-language-processing\u002Fapplications\u002Fdialogue-and-chatbots":8784,"\u002Fnatural-language-processing\u002Fapplications\u002Fdialogue-systems-and-assistants":8788,"\u002Fnatural-language-processing\u002Fapplications\u002Ftext-summarization":8792,"\u002Fnatural-language-processing\u002Fapplications\u002Fabstractive-summarization-and-evaluation":8796,"\u002Fnatural-language-processing\u002Fspeech\u002Fphonetics":8800,"\u002Fnatural-language-processing\u002Fspeech\u002Facoustic-phonetics":8805,"\u002Fnatural-language-processing\u002Fspeech\u002Fautomatic-speech-recognition":8809,"\u002Fnatural-language-processing\u002Fspeech\u002Fasr-evaluation-and-applications":8813,"\u002Fnatural-language-processing":8817,"\u002Fparticle-physics\u002Ffoundations\u002Fhistorical-overview-particle-zoo":8820,"\u002Fparticle-physics\u002Ffoundations\u002Fparticle-physics-basic-concepts":8824,"\u002Fparticle-physics\u002Ffoundations\u002Ffundamental-interactions-force-carriers":8828,"\u002Fparticle-physics\u002Funits-kinematics\u002Fnatural-units-and-scales":8832,"\u002Fparticle-physics\u002Funits-kinematics\u002Ffour-vectors-invariant-mass":8837,"\u002Fparticle-physics\u002Funits-kinematics\u002Fdecay-scattering-kinematics-mandelstam":8841,"\u002Fparticle-physics\u002Funits-kinematics\u002Fcross-sections-golden-rule":8845,"\u002Fparticle-physics\u002Fsymmetries\u002Fconservation-laws-symmetries":8849,"\u002Fparticle-physics\u002Fsymmetries\u002Fdiscrete-symmetries-cpt":8854,"\u002Fparticle-physics\u002Fsymmetries\u002Fparity-violation-weak":8858,"\u002Fparticle-physics\u002Fsymmetries\u002Fsu2-su3-flavor-symmetry":8862,"\u002Fparticle-physics\u002Fquark-model\u002Feightfold-way-su3":8866,"\u002Fparticle-physics\u002Fquark-model\u002Fmeson-spectroscopy":8871,"\u002Fparticle-physics\u002Fquark-model\u002Fbaryon-spectroscopy":8875,"\u002Fparticle-physics\u002Fquark-model\u002Fcolor-confinement-exotics":8879,"\u002Fparticle-physics\u002Frelativistic-wave-equations\u002Fklein-gordon-equation":8883,"\u002Fparticle-physics\u002Frelativistic-wave-equations\u002Fdirac-equation-spinors":8888,"\u002Fparticle-physics\u002Frelativistic-wave-equations\u002Fantiparticles-hole-theory":8892,"\u002Fparticle-physics\u002Fqed\u002Ffeynman-rules-qed":8896,"\u002Fparticle-physics\u002Fqed\u002Fqed-tree-processes":8901,"\u002Fparticle-physics\u002Fqed\u002Frenormalization-running-coupling":8905,"\u002Fparticle-physics\u002Fqed\u002Felectron-g-2":8909,"\u002Fparticle-physics\u002Fweak-interaction\u002Fva-structure-weak":8913,"\u002Fparticle-physics\u002Fweak-interaction\u002Fw-z-bosons-decays":8918,"\u002Fparticle-physics\u002Fweak-interaction\u002Fckm-matrix":8922,"\u002Fparticle-physics\u002Fweak-interaction\u002Fcp-violation-kaons-b-mesons":8926,"\u002Fparticle-physics\u002Fqcd\u002Fcolor-su3-gluons":8930,"\u002Fparticle-physics\u002Fqcd\u002Fasymptotic-freedom-confinement":8935,"\u002Fparticle-physics\u002Fqcd\u002Fdeep-inelastic-scattering-partons":8939,"\u002Fparticle-physics\u002Fqcd\u002Fjets-hadronization":8943,"\u002Fparticle-physics\u002Felectroweak-higgs\u002Felectroweak-su2-u1":8947,"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fspontaneous-symmetry-breaking":8952,"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fhiggs-mechanism":8956,"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fhiggs-boson-discovery":8960,"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fstandard-model":8964,"\u002Fparticle-physics\u002Fneutrinos\u002Fneutrino-oscillations":8968,"\u002Fparticle-physics\u002Fneutrinos\u002Fneutrino-mass-pmns":8973,"\u002Fparticle-physics\u002Fneutrinos\u002Fdirac-majorana-experiments":8977,"\u002Fparticle-physics\u002Fexperiment\u002Faccelerators-luminosity":8981,"\u002Fparticle-physics\u002Fexperiment\u002Fdetectors-subsystems":8986,"\u002Fparticle-physics\u002Fexperiment\u002Fhow-discoveries-are-made":8990,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fbeyond-standard-model":8994,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fgrand-unified-theories":8998,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fsupersymmetry":9002,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fhierarchy-problem-naturalness":9006,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fdark-matter-candidates":9010,"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fmatter-antimatter-open-questions":9014,"\u002Fparticle-physics":9018,"\u002Fastrophysics-cosmology\u002Forientation\u002Fthe-sun-and-stars":9021,"\u002Fastrophysics-cosmology\u002Forientation\u002Fstellar-death-final-states":9026,"\u002Fastrophysics-cosmology\u002Forientation\u002Fgalaxies-and-cosmology":9030,"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Fmagnitudes-fluxes-and-the-distance-modulus":9034,"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Fstellar-spectra-and-spectral-classification":9039,"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Ftelescopes-and-detectors-across-the-spectrum":9043,"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Fthe-cosmic-distance-ladder":9047,"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fblackbody-radiation-and-specific-intensity":9051,"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fradiative-transfer-and-the-transfer-equation":9056,"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fspectral-line-formation-and-broadening":9060,"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fopacity-and-the-rosseland-mean":9064,"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fhydrostatic-equilibrium-and-the-virial-theorem":9068,"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fthe-equations-of-stellar-structure":9073,"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fthe-equation-of-state-and-polytropes":9077,"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fthe-standard-solar-model":9081,"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fthermonuclear-reaction-rates-and-the-gamow-peak":9085,"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fhydrogen-burning-pp-chains-and-cno":9090,"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fhelium-burning-and-the-triple-alpha-process":9094,"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fadvanced-burning-and-neutron-capture-nucleosynthesis":9098,"\u002Fastrophysics-cosmology\u002Fism-and-star-formation\u002Fphases-of-the-interstellar-medium":9102,"\u002Fastrophysics-cosmology\u002Fism-and-star-formation\u002Fmolecular-clouds-and-gravitational-collapse":9107,"\u002Fastrophysics-cosmology\u002Fism-and-star-formation\u002Fprotostars-and-the-pre-main-sequence":9111,"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fthe-main-sequence-and-its-structure":9115,"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fpost-main-sequence-low-mass-evolution":9120,"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fthe-evolution-of-massive-stars":9124,"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fstellar-pulsation-and-the-instability-strip":9128,"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fwhite-dwarfs-and-the-chandrasekhar-limit":9132,"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fcore-collapse-supernovae":9136,"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fthermonuclear-supernovae-type-ia":9140,"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fneutron-stars-and-pulsars":9144,"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fblack-holes-schwarzschild-and-kerr":9148,"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Fbinary-systems-and-mass-transfer":9152,"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Faccreting-compact-objects":9157,"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Fgravitational-waves-from-inspiraling-binaries":9161,"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Fmultimessenger-astronomy-and-gamma-ray-bursts":9165,"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fthe-milky-way":9169,"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fgalaxy-morphology-and-classification":9174,"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fgalaxy-rotation-curves-and-dark-matter":9178,"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Factive-galactic-nuclei-and-supermassive-black-holes":9182,"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fgalaxy-clusters-and-large-scale-structure":9186,"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fthe-expanding-universe-and-hubbles-law":9190,"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fthe-frw-metric-and-cosmological-redshift":9195,"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fthe-friedmann-equations-and-cosmic-dynamics":9199,"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fcosmological-models-and-distances":9202,"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fdark-energy-and-the-accelerating-universe":9206,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fthe-thermal-history-of-the-universe":9210,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fbig-bang-nucleosynthesis":9215,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Frecombination-and-the-cosmic-microwave-background":9219,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fcmb-anisotropies-and-cosmological-parameters":9223,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fcosmic-inflation":9227,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fstructure-formation-and-the-growth-of-perturbations":9231,"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fdark-matter-dark-energy-and-open-questions":9235,"\u002Fastrophysics-cosmology":9239,"\u002Fcolophon":9242,"\u002F":9245},{"path":4563,"title":4564,"module":3628,"summary":4565},"\u002Falgorithms\u002Ffoundations\u002Fwhat-is-an-algorithm","What Is an Algorithm?","An algorithm is a finite, mechanical recipe that transforms inputs into outputs. We define what counts as an algorithm, how we write one down, and the three things we always ask of it: is it correct, is it fast, and can we prove it.\n",{"path":4567,"title":4568,"module":3628,"summary":4569},"\u002Falgorithms\u002Ffoundations\u002Fproof-techniques","Proof Techniques","An algorithm without a proof is a conjecture. This lesson collects the handful\nof arguments that certify the algorithms in this course — direct proof,\ncontrapositive, contradiction, ordinary and strong induction, construction, and\ndisproof by counterexample — each with a small worked\nexample and a picture. Loop invariants are a form of induction,\nrecursive correctness falls to strong induction, and the classic broken proofs\n(all horses are the same color) show where inductions go wrong.\n",{"path":4571,"title":4572,"module":3628,"summary":4573},"\u002Falgorithms\u002Ffoundations\u002Fasymptotic-analysis","Asymptotic Analysis","We measure an algorithm's running time as a function of its input size, then strip away machine-specific constants and lower-order terms to compare algorithms cleanly. This lesson defines the RAM model and the $O$, $\\Omega$, $\\Theta$, $o$, and $\\omega$ notations, proves the polynomial theorem, and shows how to rank growth rates with the limit test, L'Hôpital, base substitution, and the logarithm identities the arguments lean on.\n",{"path":4575,"title":4576,"module":3628,"summary":4577},"\u002Falgorithms\u002Ffoundations\u002Fgrowth-rates-and-loop-analysis","Growth Rates and Loop Analysis","With the asymptotic notations in hand, we rank the functions that actually arise in running times — from constant to factorial — proving the orderings between rungs, then read the running time of a loop nest straight off the page. Sequential blocks add, nested loops multiply, index scaling gives logarithms; a worked trace and a tour of cache-aware and galactic algorithms close the lesson.\n",{"path":4579,"title":4580,"module":3628,"summary":4581},"\u002Falgorithms\u002Ffoundations\u002Frecurrences","Recurrences and the Master Theorem","Recursive and divide-and-conquer algorithms describe their own running time with a recurrence: $T(n)$ in terms of $T$ on smaller inputs. We solve recurrences three ways — drawing the recursion tree, guessing-and-verifying by induction, and applying the Master Theorem — using merge sort as the running example, then handle unequal splits with Akra–Bazzi.\n",{"path":4583,"title":4584,"module":3628,"summary":4585},"\u002Falgorithms\u002Ffoundations\u002Famortized-analysis","Amortized Analysis","Some operations are occasionally expensive but cheap on average across any\nsequence. Amortized analysis bounds the average cost per operation over a\nworst-case sequence — not an expectation — so a rare costly step is paid for by\nthe many cheap ones around it. This lesson develops the aggregate, accounting,\nand potential methods on dynamic-array doubling, the binary counter, and a\nstack with multipop.\n",{"path":4587,"title":4588,"module":4589,"summary":4590},"\u002Falgorithms\u002Fdivide-and-conquer\u002Fmergesort","Divide and Conquer & Mergesort","Divide & Conquer","Divide and conquer breaks a problem into smaller copies of itself, solves\nthem recursively, and stitches the answers together. We meet the paradigm\nthrough mergesort — its merge step, its loop-invariant proof, and the\nrecursion tree that pins its cost at $\\Theta(n\\log n)$ — then count inversions\nwith the same machinery and distill the whole pattern into the master theorem.\n",{"path":4592,"title":4593,"module":4589,"summary":4594},"\u002Falgorithms\u002Fdivide-and-conquer\u002Fquicksort","Quicksort","Quicksort sorts in place by partitioning around a pivot and recursing on\neach side. We give Lomuto and Hoare partitioning with a correctness\ninvariant, see why a bad pivot costs $\\Theta(n^2)$ while a balanced one gives\n$\\Theta(n\\log n)$, and prove that randomizing the pivot makes the expected\ncost $\\Theta(n\\log n)$ on every input.\n",{"path":4596,"title":4597,"module":4589,"summary":4598},"\u002Falgorithms\u002Fdivide-and-conquer\u002Fselection","Linear-Time Selection","Finding the $k$-th smallest element looks like it should require sorting, but\nit does not. Quickselect adapts quicksort's partition to recurse on just one\nside, achieving expected $O(n)$. The median-of-medians algorithm guarantees a\ngood pivot with the groups-of-five trick, pushing the worst case down to a\nprovable $O(n)$.\n",{"path":4600,"title":4601,"module":4589,"summary":4602},"\u002Falgorithms\u002Fdivide-and-conquer\u002Ffast-multiplication","Fast Multiplication","Grade-school multiplication is $\\Theta(n^2)$, yet divide and conquer beats it.\nKaratsuba multiplies $n$-bit integers with three half-size products instead of\nfour, giving $\\Theta(n^{\\log_2 3})$, and Strassen multiplies matrices with\nseven block products instead of eight, giving $\\Theta(n^{\\log_2 7})$. Both\nspend cheap additions to save an expensive multiplication, and the master\ntheorem quantifies the savings.\n",{"path":4604,"title":4605,"module":4606,"summary":4607},"\u002Falgorithms\u002Fsorting\u002Fheaps-and-heapsort","Heaps and Heapsort","Sorting & Order Statistics","A binary heap is a tree we store flat in an array, with index arithmetic\nstanding in for pointers. We build the max-heap property bottom-up in $O(n)$\ntime, sort in place in $\\Theta(n\\log n)$ by repeatedly extracting the maximum,\nand reuse the same structure to implement a priority queue.\n",{"path":4609,"title":4610,"module":4606,"summary":4611},"\u002Falgorithms\u002Fsorting\u002Fsorting-lower-bounds","Lower Bounds for Comparison Sorting","Every sort we have seen runs in $\\Omega(n\\log n)$, and that is no accident.\nModeling a sort as a decision tree of comparisons, we show any such tree must\nhave $n!$ leaves, forcing height $\\ge \\log_2(n!) = \\Omega(n\\log n)$ — a bound\nno comparison sort beats in the worst case, on average, or with randomness.\n",{"path":4613,"title":4614,"module":4606,"summary":4615},"\u002Falgorithms\u002Fsorting\u002Flinear-time-sorting","Sorting in Linear Time","The $\\Omega(n\\log n)$ barrier only binds algorithms that compare. By instead\nusing keys as array indices we slip past it: counting sort runs in\n$\\Theta(n+k)$ and is stable, radix sort layers it digit by digit, and bucket\nsort averages $\\Theta(n)$ on uniform data. We see exactly when each applies.\n",{"path":4617,"title":4618,"module":4606,"summary":4619},"\u002Falgorithms\u002Fsorting\u002Fexternal-sorting","External Sorting","When the data dwarfs main memory, the cost that matters is no longer\ncomparisons but block transfers to and from disk. External merge sort sorts\nmemory-sized runs, then folds them together with a heap-driven $k$-way merge in\n$\\Theta(\\log_k(N\u002FM))$ passes. Larger fan-out cuts passes; replacement selection\nbuilds longer runs to cut them further.\n",{"path":4621,"title":4622,"module":4623,"summary":4624},"\u002Falgorithms\u002Fdata-structures\u002Felementary-structures","Elementary Data Structures","Data Structures","Every container is built one of two ways: **contiguous** in an array, or\n**linked** through pointers. We trade cache-friendly random access against\n$O(1)$ splicing, derive the **amortized $O(1)$** append of a doubling dynamic\narray, and assemble the two ordered access disciplines — the LIFO **stack** and\nthe FIFO **queue** (with its generalization, the **deque**) — on top of both.\n",{"path":4626,"title":4627,"module":4623,"summary":4628},"\u002Falgorithms\u002Fdata-structures\u002Fhash-tables","Hash Tables","A hash table implements the dictionary — insert, search, delete — in expected\n$O(1)$ time by scattering keys across an array with a hash function. We build\nup from direct addressing, handle collisions by chaining and by open\naddressing, analyze the load factor $\\alpha$, and see how universal hashing\nachieves its expected-time guarantee against every input.\n",{"path":4630,"title":4631,"module":4623,"summary":4632},"\u002Falgorithms\u002Fdata-structures\u002Fbinary-search-trees","Binary Search Trees","A binary search tree keeps keys ordered so that every operation follows a\nsingle root-to-leaf path. We state the BST property, trace search, insert,\nsuccessor, and all three delete cases on concrete trees, prove the inorder\nwalk sorts, and note the drawback — every operation costs $O(h)$, and a\ncarelessly built tree degrades to height $h = \\Theta(n)$, motivating balance.\n",{"path":4634,"title":4635,"module":4623,"summary":4636},"\u002Falgorithms\u002Fdata-structures\u002Favl-trees","AVL Trees","An AVL tree is the first balanced BST: at every node the two subtrees' heights\ndiffer by at most $1$. A Fibonacci-style minimal-node argument forces height\n$h \\le 1.44\\log_2 n = O(\\log n)$, so search, insert, and delete are all\n$O(\\log n)$. Insertion rebalances with at most one of four rotation cases\n(LL, RR, LR, RL); deletion may rotate all the way to the root.\n",{"path":4638,"title":4639,"module":4623,"summary":4640},"\u002Falgorithms\u002Fdata-structures\u002Fbalanced-trees","Balanced Search Trees","An ordinary BST can degrade to height $\\Theta(n)$; balanced search trees\nguarantee $h = O(\\log n)$ by maintaining invariants and repairing them after\nevery update. We meet rotations, the local restructuring primitive, then\nred-black trees, whose color invariants force logarithmic height, and finally\nB-trees, which trade tall-and-thin for short-and-wide to win on disk.\n",{"path":4642,"title":4643,"module":4623,"summary":4644},"\u002Falgorithms\u002Fdata-structures\u002Funion-find","Disjoint Sets (Union-Find)","The disjoint-set data structure tracks a partition of elements into groups,\nanswering \"are these two in the same group?\" and merging groups on demand. A\nforest of parent pointers, sped up by union by rank and path compression,\ndrives every operation to near-constant $O(\\alpha(n))$ amortized time — the\nstructure behind connectivity queries and Kruskal's minimum spanning tree.\n",{"path":4646,"title":4647,"module":4623,"summary":4648},"\u002Falgorithms\u002Fdata-structures\u002Ffenwick-and-segment-trees","Fenwick & Segment Trees","A prefix-sum array answers a range sum in $O(1)$ but pays $O(n)$ per update;\na plain array updates in $O(1)$ but pays $O(n)$ per range sum. Fenwick and\nsegment trees give us _both_ in $O(\\log n)$. The Fenwick (binary indexed) tree\nis a tiny array keyed by the low bit; the segment tree is a general balanced\ntree over canonical ranges that handles any associative aggregate and, with\nlazy propagation, range updates too.\n",{"path":4650,"title":4651,"module":4623,"summary":4652},"\u002Falgorithms\u002Fdata-structures\u002Fspatial-data-structures","Spatial Data Structures","A balanced BST orders keys on a line, but points in the plane have no single\nnatural order. Quadtrees subdivide space recursively into quadrants; k-d trees\nsplit on alternating coordinates at the median. Both make range and\nnearest-neighbour queries fast by carving the plane into boxes a query can\nprune away. Range trees nest a y-tree in an x-tree for fast orthogonal range\nreporting; interval trees index intervals to answer stabbing queries.\n",{"path":4654,"title":4655,"module":4623,"summary":4656},"\u002Falgorithms\u002Fdata-structures\u002Fskip-lists-and-probabilistic-structures","Skip Lists & Probabilistic Structures","Balanced trees achieve $O(\\log n)$ with rotations and invariants; randomization\ngives the same bound far more simply. A skip list is a layered linked list whose\nexpress lanes are chosen by coin flips, giving expected $O(\\log n)$ search and\ninsert with no rebalancing. A Bloom filter trades exactness for space: a bit\narray and a few hashes answer set membership with no false negatives and a\ntunable false-positive rate, but cannot delete.\n",{"path":4658,"title":4659,"module":4623,"summary":4660},"\u002Falgorithms\u002Fdata-structures\u002Fb-trees","B-Trees","When data lives on disk, the cost that dominates is block transfers, not\ncomparisons — and a binary tree of a billion keys is thirty reads deep. A\nB-tree of minimum degree $t$ is short and wide: $t-1$ to $2t-1$ keys per node,\nall leaves at one depth, height $O(\\log_t n)$. Insertion splits a full node on\nthe way down and pushes its median up; deletion borrows or merges to keep nodes\nfull enough. High fan-out is what minimizes disk I\u002FO.\n",{"path":4662,"title":4663,"module":4623,"summary":4664},"\u002Falgorithms\u002Fdata-structures\u002Fdata-stream-algorithms","Data-Stream Algorithms","Most of this course assumes data sits in fast memory, addressable at will.\nExternal sorting relaxed that to a re-readable disk. The streaming model goes\nfurther: items arrive one at a time, are seen once, and must be discarded, with\nonly sublinear, often polylogarithmic, memory. In exchange, the answers are\napproximate and probabilistic. We set up the model, then meet reservoir\nsampling for a uniform sample of an unknown-length stream and Morris counting\nfor an approximate tally in doubly-logarithmic space.\n",{"path":4666,"title":4667,"module":4623,"summary":4668},"\u002Falgorithms\u002Fdata-structures\u002Fstreaming-sketches","Streaming Sketches","Sampling and counting kept a random subset or a single approximate tally.\nSketches go further: fixed, tiny summaries that answer questions about a\nstream's frequencies. We meet the Count–Min sketch for point frequency\nestimation, Misra–Gries for heavy hitters, and HyperLogLog for distinct\ncounts, each trading a controlled error for space that never grows with the\nstream.\n",{"path":4670,"title":4671,"module":4672,"summary":4673},"\u002Falgorithms\u002Fsequences\u002Ftwo-pointers-and-windows","Two Pointers & Sliding Windows","Sequences & Strings","A family of array idioms that collapse an obvious $O(n^2)$ scan into a single\n$O(n)$ pass by maintaining an invariant as indices move. We meet two pointers\n(converging on a sorted array, and a fast\u002Fslow pair for in-place rewriting)\nand the sliding window (fixed and variable size, amortized $O(n)$). The\ncompanion lesson on prefix sums picks up where the window's positivity\nassumption fails.\n",{"path":4675,"title":4676,"module":4672,"summary":4677},"\u002Falgorithms\u002Fsequences\u002Fprefix-sums","Prefix Sums & Difference Arrays","Prefix sums precompute the running total once so that any range-sum query is a\nsingle subtraction, $P[r{+}1]-P[l]$, in $O(1)$. A hash map of prefix\nfrequencies then counts subarrays summing to $k$ in $O(n)$ — even with negative\nentries, where the sliding window fails. The difference-array dual turns $m$\nrange-adds into $O(m+n)$, and the whole idea lifts to 2-D rectangle sums by\ninclusion–exclusion.\n",{"path":4679,"title":4680,"module":4672,"summary":4681},"\u002Falgorithms\u002Fsequences\u002Fmonotonic-stacks","Monotonic Stacks & Queues","A **monotonic stack** keeps its contents sorted by popping every element that\nwould break the order before each push — turning a family of \"previous\u002Fnext\ngreater (or smaller) element\" questions into a single $O(n)$ scan. We trace\nthe next-greater-element routine push by push and prove its amortized bound,\nfuse two such scans to measure the **largest rectangle in a histogram** in\nlinear time, extend the idea to a **monotonic deque** that streams the\n**sliding-window maximum** in $O(n)$, and use asymmetric tie-breaking to\ncount **subarray minimums** without double-counting duplicates.\n",{"path":4683,"title":4684,"module":4672,"summary":4685},"\u002Falgorithms\u002Fsequences\u002Fbinary-search-on-the-answer","Binary Search on the Answer","Binary search locates the boundary of a **monotone predicate** $p(x)$ in\n$O(\\log(\\text{range}))$ probes; sorted arrays are only one instance. We first\nestablish the half-open `while (lo \u003C hi)` template for $\\textsc{lower\\_bound}$\nand $\\textsc{upper\\_bound}$, then generalize to \"binary search on the answer\":\nwhenever feasibility is monotone in a numeric parameter, we binary search the\nparameter itself, calling a feasibility check at each step.\n",{"path":4687,"title":4688,"module":4672,"summary":4689},"\u002Falgorithms\u002Fsequences\u002Fstring-matching","String Matching: Naive & Rabin–Karp","Given a text $T$ of length $n$ and a pattern $P$ of length $m$, find every\noccurrence of $P$ in $T$. The naive scan costs $O(nm)$ and re-reads text it has\nalready seen. Rabin–Karp fixes the first inefficiency with a **rolling hash**:\neach length-$m$ window is summarized by one number, updated in $O(1)$ per slide,\nverified on a hash match to kill collisions, for expected $O(n+m)$. A companion\nlesson removes the re-reading entirely with KMP and the Z-function.\n",{"path":4691,"title":4692,"module":4672,"summary":4693},"\u002Falgorithms\u002Fsequences\u002Fkmp-and-z-function","String Matching: KMP & the Z-Function","Two linear-time matchers that beat Rabin–Karp's expected bound with a\nworst-case guarantee and no randomness. KMP precomputes a **failure function**\n$\\pi$ so a mismatch slides the pattern by $q-\\pi[q-1]$ and the text pointer\nnever backs up, for $O(n+m)$. The **Z-function** computes the longest\nprefix-match at every position via the Z-box, giving the same bound from a\ndifferent angle; the two encodings of a string's self-overlap convert freely.\n",{"path":4695,"title":4696,"module":4672,"summary":4697},"\u002Falgorithms\u002Fsequences\u002Ftries","Tries & Prefix Trees","A **trie** stores a set of strings in a tree keyed by _characters_, so that\ninsert, search, delete, and prefix-test all run in $O(L)$ time — the length\nof the key, _independent of how many keys are stored_. Shared prefixes are\nstored once, which makes tries the natural structure for autocomplete,\nwildcard dictionaries, board word-search, and — over the alphabet $\\{0,1\\}$\n— the maximum-XOR-pair problem. Radix (Patricia) trees compress the chains.\n",{"path":4699,"title":4700,"module":4672,"summary":4701},"\u002Falgorithms\u002Fsequences\u002Fsuffix-arrays-and-aho-corasick","Suffix Arrays, LCP & Aho–Corasick","A **suffix array** sorts all $n$ suffixes of a string, indexing every substring\nat once; built in $O(n\\log n)$, it locates a pattern by binary search in\n$O(m\\log n)$. Its companion **LCP array** (Kasai's $O(n)$ algorithm) counts\ndistinct substrings and finds the longest repeated substring. **Aho–Corasick**\ngeneralises KMP to a whole dictionary: a trie of patterns plus failure links\nscans the text once in $O(\\text{text} + \\text{matches})$ to report every\noccurrence of every pattern. Manacher's algorithm finds all palindromic\nsubstrings in $O(n)$.\n",{"path":4703,"title":4704,"module":4705,"summary":4706},"\u002Falgorithms\u002Fgraphs\u002Frepresentations-and-traversal","Graph Representations and Traversal","Graphs","A graph captures _relationships_ — who connects to whom. We fix the\nvocabulary, weigh the two standard representations (adjacency list versus\nmatrix), then meet the single search skeleton behind everything that follows:\nWhatever-First-Search, and its breadth-first reading, which finds shortest\npaths by number of edges in $O(V + E)$.\n",{"path":4708,"title":4709,"module":4705,"summary":4710},"\u002Falgorithms\u002Fgraphs\u002Fdepth-first-search","Depth-First Search","Swap BFS's queue for a stack and the search plunges instead of fanning out.\nDepth-first search stamps every vertex with discovery and finish times that\nnest like parentheses, classifies each edge as tree, back, forward, or cross,\nand — through the back edge — decides in one pass whether a graph has a cycle.\nThese timestamps underpin topological sort, strong\nconnectivity, and the rest of this module.\n",{"path":4712,"title":4713,"module":4705,"summary":4714},"\u002Falgorithms\u002Fgraphs\u002Ftopological-sort-and-scc","Topological Sort and Strong Connectivity","Directed acyclic graphs model dependencies: tasks that must precede other\ntasks. A _topological order_ lays such a graph out in a line so every edge\npoints forward, and depth-first finish times yield one almost for free.\nWe then ask the harder question for graphs _with_ cycles: which vertices can\nreach each other? The answer is the strongly connected components, found by a\ntwo-pass DFS.\n",{"path":4716,"title":4717,"module":4705,"summary":4718},"\u002Falgorithms\u002Fgraphs\u002Fminimum-spanning-trees","Minimum Spanning Trees","Given a weighted network, how do we connect everything as cheaply as possible?\nThe answer is a minimum spanning tree, and one lemma — the cut property —\njustifies _every_ correct MST algorithm. We prove the cut and cycle\nproperties by exchange arguments, use them to settle uniqueness, and meet the\noldest MST algorithm, Borůvka's, whose parallel component-merging rounds fall\nstraight out of the cut rule.\n",{"path":4720,"title":4721,"module":4705,"summary":4722},"\u002Falgorithms\u002Fgraphs\u002Fkruskal-and-prim","Kruskal and Prim","The two minimum-spanning-tree algorithms you will actually implement.\nKruskal grows a forest edge by edge, cheapest first, using a union-find\nstructure to reject cycle-closing edges; Prim grows one tree outward from a\nroot with a priority queue, exactly Dijkstra rekeyed by attachment cost. Both\ntraced in full on a nine-town graph, with the edge cases, the bottleneck\nproperty, and where each one wins.\n",{"path":4724,"title":4725,"module":4705,"summary":4726},"\u002Falgorithms\u002Fgraphs\u002Fshortest-paths","Shortest Paths","Finding the cheapest route through a weighted network is one of the most-used\nalgorithms in computing, and a single operation — _relaxation_ — underlies\nevery method. We build the primitive, prove the triangle inequality and\noptimal substructure that make it work, then meet Dijkstra's algorithm: the\ngreedy solution for non-negative weights, traced vertex by vertex, with the\ncut argument that proves each extraction is final.\n",{"path":4728,"title":4729,"module":4705,"summary":4730},"\u002Falgorithms\u002Fgraphs\u002Fall-pairs-and-negative-weights","All-Pairs and Negative Weights","Dijkstra's greedy schedule breaks the moment an edge goes negative. We give it\nup for dynamic programming: Bellman-Ford derived as a DP over edge budgets,\nwith its negative-cycle detector, and Floyd-Warshall computing the distance\nbetween _every_ pair of vertices via a DP over which vertices a path may pass\nthrough. We close with Johnson's algorithm and the arbitrage problems that\nnegative cycles encode.\n",{"path":4732,"title":4733,"module":4705,"summary":4734},"\u002Falgorithms\u002Fgraphs\u002Fnetwork-flow","Network Flow","How much can flow through a network from source to sink? We build flow\nnetworks with capacity and conservation constraints, increase a flow by\npushing along augmenting paths in the residual graph, and see how reverse\nedges let the algorithm undo earlier routing. Ford-Fulkerson and its BFS refinement\nEdmonds-Karp find a maximum flow, traced end to end on a worked network.\n",{"path":4736,"title":4737,"module":4705,"summary":4738},"\u002Falgorithms\u002Fgraphs\u002Fmax-flow-min-cut","Max-Flow Min-Cut and Applications","Why is the flow found when no augmenting path remains actually optimal? The\nanswer is a duality theorem: the maximum flow equals the minimum cut. We prove\nit, read the minimum cut off the final residual graph, then derive bipartite\nmatching and a catalog of modeling reductions from the flow\nabstraction — before touching the modern algorithms that supersede\nEdmonds-Karp.\n",{"path":4740,"title":4741,"module":4705,"summary":4742},"\u002Falgorithms\u002Fgraphs\u002Fbridges-and-articulation-points","Bridges & Articulation Points","A **bridge** is an edge whose removal disconnects the graph; an **articulation\npoint** is a vertex whose removal does. Both are single points of failure in a\nnetwork. A single depth-first search computes discovery times and **low-links**,\nand two local criteria — $low[v] > disc[u]$ for bridges, $low[v] \\ge disc[u]$\nfor cut vertices — find them all in $O(V+E)$.\n",{"path":4744,"title":4745,"module":4705,"summary":4746},"\u002Falgorithms\u002Fgraphs\u002Flowest-common-ancestor","Lowest Common Ancestor & Binary Lifting","Given a rooted tree, the lowest common ancestor of $u$ and $v$ is the deepest\nnode that is an ancestor of both. A naive walk answers one query in $O(h)$;\n**binary lifting** precomputes the $2^k$-th ancestor of every node in\n$O(n\\log n)$, then answers $k$-th-ancestor and LCA queries in $O(\\log n)$ each.\nWe derive both jumps, apply them to tree distance, and compare against the\nEuler-tour + RMQ and Tarjan offline alternatives.\n",{"path":4748,"title":4749,"module":4705,"summary":4750},"\u002Falgorithms\u002Fgraphs\u002Ftwo-sat","2-SAT via Implication Graphs","A boolean formula whose every clause has exactly two literals can be solved in\n_linear_ time — even though its three-literal cousin is NP-complete. The idea\nis to read each clause as a pair of implications, build a directed graph on the\n$2n$ literals, and ask a question we already know how to answer: which literals\nshare a strongly connected component? The formula is satisfiable iff no variable\nlands in the same SCC as its own negation, and the SCCs' topological order\nyields a satisfying assignment for free.\n",{"path":4752,"title":4753,"module":4705,"summary":4754},"\u002Falgorithms\u002Fgraphs\u002Feulerian-tours","Eulerian Tours","An **Eulerian tour** uses every _edge_ of a graph exactly once. We give the\nexact parity and balance conditions under which one exists (even degree\nfor undirected graphs, in-degree equal to out-degree for directed) and Hierholzer's\n$O(E)$ algorithm that constructs one by splicing closed sub-tours. We contrast\nthis sharply with the **Hamiltonian** problem (visit every _vertex_ once),\nwhich is NP-complete: visiting edges is easy, visiting vertices is hard.\n",{"path":4756,"title":4757,"module":4705,"summary":4758},"\u002Falgorithms\u002Fgraphs\u002Fbipartite-matching","Bipartite Matching","Pairing applicants to jobs, students to slots, files to disks: all are\n**maximum bipartite matching**. We solve it combinatorially with **augmenting\npaths** (Kuhn's algorithm, $O(VE)$), speed it up to $O(E\\sqrt V)$ with\n**Hopcroft–Karp**, and uncover the structure behind it — **König's theorem**\n(max matching equals min vertex cover) and **Hall's marriage theorem** (a\nperfect matching exists iff every set has enough neighbors).\n",{"path":4760,"title":4761,"module":4762,"summary":4763},"\u002Falgorithms\u002Fgreedy\u002Fthe-greedy-method","The Greedy Method","Greedy Algorithms","A greedy algorithm builds a solution one locally-best choice at a time and\nnever looks back. We isolate the two properties that make this work — the\ngreedy-choice property and optimal substructure — prove the canonical\nactivity-selection algorithm correct with an exchange argument, watch greedy\nfail on the 0\u002F1 knapsack, and glimpse matroids as the theory\nthat says exactly when the greedy method is optimal.\n",{"path":4765,"title":4766,"module":4762,"summary":4767},"\u002Falgorithms\u002Fgreedy\u002Fscheduling-and-intervals","Scheduling & Interval Partitioning","Three classic scheduling problems all yield to greedy algorithms — and all\nthree turn on a single design decision: which key to sort by. Interval\nscheduling sorts by **finish** time to pack the most compatible jobs;\ninterval partitioning sorts by **start** time and proves the rooms needed\nequal the maximum overlap **depth**; minimizing maximum lateness sorts by\n**deadline** and is justified by an adjacent-swap exchange argument.\n",{"path":4769,"title":4770,"module":4762,"summary":4771},"\u002Falgorithms\u002Fgreedy\u002Fhuffman-codes","Huffman Codes","Huffman coding builds a\nprovably optimal prefix-free binary code by repeatedly merging the two least\nfrequent symbols. We develop prefix-free codes as binary trees, give the\nalgorithm with a priority queue, build a Huffman tree from example\nfrequencies, prove optimality with the same greedy-choice-plus-substructure\nargument, and pin the running time at $O(n\\log n)$.\n",{"path":4773,"title":4774,"module":4762,"summary":4775},"\u002Falgorithms\u002Fgreedy\u002Fmatroids","Matroids & Exchange Arguments","The capstone of the greedy module: _why_ and _when_ a greedy algorithm is\nprovably optimal. We recap the two correctness templates — **greedy-stays-ahead**\nand the **exchange argument** — then meet the **matroid** $M=(S,\\mathcal{I})$, an\nabstraction whose **exchange property** is the structure greedy needs.\nThe matroid–greedy theorem says sorting by weight and taking what stays\nindependent yields a maximum-weight basis _if and only if_ the structure is a\nmatroid. Kruskal's MST is the canonical instance; 0\u002F1 knapsack and TSP are the\ncanonical failures.\n",{"path":4777,"title":4778,"module":4762,"summary":4779},"\u002Falgorithms\u002Fgreedy\u002Fstable-matching","Stable Matching (Gale–Shapley)","Two sides each rank the other; we want a matching with no **blocking pair** — no\ntwo participants who both prefer each other to their assigned partners. The\n**Gale–Shapley deferred-acceptance** algorithm has proposers propose in\npreference order while receivers tentatively hold the best offer so far. We prove\nit terminates in $\\O(n^2)$ proposals, returns a **perfect** matching, and that\nthe matching is **stable**. A sharper asymmetry follows: deferred acceptance is\n**proposer-optimal** and **receiver-pessimal**, the structural fact behind the\nresidency match and school-choice systems.\n",{"path":4781,"title":4782,"module":4783,"summary":4784},"\u002Falgorithms\u002Fdynamic-programming\u002Fprinciples","Principles of Dynamic Programming","Dynamic Programming","Dynamic programming is recursion with memory: when a recursive solution\nre-solves the same subproblems again and again, we solve each one once and\nstore the answer. We identify the two structural conditions that make this\nwork — overlapping subproblems and optimal substructure — contrast top-down\nmemoization with bottom-up tabulation, and distil the whole method into a\nfive-step recipe.\n",{"path":4786,"title":4787,"module":4783,"summary":4788},"\u002Falgorithms\u002Fdynamic-programming\u002Fsequence-dp","Sequence Alignment & LCS","Two strings can be compared by how much of one appears inside the\nother. The longest common subsequence (LCS) and edit distance are the two\nclassic measures, and they are the _same_ dynamic program with different\ncosts. We derive the LCS recurrence by examining the last characters, fill a\nworked DP table, reconstruct the subsequence, and then show edit distance as\nthe identical $\\Theta(mn)$ pattern.\n",{"path":4790,"title":4791,"module":4783,"summary":4792},"\u002Falgorithms\u002Fdynamic-programming\u002Flongest-increasing-subsequence","Longest Increasing Subsequence","Given a sequence of numbers, how long is its longest strictly increasing\nsubsequence? A first dynamic program indexes subproblems by the element each\nsubsequence _ends at_, giving an $O(n^2)$ solution with parent-pointer\nreconstruction. A sharper idea, the patience-sorting _tails_ array searched by\nbinary search, drops the time to $O(n\\log n)$. We then fold in the\nvariants: non-decreasing, counting, Russian-doll envelopes, and bitonic.\n",{"path":4794,"title":4795,"module":4783,"summary":4796},"\u002Falgorithms\u002Fdynamic-programming\u002Fknapsack","Knapsack & Subset Problems","We start from $\\textsc{Subset-sum}$ — does some sublist hit a target $t$? — and its\ninclude\u002Fexclude recurrence over a boolean table $A(i, u)$, then bolt on values\nto get 0\u002F1 knapsack as the same machine with $\\lor$ promoted to $\\max$. We fill\nboth tables, recover the chosen items, and confront the surprise that the\n$\\Theta(nt)$ running time is only _pseudo-polynomial_ — exponential in the bit\nlength $b$, and unimprovable unless $\\mathrm{P}=\\mathrm{NP}$ since subset-sum is\n$\\textsc{NP-complete}$. The fractional variant reveals the sharp line between greedy\nand dynamic programming.\n",{"path":4798,"title":4799,"module":4783,"summary":4800},"\u002Falgorithms\u002Fdynamic-programming\u002Fcoin-change-and-unbounded","Coin Change & Unbounded Knapsack","The previous lesson let each item be taken at most once. Drop that cap — items\nmay be reused _any number of times_ — and the 0\u002F1 knapsack collapses from a\ntwo-dimensional table to a one-dimensional one, because there is no longer a\nprefix of \"already-used\" items to track. We meet **unbounded knapsack**, then\nits most famous instance, **coin change**: the minimum-coins recurrence\n$C[a] = 1 + \\min_c C[a-c]$, and the counting variant where the _order of the\nloops_ decides whether you count unordered combinations or ordered sequences —\nthe classic bug. Greed fails in general but works for canonical coin systems.\n",{"path":4802,"title":4803,"module":4783,"summary":4804},"\u002Falgorithms\u002Fdynamic-programming\u002Finterval-dp","Interval DP","Many problems ask for the best way to combine a contiguous range of items, and\nthe answer is a dynamic program over subintervals $[i,j]$ that chooses a split\npoint $k$. We derive the pattern from matrix-chain multiplication —\nparenthesising a product to minimize scalar multiplications in $O(n^3)$ — distil\nit into a reusable template filled by increasing interval length, and then meet\nits sharpest variant: the \"last operation\" trick behind Burst Balloons and\ncutting a stick, where fixing the _last_ move (not the first) makes the two\nsides independent.\n",{"path":4806,"title":4807,"module":4783,"summary":4808},"\u002Falgorithms\u002Fdynamic-programming\u002Ftree-dp","Dynamic Programming on Trees","When the subproblems of a dynamic program are _rooted subtrees_, a single\npost-order DFS solves the whole thing in $O(n)$: each node combines the\nalready-computed answers of its children. We meet the archetype — maximum-weight\nindependent set on a tree — then the \"path through a node\" pattern behind tree\ndiameter and maximum path sum, and finally **rerooting**, which computes a\nper-node answer for _every_ node as root in $O(n)$ with two passes.\n",{"path":4810,"title":4811,"module":4783,"summary":4812},"\u002Falgorithms\u002Fdynamic-programming\u002Fbitmask-dp","Bitmask DP","When a subproblem depends not on an index or a prefix but on _which subset_ of\na small ground set has been used, we can encode that subset as the bits of an\ninteger and index a DP table by it. With $n \\le \\sim 20$ the $2^n$ subsets fit\nin a table, turning $\\Theta(n!)$ brute force into $O(2^n \\cdot \\text{poly}(n))$.\nWe meet the bit tricks, the Held–Karp TSP archetype, assignment by mask,\nsubset-sum partitioning, and submask enumeration with its $3^n$ bound.\n",{"path":4814,"title":4815,"module":4783,"summary":4816},"\u002Falgorithms\u002Fdynamic-programming\u002Fdp-optimizations","DP Optimizations","A correct DP recurrence is only half the battle; its naive evaluation is often\na factor of $n$ slower than necessary. This capstone surveys five techniques,\nmonotonic-queue, the convex hull trick, divide-and-conquer optimization,\nKnuth's optimization, and SOS DP, that each exploit _structure in the\ntransition_ (a sliding window, linear costs, monotone optimal splits, the\nquadrangle inequality, or subset lattices) to shave an $O(n)$, $O(\\log n)$, or\nworse factor off the running time.\n",{"path":4818,"title":4819,"module":4783,"summary":4820},"\u002Falgorithms\u002Fdynamic-programming\u002Fdp-on-graphs","Dynamic Programming on Graphs","Many graph algorithms are dynamic programs: the subproblem is the\n_best value reachable under a restricted resource_ — intermediate vertices\nallowed, edges allowed, or a topological prefix — and edge _relaxation_ is the\nDP transition. We frame Floyd–Warshall as the archetype ($O(V^3)$ all-pairs\nshortest paths), Bellman–Ford as a DP over path length (the at-most-$K$-stops\nvariant), DAG-DP in topological order ($O(V+E)$), and Warshall's transitive\nclosure as the boolean analog.\n",{"path":4822,"title":4823,"module":4783,"summary":4824},"\u002Falgorithms\u002Fdynamic-programming\u002Fdigit-and-probability-dp","Digit & Probability DP","Two DP patterns with unusual state. _Digit DP_ counts the\nintegers in a range $[L, R]$ that satisfy a digit constraint by walking the\ndecimal places of the bound, carrying a _tight_ flag that marks when the prefix\nstill equals the bound's. _Probability\u002FExpectation DP_ replaces \"best value\" with\n\"expected value,\" using linearity of expectation to make each state an\naverage over its weighted transitions — the natural tool for expected step\ncounts and absorbing Markov chains.\n",{"path":4826,"title":4827,"module":4828,"summary":4829},"\u002Falgorithms\u002Fbacktracking\u002Fbacktracking-fundamentals","Backtracking: Subsets, Permutations & Combinations","Backtracking & Search","Backtracking builds a solution one choice at a time and abandons a partial\nsolution the moment it cannot be completed, exploring a state-space tree by\ndepth-first search. We meet the universal choose\u002Fexplore\u002Fun-choose template,\nderive the canonical enumerations — subsets ($2^n$), permutations ($n!$), and\ncombinations ($\\binom{n}{k}$) — handle duplicate elements by skipping equal\nsiblings, and see how pruning turns an exponential search into a tractable one.\n",{"path":4831,"title":4832,"module":4828,"summary":4833},"\u002Falgorithms\u002Fbacktracking\u002Fconstraint-search","Constraint Search: N-Queens & Sudoku","Many hard puzzles are **constraint satisfaction problems**: assign each\nvariable a value from its domain so that every constraint holds. Backtracking\nsolves them by assigning variables one at a time and rejecting a partial\nassignment the instant a constraint breaks. We make the rejection cheap — $O(1)$\nconflict checks for N-Queens via column and diagonal sets — and prune harder\nwith **forward checking**, **MRV** ordering, and **constraint propagation**,\nwhich is what lets an exponential search actually finish.\n",{"path":4835,"title":4836,"module":4828,"summary":4837},"\u002Falgorithms\u002Fbacktracking\u002Fbranch-and-bound","Branch & Bound and Meet in the Middle","Plain backtracking prunes a search tree by _feasibility_; for _optimization_\nproblems we can prune far more aggressively by _value_. **Branch and bound**\nkeeps the best complete solution found so far and discards any partial solution\nwhose optimistic bound cannot beat it. **Meet in the middle** splits the\ninstance in two, enumerates each half, and recombines by binary search — turning\n$2^n$ into $O(2^{n\u002F2}\\,n)$ and pushing exact search out to $n \\approx 40$.\n",{"path":4839,"title":4840,"module":4828,"summary":4841},"\u002Falgorithms\u002Fbacktracking\u002Fgraph-backtracking","Graph Backtracking: m-Coloring & Hamiltonian Paths","Two famous graph problems have no known efficient algorithm, yet yield cleanly\nto backtracking with the right pruning. **Graph $m$-coloring** assigns one of\n$m$ colors to each vertex so no edge is monochromatic; we color vertices in turn\nand reject a color the instant a neighbor already has it. **Hamiltonian\npath\u002Fcycle** asks for a walk visiting every vertex exactly once; we extend a path\ngreedily and backtrack on dead ends. Both are NP-complete, so the worst case is\nexponential — but feasibility pruning and good vertex ordering make real\ninstances tractable, and the contrast with the easy Eulerian condition shows why.\n",{"path":4843,"title":4844,"module":4845,"summary":4846},"\u002Falgorithms\u002Fmathematical-algorithms\u002Fnumber-theory-basics","Number Theory: GCD & Modular Arithmetic","Mathematical Algorithms","This lesson opens the mathematical-algorithms module with the bedrock of\ncomputational number theory. We prove Euclid's recurrence\n$\\gcd(a,b)=\\gcd(b,\\,a\\bmod b)$ and its $O(\\log\\min(a,b))$ running time, extend\nit to recover Bézout coefficients $x,y$ with $ax+by=\\gcd(a,b)$, and build\nmodular arithmetic on residue classes — including when a modular inverse\n$a^{-1}\\bmod m$ exists and how to compute it.\n",{"path":4848,"title":4849,"module":4845,"summary":4850},"\u002Falgorithms\u002Fmathematical-algorithms\u002Fmodular-exponentiation-and-primality","Modular Exponentiation & Primality","Computing $a^n \\bmod m$ naively costs $n$ multiplications; **repeated squaring**\ndoes it in $O(\\log n)$ by reading the bits of the exponent. We use this routine\nto state **Fermat's little theorem** (and the modular inverse it gives), then to\ntest primality — trial division, the probabilistic **Fermat** and **Miller–Rabin**\ntests, and the deterministic witness set that settles primality for every 64-bit\nnumber.\n",{"path":4852,"title":4853,"module":4845,"summary":4854},"\u002Falgorithms\u002Fmathematical-algorithms\u002Fsieve-and-factorization","Sieves & Factorization","The previous lesson tested one number for primality; here we ask for _all_\nprimes up to $n$ at once. The **sieve of Eratosthenes** cross-cuts composites\nin $O(n\\log\\log n)$, and a **linear sieve** does it in $O(n)$ while recording\neach number's **smallest prime factor**, which then factors any $x \\le n$ in\n$O(\\log x)$. From a factorization $x = \\prod p_i^{e_i}$ the multiplicative\nfunctions $\\tau$, $\\sigma$, and Euler's totient $\\varphi$ fall out immediately.\n",{"path":4856,"title":4857,"module":4845,"summary":4858},"\u002Falgorithms\u002Fmathematical-algorithms\u002Fcombinatorics","Combinatorics & Counting","Counting is the arithmetic of finite sets. We build up from permutations\n$n!$ and combinations $\\binom{n}{k}$, prove Pascal's rule by a bijection,\nand count multisets with stars and bars. The practical core is computing\n$\\binom{n}{k}\\bmod p$ in $O(1)$ from precomputed factorials and inverse\nfactorials. We close with inclusion–exclusion and the Chinese Remainder\nTheorem, both of which lean on the modular inverse from the previous lesson.\n",{"path":4860,"title":4861,"module":4845,"summary":4862},"\u002Falgorithms\u002Fmathematical-algorithms\u002Fmatrix-exponentiation","Matrix Exponentiation","A linear recurrence advances by a fixed linear rule, so one step is a\n**matrix–vector** product and $n$ steps are a **matrix power**. Packaging\nFibonacci, and any $k$-term recurrence, into a transition matrix lets us jump\nto the $n$-th term in $O(k^3 \\log n)$ by **exponentiation by squaring** — the\nsame doubling trick from modular exponentiation, now over matrices.\n",{"path":4864,"title":4865,"module":4845,"summary":4866},"\u002Falgorithms\u002Fmathematical-algorithms\u002Ffast-fourier-transform","Fast Fourier Transform","Multiplying two degree-$n$ polynomials by the schoolbook method costs\n$\\Theta(n^2)$. Evaluating them at the **$n$-th roots of unity** turns\nmultiplication into pointwise products, and the **Cooley–Tukey FFT** computes\nall those evaluations in $\\Theta(n\\log n)$ by splitting even and odd\ncoefficients. The inverse FFT interpolates back, giving $\\Theta(n\\log n)$\npolynomial and big-integer multiplication.\n",{"path":4868,"title":4869,"module":4845,"summary":4870},"\u002Falgorithms\u002Fmathematical-algorithms\u002Fgradient-descent","Numerical Optimization and Gradient Descent","Most of this course chases **discrete** optima over finite structures; here the\nsearch space is **continuous** and the objective $f$ is differentiable. The\n**gradient** points uphill, so stepping against it —\n$x_{t+1} = x_t - \\eta\\,\\nabla f(x_t)$ — walks downhill. **Convexity** makes every\nlocal minimum global; for convex $L$-smooth $f$ gradient descent converges at\n$O(1\u002Ft)$, and **geometrically** under strong convexity. **Newton's method** uses\nthe Hessian for local quadratic convergence, and **bisection** is the robust\nbracketing fallback for roots.\n",{"path":4872,"title":4873,"module":4874,"summary":4875},"\u002Falgorithms\u002Fcomputational-geometry\u002Fgeometric-primitives","Geometric Primitives & Orientation","Computational Geometry","Computational geometry is built on a single reliable primitive — the\n**orientation test**, a sign of a cross product that tells whether three points\nturn left, right, or lie collinear. From points-as-vectors and the dot and\ncross products we derive orientation, segment intersection, the shoelace area\nformula, and point-in-polygon tests, keeping all arithmetic **exact and\ninteger** so that no floating-point rounding can corrupt a sign.\n",{"path":4877,"title":4878,"module":4874,"summary":4879},"\u002Falgorithms\u002Fcomputational-geometry\u002Fconvex-hull","Convex Hull","The convex hull is the smallest convex polygon enclosing a point set — the\nrubber band snapped around the nails. We build it with Andrew's monotone chain,\nsorting by $(x,y)$ and sweeping a lower and upper hull while popping any\nnon-left turn via the orientation primitive, in $O(n\\log n)$. A reduction from\nsorting shows that bound is optimal, and the hull yields diameter, smallest\nenclosing rectangle, and more through rotating calipers.\n",{"path":4881,"title":4882,"module":4874,"summary":4883},"\u002Falgorithms\u002Fcomputational-geometry\u002Fsweep-line","Sweep-Line Algorithms","The plane-sweep paradigm turns a static $2$-D geometry problem into a dynamic\n$1$-D ordered-set problem: a vertical line sweeps left to right, stopping at an\n$x$-sorted **event queue** while a balanced-BST **status structure** tracks the\nobjects it currently crosses, ordered by $y$. We derive Bentley–Ottmann segment\nintersection in $O((n+k)\\log n)$, recover closest-pair in $O(n\\log n)$, and\nreduce skyline, rectangle-area, and overlap problems to $\\pm1$ event sweeps.\n",{"path":4885,"title":4886,"module":4874,"summary":4887},"\u002Falgorithms\u002Fcomputational-geometry\u002Fpolygons-and-proximity","Polygons & Proximity","Four classics that live on top of the orientation primitive and the convex\nhull. **Closest pair** falls to divide-and-conquer in $\\Theta(n\\log n)$, where a\npacking argument caps the cross-boundary combine at seven neighbours per point.\n**Point-in-polygon** is the ray-casting parity test or the winding-number count\nthat also handles self-intersecting boundaries, both with their edge caveats. The **shoelace formula**\ngives signed area as a sum of cross products, and **rotating calipers** walk the\nhull to read off diameter and width in $O(n)$.\n",{"path":4889,"title":4890,"module":4891,"summary":4892},"\u002Falgorithms\u002Fintractability\u002Fp-np-reductions","P, NP, and Reductions","Intractability","Most problems we have met so far have fast algorithms. A vast and important\nfamily seemingly does not. This lesson builds the vocabulary for that\ndivide: decision problems, the class $\\mathsf{P}$ of problems we can solve\nquickly, the class $\\mathsf{NP}$ of problems whose solutions we can _check_\nquickly, and polynomial-time reductions, the tool that lets us compare the\ndifficulty of two problems without solving either.\n",{"path":4894,"title":4895,"module":4891,"summary":4896},"\u002Falgorithms\u002Fintractability\u002Fnp-completeness","NP-Completeness","Some problems in $\\mathsf{NP}$ are universally hardest: every other problem\nin $\\mathsf{NP}$ reduces to them. This lesson defines $\\mathsf{NP}$-hard and\n$\\mathsf{NP}$-complete, states the Cook–Levin theorem that anchors the\ntheory on **SAT**, walks the web of reductions that grows from it, and gives\nthe four-step recipe for proving a brand-new problem $\\mathsf{NP}$-complete.\n",{"path":4898,"title":4899,"module":4891,"summary":4900},"\u002Falgorithms\u002Fintractability\u002Fcoping-with-hardness","Coping with NP-Hardness","An $\\mathsf{NP}$-hardness proof rules out an exact polynomial-time algorithm,\nnot the need for answers. This lesson surveys four practical responses to\nhardness: approximation algorithms with a provable ratio (worked through a\n2-approximation for vertex cover), heuristics and local search, exact\nexponential methods like branch and bound, and exploiting special structure\nin the instances you actually face.\n",{"path":4902,"title":4903,"module":4891,"summary":4904},"\u002Falgorithms\u002Fintractability\u002Fapproximation-algorithms","Approximation Algorithms","When a problem is $\\mathsf{NP}$-hard we can still ask for a solution\nprovably close to optimal. This lesson makes the approximation ratio\n$\\rho$ precise, separates absolute from relative guarantees, and proves the\nratios of four classic algorithms: greedy set cover ($H_n \\approx \\ln n$),\nthe MST-doubling $2$-approximation for metric TSP, load balancing, and the\nknapsack FPTAS. It closes with the hierarchy PTAS \u002F FPTAS and the limits of\ninapproximability.\n",{"path":4906,"title":4907,"module":6,"summary":6},"\u002Falgorithms","Algorithms",{"path":4909,"title":4910,"module":4911,"summary":4912},"\u002Fcalculus\u002Flimits-and-continuity\u002Ffunctions-and-models","Functions and Mathematical Models","Limits and Continuity","A function assigns exactly one output to each input and can be presented four ways: verbally, numerically, graphically, or by a formula. The elementary families — linear, polynomial, power, rational, trigonometric, exponential — model most elementary phenomena, and transformation, combination, and composition build every other function from them.\n",{"path":4914,"title":4915,"module":4911,"summary":4916},"\u002Fcalculus\u002Flimits-and-continuity\u002Fthe-limit-of-a-function","The Limit of a Function","The tangent and velocity problems both ask for a value a ratio approaches but never reaches — the limit. Its intuitive two-sided form splits into one-sided limits that must agree; a limit fails to exist when they disagree or when the function grows without bound, the latter producing a vertical asymptote.\n",{"path":4918,"title":4919,"module":4911,"summary":4920},"\u002Fcalculus\u002Flimits-and-continuity\u002Flimit-laws-and-the-precise-definition","Limit Laws and the ε–δ Definition","The Limit Laws reduce a limit to arithmetic on simpler limits, and direct substitution settles polynomials and rational functions outright. The 0\u002F0 forms that resist substitution yield to algebra or the Squeeze Theorem, and the ε–δ definition makes \"arbitrarily close\" precise as a pair of quantified inequalities.\n",{"path":4922,"title":4923,"module":4911,"summary":4924},"\u002Fcalculus\u002Flimits-and-continuity\u002Fcontinuity","Continuity","A function is continuous at a point when its limit there equals its value, so the graph has no break. Continuity fails in three geometric ways; it is closed under arithmetic and composition, so the elementary families and their combinations are continuous; and on a closed interval it forces the Intermediate Value Theorem, which locates roots.\n",{"path":4926,"title":4927,"module":4928,"summary":4929},"\u002Fcalculus\u002Fderivatives\u002Fthe-derivative-and-rates-of-change","The Derivative and Rates of Change","Derivatives","A single limit with three readings: the slope of the tangent line, the instantaneous velocity of a moving object, and the rate of change of one quantity with respect to another. Built from the difference quotient, extended from a value at one point to a function of x, and undefined exactly where a corner, jump, or vertical tangent appears.\n",{"path":4931,"title":4932,"module":4928,"summary":4933},"\u002Fcalculus\u002Fderivatives\u002Fdifferentiation-rules-and-the-chain-rule","Differentiation Rules and the Chain Rule","Computing every derivative from the limit definition is tedious. A short list of rules — power, constant multiple, sum, product, quotient — differentiates any polynomial or rational function by inspection. The trigonometric derivatives follow from one limit, and the chain rule extends everything to composite functions by multiplying rates along the composition.\n",{"path":4935,"title":4936,"module":4928,"summary":4937},"\u002Fcalculus\u002Fderivatives\u002Fimplicit-differentiation-and-related-rates","Implicit Differentiation and Related Rates","Not every curve is the graph of y = f(x). Implicit differentiation finds a slope from an equation in x and y directly, treating y as an unknown function and differentiating both sides. The same chain-rule idea drives related rates, where one measured rate of change forces another through a geometric constraint, and interprets the derivative as a rate across the sciences.\n",{"path":4939,"title":4940,"module":4928,"summary":4941},"\u002Fcalculus\u002Fderivatives\u002Flinear-approximations-and-differentials","Linear Approximations and Differentials","A differentiable curve looks like its tangent line under enough magnification, so the tangent is a usable stand-in for the function near the point of contact. The linear approximation and its linearization, written in the language of differentials dy and dx, estimate both function values and the measurement error propagated into a computed quantity.\n",{"path":4943,"title":4944,"module":4945,"summary":4946},"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fextrema-and-the-mean-value-theorem","Extrema and the Mean Value Theorem","Applications of Derivatives","Absolute and local extrema, the Extreme Value Theorem that guarantees them, and Fermat's Theorem pinning candidates to critical numbers. The Closed Interval Method turns the search for extrema into a finite checklist. Rolle's Theorem and the Mean Value Theorem then connect a function's values to its derivative, giving the tool that most of differential calculus rests on.\n",{"path":4948,"title":4949,"module":4945,"summary":4950},"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fhow-derivatives-shape-a-graph","How Derivatives Shape a Graph","The sign of the first derivative fixes where a function rises and falls, and a sign change identifies each local extremum through the First Derivative Test. The second derivative sets concavity and inflection points and gives a faster Second Derivative Test. Limits at infinity describe end behavior and the horizontal asymptotes a curve settles toward.\n",{"path":4952,"title":4953,"module":4945,"summary":4954},"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fcurve-sketching-and-optimization","Curve Sketching and Optimization","A checklist that synthesizes domain, symmetry, asymptotes, monotonicity, extrema, and concavity into a hand sketch of any function, plus the slant asymptote for rational functions whose degree exceeds the denominator's. The same extremum machinery, applied to a word problem, becomes the optimization template: model one quantity, reduce it to a function of a single variable, and find its absolute extremum.\n",{"path":4956,"title":4957,"module":4945,"summary":4958},"\u002Fcalculus\u002Fapplications-of-derivatives\u002Fnewtons-method-and-antiderivatives","Newton's Method and Antiderivatives","Newton's method solves $f(x) = 0$ by repeatedly replacing the curve with its tangent line and jumping to the tangent's root, converging fast when it works and diverging when the derivative is small. Antiderivatives reverse differentiation: every antiderivative of a function differs from another by a constant, so the general antiderivative is a family of parallel curves, pinned to one by an initial condition.\n",{"path":4960,"title":4961,"module":4962,"summary":4963},"\u002Fcalculus\u002Fintegrals\u002Farea-and-the-definite-integral","Area and the Definite Integral","Integrals","The area under a curve is defined as a limit of sums of rectangle areas. The same limit — a Riemann sum taken as the mesh shrinks to zero — defines the definite integral, a single number measuring signed area, total distance, and every accumulated quantity built the same way. Its properties, comparison bounds, and reading as net area follow directly from the limit.\n",{"path":4965,"title":4966,"module":4962,"summary":4967},"\u002Fcalculus\u002Fintegrals\u002Fthe-fundamental-theorem-of-calculus","The Fundamental Theorem of Calculus","Differentiation and integration are inverse operations. Part 1 says the derivative of an area-accumulation function is the integrand; Part 2 says a definite integral equals the change in any antiderivative across the interval. Together they replace limits of Riemann sums with antiderivative lookups, define the indefinite integral, and give the Net Change Theorem for rates.\n",{"path":4969,"title":4970,"module":4962,"summary":4971},"\u002Fcalculus\u002Fintegrals\u002Fthe-substitution-rule","The Substitution Rule","Substitution runs the Chain Rule backward: spotting an inner function whose derivative also appears in the integrand lets the variable change to $u$ and collapse a composite integral to a simple one. The rule applies to indefinite and definite integrals, with two ways to handle the limits, and it yields the symmetry shortcuts that double even integrands and vanish odd ones.\n",{"path":4973,"title":4974,"module":4975,"summary":4976},"\u002Fcalculus\u002Fapplications-of-integration\u002Fareas-and-volumes","Areas Between Curves and Volumes","Applications of Integration","A definite integral computes any quantity that a limit of Riemann sums approximates. Applied to geometry it gives the area between two curves and the volume of a solid: by cross-sections, by disks and washers when the region is revolved, and by cylindrical shells when inverting the boundary is awkward.\n",{"path":4978,"title":4979,"module":4975,"summary":4980},"\u002Fcalculus\u002Fapplications-of-integration\u002Fwork-average-value-and-arc-length","Work, Average Value, Arc Length, and Surface Area","The work done by a force that varies with position, the average value of a function and the Mean Value Theorem it satisfies, the length of a curve, and the area of a surface swept out by revolving that curve. Each is a limit of Riemann sums, hence a definite integral.\n",{"path":4982,"title":4983,"module":4975,"summary":4984},"\u002Fcalculus\u002Fapplications-of-integration\u002Fphysics-economics-and-probability","Applications to Physics, Economics, and Probability","Definite integrals in physics, economics, and statistics: the force a fluid exerts on a submerged plate, the balance point of a plane region, the money consumers save at a market price, and the probability that a continuous random variable lands in an interval, together with its mean.\n",{"path":4986,"title":4987,"module":4988,"summary":4989},"\u002Fcalculus\u002Fexponential-logarithmic-and-inverse-functions\u002Finverse-functions-logarithms-and-exponentials","Inverse Functions, Logarithms, and Exponentials","Exponential, Logarithmic, and Inverse Functions","A one-to-one function has an inverse that reverses it, with a graph mirrored across y = x and a derivative given by the reciprocal-slope rule. The exponential e^x is its own derivative and the natural logarithm has derivative 1\u002Fx; logarithmic differentiation turns products, quotients, and variable powers into sums.\n",{"path":4991,"title":4992,"module":4988,"summary":4993},"\u002Fcalculus\u002Fexponential-logarithmic-and-inverse-functions\u002Fgrowth-decay-inverse-trig-and-hyperbolic-functions","Growth, Decay, Inverse Trigonometric, and Hyperbolic Functions","Any quantity whose rate of change is proportional to its size grows or decays exponentially, the single equation y' = ky behind populations, radioactive decay, cooling, and continuously compounded interest. The inverse trigonometric functions have algebraic derivatives, and the hyperbolic functions, built from e^x and e^{-x}, describe the hanging cable.\n",{"path":4995,"title":4996,"module":4988,"summary":4997},"\u002Fcalculus\u002Fexponential-logarithmic-and-inverse-functions\u002Flhospitals-rule","Indeterminate Forms and l'Hospital's Rule","When a limit produces 0\u002F0 or infinity over infinity, the value is undetermined by the forms alone. l'Hospital's Rule resolves both by replacing the ratio of functions with the ratio of their derivatives. Products, differences, and powers reduce to a quotient the rule can handle, and repeated use ranks the growth of logarithms, powers, and exponentials.\n",{"path":4999,"title":5000,"module":5001,"summary":5002},"\u002Fcalculus\u002Ftechniques-of-integration\u002Fintegration-by-parts","Integration by Parts","Techniques of Integration","The product rule for derivatives reverses into integration by parts, trading the integral of $u\\,\\d v$ for the integral of $v\\,\\d u$ whenever the second is easier. The LIATE ordering fixes which factor to differentiate. Standard cases: a polynomial against a transcendental factor, repeated parts, cyclic integrals that solve for themselves, and reduction formulas that peel an exponent down by recursion.\n",{"path":5004,"title":5005,"module":5001,"summary":5006},"\u002Fcalculus\u002Ftechniques-of-integration\u002Ftrigonometric-integrals-and-substitution","Trigonometric Integrals and Substitution","Two related techniques. Trigonometric integrals evaluate powers and products of sine, cosine, tangent, and secant by splitting off one factor and converting the rest with a Pythagorean identity, or by dropping even powers with half-angle formulas. Trigonometric substitution runs the idea in reverse: replace x by a sine, tangent, or secant to clear a radical, integrate, then read the answer back off a reference triangle.\n",{"path":5008,"title":5009,"module":5001,"summary":5010},"\u002Fcalculus\u002Ftechniques-of-integration\u002Fpartial-fractions-and-integration-strategy","Partial Fractions and Integration Strategy","Any rational function integrates in closed form: factor the denominator, split the fraction into simple pieces by partial fractions, and integrate each piece as a logarithm or an arctangent. Four denominator cases exhaust the possibilities. A four-step strategy then sorts an arbitrary integrand by its shape to the technique that fits it, and a short catalog records elementary functions whose antiderivatives are not elementary.\n",{"path":5012,"title":5013,"module":5001,"summary":5014},"\u002Fcalculus\u002Ftechniques-of-integration\u002Fapproximate-and-improper-integrals","Approximate and Improper Integrals","Two definite integrals the Fundamental Theorem cannot reach. With no antiderivative available, the Midpoint, Trapezoidal, and Simpson rules approximate the integral from sample values, each carrying a provable error bound. With an infinite interval or an integrand that blows up, the improper integral is defined as a limit that either converges or diverges; the Comparison Test settles which without evaluating it.\n",{"path":5016,"title":5017,"module":5018,"summary":5019},"\u002Fcalculus\u002Fparametric-and-polar\u002Fparametric-curves-and-their-calculus","Parametric Curves and Their Calculus","Parametric Equations and Polar Coordinates","A parametric curve gives x and y separately as functions of a third variable, recording not only a path but the direction and timing with which it is traced. Eliminating the parameter recovers a Cartesian equation; the slope, area, arc-length, and surface-area formulas run directly on the parameter, with the cycloid and astroid as worked examples.\n",{"path":5021,"title":5022,"module":5018,"summary":5023},"\u002Fcalculus\u002Fparametric-and-polar\u002Fpolar-coordinates","Polar Coordinates","Polar coordinates locate a point by a distance from the pole and an angle from the polar axis, giving circles, spirals, and flower-shaped curves short equations. Conversion between the two systems is right-triangle trigonometry, and treating a polar curve as a parametric curve in the angle yields the tangent, area, and arc-length formulas.\n",{"path":5025,"title":5026,"module":5018,"summary":5027},"\u002Fcalculus\u002Fparametric-and-polar\u002Fconic-sections","Conic Sections","Parabolas, ellipses, and hyperbolas are the plane curves cut from a double cone. Each has a focus-based geometric definition and a standard Cartesian equation. A single number, the eccentricity, ties the three together, and placing a focus at the pole gives all of them one polar equation that describes planetary orbits.\n",{"path":5029,"title":5030,"module":5031,"summary":5032},"\u002Fcalculus\u002Fsequences-and-series\u002Fsequences","Sequences","Infinite Sequences and Series","A sequence is a function on the positive integers, and its limit is defined almost exactly like a limit at infinity. The Limit Laws and Squeeze Theorem carry over from functions, monotonic and bounded sequences give a convergence criterion, and the Monotonic Sequence Theorem guarantees a limit exists without naming it.\n",{"path":5034,"title":5035,"module":5031,"summary":5036},"\u002Fcalculus\u002Fsequences-and-series\u002Fseries-and-the-integral-test","Series and the Integral Test","Adding infinitely many terms is made precise as the limit of partial sums. The two series with closed-form partial sums are geometric and telescoping; the harmonic series diverges even as its terms shrink to zero. The Integral Test compares a positive series to an improper integral, settling the p-series and supplying a remainder bound for estimating sums.\n",{"path":5038,"title":5039,"module":5031,"summary":5040},"\u002Fcalculus\u002Fsequences-and-series\u002Fthe-convergence-tests","The Convergence Tests","The comparison, alternating-series, ratio, and root tests decide convergence without a closed-form partial sum. Absolute convergence is stronger than conditional convergence and is preserved under rearrangement; an alternating series errs by less than its first omitted term. A test is chosen from the shape of the general term.\n",{"path":5042,"title":5043,"module":5031,"summary":5044},"\u002Fcalculus\u002Fsequences-and-series\u002Fpower-series","Power Series","A power series is a polynomial of infinite degree whose convergence set is an interval centered at $a$, with a radius the Ratio Test finds and endpoints that must be tested by hand. Inside that interval the series represents a function that can be differentiated and integrated term by term, generating new representations from the geometric series.\n",{"path":5046,"title":5047,"module":5031,"summary":5048},"\u002Fcalculus\u002Fsequences-and-series\u002Ftaylor-and-maclaurin-series","Taylor and Maclaurin Series","If a function equals a power series, its coefficients are forced: the nth is the nth derivative at the center over n factorial. We derive that formula, use Taylor's Inequality to prove the standard series for the exponential, sine, and cosine, record the binomial series and a reference table, and bound the error when a Taylor polynomial replaces a function.\n",{"path":5050,"title":5051,"module":5052,"summary":5053},"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fvectors-and-the-dot-product","Three-Dimensional Coordinates, Vectors, and the Dot Product","Vectors and the Geometry of Space","Space needs three coordinates, so we set up the rectangular system, the distance formula, and the equation of a sphere. Vectors then package magnitude and direction into a single algebraic object with its own arithmetic. The dot product turns two vectors into a number that measures the angle between them, gives a clean test for orthogonality, and produces the projection of one vector onto another.\n",{"path":5055,"title":5056,"module":5052,"summary":5057},"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fthe-cross-product-lines-and-planes","The Cross Product, Lines, and Planes","The cross product multiplies two vectors into a third perpendicular to both, with length equal to the area of the parallelogram they span. That one construction supplies the direction of a line, the normal of a plane, and, through the scalar triple product, the volume of a parallelepiped. Lines carry a point and a direction vector; planes carry a point and a normal, which fixes the angle between planes and the distance from a point to a plane.\n",{"path":5059,"title":5060,"module":5052,"summary":5061},"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fcylinders-and-quadric-surfaces","Cylinders and Quadric Surfaces","A surface whose equation omits one variable is a cylinder: the graph of a plane curve swept along the missing axis. A second-degree equation in three variables is a quadric, and translation and rotation reduce every one to a short standard list. Traces — the curves cut by planes parallel to the coordinate planes — sort the six quadrics into ellipsoid, the two paraboloids, the cone, and the two hyperboloids.\n",{"path":5063,"title":5064,"module":5052,"summary":5065},"\u002Fcalculus\u002Fvectors-and-space-curves\u002Fvector-functions-and-space-curves","Vector Functions and Space Curves","A vector function assigns a vector to each value of a parameter, and as the parameter runs its tip traces a space curve. Taking limits, derivatives, and integrals component by component carries all of single-variable calculus into three dimensions. The derivative of a vector function is the tangent vector to its curve, and normalizing it gives the unit tangent that points the way along the path.\n",{"path":5067,"title":5068,"module":5052,"summary":5069},"\u002Fcalculus\u002Fvectors-and-space-curves\u002Farc-length-curvature-and-motion","Arc Length, Curvature, and Motion in Space","Integrating the speed of a vector function gives the length of its curve and a natural parameter, arc length, that depends only on the curve's shape. Curvature measures how fast the unit tangent turns, and together with the normal and binormal it builds the moving TNB frame. Reading the same vector function as a trajectory, its first two derivatives are velocity and acceleration, and acceleration splits cleanly into tangential and normal parts.\n",{"path":5071,"title":5072,"module":5073,"summary":5074},"\u002Fcalculus\u002Fpartial-derivatives\u002Ffunctions-of-several-variables","Functions of Several Variables, Limits, and Continuity","Partial Derivatives","A function of several variables assigns one number to each point of a region in the plane or in space. Domain, graph, level curve, and level surface describe it; limits and continuity extend to two variables, where a limit must agree along every path of approach, not just from the left and the right.\n",{"path":5076,"title":5073,"module":5073,"summary":5077},"\u002Fcalculus\u002Fpartial-derivatives\u002Fpartial-derivatives","A partial derivative holds every variable but one fixed and differentiates in the ordinary sense. Geometrically it is the slope of a trace curve cut from the surface by a coordinate plane. The freeze-and-differentiate rule computes the two first partials; the four second partials follow, and the two mixed ones agree under Clairaut's Theorem when they are continuous.\n",{"path":5079,"title":5080,"module":5073,"summary":5081},"\u002Fcalculus\u002Fpartial-derivatives\u002Ftangent-planes-and-the-chain-rule","Tangent Planes, Linear Approximation, and the Chain Rule","Near a point, a smooth surface looks like its tangent plane, and the plane's equation is built from the two partial derivatives. That linearization defines the total differential and the meaning of differentiability in two variables. The chain rule then propagates derivatives through composed functions, tracked by a tree diagram, and yields clean formulas for implicit differentiation.\n",{"path":5083,"title":5084,"module":5073,"summary":5085},"\u002Fcalculus\u002Fpartial-derivatives\u002Fdirectional-derivatives-and-the-gradient","Directional Derivatives and the Gradient","The partial derivatives measure slope along the two axes; the directional derivative measures slope along any chosen direction, and equals the gradient dotted with a unit vector. The gradient points in the direction of steepest increase, its length is the greatest rate, and it stands perpendicular to level curves and surfaces, which fixes the tangent plane to a level surface.\n",{"path":5087,"title":5088,"module":5073,"summary":5089},"\u002Fcalculus\u002Fpartial-derivatives\u002Foptimization-and-lagrange-multipliers","Optimization and Lagrange Multipliers","Extrema of a two-variable function sit at critical points where the gradient vanishes; the Second Derivatives Test sorts them into peaks, valleys, and saddles by the sign of a discriminant. Absolute extrema on a closed region also need the boundary. When the domain is itself a constraint curve, Lagrange multipliers set the two gradients parallel and solve the constrained problem.\n",{"path":5091,"title":5092,"module":5093,"summary":5094},"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fdouble-integrals","Double Integrals","Multiple Integrals and Vector Calculus","The double integral extends the definite integral to functions of two variables: a limit of Riemann sums that measures signed volume under a surface. Fubini's Theorem turns it into two ordinary integrations done one after the other, general regions of type I and type II fix the inner limits, polar coordinates absorb circular symmetry through the factor r, and the same machine computes mass, center of mass, and moments of a lamina.\n",{"path":5096,"title":5097,"module":5093,"summary":5098},"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Ftriple-integrals-and-coordinate-systems","Triple Integrals and Coordinate Systems","The triple integral integrates a function of three variables over a solid, as a limit of Riemann sums evaluated by three nested single integrations. Cylindrical coordinates add the factor r to handle axial symmetry, spherical coordinates add rho-squared sine-phi for radial symmetry, and the general change of variables shows both volume elements are Jacobian determinants of the coordinate map. Surface area for a graph completes the measurement toolkit.\n",{"path":5100,"title":5101,"module":5093,"summary":5102},"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fvector-fields-and-line-integrals","Vector Fields and Line Integrals","A vector field assigns a vector to every point of space; the line integral of a field along a curve accumulates its tangential component, measuring work. Conservative fields are gradients of a potential, and for them the Fundamental Theorem for Line Integrals makes the integral depend only on the endpoints. Path independence, closed-loop integrals of zero, and the component test for a potential are three faces of the same property.\n",{"path":5104,"title":5105,"module":5093,"summary":5106},"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fgreens-theorem-curl-and-divergence","Green's Theorem, Curl, and Divergence","Green's Theorem equates the line integral of a field around a positively oriented closed curve with a double integral over the enclosed region, turning a boundary computation into an area computation and vice versa. Curl measures local circulation and divergence measures local outflow; the two vector forms of Green's Theorem express the boundary integral as the integrated curl or divergence, the planar case of Stokes' and the Divergence Theorem.\n",{"path":5108,"title":5109,"module":5093,"summary":5110},"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fsurface-integrals","Parametric Surfaces and Surface Integrals","A parametric surface is the image of a two-variable vector function; its area element is the magnitude of the cross product of the two tangent vectors. The surface integral of a scalar function sums it over that area, and the flux integral of a vector field sums the field's normal component, measuring flow through the surface. Orientation by a choice of unit normal makes flux well-defined, the integral Stokes' and the Divergence Theorem operate on.\n",{"path":5112,"title":5113,"module":5093,"summary":5114},"\u002Fcalculus\u002Fmultiple-integrals-and-vector-calculus\u002Fstokes-and-the-divergence-theorem","Stokes' Theorem and the Divergence Theorem","Stokes' Theorem lifts Green's Theorem into space: the line integral of a field around the boundary of a surface equals the flux of its curl through the surface. The Divergence Theorem relates the outward flux across a closed surface to the triple integral of divergence over the solid it encloses. Together with the Fundamental Theorem of Calculus and its line-integral and Green counterparts, they are one theorem: the integral of a derivative over a region equals the integral of the field over its oriented boundary.\n",{"path":5116,"title":5117,"module":6,"summary":6},"\u002Fcalculus","Calculus",{"path":5119,"title":5120,"module":3628,"summary":5121},"\u002Fmechanics\u002Ffoundations\u002Fmeasurement-and-dimensions","Measurement and Dimensions","Every physical quantity is a number attached to a unit, and that pairing is what lets you check an equation before computing anything, since terms that add together must carry the same dimensions. We build the SI base units and the notion of dimension, then use dimensional analysis to test a proposed relation and form scaling groups — a method that fixes a formula's shape but never its numerical constants. The lesson also sets how precisely a result may be stated, through significant figures, propagated uncertainty, and order-of-magnitude checks that catch errors a raw calculator answer hides.\n",{"path":5123,"title":5124,"module":3628,"summary":5125},"\u002Fmechanics\u002Ffoundations\u002Fvector-algebra","Vector Algebra","Force, velocity, and displacement all carry a direction, so mechanics needs an arithmetic that respects it; adding magnitudes alone gives the wrong answer the moment two arrows point different ways. We set up vectors and their components in a chosen basis, then build the two products that carry most of the physics — the dot product, which extracts the part of one vector along another and yields work and power, and the cross product, which measures oriented area and yields torque and angular momentum. Rotating the axes changes the components while leaving the vector itself untouched, and the same component method resolves a force along whatever directions a constraint picks out.\n",{"path":5127,"title":5128,"module":5129,"summary":5130},"\u002Fmechanics\u002Fkinematics\u002Fone-dimensional-motion","One-Dimensional Motion","Kinematics","Motion along a line already forces the two questions the whole of kinematics repeats: how fast is the object moving now, and where will it be next? Velocity and acceleration answer the first as derivatives of position; integrating them back — the signed area under a graph — answers the second. We derive the constant-acceleration equations, mark exactly where the \"constant\" assumption is load-bearing, and see why sign, not magnitude, is what carries direction.\n",{"path":5132,"title":5133,"module":5129,"summary":5134},"\u002Fmechanics\u002Fkinematics\u002Fmotion-graphs","Motion Graphs","Draw a motion as a graph and its two most useful facts turn geometric: the slope of the position curve is the velocity, and the area under the velocity curve is the displacement. We read motion in both directions — differentiating a graph for the next rate, integrating it back to recover position — and handle the curved, piecewise, and noisy graphs that real measurements produce. Along the way we see why a velocity estimated from two positions belongs to the midpoint of their interval, not its end.\n",{"path":5136,"title":5137,"module":5129,"summary":5138},"\u002Fmechanics\u002Fkinematics\u002Fprojectile-motion","Projectile Motion","Throw an object and it seems to trace one curved path, but the motion is really two independent one-dimensional motions running at once: constant velocity across the ground and free fall in the vertical. Splitting it that way turns every projectile question — how long it stays up, how far it lands, how high it climbs, whether it clears an obstacle — into a pair of equations you already know. We derive the parabolic trajectory, work both the forward and the inverse problems, and show why the familiar $45^\\circ$ range-maximizing angle holds only when launch and landing heights match.\n",{"path":5140,"title":5141,"module":5129,"summary":5142},"\u002Fmechanics\u002Fkinematics\u002Frelative-motion","Relative Motion","A velocity is only ever measured relative to some observer, so a boat's speed through the water, over the ground, and as seen from another boat are three different vectors. Choosing the right frame — and subtracting one motion from another — collapses river crossings, crosswind headings, pursuit, and closest-approach problems into a single vector equation. We build the relative-velocity and relative-position relations for uniformly moving frames, show why acceleration is the one quantity all such observers agree on, and note where rotating frames break the simple subtraction.\n",{"path":5144,"title":5145,"module":5129,"summary":5146},"\u002Fmechanics\u002Fkinematics\u002Fcircular-motion","Circular Motion","An object going around a circle at a steady speed is still accelerating, because its velocity is forever changing direction — the fact that governs everything from a car on a curve to a satellite in orbit. We tie the angular description (angle, angular velocity, angular acceleration) to the linear one through $v=r\\omega$, split the acceleration into an inward part that turns the velocity and a tangential part that changes its speed, and extend the inward $v^2\u002Fr$ result to any curved path through its local radius of curvature. Constant angular acceleration then mirrors straight-line motion equation for equation.\n",{"path":5148,"title":5149,"module":5150,"summary":5151},"\u002Fmechanics\u002Fdynamics\u002Fnewtons-laws","Newton's Laws","Dynamics","What makes a body change its motion, and in which frames does the answer take its simplest form? Newton's three laws settle both: inertial frames are the ones where a force-free body coasts, force is whatever changes momentum, and every interaction pushes back on its source. We write the second law as $\\sum\\vec F=\\d\\vec p\u002F\\d t$, reduce it to $m\\vec a$ at constant mass, and separate what a scale actually reads — the support force — from the weight $m\\vec g$ it is so often mistaken for.\n",{"path":5153,"title":5154,"module":5150,"summary":5155},"\u002Fmechanics\u002Fdynamics\u002Ffree-body-diagrams","Free-Body Diagrams","Once several forces act on a body at once, the reliable way to predict its motion is to isolate that one body and draw every external push and pull on it — nothing more, nothing less. The free-body diagram is that discipline. We fix a system boundary, resolve $\\sum\\vec F=m\\vec a$ into components along axes chosen to fit the geometry, and solve for the unknowns a problem hands us — normal forces, tensions, friction, and the acceleration a constraint permits — seeing why internal forces drop out only when the boundary encloses both bodies that share them.\n",{"path":5157,"title":5158,"module":5150,"summary":5159},"\u002Fmechanics\u002Fdynamics\u002Ffriction-and-curved-motion","Friction and Curved Motion","Real surfaces grip before they slip, fluids push back harder the faster you move through them, and anything rounding a bend must be pulled toward the inside of the curve by something. This lesson supplies the force laws for those three cases. We bound static friction by $|f_s|\\leq\\mu_sN$ and switch to kinetic friction $\\mu_kN$ once sliding starts, model drag as a speed-dependent resistance that levels off at a terminal speed, and show that circular motion demands an inward net force $mv^2\u002Fr$ furnished by real interactions — friction, a banked normal force, tension — never by an invented outward one.\n",{"path":5161,"title":5162,"module":5150,"summary":5163},"\u002Fmechanics\u002Fdynamics\u002Fnumerical-dynamics","Numerical Dynamics","Most force laws — quadratic drag, coupled oscillators, anything nonlinear — admit no closed-form trajectory, so we advance the motion one small time step at a time and let arithmetic do what algebra cannot. This lesson turns $\\d\\vec y\u002F\\d t=f(t,\\vec y)$ into a marching rule. We derive the Euler, Euler--Cromer, midpoint, and Verlet updates, weigh their accuracy and stability, watch a drifting energy expose a bad scheme, and use step-halving and conserved quantities to separate the error of the method from the error of the model.\n",{"path":5165,"title":5166,"module":5150,"summary":5167},"\u002Fmechanics\u002Fdynamics\u002Fcenter-of-mass-systems","Center-of-Mass Systems","A firework bursts into a dozen fragments, yet one point keeps gliding along the original parabola as though nothing had happened. That point is the centre of mass, and following it collapses a many-body tangle into a single equation of motion. We define $\\vec R=\\frac1M\\sum_i m_i\\vec r_i$ and its continuous form, show that internal forces cancel so that only external ones move it, $M\\vec A_{\\rm cm}=\\sum\\vec F_{\\rm ext}$, and put the result to work on recoil, collisions viewed from the centre-of-mass frame, and rocket propulsion, where mass leaving the boundary carries momentum with it.\n",{"path":5169,"title":5170,"module":5171,"summary":5172},"\u002Fmechanics\u002Fenergy\u002Fwork-and-kinetic-energy","Work and Kinetic Energy","Energy","A constant push along a straight path is trivial to score, but real forces vary and bend along curved trajectories, and only the component along the motion transfers any energy. Work captures exactly that transfer as the line integral $W=\\int\\vec F\\cdot\\d\\vec r$, and the work-kinetic-energy theorem turns it into a statement about speed: the net work on a particle equals the change in its $\\tfrac12 mv^2$. We build work up from the dot product to the signed area under a force curve, derive the theorem from Newton's second law, and read power as its instantaneous rate $P=\\vec F\\cdot\\vec v$.\n",{"path":5174,"title":5175,"module":5171,"summary":5176},"\u002Fmechanics\u002Fenergy\u002Fpotential-energy","Potential Energy","When a force does the same work no matter which path a particle takes, that work can be stored as a function of position alone, and solving for the motion becomes bookkeeping instead of integration. We single out the forces that qualify — the conservative ones, for which $\\oint\\vec F\\cdot\\d\\vec r=0$ — define their potential energy through $\\vec F=-\\nabla U$, and use conservation of mechanical energy to read speeds, turning points, and equilibria straight off a potential curve. Friction breaks the shortcut, so we also track where mechanical energy leaks away as heat.\n",{"path":5178,"title":5179,"module":5171,"summary":5180},"\u002Fmechanics\u002Fenergy\u002Fmultiparticle-work","Multiparticle Work","A single particle has one velocity and one kinetic energy; a system of many can spin, deform, explode, and warm up while its centre of mass glides along as if nothing happened. Splitting the motion into a centre-of-mass part and an internal part separates the energy that momentum already fixes from the energy left free for relative motion, $K=\\tfrac12MV_{\\rm cm}^2+K'$. We derive the centre-of-mass work theorem, see why an explosion or a released spring can raise total kinetic energy with no external work at all, and use the reduced-mass and centre-of-mass frames to make collisions and internal transfers clean.\n",{"path":5182,"title":5183,"module":5171,"summary":5184},"\u002Fmechanics\u002Fenergy\u002Fmass-energy-and-binding","Mass-Energy and Binding","Relativity puts rest itself on the energy ledger: a mass $m$ carries energy $mc^2$ even when it sits still, so weighing a system's separated pieces and weighing the assembled whole give different answers, and the gap is binding energy. We convert freely between mass units and MeV, compute the energy that holds a nucleus together, and read the binding-energy-per-nucleon curve that explains why fusing light nuclei and splitting heavy ones both release energy. Reaction $Q$ values, thresholds, and recoil then follow from the same mass-difference accounting, once the frame and mass convention are fixed.\n",{"path":5186,"title":5187,"module":5171,"summary":5188},"\u002Fmechanics\u002Fenergy\u002Fphotons-and-quantization","Photons and Quantization","Light delivers its energy in indivisible lumps: a photon of frequency $f$ carries exactly $hf$, and this one fact explains why a dim blue lamp ejects electrons that an intense red one cannot. We fix a photon's energy and momentum from its wavelength, follow the quanta through emission, absorption, and the photoelectric threshold $K_{\\rm max}=hf-\\phi$, and watch energy and momentum conservation together produce the Compton wavelength shift when a photon scatters from an electron. The recurring discipline is unit and frame care, where a stray factor of $10^9$ or a forgotten rest energy quietly ruins an answer.\n",{"path":5190,"title":5191,"module":5192,"summary":5193},"\u002Fmechanics\u002Fmomentum\u002Fmomentum-and-collisions","Momentum and Collisions","Momentum","When two objects collide, the forces between them are too brief and too tangled to integrate directly, yet the result is fixed by one conserved quantity. Linear momentum $\\vec p=m\\vec v$ turns Newton's second law into the impulse-momentum theorem $\\vec J=\\Delta\\vec p$, and for an isolated system into a conservation law that holds through any internal collision, however dissipative. We use it to separate elastic from inelastic collisions, follow the centre of mass, and read impulse as the signed area under a force-time curve — always tracking which external impulses the chosen system and interval let us drop.\n",{"path":5195,"title":5196,"module":5192,"summary":5197},"\u002Fmechanics\u002Fmomentum\u002Fcenter-of-mass-collisions","Center-of-Mass Collisions","A two-body collision that looks asymmetric in the laboratory becomes almost trivial in the frame that rides along with the centre of mass, where the total momentum is zero and the two momenta stay equal and opposite. We build that frame, reduce the pair to a single relative coordinate carrying the reduced mass $\\mu$, and show that an elastic collision there only rotates one momentum vector while its length holds fixed. Transforming back to the laboratory then handles elastic and inelastic collisions, scattering angles, and reaction thresholds with the same construction — and shows why relative speed, not laboratory kinetic energy, measures what a collision can convert.\n",{"path":5199,"title":5200,"module":5192,"summary":5201},"\u002Fmechanics\u002Fmomentum\u002Frocket-propulsion","Rocket Propulsion","A rocket speeds up by throwing mass backward, so its own mass drops as it flies and $\\vec F=m\\vec a$ no longer applies to a fixed body. Tracking the momentum the exhaust carries across the vehicle boundary gives thrust $T=Ru_e$ and, for a force-free burn, the rocket equation $\\Delta v=u_e\\ln(m_i\u002Fm_f)$ — a logarithm that makes large velocity changes expensive in propellant and forces staging. We then add the forces a real ascent cannot ignore, gravity, drag, and steering, and show how thrust and mass-flow records are cross-checked to infer the exhaust speed.\n",{"path":5203,"title":5204,"module":5205,"summary":5206},"\u002Fmechanics\u002Frotation\u002Frotational-inertia","Rotational Inertia","Rotation","Push a wheel and a merry-go-round with the same force and they speed up at wildly different rates: the same mass resists rotation differently depending on where it sits relative to the axis. That single fact is the moment of inertia, $I=\\int r_\\perp^2\\,\\d m$, and this lesson builds it from the ground up. We tie angular motion to linear through $s=r\\theta$, $v=r\\omega$, and $a_t=r\\alpha$, derive $I$ for rods, disks, and spheres, and use the parallel- and perpendicular-axis theorems to move between axes — always naming the axis, because the same body has as many moments of inertia as it has lines to spin about.\n",{"path":5208,"title":5209,"module":5205,"summary":5210},"\u002Fmechanics\u002Frotation\u002Frotational-dynamics","Rotational Dynamics","A force applied to a wheel does nothing unless it acts off the axis: what turns a rigid body is torque, force times lever arm. This lesson makes that precise and turns it into the rotational Newton's second law, $\\sum\\tau=I\\alpha$ about a fixed axis, the exact analogue of $\\sum F=ma$. From there we get rotational work $W=\\int\\tau\\,\\d\\theta$ and power $P=\\tau\\omega$, size a motor to a load, and solve pulleys and Atwood machines where the pulley's own inertia can no longer be ignored — always insisting that every torque be measured about the same axis.\n",{"path":5212,"title":5213,"module":5205,"summary":5214},"\u002Fmechanics\u002Frotation\u002Frolling-motion","Rolling Motion","A rolling wheel is doing two things at once — translating and spinning — but the no-slip condition $v_{cm}=R\\omega$ locks them together, and that single constraint is what makes rolling tractable. We use it to split the kinetic energy into $\\tfrac12Mv_{cm}^2+\\tfrac12I\\omega^2$, find how fast a cylinder reaches the bottom of an incline, and show why the contact point is instantaneously at rest. The static friction that enforces rolling does no work; we track its direction from the tendency to slip, and mark exactly where the model breaks once the required friction exceeds $\\mu_sN$.\n",{"path":5216,"title":5217,"module":5205,"summary":5218},"\u002Fmechanics\u002Frotation\u002Fangular-momentum","Angular Momentum","A skater pulls in her arms and spins faster, with no torque acting: that is angular momentum conservation, and it lets us answer questions that would be hopeless force by force. We build $\\vec L=\\vec r\\times\\vec p$, show it obeys $\\vec\\tau_{ext}=\\d\\vec L\u002F\\d t$, and use its conservation under zero external torque to link before and after in collisions, reconfigurations, and coupled rotors without ever resolving the internal forces. The catch is bookkeeping: the origin, the system boundary, and the frame must be fixed first, and a change in total $\\vec L$ always points to an external impulse someone forgot.\n",{"path":5220,"title":5221,"module":5205,"summary":5222},"\u002Fmechanics\u002Frotation\u002Frolling-resistance","Rolling Resistance","Ideal rolling should coast forever, yet every real wheel slows down. The reason is that a deformable tire and road do not press through a single point: the contact patch spreads, the normal-force resultant shifts ahead of the axle, and that offset is a resisting moment even with no gross sliding. We package it as an equivalent force $F_{rr}=C_{rr}N$, tie the coefficient to load, surface, speed, and temperature, and use coast-down, towing, and traction tests to separate this contact loss from aerodynamic drag, bearing friction, and the adhesion limit where rolling gives way to skidding.\n",{"path":5224,"title":5225,"module":5205,"summary":5226},"\u002Fmechanics\u002Frotation\u002Fgyroscopic-precession","Gyroscopic Precession","A spinning top leans over but does not fall — it swings its axis in a slow horizontal circle instead. The paradox dissolves once torque is read as the rate of change of a vector: gravity's torque is perpendicular to the spin angular momentum, so it turns $\\vec L$ rather than toppling it. We derive the steady precession rate $\\Omega\\simeq Mgr\u002F(I_s\\omega_s)$ in the fast-top limit, state the assumptions it leans on — dominant spin, slow tilt, negligible bearing torque — and read nutation, support motion, and a decaying spin as the ways real gyroscopes depart from it.\n",{"path":5228,"title":5229,"module":5230,"summary":5231},"\u002Fmechanics\u002Fgravity-and-matter\u002Fkeplerian-orbits","Keplerian Orbits","Gravitation and Matter","Why do the planets trace ellipses rather than any other curve? Newton's inverse-square law collapses the two-body problem onto a single conic section, and the answer falls out of two conserved quantities: a central force can exert no torque, so angular momentum is fixed, and gravity is conservative, so energy is fixed. We read an orbit's size and shape straight off those invariants, recover all three of Kepler's laws, and derive escape speed, the vis-viva relation, and the timing of a pass. We also mark where the ideal ellipse breaks down — drag, oblateness, and a third body slowly move a real orbit.\n",{"path":5233,"title":5234,"module":5230,"summary":5235},"\u002Fmechanics\u002Fgravity-and-matter\u002Fgravitational-fields","Gravitational Fields","Instead of tracking the force between every pair of masses, we attach a field to the source and ask a test mass to read it off locally. That move pays off because gravity is conservative: the field is the gradient of a single scalar potential, and potentials from many sources simply add. We build the field-potential picture, use spherical symmetry and the shell theorem to get the point-mass exterior field and the zero interior field of a shell, and read tides straight out of the field's gradient. Along the way we mark exactly when the constant-$g$ and point-mass shortcuts hold and when a shape correction is needed.\n",{"path":5237,"title":5238,"module":5230,"summary":5239},"\u002Fmechanics\u002Fgravity-and-matter\u002Fstatic-equilibrium","Static Equilibrium","What does it take for a loaded structure to stay put? A body at rest needs its forces to cancel and its turning effects to cancel — $\\sum\\vec F=0$ and $\\sum\\vec\\tau=0$ about any point — and almost all of statics is the craft of turning a physical setup into those equations. We build free-body diagrams, replace supports, cables, friction, couples, and distributed loads with their idealized reactions, and locate the centre of gravity that decides whether a body tips. We also count equations against unknowns to separate a determinate problem from one that needs the material's deformation to resolve, and read every negative or inconsistent reaction as a sign that a contact or a boundary was chosen wrong.\n",{"path":5241,"title":5242,"module":5230,"summary":5243},"\u002Fmechanics\u002Fgravity-and-matter\u002Ffluid-statics","Fluid Statics","A fluid at rest cannot support a shear, so the only stress it carries is a pressure that must grow with depth to hold up the fluid above it. That single balance, $\\d p\u002F\\d z=-\\rho g$, runs the whole subject: it sets manometer readings, the force on a dam, and — integrated over a submerged boundary — Archimedes' buoyant force $F_B=\\rho g V_{\\rm disp}$. We derive these, use them to decide when a body floats and whether it floats upright, and mark where acceleration, rotation, compressibility, or capillarity forces a richer pressure model.\n",{"path":5245,"title":5246,"module":5230,"summary":5247},"\u002Fmechanics\u002Fgravity-and-matter\u002Ffluid-flow","Fluid Flow","Two accounting rules carry most of steady flow: mass cannot pile up, so the same volume crosses every section each second, and mechanical energy is conserved along a streamline when the fluid is ideal. From those we get continuity, Bernoulli's relation between pressure, speed, and height, and the results that follow — Torricelli's efflux speed, the Venturi meter, the Pitot tube. We then let go of the ideal assumptions one at a time: viscosity adds wall shear and head loss, Reynolds number decides laminar versus turbulent, and Mach number marks where a gas stops behaving as incompressible.\n",{"path":5249,"title":5250,"module":5230,"summary":5251},"\u002Fmechanics\u002Fgravity-and-matter\u002Forbital-motion","Orbital Motion","A circular orbit is nothing but free fall with enough sideways speed to keep missing the ground, and setting gravity equal to the centripetal requirement fixes that speed and the period once and for all. From the same energy bookkeeping we read off escape speed, sort orbits into bound, parabolic, and hyperbolic by the sign of their specific energy, and see why a tangential burn is the efficient way to change an orbit. We build the Hohmann transfer and its launch window, work the numbers for a geostationary orbit and an escape burn, and mark where finite thrust, perturbations, and an uncertain initial state pull a real trajectory off the ideal.\n",{"path":5253,"title":5254,"module":5230,"summary":5255},"\u002Fmechanics\u002Fgravity-and-matter\u002Fstress-and-elasticity","Stress and Elasticity","Rigid bodies are a fiction; every real material stretches, shears, or squeezes under load, and the useful question is how much. We define stress as force per area and strain as fractional deformation, then find that for small deformations the two are simply proportional — Hooke's law — with Young's, shear, and bulk moduli as the constants for stretch, twist, and volume change. From these we compute extensions, torsional twist, and stored elastic energy, and read a tensile curve for the yield, ultimate, and fracture points where linear elasticity ends. We also mark the practical limits: stress concentrations, fatigue, and the multiaxial states a single uniaxial modulus cannot capture.\n",{"path":5257,"title":5258,"module":5259,"summary":5260},"\u002Fmechanics\u002Foscillations-waves\u002Fdamped-oscillators","Damped Oscillators","Oscillations and Waves","Every real oscillator eventually stops: friction, drag, and internal loss drain its energy, so free motion is a decay rather than a permanent swing. Adding a velocity-proportional resistance to the spring-mass equation produces one dimensionless number, $b\u002F(2\\sqrt{mk})$, that decides whether the mass rings down through many cycles, returns once without overshoot, or crawls back slowly. We solve the three regimes, tie the observed decay to the power balance $b\\dot x^2$, and turn a measured ring-down into the decay rate and quality factor of the apparatus — reading damping off the data instead of assuming it.\n",{"path":5262,"title":5263,"module":5259,"summary":5264},"\u002Fmechanics\u002Foscillations-waves\u002Ftravelling-waves","Travelling Waves","A wave carries a shape, not the material: each element of a rope or air column oscillates in place while the disturbance travels through it. Writing that shape as $f(x\\mp vt)$ turns \"the pattern moves\" into a statement about the cosine's argument, and a local force balance on one string segment fixes the speed at $v=\\sqrt{T\u002F\\mu}$ — restoring stiffness over inertia, with amplitude nowhere in it. We build the sinusoidal wave and its phase, derive the wave equation from Newton's second law, and follow the energy a travelling wave transports, then check speed and power against those predictions.\n",{"path":5266,"title":5267,"module":5259,"summary":5268},"\u002Fmechanics\u002Foscillations-waves\u002Fwave-superposition","Wave Superposition","When two waves cross the same point, what does a probe read? In a linear medium the answer is arithmetic: the displacements add, $y=y_1+y_2$, and the pulses pass through each other unchanged. That one rule produces interference — reinforcement where the signs agree, cancellation where they oppose — and it guards against a common mistake, since displacement can vanish at an instant while the energy sits in transverse motion instead. We work out the signed sum, the phase bookkeeping for equal-frequency components, and why a null in the record is not a null in the wave.\n",{"path":5270,"title":5271,"module":5259,"summary":5272},"\u002Fmechanics\u002Foscillations-waves\u002Fstanding-waves","Standing Waves","Clamp a string at both ends and only certain frequencies survive: the ends must be nodes, and that single geometric demand quantizes the wave into a discrete set of modes $f_n=nv\u002F(2L)$. The travelling wave becomes a fixed pattern of nodes and antinodes — standing, not moving — because equal waves running in opposite directions superpose. We build the standing wave from its counter-propagating pieces, read the harmonic sequence off the boundary conditions (half-wavelengths for a fixed-fixed string, odd quarter-wavelengths for a closed pipe), and test the ideal model against node scans and resonance peaks.\n",{"path":5274,"title":5275,"module":5259,"summary":5276},"\u002Fmechanics\u002Foscillations-waves\u002Fsound-waves","Sound Waves","Sound is a pressure wave so small that a loud tone displaces air molecules by less than the width of an atom, yet a microphone reads it easily — because pressure, not displacement, is what the ear and the instrument sense. The acoustic impedance $Z=\\rho c$ ties pressure, density, and particle velocity together, fixes the intensity a wave carries, and sets the reference for the decibel, a logarithm that tames a $10^{12}$ range in power. We derive the sound speed from the gas's stiffness, convert between pressure and intensity levels, and treat the measurement itself — calibration, geometry, background, averaging — as part of the physics.\n",{"path":5278,"title":5279,"module":5259,"summary":5280},"\u002Fmechanics\u002Foscillations-waves\u002Fdoppler-effect","Doppler Effect","A passing siren drops in pitch not because the source changes but because motion repacks the wavefronts: an approaching source crowds its crests, a receding one stretches them, and a moving listener samples them at a different rate. For mechanical waves every velocity is measured against the medium, and one signed ratio $f_r=f_s(v-u_r)\u002F(v-u_s)$ captures both effects at once. We separate source motion, which sets crest spacing, from receiver motion, which sets arrival rate, invert the shift to recover radial velocity, and mark where the model breaks — supersonic sources, moving air, and reflected paths that carry two shifts, not one.\n",{"path":5282,"title":5283,"module":5259,"summary":5284},"\u002Fmechanics\u002Foscillations-waves\u002Fwave-packets","Wave Packets","No real signal is a single frequency: a disturbance that starts and stops is built from a band of wave numbers, and the width of that band is what makes it local. We ask how such a packet moves — carrier crests at the phase velocity $v_\\mathrm p=\\omega\u002Fk$, the envelope at the group velocity $v_\\mathrm g=\\d\\omega\u002F\\d k$ — and why the two differ once a medium is dispersive. Curvature $\\d^2\\omega\u002F\\d k^2$ spreads and chirps the packet as it travels, and the Fourier reciprocity that ties bandwidth to duration explains why a finite record, aliasing, or a coarse probe can imitate that spreading unless the sampling limits are respected.\n",{"path":5286,"title":5287,"module":5259,"summary":5288},"\u002Fmechanics\u002Foscillations-waves\u002Fbeats-and-coupling","Beats and Coupling","Add two tones a few hertz apart and the sum swells and fades at their difference frequency — a beat — though neither source is changing. We work out that envelope, then ask the mechanical version of the same question: join two oscillators and a single resonance splits into normal modes, with energy sloshing between the coordinates at their frequency difference. The lesson identifies when a slow amplitude envelope signals genuine coupling rather than two independent sources, drift, or deliberate modulation, reading it from envelope timing, spectral sidebands, and the mode shapes.\n",{"path":5290,"title":5291,"module":5259,"summary":5292},"\u002Fmechanics\u002Foscillations-waves\u002Fsimple-harmonic-motion","Simple Harmonic Motion","Any system pushed back toward equilibrium by a force proportional to its displacement obeys one equation, $\\ddot x+\\omega_0^2x=0$, and so moves sinusoidally at $\\omega_0=\\sqrt{k\u002Fm}$ whatever the amplitude. We derive that motion, follow its energy $E=mv^2\u002F2+kx^2\u002F2$ trading between kinetic and potential form at constant total, and read the elliptical phase-space orbit Hooke's law implies. Period, amplitude, velocity, and acceleration then supply redundant checks: an amplitude-dependent period or a curved force residual is the signature that the linear model has failed, and mass-loading and offset tests separate a calibration error from a real frequency shift.\n",{"path":5294,"title":5295,"module":5259,"summary":5296},"\u002Fmechanics\u002Foscillations-waves\u002Fpendulum-motion","Pendulum Motion","A pendulum keeps time only because, for small swings, gravity supplies a restoring torque proportional to the angle — and $T=2\\pi\\sqrt{L\u002Fg}$ then follows without the mass appearing at all. We derive that result, mark exactly which assumptions carry it (small angle, negligible pivot loss, a rigid support), then relax them: finite amplitude lengthens the period through an elliptic integral, and an extended body replaces $L$ with the ratio of its moment of inertia to its center-of-mass distance. How the period drifts with amplitude or pivot position is what diagnoses the geometric, damping, and distributed-mass corrections.\n",{"path":5298,"title":5299,"module":5259,"summary":5300},"\u002Fmechanics\u002Foscillations-waves\u002Fdriven-oscillators","Driven Oscillators","Drive a damped oscillator at a frequency you control and it eventually forgets its own: $m\\ddot x+b\\dot x+kx=F_0\\cos\\omega t$ settles into a steady response whose amplitude and phase depend sharply on how close the drive sits to resonance. We solve for that response, show how damping alone fixes the resonance width, the peak power, and the settling time, and treat base excitation as the same problem with a different input. The steady-state formulas hold only for constant $m$, $b$, and $k$; level-dependent peaks or hysteresis between up- and down-sweeps are how nonlinearity or an extra mode announces itself.\n",{"path":5302,"title":5303,"module":5259,"summary":5304},"\u002Fmechanics\u002Foscillations-waves\u002Fwave-boundaries","Wave Boundaries","A pulse traveling along a string does something abrupt where the string's properties change: part reflects, part transmits, and which is which is set by the impedance mismatch alone. We impose continuity of displacement and transverse force at the join to get the reflection and transmission coefficients in terms of $Z=\\sqrt{T\\mu}$, fix their signs and the polarity flip, and balance the energy. The clean result assumes linear, nondispersive segments meeting at a localized join; pulse polarity, return timing, and energy ratios are the measurements that expose a real connector's mass, loss, or distributed transition.\n",{"path":5306,"title":5307,"module":5308,"summary":5309},"\u002Fmechanics\u002Fthermodynamics\u002Fkinetic-theory-of-ideal-gases","Kinetic Theory of Ideal Gases","Thermodynamics","A gas has no springs and no gears, yet it pushes on its container with a definite pressure and stores energy in a lawful way. Kinetic theory explains both from the motion of the molecules alone: pressure is the accumulated recoil of countless elastic impacts, and temperature is the average translational kinetic energy each molecule carries. We derive $pV=\\tfrac13Nm\\overline{v^2}$ from momentum transfer, read off $\\overline{K}_{\\rm tr}=\\tfrac32kT$, and use the Maxwell–Boltzmann distribution to separate the most probable, mean, and rms speeds — each the right average for a different question — while marking where the dilute, classical assumptions stop holding.\n",{"path":5311,"title":5312,"module":5308,"summary":5313},"\u002Fmechanics\u002Fthermodynamics\u002Ffirst-law-of-thermodynamics","First Law of Thermodynamics","Heat a gas and it may warm, expand, or both; compress it and the same energy can reappear as a temperature rise. The first law settles the bookkeeping: internal energy is a state property whose change equals the heat added plus the work done on the system, $\\Delta E_{\\rm int}=Q_{\\rm in}+W_{\\rm on}$. We fix a system boundary and one sign convention, compute boundary work as $\\int p\\,\\d V$ along a path, and use calorimetry to measure heat and heat capacities. The recurring point is that heat and work are path-dependent transfers while their sum is not, so an energy ledger closes only once every boundary crossing is named.\n",{"path":5315,"title":5316,"module":5308,"summary":5317},"\u002Fmechanics\u002Fthermodynamics\u002Fentropy-and-the-second-law","Entropy and the Second Law","The first law lets energy flow either way; it never says which way heat actually goes. The second law supplies the missing arrow. Entropy, defined through the reversible transfer $\\d S=\\delta Q_{\\rm rev}\u002FT$, can only increase in an isolated system, and that single inequality fixes the direction of heat flow and caps every engine, refrigerator, and heat pump at its Carnot value. We build entropy ledgers for reservoirs and working substances, separate the entropy carried by heat from the entropy generated by irreversibility, and read the sign of the total as a hard check on any proposed thermal machine.\n",{"path":5319,"title":5320,"module":5308,"summary":5321},"\u002Fmechanics\u002Fthermodynamics\u002Fthermal-processes","Thermal Processes","Heat rarely sits still: it stretches solids, pushes real gases off their ideal isotherms, and leaks across walls by conduction, convection, and radiation. Each behavior becomes a number a designer can use. Thermal expansion sets the gaps in a bridge and the stress in a clamped rod; the van der Waals equation and a phase diagram fix when $pV=nRT$ or a latent-heat term applies; Fourier's law, Newton cooling, and Stefan–Boltzmann radiation give the rate of heat flow. We assemble these into thermal-resistance networks and transient time constants, then mark where contact resistance, phase change, or a hidden thermal bridge breaks the simple model.\n",{"path":5323,"title":5324,"module":5308,"summary":5325},"\u002Fmechanics\u002Fthermodynamics\u002Fphase-changes","Phase Changes","Add heat to ice and its temperature climbs — until it reaches $0\\ ^\\circ\\mathrm C$, where the thermometer stalls while the ice melts. That plateau is the whole subject: at a phase boundary the energy rearranges molecules, $Q=mL$, instead of raising temperature, which resumes only once one phase is gone. We stage a heating path into sensible-heat legs ($Q=mc\\Delta T$) and latent plateaus, use the Clausius–Clapeyron relation to track how a boiling point moves with pressure, and solve calorimetry by testing each coexistence endpoint — so a melt fraction that lands outside $[0,1]$ flags a wrong final-state guess rather than a real state.\n",{"path":5327,"title":5328,"module":5308,"summary":5329},"\u002Fmechanics\u002Fthermodynamics\u002Fthermal-machines","Thermal Machines","An engine, a refrigerator, and a heat pump are one machine read three ways: each shuttles heat between a hot and a cold reservoir while trading work at the boundary, and only the flow you call useful separates them. A heat engine turns part of $Q_h$ into work, $W=Q_h-Q_c$; a refrigerator spends work to pull $Q_c$ from the cold side; a heat pump counts the warm-side delivery instead. We measure each with its own ratio — efficiency or coefficient of performance — bound them all by the Carnot limit that reservoir temperatures alone set, and track how finite temperature differences, throttling, and friction generate entropy and pull real machines below that bound.\n",{"path":5331,"title":5332,"module":6,"summary":6},"\u002Fmechanics","Mechanics & Dynamics",{"path":5334,"title":5335,"module":5336,"summary":5337},"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Fcharge-and-conductors","Charge and Conductors","Electric Fields","Rub two objects together and one pulls electrons from the other; nothing is created, only moved. We define what electric charge is — conserved, additive, and quantized in units of $e$ — and why a conductor's mobile carriers rearrange until its interior field vanishes and its surface sits at one potential. We follow charge through contact, induction, and grounding, treat the field-free cavity that turns a conductor into a shield, and mark where finite conductivity and leakage set the limits of the electrostatic picture.\n",{"path":5339,"title":5340,"module":5336,"summary":5341},"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Fcoulombs-law","Coulomb's Law","Two charges at rest push or pull along the line joining them, and the whole of electrostatics is assembled by adding up such pairs. We measure that force — its inverse-square falloff, its linear dependence on each charge, the sign that says attract or repel — and write it as a vector so direction survives superposition. We work the magnitude and component forms on real numbers, check them against limiting cases and dimensions, and fix the point-charge approximation to source sizes small against every separation.\n",{"path":5343,"title":5344,"module":5336,"summary":5345},"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Felectric-field-and-force","Electric Field and Force","Rather than ask how one charge reaches across empty space to another, we credit the source with a field that fills the space and let a second charge respond to whatever field sits at its own location. Electric field is force per unit positive test charge, $\\vec E=kq\\hat r\u002Fr^2$ for a point source, and source fields add before any receiving charge is placed. We compute those fields and the force $\\vec F=q\\vec E$ they exert, then follow a charge along its parabolic path through a uniform field and into nonuniform fields where the dynamics turn position-dependent.\n",{"path":5347,"title":5348,"module":5336,"summary":5349},"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Felectric-field-maps","Electric Field Maps","A field is a vector at every point of space, and the quickest way to grasp one is to draw it. We build the two standard pictures — continuous field lines tangent to $\\vec E$, and scaled vector arrows — and read direction, magnitude, and the location of nulls straight off them. We fix what a line drawing can and cannot say: density encodes magnitude only under a stated seeding rule, and integral curves never cross at a regular point. From there we work the topology near sources, sinks, and conductor surfaces, and state the step-size and interpolation checks a numerical map must pass.\n",{"path":5351,"title":5352,"module":5336,"summary":5353},"\u002Felectricity-and-magnetism\u002Felectric-fields\u002Felectric-dipoles","Electric Dipoles","Most neutral matter carries no net charge yet still responds to an electric field, because its positive and negative charge sit slightly apart. That separation is a dipole, moment $\\vec p=q\\vec d$ pointing from the negative to the positive charge, and it is the leading term in how any neutral distribution looks from far away. We derive the torque $\\vec p\\times\\vec E$ and energy $-\\vec p\\cdot\\vec E$ a uniform field imposes, the net force a field gradient adds, and the axial and equatorial $1\u002Fr^3$ fields the pair produces, then measure how far out the point-dipole approximation still holds.\n",{"path":5355,"title":5356,"module":5357,"summary":5358},"\u002Felectricity-and-magnetism\u002Fcontinuous-charge-distributions\u002Fcontinuous-charge-fields","Continuous Charge Fields","Continuous Charge Distributions","A charged rod, ring, or disk is not a point, yet its field is still nothing but Coulomb's law added up over the charge it carries. We replace the discrete sum by an integral, with $\\d q=\\lambda\\d\\ell$, $\\sigma\\d A$, or $\\rho\\d V$, so the real work becomes geometry: writing the vector from each source element to the field point, and letting symmetry cancel the components that must cancel before any integral is attempted. We carry the line, ring, and disk fields through in full, then check each result against its near field, its far field, and its dimensions.\n",{"path":5360,"title":5361,"module":5357,"summary":5362},"\u002Felectricity-and-magnetism\u002Fcontinuous-charge-distributions\u002Fgauss-law-and-conductors","Gauss's Law and Conductors","Adding up Coulomb's law over a whole distribution is laborious; Gauss's law trades that sum for a single statement, that the flux of $\\vec E$ out of any closed surface counts the charge inside, $\\oint\\vec E\\cdot\\d\\vec A=Q_{\\rm enc}\u002F\\varepsilon_0$. The law is always true, but it hands over the field only when the source is symmetric enough to pull $E$ outside the integral. We apply it to spheres, lines, and sheets, then turn it on conductors, where the zero interior field drives every excess charge to the surface and fixes the normal-field jump $\\sigma\u002F\\varepsilon_0$, the charge induced on a cavity wall, and electrostatic shielding.\n",{"path":5364,"title":5365,"module":5366,"summary":5367},"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Fpoint-charge-potential","Point-Charge Potential","Electric Potential","The electrostatic force is conservative, so the work it does between two points\ndepends only on the endpoints. That lets us trade the vector field for a single\nscalar attached to each point, the electric potential, the potential energy a unit\ncharge would have there. We build potential from the work integral, fix the usual\nreference at infinity, and add point sources as scalars, $V=k\\sum_i q_i\u002Fr_i$,\navoiding the vector bookkeeping the field demands. Signed charges, the reference\nchoice, equipotential motion, and far-field expansions each give an independent\ncheck on a result.\n",{"path":5369,"title":5370,"module":5366,"summary":5371},"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Fpotential-gradients-and-equipotentials","Potential Gradients and Equipotentials","Given the potential everywhere, how do we recover the field? The field is the\nnegative gradient, $\\vec E=-\\nabla V$: it points down the steepest local drop in\npotential, and its magnitude is set by how fast $V$ changes, not by the shape of a\ncontour. We read off components with directional derivatives, reconstruct fields\nfrom measured potential grids using centered differences, and use closed-loop\nintegrals and grid refinement to test whether a reconstructed field is physically\nconsistent.\n",{"path":5373,"title":5374,"module":5366,"summary":5375},"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Felectrostatic-energy-and-pressure","Electrostatic Energy and Pressure","Assembling a charge configuration takes work, and that work is stored, but where\nis it kept and how much is there? We total it two ways: as a sum over the charges,\n$U=\\tfrac12\\sum_i q_iV_i$, and as an integral over the field itself,\n$u_E=\\tfrac12\\varepsilon_0E^2$, energy the field carries in every region it fills.\nDifferentiating the stored energy at fixed charge or at fixed voltage recovers the\nmechanical force on a conductor, and at a charged surface the same field scale\nappears as an outward electrostatic pressure. We work the parallel-plate case in\nfull and mark where curvature and fringing make the pressure nonuniform.\n",{"path":5377,"title":5378,"module":5366,"summary":5379},"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Flaplace-boundary-problems","Laplace Boundary Problems","Often the charges are not given, only the conductors and the voltages held on\nthem, and the potential in the empty space between has to be found. There $V$ obeys\nLaplace's equation $\\nabla^2V=0$, and the boundary data alone determine a unique solution.\nWe solve it two ways: separation of variables into boundary-matched modes, whose\nhigher spatial frequencies die away with depth into the domain, and finite-difference\nrelaxation for boundaries no analytic mode fits. Residual norms, boundary error, and\nflux balance tell us when the computed potential and its field can be trusted.\n",{"path":5381,"title":5382,"module":5366,"summary":5383},"\u002Felectricity-and-magnetism\u002Felectric-potential\u002Fcontinuous-charge-potentials","Continuous Charge Potentials","When charge is spread over a line, a surface, or a volume, the sum over point\nsources becomes an integral, $V(\\vec r)=k\\int \\d q\u002F|\\vec r-\\vec r'|$. Because\npotential is a scalar, this integral sidesteps the component algebra the field\nwould force, until the field is actually wanted through $\\vec E=-\\nabla V$. We set\nup the right density element for each geometry, choose a workable reference, handle\nthe integrable singularities that arise when the observation point sits on the\ncharge, and check every result against symmetry, dimensions, and the far-field\nmultipole limit.\n",{"path":5385,"title":5386,"module":5387,"summary":5388},"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fcapacitance-fundamentals","Capacitance Fundamentals","Capacitance","How much charge must you separate onto two conductors to hold a given voltage between\nthem? That ratio, $C=Q\u002F\\Delta V$, is fixed by the conductor geometry and the medium,\nnot by how much charge is presently stored. We compute it from the field for the\nparallel-plate, isolated-sphere, concentric-sphere, and coaxial geometries, trace how\nsurface charge and boundary conditions set each result, and see where fringing,\nguarding, and stray coupling separate the ideal formula from what a bridge measures.\n",{"path":5390,"title":5391,"module":5387,"summary":5392},"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fcapacitor-networks","Capacitor Networks","Wire several capacitors together and the source sees one equivalent capacitance — but\nwhich? The answer comes not from how the symbols are drawn but from which conductors\nshare a node: parallel branches hold a common voltage and add, $C_{\\rm eq}=\\sum_iC_i$,\nwhile series branches share a common charge and add reciprocally. We derive both rules\nfrom charge conservation on the floating internal node, then extend the node-charge\nmethod to unequal, precharged, and stray-coupled branches and carry a worked reduction\nthrough to the charge and voltage on every element.\n",{"path":5394,"title":5395,"module":5387,"summary":5396},"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fcapacitor-energy-and-force","Capacitor Energy and Force","Charging a capacitor takes work, because every increment of charge is pushed through\nthe voltage the earlier charge already established. We total that work three\nequivalent ways, $U=Q^2\u002F(2C)=Q\\Delta V\u002F2=C(\\Delta V)^2\u002F2$, locate it in the field as\na density $u=\\tfrac12\\epsilon_0E^2$, then let the plates move. Differentiating the\nstored energy at fixed charge, or the coenergy at fixed voltage, gives the mechanical\nforce; the two boundaries differ only by the work the source supplies. We work the\nparallel-plate attraction and its electrostatic pressure in full, and follow the same\ngradient into pull-in, tilt, comb drives, and traceable force calibration.\n",{"path":5398,"title":5399,"module":5387,"summary":5400},"\u002Felectricity-and-magnetism\u002Fcapacitance\u002Fdielectric-polarization-and-breakdown","Dielectric Polarization and Breakdown","Slide a dielectric between the plates and the capacitance rises — but why, and how\nhard can you drive it before the insulator fails? Bound charge answers the first:\npolarization $\\vec P$ sets up surface and volume charge that partly cancels the\napplied field, so $\\vec D=\\varepsilon_0\\vec E+\\vec P$ separates what the circuit\ncontrols from what the material contributes. We follow the field across layered\ndielectrics and interfaces, tie permittivity and loss to their frequency dependence,\nand treat dielectric strength as a measured, geometry-dependent limit rather than one\nmaterial number.\n",{"path":5402,"title":5403,"module":5404,"summary":5405},"\u002Felectricity-and-magnetism\u002Fdirect-current-circuits\u002Fcurrent-and-resistance","Current and Resistance","Direct-Current Circuits","What does it mean, physically, for charge to flow, and what sets how hard a wire resists that flow? Current counts charge crossing a surface, $I=\\int\\vec J\\cdot\\d\\vec A$, and traces back to a slow drift of many carriers, $\\vec J=nq\\vec v_d$. We establish when the linear law $V=IR$ actually holds, how resistivity and geometry combine into bulk resistance, why real sources sag under load through their internal resistance, and how the three power forms $P=IV=I^2R=V^2\u002FR$ tie electrical work to heating and component ratings.\n",{"path":5407,"title":5408,"module":5404,"summary":5409},"\u002Felectricity-and-magnetism\u002Fdirect-current-circuits\u002Fkirchhoff-network-analysis","Kirchhoff Network Analysis","Once a circuit has more than one loop, no amount of series-parallel folding will reduce it — you need the two conservation laws written as equations. Kirchhoff's junction law is charge conservation at a node; his loop law is energy conservation around a closed path. We turn a labelled network into a linear system in node voltages or mesh currents, fix the sign conventions so a negative answer just means a reversed arrow, and use power balance as an independent check that the algebra describes the circuit that was actually built.\n",{"path":5411,"title":5412,"module":5404,"summary":5413},"\u002Felectricity-and-magnetism\u002Fdirect-current-circuits\u002Frc-transients","RC Transients","How does a circuit get from one steady state to the next when a capacitor refuses to change its voltage all at once? Because a jump would demand infinite current, an RC circuit slides between states exponentially, with a single time constant $\\tau=RC$ that sets the whole schedule: charging fills as $1-e^{-t\u002F\\tau}$, discharge empties as $e^{-t\u002F\\tau}$. We solve the first-order loop equation, read the response off three numbers — the switch-instant voltage, the final dc voltage, and the Thevenin resistance the capacitor sees — and mark where source and probe resistance shift $\\tau$ or where a second storage element hides a mode a one-$\\tau$ fit misses.\n",{"path":5415,"title":5416,"module":5417,"summary":5418},"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmagnetic-trajectories","Magnetic Trajectories","Magnetic Field","A charged particle in a magnetic field never speeds up or slows down, yet its path curves relentlessly. We work out why: the magnetic force is always perpendicular to velocity, so it does no work and bends the transverse motion into a circle of radius $r=mv_\\perp\u002F(|q|B)$ while leaving the parallel motion untouched, producing a helix. We derive the cyclotron frequency, show why it is independent of speed until relativity intervenes, and turn the geometry around: a measured curvature reads back a particle's momentum, which is how tracking detectors weigh what they cannot see.\n",{"path":5420,"title":5421,"module":5417,"summary":5422},"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fhall-effect","Hall Effect","Current tells you charge is moving, but not whether the movers are positive or negative, nor how many there are. A magnetic field settles both questions. Push current through a strip in a transverse field and the carriers pile up on one edge until a transverse electric field just balances the magnetic deflection; the sign of the resulting Hall voltage names the carrier's charge and its size counts the carriers per volume. We derive the balance $q\\vec E+q\\vec v_d\\times\\vec B=0$, read off $V_H=IB\u002F(nqt)$, and see why field-and-current reversal is what separates the real Hall signal from the offsets that mimic it.\n",{"path":5424,"title":5425,"module":5417,"summary":5426},"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmagnetic-force-on-conductors","Magnetic Force on Conductors","A magnet pushes on a current-carrying wire even though the wire is electrically neutral. The reason is that each moving carrier feels the Lorentz force, and those microscopic pushes add up to a force the wire's supports must hold. We sum them into $\\d\\vec F=I\\,\\d\\vec\\ell\\times\\vec B$, collapse it to $\\vec F=I\\vec L\\times\\vec B$ for a straight segment in a uniform field, and see exactly when that shortcut fails and the full path integral is needed. The same law runs backward as a measurement: a force-versus-current slope weighs a magnetic field against a known length.\n",{"path":5428,"title":5429,"module":5417,"summary":5430},"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmagnetic-dipoles","Magnetic Dipoles","A compass needle turns to point north; a current loop in a field does the same thing, and for the same reason. Both are magnetic dipoles, and a uniform field cannot push a dipole anywhere, only twist it. We package a loop's response into one vector, the magnetic moment $\\vec\\mu=IA\\hat n$, from which torque $\\vec\\tau=\\vec\\mu\\times\\vec B$ and orientation energy $U=-\\vec\\mu\\cdot\\vec B$ both follow. Stable alignment sits at the energy minimum, a field gradient is what it takes to produce a net force $\\vec F=\\nabla(\\vec\\mu\\cdot\\vec B)$, and the same moment reappears whenever anything from an electron to a planet acts magnetic.\n",{"path":5432,"title":5433,"module":5417,"summary":5434},"\u002Felectricity-and-magnetism\u002Fmagnetic-field\u002Fmass-spectrometry","Mass Spectrometry","To weigh a single atom you cannot use a scale, so you use a magnetic field instead. A charged ion of unknown mass bends in a field by an amount that depends on its momentum and charge, so if every ion enters with the same velocity, its landing position reads off its mass-to-charge ratio directly. We build the instrument in two stages: crossed electric and magnetic fields that pass only ions with $v=E\u002FB$, and a magnetic sector that bends the survivors along $r=mv\u002F(|q|B)$. Then we ask what blurs a spectral line and how reference ions turn a position into a calibrated mass.\n",{"path":5436,"title":5437,"module":5438,"summary":5439},"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fmoving-charge-fields","Moving-Charge Fields","Magnetic Sources","Every magnetic field comes from charge in motion, and the simplest source is a single point charge drifting past. We work out the field it produces — normal to both the velocity and the line of sight, falling off as the inverse square — and read off why it vanishes straight ahead of the charge and peaks broadside. Summing many such charges is the bridge to steady currents, valid while speeds stay far below $c$ and the motion changes little during the time its field takes to propagate outward.\n",{"path":5441,"title":5442,"module":5438,"summary":5443},"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fbiot-savart-law","Biot–Savart Law","A steady current is a continuous stream of current elements, and the Biot–Savart law hands each one a magnetic contribution — a right-hand cross product that falls off as the inverse square of distance. Summing the contributions along a conductor is a vector line integral, which we carry out for the straight wire to get the endpoint-angle formula. The infinite-wire field $B=\\mu_0 I\u002F2\\pi s$ falls out as the limit where both ends recede, and we mark how fast a finite wire departs from it and when a thin-filament model is safe.\n",{"path":5445,"title":5446,"module":5438,"summary":5447},"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fcircular-current-loops","Circular Current Loops","A ring of current is the simplest source with a well-defined magnetic axis, and it is the building block of every coil and electromagnet. Symmetry kills the transverse Biot–Savart contributions along that axis and leaves a single clean integral; we evaluate it to get $B_z=\\mu_0 I R^2\u002F[2(R^2+z^2)^{3\u002F2}]$, read off the centre field $\\mu_0 I\u002F2R$, and watch it fall into the $1\u002Fz^3$ tail of a magnetic dipole far away. Stacking turns just adds their axial contributions, which is what makes a solenoid out of a pile of loops.\n",{"path":5449,"title":5450,"module":5438,"summary":5451},"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Famperes-law","Ampère’s Law","When a current arrangement is symmetric enough, the Biot–Savart integral is overkill: Ampère's law, $\\oint_C\\vec B\\cdot\\d\\vec\\ell=\\mu_0 I_{\\rm enc}$, gets the field from a single line of reasoning about how much current a loop encloses. We see why the law holds for any steady current, then use cylindrical, planar, and toroidal symmetry to turn the circulation into simple algebra — the field inside and outside a wire, an infinite sheet, a solenoid, and a toroid. We also mark the catch: without symmetry the law still holds but no longer hands you the field pointwise.\n",{"path":5453,"title":5454,"module":5438,"summary":5455},"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fgauss-law-for-magnetism","Gauss’s Law for Magnetism","Electric field lines start and end on charges; magnetic field lines do neither, because no one has ever found an isolated magnetic pole. That single experimental fact is Gauss's law for magnetism: the flux of $\\vec B$ through any closed surface is zero, $\\oint\\vec B\\cdot\\d\\vec A=0$, or in differential form $\\nabla\\cdot\\vec B=0$. We work through what it says — every field line that enters a closed surface must leave it, so field lines close on themselves — and, just as important, what it does not say, since flux through an open surface is generally nonzero.\n",{"path":5457,"title":5458,"module":5438,"summary":5459},"\u002Felectricity-and-magnetism\u002Fmagnetic-sources\u002Fmagnetic-materials","Magnetic Materials","Put matter in a magnetic field and its atoms respond, each acting as a tiny current loop; the aligned moments per unit volume are the magnetization $\\vec M$, whose bound currents add to the field. Separating what we control (the free current) from what the material supplies leads to $\\vec H$ and the relation $\\vec B=\\mu_0(\\vec H+\\vec M)$. We sort materials into diamagnets, paramagnets, and ferromagnets by how $\\vec M$ answers, follow a ferromagnet around its hysteresis loop, and see why the loop's area is the energy dissipated per cycle and why a sample's shape changes the field it actually feels.\n",{"path":5461,"title":5462,"module":5463,"summary":5464},"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fmagnetic-flux","Magnetic Flux","Electromagnetic Induction","A magnetic field threading a loop collapses to one signed number, the flux, and every induced voltage in this module turns out to be a rate of change of that number — so defining the flux and its sign comes first. We define it as the surface integral of $\\vec B$ over an oriented surface, reduce it to $BA\\cos\\theta$ for a uniform field on a flat loop, and carry the flux linkage $N\\Phi_B$ of a coil. The chosen normal fixes the sign; reversing it flips the sign without touching the field. Nonuniform fields and curved surfaces force the integral, so we also build the numerical estimate and the checks that separate a reliable value from a nominal field-times-area product.\n",{"path":5466,"title":5467,"module":5463,"summary":5468},"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Ffaradays-law","Faraday's Law","Move a magnet toward a coil, or ramp the current in a nearby circuit, and a voltage appears with no battery in sight. Faraday's law names the cause: the emf around a loop equals minus the rate of change of the magnetic flux through it, so any change of field, area, orientation, or position that alters the flux drives an emf. We separate the emf, which lives around the boundary whether or not current can flow, from the current that follows only when the path is closed; fix the single sign convention that ties flux to loop orientation; and read the emf off rotating coils and off flux sampled at discrete times.\n",{"path":5470,"title":5471,"module":5463,"summary":5472},"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Flenzs-law","Lenz's Law","The minus sign in Faraday's law is not decoration: it decides which way the induced current flows, and it always chooses the direction that fights the change that produced it. Lenz's law reads that sign off energy conservation — a current that aided the change would be free energy — and turns it into a repeatable procedure. We fix a surface normal and a positive loop direction so the sign is calculable, then work through approaching magnets, expanding loops, coupled coils, and rotating generators, using mechanical work and Joule heating as an independent check on every direction we draw.\n",{"path":5474,"title":5475,"module":5463,"summary":5476},"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fmotional-emf","Motional EMF","Push a wire through a magnetic field and its free charges feel a sideways magnetic force that piles them up at the ends — a battery made of motion. Motional emf is that effect: the work per unit charge a moving conductor supplies is the line integral of $\\vec v\\times\\vec B$ along it, which for a rod moving perpendicular to both its length and the field collapses to $B\\ell v$. We chase where the energy comes from — the hand or motor fighting the magnetic drag, never the magnetic force itself — solve the sliding-rail circuit from both flux and carrier forces, and carry the idea into rotating rods, homopolar disks, generators, and the back emf of a motor.\n",{"path":5478,"title":5479,"module":5463,"summary":5480},"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Feddy-currents","Eddy Currents","A wire carries current along one path; a solid block of metal offers a continuum of them, and any changing flux threading that block sets charge circulating in closed loops it chooses for itself. We ask what those eddy currents do — where they heat, where they drag, and how Lenz's law fixes their direction — and why the same circulation is a feature in an induction furnace and a loss to be suppressed in a transformer core. From a representative-loop estimate we get the scaling (heating grows with the square of frequency and flux rate) and the two design levers, lamination and resistivity, that break the paths a solid conductor would otherwise hand the current.\n",{"path":5482,"title":5483,"module":5463,"summary":5484},"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fself-inductance","Self-Inductance","A coil resists changes to its own current. Drive current through it and the flux it produces threads its own turns; change that current and Faraday's law turns the coil against the source with a back emf $\\mathcal E_L=-L\\,\\d I\u002F\\d t$. We define self-inductance as the flux linkage per ampere fixed by winding and core geometry, derive the long-solenoid value $L=\\mu_0 N^2A\u002F\\ell$, and follow the consequence that dominates circuits: because a finite voltage can only sustain a finite $\\d I\u002F\\d t$, an inductor's current cannot jump — which is why opening a switch on a live coil throws a spark.\n",{"path":5486,"title":5487,"module":5463,"summary":5488},"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Fmagnetic-energy","Magnetic Energy","Building current in a coil means working against its back emf, and that work does not vanish — it sits in the magnetic field as recoverable energy $U_B=\\tfrac12LI^2$, spread through space at density $u_B=B^2\u002F(2\\mu_0)$. We derive both forms, show they agree for a solenoid, and read a force out of the same energy: an armature is pulled toward higher inductance, and $B^2\u002F(2\\mu_0)$ doubles as a magnetic pressure. The lesson closes on the accounting a real switching event demands, where recoverable energy, copper heating, core loss, and clamp dissipation must balance a single ledger.\n",{"path":5490,"title":5491,"module":5463,"summary":5492},"\u002Felectricity-and-magnetism\u002Felectromagnetic-induction\u002Frl-circuits","RL Circuits","Put a resistor and an inductor in series and the current cannot switch on or off at will: it climbs to $V_0\u002FR$ and falls away exponentially on a single time scale $\\tau=L\u002FR$ set by how much flux the coil hoards against how fast the resistor bleeds it. We solve the turn-on and turn-off, then confront the practical sting — because the coil's current refuses to stop instantly, breaking its path throws up a large voltage, which is why real inductive circuits carry freewheel diodes and clamps that trade voltage stress against how quickly the current dies.\n",{"path":5494,"title":5495,"module":5496,"summary":5497},"\u002Felectricity-and-magnetism\u002Falternating-current\u002Fac-fundamentals","AC Fundamentals","Alternating Current","A wall socket delivers a voltage that averages to zero over each cycle, yet it still heats a filament and runs a motor. The resolution is that dissipation follows the mean of the square, not the mean, so we define the root-mean-square value that makes an alternating source the equal of a DC one for resistive heating. We show a sinusoid's RMS is its peak divided by $\\sqrt2$, work out the average power an ideal resistor draws when its current stays in phase with the applied voltage, and separate the peak, average, and RMS descriptions that a single number cannot combine.\n",{"path":5499,"title":5500,"module":5496,"summary":5501},"\u002Felectricity-and-magnetism\u002Falternating-current\u002Freactance","Reactance","A resistor obeys Ohm's law instant by instant, but a capacitor responds to how fast its voltage changes and an inductor to how fast its current changes. Under a steady sinusoid that rate-dependence collapses to a fixed quarter-cycle phase shift and a frequency-dependent amplitude ratio, the reactance. We derive $X_C=1\u002F(\\omega C)$ and $X_L=\\omega L$, adopt phasors to turn the defining derivatives into multiplication by $j\\omega$ so a single complex impedance carries amplitude and phase together, and track the energy an ideal reactance stores and returns without dissipating it. Real windings and dielectrics add loss, leakage, and self-resonance that bound where the ideal formulas hold.\n",{"path":5503,"title":5504,"module":5496,"summary":5505},"\u002Felectricity-and-magnetism\u002Falternating-current\u002Frlc-resonance","RLC Resonance","Put a resistor, inductor, and capacitor in one loop and their reactances work against each other: inductive reactance grows with frequency while capacitive reactance shrinks, and at one frequency they cancel exactly. There the branch looks purely resistive, the current peaks, and the inductor and capacitor voltages can swing far above the source. We locate that resonance at $\\omega_0=1\u002F\\sqrt{LC}$, measure how sharp the peak is with the quality factor $Q=\\omega_0L\u002FR$, tie its half-power bandwidth $R\u002FL$ to the ringdown of the unforced circuit, and read the same poles off as bandpass and peaked filters at the R, L, or C terminals.\n",{"path":5507,"title":5508,"module":5496,"summary":5509},"\u002Felectricity-and-magnetism\u002Falternating-current\u002Fac-power","AC Power","Multiply an AC load's RMS voltage by its RMS current and you get an answer in volt-amperes that the wiring must carry, but not in general the watts the load consumes. The phase between voltage and current splits that product into a part that does net work and a part that merely sloshes energy back and forth. We derive the average power $P=V_{\\rm rms}I_{\\rm rms}\\cos\\phi$, package amplitude and phase into complex power $S=P+jQ$ so that real, reactive, and apparent power form one right triangle, and see why a harmonic-rich current forces the time-domain definition $P=\\langle vi\\rangle$ in place of a single phase angle.\n",{"path":5511,"title":5512,"module":5496,"summary":5513},"\u002Felectricity-and-magnetism\u002Falternating-current\u002Ftransformers","Transformers","Two coils sharing an iron core exchange no charge, yet a changing current in one drives a voltage in the other, and the ratio of their turns sets how voltage and current trade off between the windings. That lets a transformer step a voltage up or down, isolate two circuits, and make a load look larger or smaller to the source by the square of the turns ratio. We build the ideal ratio element from Faraday's law and the dot convention, derive the reflected-impedance rule, then add the winding resistance, leakage, magnetizing current, and core loss that turn the ideal ratios into real regulation, efficiency, and a bounded voltage-frequency range.\n",{"path":5515,"title":5516,"module":5517,"summary":5518},"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Fdisplacement-current","Displacement Current","Maxwell’s Equations and Electromagnetic Waves","Ampère's law asks for the current through a surface bounded by a loop, but a charging capacitor breaks it: slide the surface off the wire and into the gap and the enclosed conduction current drops to zero, while the magnetic field around the loop plainly does not. Maxwell's repair is to count a changing electric flux as itself a source of magnetic circulation. We derive the displacement-current term $\\varepsilon_0\\,\\d\\Phi_E\u002F\\d t$, show that charge continuity demands it, compute the magnetic field it produces inside a charging capacitor, and see how it closes the Ampère–Maxwell law so that electric and magnetic fields can sustain one another as a wave.\n",{"path":5520,"title":5521,"module":5517,"summary":5522},"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Felectromagnetic-waves","Electromagnetic Waves","Once a changing electric flux can drive a magnetic field, the two curl laws feed each other: a disturbance in one regenerates the other, and the pair walks off through empty space with no medium holding it up. We take the curl of Faraday's law, land on a wave equation whose speed is fixed entirely by $\\mu_0$ and $\\varepsilon_0$, and find that $c=1\u002F\\sqrt{\\mu_0\\varepsilon_0}$ falls out of purely electric and magnetic constants. The plane-wave solution then fixes the geometry — $\\vec E$, $\\vec B$, and the propagation direction mutually perpendicular, oscillating in phase, with amplitudes locked at $E=cB$ — a set of independent predictions any real measurement must meet at once.\n",{"path":5524,"title":5525,"module":5517,"summary":5526},"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Felectromagnetic-momentum","Electromagnetic Momentum","A light beam carries no mass, yet it pushes: shine it on a surface and the surface feels a force. We trace that force back to the fields, which store energy with density $\\varepsilon_0E^2$ and carry it along the Poynting vector $\\vec S=\\vec E\\times\\vec B\u002F\\mu_0$. Because that energy also carries momentum $U\u002Fc$, an absorbed beam presses with $I\u002Fc$ and a mirror with $2I\u002Fc$. We derive the Poynting theorem as local energy conservation, tie intensity to field amplitude, and work the momentum balance carefully enough that oblique incidence, partial reflection, and finite beams all drop out of one accounting.\n",{"path":5528,"title":5529,"module":5517,"summary":5530},"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Fdipole-radiation","Dipole Radiation","Only accelerating charge radiates, and the simplest accelerator is a charge sloshing back and forth: an oscillating electric dipole. We work out the field it throws off, keeping the part that survives to large distance — the $1\u002Fr$ radiation field whose intensity goes as $\\sin^2\\theta\u002Fr^2$, zero along the dipole axis and strongest broadside. From it follow the $\\omega^4$ scaling of total radiated power, radiation resistance as the feed's view of that escaping power, and, through reciprocity, the fact that a good transmitter receives well in the same directions. The near-zone terms that fall off faster carry no net power, and we mark carefully where each description is allowed to be used.\n",{"path":5532,"title":5533,"module":5517,"summary":5534},"\u002Felectricity-and-magnetism\u002Fmaxwell-electromagnetic-waves\u002Fpolarization","Polarization","A plane wave still leaves one thing free: which way its electric field points as it oscillates. That freedom is polarization, set entirely by the relative amplitude and phase of the two transverse field components — in phase gives a line, equal amplitudes a quarter cycle apart give a circle, everything else an ellipse. We work out how a linear analyzer reads a state through Malus's law $I=I_0\\cos^2\\theta$, why that scan alone cannot tell circular light from unpolarized, and how a quarter-wave plate plus a few analyzer settings recover the full Stokes vector and the degree of polarization.\n",{"path":5536,"title":5537,"module":5538,"summary":5539},"\u002Felectricity-and-magnetism\u002Foptics\u002Freflection-and-refraction","Reflection and Refraction","Geometrical Optics","Light meeting a boundary between two transparent media splits into a reflected ray and a bent transmitted one, and predicting where those rays go is the whole starting point of geometrical optics. Fixing one convention — every angle measured from the surface normal — we get reflection's equal angles and derive Snell's law $n_1\\sin\\theta_1=n_2\\sin\\theta_2$ from wavefront timing. That single relation, applied once or twice, yields the critical angle and total internal reflection, prism deviation, the lateral shift through a window, apparent depth, and a fiber's acceptance cone; a wavelength-dependent index then adds dispersion. We mark throughout where the ray picture is trustworthy: feature sizes large against the wavelength and clean interface geometry.\n",{"path":5541,"title":5542,"module":5538,"summary":5543},"\u002Felectricity-and-magnetism\u002Foptics\u002Fthin-lenses","Thin Lenses","A lens gathers the light spreading from one point back onto another, and a single paraxial relation $1\u002Fs+1\u002Fs'=1\u002Ff$ predicts where that image lands and how large it is. We collapse two refractions into one bending plane, read image position and orientation off the three principal rays, and trace focal length back to glass and curvature through the lensmaker equation. Sign conventions carry the physics here — they separate real from virtual images and upright from inverted — so we drill them before chaining lenses in sequence and in contact. The lesson ends on how focal length is actually measured on a bench, and where finite thickness, aperture, and dispersion break the thin-lens picture.\n",{"path":5545,"title":5546,"module":5538,"summary":5547},"\u002Felectricity-and-magnetism\u002Foptics\u002Fspherical-mirrors","Spherical Mirrors","Curve a mirror and it stops merely reflecting an image and starts forming one: the same $1\u002Fs+1\u002Fs'=1\u002Ff$ that governs lenses reappears, now with $f=R\u002F2$ and reflected rays and object sharing one side of the glass. We derive the mirror equation from the reflection geometry of a single paraxial ray, then let signed distances do the sorting — real inverted images on the near branch, virtual upright ones behind the surface — and check the concave, convex, and plane-mirror limits against each other. The second half turns to how focal length is actually measured on a bench, by finite conjugates, distant targets, return imaging, and sagitta, and to the aperture and off-axis aberrations the single paraxial focus cannot capture.\n",{"path":5549,"title":5550,"module":6,"summary":6},"\u002Felectricity-and-magnetism","Electricity & Magnetism",{"path":5552,"title":5553,"module":5554,"summary":5555},"\u002Flinear-algebra\u002Flinear-systems\u002Fsystems-and-echelon-forms","Systems of Linear Equations and Row Reduction","Linear Equations in Linear Algebra","A linear system is a finite set of linear equations in shared variables. Elementary row operations rewrite it without changing its solution set, and reducing the augmented matrix to echelon form decides both existence and uniqueness. Pivot positions say whether the solution set is empty, a single point, or infinite.\n",{"path":5557,"title":5558,"module":5554,"summary":5559},"\u002Flinear-algebra\u002Flinear-systems\u002Fvector-and-matrix-equations","Vector Equations and the Matrix Equation Ax = b","The same linear system reads three equivalent ways: a system of equations, a vector equation asking whether b is a linear combination of fixed vectors, and a matrix equation Ax = b. Ax is the linear combination of A's columns weighted by x, so consistency for a given b means b lies in the span of the columns, and consistency for every b means the columns span all of R^m.\n",{"path":5561,"title":5562,"module":5554,"summary":5563},"\u002Flinear-algebra\u002Flinear-systems\u002Fsolution-sets-and-applications","Solution Sets and Applied Linear Systems","A homogeneous system Ax = 0 has a solution set that is a span through the origin; a consistent Ax = b has that same span translated by any one particular solution. Parametric vector form writes both explicitly. The structure shows up in applied systems with many solutions: equilibrium prices, balanced chemical reactions, network flows, weight-loss diets, and migration models.\n",{"path":5565,"title":5566,"module":5554,"summary":5567},"\u002Flinear-algebra\u002Flinear-systems\u002Flinear-independence","Linear Independence","A set of vectors is linearly independent when the only linear combination equal to zero is the trivial one; otherwise a dependence relation writes one vector in terms of the others. For the columns of A the question becomes whether Ax = 0 has only the trivial solution — a pivot in every column. Counting pivots settles independence, and any set with more vectors than entries is automatically dependent.\n",{"path":5569,"title":5570,"module":5554,"summary":5571},"\u002Flinear-algebra\u002Flinear-systems\u002Flinear-transformations","Linear Transformations and Their Matrices","Reading A as an action rather than an array, x maps to Ax is a transformation from R^n to R^m. The ones that preserve addition and scalar multiplication are the linear transformations, and every one is x maps to Ax for a unique standard matrix whose columns are the images of the standard basis vectors. Onto and one-to-one translate into the span and independence of those columns.\n",{"path":5573,"title":5574,"module":5575,"summary":5576},"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fmatrix-operations","Matrix Operations","Matrix Algebra","Matrices add and scale entrywise, but their product is defined so that multiplication corresponds to composition of linear maps: the columns of AB are A applied to the columns of B. From that requirement follow the row-column rule, the algebra of products (associative and distributive but not commutative), powers, and the transpose.\n",{"path":5578,"title":5579,"module":5575,"summary":5580},"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fmatrix-inverse-and-invertibility","The Inverse and the Invertible Matrix Theorem","The inverse of a square matrix is the matrix analogue of a reciprocal, defined by AA⁻¹ = I. A closed form settles the 2×2 case; the Gauss–Jordan algorithm row reduces [A | I] to [I | A⁻¹] in general; and elementary matrices record single row operations. The Invertible Matrix Theorem collects a dozen equivalent conditions for invertibility into one statement.\n",{"path":5582,"title":5583,"module":5575,"summary":5584},"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fpartitioned-matrices-and-lu","Block Matrices and the LU Factorization","Partitioning a matrix into blocks lets sums, products, and inverses be computed block by block, as if the submatrices were scalars. Block structure also underlies the LU factorization A = LU, which splits solving Ax = b into two fast triangular solves and repays the cost whenever many systems share one coefficient matrix.\n",{"path":5586,"title":5587,"module":5575,"summary":5588},"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fsubspaces-dimension-rank","Subspaces of Rⁿ, Dimension, and Rank","A subspace is a set closed under addition and scalar multiplication. Every matrix carries two: the column space of all attainable outputs Ax, and the null space of all solutions of Ax = 0. A basis measures each with a minimal spanning set, dimension counts it, and the Rank Theorem ties pivots and free variables together as rank + nullity = n.\n",{"path":5590,"title":5591,"module":5575,"summary":5592},"\u002Flinear-algebra\u002Fmatrix-algebra\u002Fapplications-leontief-and-graphics","Applications: Leontief Economics and Computer Graphics","The Leontief input–output model balances an economy through (I − C)x = d and expands the inverse as a geometric series in the consumption matrix. Computer graphics moves figures with matrix products, using homogeneous coordinates so that translation and perspective projection become matrix multiplications too.\n",{"path":5594,"title":5595,"module":5596,"summary":5597},"\u002Flinear-algebra\u002Fdeterminants\u002Fdeterminants-and-cofactors","Introduction to Determinants","Determinants","The determinant of a square matrix is defined recursively by cofactor expansion: an n-by-n determinant is a signed sum of (n-1)-by-(n-1) determinants built from the first row. The expansion can equally run along any row or down any column, and a triangular matrix has determinant equal to the product of its diagonal.\n",{"path":5599,"title":5600,"module":5596,"summary":5601},"\u002Flinear-algebra\u002Fdeterminants\u002Fproperties-of-determinants","Properties of Determinants","Row operations act on the determinant in three predictable ways, and this turns row reduction into a fast algorithm: the determinant is the product of the pivots times a sign for the interchanges. The same properties yield the invertibility test det A is nonzero, the transpose identity, and the multiplicative law det(AB) equals det A times det B.\n",{"path":5603,"title":5604,"module":5596,"summary":5605},"\u002Flinear-algebra\u002Fdeterminants\u002Fcramer-volume-and-area","Cramer's Rule, Volume, and Linear Transformations","Cramer's rule writes each unknown of an invertible system as a ratio of determinants, and the same idea gives a closed formula for the inverse through the adjugate. Geometrically the absolute determinant is the area of the parallelogram or the volume of the parallelepiped spanned by the columns, so a linear map scales every region's measure by that factor.\n",{"path":5607,"title":5608,"module":5609,"summary":5610},"\u002Flinear-algebra\u002Fvector-spaces\u002Fvector-spaces-and-subspaces","Vector Spaces and Subspaces","Vector Spaces","A vector space is any set closed under addition and scalar multiplication that obeys ten algebraic axioms. The same axioms that govern arrows in the plane govern polynomials, functions, matrices, and infinite signals, so one theory covers them all. A subspace is a subset that is a vector space in its own right, tested by three conditions, and the span of any set of vectors is the smallest subspace containing them.\n",{"path":5612,"title":5613,"module":5609,"summary":5614},"\u002Flinear-algebra\u002Fvector-spaces\u002Fnull-and-column-spaces","Null Spaces, Column Spaces, and Linear Transformations","Two subspaces sit inside every matrix. The null space collects all solutions of $Ax = 0$ and lives in the domain; the column space collects every attainable $Ax$ and lives in the codomain. One is defined implicitly by a condition, the other explicitly by a spanning set, and the same pair appears for an abstract linear transformation as its kernel and range.\n",{"path":5616,"title":5617,"module":5609,"summary":5618},"\u002Flinear-algebra\u002Fvector-spaces\u002Fbases-and-independent-sets","Linearly Independent Sets and Bases","A basis is a spanning set with no redundancy: linearly independent and still large enough to reach every vector. The spanning-set theorem shows any spanning set can be trimmed to a basis by discarding dependent vectors, and the pivot columns of a matrix give a basis for its column space. Independence and spanning are defined for abstract spaces exactly as in $\\mathbb{R}^n$.\n",{"path":5620,"title":5621,"module":5609,"summary":5622},"\u002Flinear-algebra\u002Fvector-spaces\u002Fcoordinate-systems","Coordinate Systems","Fixing a basis assigns every vector a unique list of coordinates, turning an abstract space into $\\mathbb{R}^n$. The coordinate mapping is a one-to-one linear transformation onto $\\mathbb{R}^n$ — an isomorphism — so any $n$-dimensional space is indistinguishable from $\\mathbb{R}^n$ as far as vector-space computations go. In $\\mathbb{R}^n$ the change-of-coordinates matrix $P_B$ and its inverse convert between basis coordinates and standard coordinates.\n",{"path":5624,"title":5625,"module":5609,"summary":5626},"\u002Flinear-algebra\u002Fvector-spaces\u002Fdimension-and-rank","The Dimension of a Vector Space and Rank","Every basis of a space has the same number of vectors, and that number is the dimension. Rank is the dimension of the column space, equal to the dimension of the row space and to the number of pivots. The Rank Theorem, rank plus nullity equals the number of columns, ties the four fundamental subspaces of a matrix together and adds six lines to the Invertible Matrix Theorem.\n",{"path":5628,"title":5629,"module":5609,"summary":5630},"\u002Flinear-algebra\u002Fvector-spaces\u002Fchange-of-basis","Change of Basis","Two bases give the same vector two different coordinate vectors, and a single invertible matrix converts between them. Its columns are the coordinate vectors of the old basis expressed in the new one, and its inverse reverses the conversion. In $\\mathbb{R}^n$ the change-of-coordinates matrix between two bases is found by one row reduction.\n",{"path":5632,"title":5633,"module":5609,"summary":5634},"\u002Flinear-algebra\u002Fvector-spaces\u002Fdifference-equations-and-markov","Applications: Difference Equations and Markov Chains","The solutions of an nth-order linear difference equation form an $n$-dimensional vector space, so finding $n$ independent solutions gives them all. A Markov chain evolves a probability distribution by repeated multiplication by a stochastic matrix, and a regular chain converges to a unique steady-state vector fixed by that matrix. Both applications turn a dynamic process into a subspace or a fixed-point question.\n",{"path":5636,"title":5637,"module":5638,"summary":5639},"\u002Flinear-algebra\u002Feigenvalues\u002Feigenvectors-and-eigenvalues","Eigenvectors and Eigenvalues","Eigenvalues and Eigenvectors","An eigenvector of a square matrix is a nonzero vector the matrix only stretches; its eigenvalue is the stretch factor. The eigenspace of an eigenvalue is the null space of A minus lambda times the identity, the eigenvalues of a triangular matrix are its diagonal entries, and eigenvectors for distinct eigenvalues are linearly independent.\n",{"path":5641,"title":5642,"module":5638,"summary":5643},"\u002Flinear-algebra\u002Feigenvalues\u002Fthe-characteristic-equation","The Characteristic Equation","The eigenvalues of a matrix are the roots of its characteristic polynomial det(A minus lambda I). This degree-n polynomial carries an algebraic multiplicity at each repeated root, a nonzero determinant is equivalent to zero not being an eigenvalue, and similar matrices share a characteristic polynomial and hence the same eigenvalues.\n",{"path":5645,"title":5646,"module":5638,"summary":5647},"\u002Flinear-algebra\u002Feigenvalues\u002Fdiagonalization","Diagonalization","A matrix is diagonalizable when it factors as A equals P D P inverse with D diagonal, which happens exactly when it has n linearly independent eigenvectors. The factorization computes matrix powers cheaply, distinct eigenvalues guarantee it, and a repeated eigenvalue permits it only when its eigenspace dimension equals its multiplicity.\n",{"path":5649,"title":5650,"module":5638,"summary":5651},"\u002Flinear-algebra\u002Feigenvalues\u002Feigenvectors-and-linear-transformations","Eigenvectors and Linear Transformations","Every linear transformation between finite-dimensional spaces has a matrix relative to chosen bases, built from the coordinate vectors of the images of the basis vectors. For a map from a space to itself, an eigenvector basis makes that matrix diagonal, and that change of basis is diagonalization; the matrices similar to A are the representations of the map in every basis.\n",{"path":5653,"title":5654,"module":5638,"summary":5655},"\u002Flinear-algebra\u002Feigenvalues\u002Fcomplex-eigenvalues","Complex Eigenvalues","A real matrix with no real eigenvalues still has complex ones, occurring in conjugate pairs. A real 2-by-2 matrix with eigenvalue a plus b i is similar to a rotation-scaling matrix, whose rotation angle is the argument of the eigenvalue and whose scale factor is its modulus; the modulus decides whether the trajectories close up, spiral in, or spiral out.\n",{"path":5657,"title":5658,"module":5638,"summary":5659},"\u002Flinear-algebra\u002Feigenvalues\u002Fdynamical-systems","Discrete and Continuous Dynamical Systems","Eigenvalues govern the long-term behavior of a system that evolves by x becomes A x or by x prime equals A x. An eigenvector basis decouples both kinds of system into independent scalar equations; the eigenvalues then classify the origin as attractor, repeller, saddle, or spiral, and the dominant eigenpair fixes the growth rate and limiting direction.\n",{"path":5661,"title":5662,"module":5638,"summary":5663},"\u002Flinear-algebra\u002Feigenvalues\u002Fpower-method","Iterative Estimates for Eigenvalues","When only a numerical eigenvalue is needed, iteration is preferred over the characteristic polynomial. The power method repeatedly multiplies by A to converge on the dominant eigenvalue and its eigenvector; the Rayleigh quotient sharpens the estimate for symmetric matrices; and the inverse power method targets any eigenvalue near a known guess.\n",{"path":5665,"title":5666,"module":5667,"summary":5668},"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Finner-product-length-orthogonality","Inner Product, Length, and Orthogonality","Orthogonality and Least Squares","The dot product turns the algebra of vectors in R^n into geometry: length, distance, and perpendicularity. The inner product yields the norm, the Pythagorean theorem, and the orthogonal complement, and the null space of a matrix is the orthogonal complement of its row space.\n",{"path":5670,"title":5671,"module":5667,"summary":5672},"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Forthogonal-sets-and-projections","Orthogonal Sets and Orthogonal Projections","An orthogonal basis makes coordinates trivial: each weight is a single dot product, no linear system required. Orthogonal and orthonormal bases give a direct projection formula onto a line and onto a subspace, the orthogonal decomposition and best-approximation theorems, and the matrix form U U-transpose of a projection.\n",{"path":5674,"title":5675,"module":5667,"summary":5676},"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Fgram-schmidt-and-qr","The Gram-Schmidt Process and QR Factorization","Gram-Schmidt turns any basis into an orthogonal one by repeatedly subtracting off projections onto the span already built. Normalizing the result and recording the coefficients factors the matrix as A = QR, with Q orthonormal and R upper triangular, the factorization behind stable least-squares and eigenvalue algorithms.\n",{"path":5678,"title":5679,"module":5667,"summary":5680},"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Fleast-squares-problems","Least-Squares Problems","When Ax = b has no solution, the least-squares solution makes Ax as close to b as possible. The closest Ax is the projection of b onto the column space, and the vector that produces it solves the normal equations A-transpose A x = A-transpose b. Uniqueness, the residual error, and the stabler QR route follow.\n",{"path":5682,"title":5683,"module":5667,"summary":5684},"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Fleast-squares-applications","Applications to Linear Models","Curve fitting is a least-squares problem in statistical notation. The least-squares line, polynomial fits, and multiple regression all reduce to X beta = y with a design matrix X built from the data, solved by the same normal equations.\n",{"path":5686,"title":5687,"module":5667,"summary":5688},"\u002Flinear-algebra\u002Forthogonality-least-squares\u002Finner-product-spaces","Inner Product Spaces","Promoting the four properties of the dot product to axioms defines an inner product on any vector space, including spaces of functions. Length, distance, orthogonality, Gram-Schmidt, and best approximation all carry over, along with the Cauchy-Schwarz and triangle inequalities and the integral inner product behind Fourier approximation.\n",{"path":5690,"title":5691,"module":5692,"summary":5693},"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fdiagonalizing-symmetric-matrices","Diagonalization of Symmetric Matrices","Symmetric Matrices, Quadratic Forms, and the SVD","A symmetric matrix is one that equals its own transpose. Every such matrix can be diagonalized by an orthogonal change of basis, A = PDPᵀ, with real eigenvalues and perpendicular eigenvectors. This is the Spectral Theorem, and it rewrites A as a weighted sum of rank-one projections onto its eigenvectors.\n",{"path":5695,"title":5696,"module":5692,"summary":5697},"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fquadratic-forms","Quadratic Forms","A quadratic form xᵀAx is the second-degree analogue of a linear map, attached to a symmetric matrix A. Orthogonal diagonalization changes variables to the eigenbasis, removing all cross-terms and rotating the form into standard position. The signs of the eigenvalues then classify it as definite or indefinite.\n",{"path":5699,"title":5700,"module":5692,"summary":5701},"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fconstrained-optimization","Constrained Optimization","Maximizing a quadratic form xᵀAx over the unit sphere has an exact answer: the maximum is the largest eigenvalue of A, attained at its eigenvector, and the minimum is the smallest eigenvalue. Adding orthogonality constraints peels off the eigenvalues in order, characterizing the whole spectrum by optimization.\n",{"path":5703,"title":5704,"module":5692,"summary":5705},"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fsingular-value-decomposition","The Singular Value Decomposition","The singular value decomposition factors any m×n matrix as A = UΣVᵀ, with orthogonal U and V and a nonnegative diagonal Σ of singular values. The singular values are the square roots of the eigenvalues of AᵀA, and they describe the matrix geometrically as a rotation, an axiswise stretch, and another rotation, exposing rank, the four fundamental subspaces, and a best low-rank approximation.\n",{"path":5707,"title":5708,"module":5692,"summary":5709},"\u002Flinear-algebra\u002Fsymmetric-quadratic-svd\u002Fsvd-applications-pca-imaging","Applications: Image Processing and Statistics","Principal component analysis diagonalizes the covariance matrix of a data set, producing uncorrelated variables ordered by variance. The leading components capture most of the variation, which reduces dimension, compresses images through low-rank SVD approximation, and connects directly to the singular values of the data matrix.\n",{"path":5711,"title":5712,"module":5713,"summary":5714},"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fnumerical-thinking-and-matrix-computation","Numerical Thinking and Matrix Computation","Numerical Linear Algebra","Numerical analysis builds efficient discrete algorithms for continuous problems, and its cost is dominated as much by memory traffic as by arithmetic. Block matrix calculus, flop counts, and the BLAS efficiency ratio fix the cost model; triangular and unitary matrices are the two computational building blocks every factorization rests on.\n",{"path":5716,"title":5717,"module":5713,"summary":5718},"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Flu-and-cholesky","LU and Cholesky Factorization in Practice","Gaussian elimination, read as a factorization A = LU, turns a linear system into two triangular solves. A single near-zero pivot wrecks it, so partial pivoting reorders rows to pick the largest available pivot and makes the method work for every invertible matrix. For symmetric positive-definite systems, Cholesky halves the cost and needs no pivoting.\n",{"path":5720,"title":5721,"module":5713,"summary":5722},"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fconditioning-and-floating-point","Conditioning and Floating-Point Arithmetic","A problem's condition number measures how much its answer moves when its data is perturbed, independent of any algorithm. Subtraction is ill-conditioned under cancellation, and for a linear system the amplifier is the matrix condition number κ(A). Floating-point arithmetic supplies the perturbation: every real number is rounded to within a relative machine precision, so even perfect computation inherits an error of order κ times the unit roundoff.\n",{"path":5724,"title":5725,"module":5713,"summary":5726},"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fstability-and-error-analysis","Numerical Stability and Backward Error Analysis","An algorithm is backward stable when its computed answer is the exact answer to a slightly perturbed problem. Combined with the condition number this gives the governing rule of thumb: forward error is at most condition times stability. Three cancellation case studies make the point, then the residual-based backward error applies it to Ax = b and shows why partial pivoting keeps Gaussian elimination stable.\n",{"path":5728,"title":5729,"module":5713,"summary":5730},"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fqr-and-numerical-least-squares","QR, Householder, and Numerical Least Squares","The least-squares problem reduces to the normal equations, but forming AᵀA squares the condition number and can wreck accuracy. The stable route computes a QR factorization directly on A and solves Rx = Qᵀb. Householder reflectors build that QR one column at a time using length-preserving reflections, the unconditionally backward-stable building block behind every serious least-squares solver.\n",{"path":5732,"title":5733,"module":5713,"summary":5734},"\u002Flinear-algebra\u002Fnumerical-linear-algebra\u002Fnumerical-eigenvalues-and-svd","Numerical Eigenvalue Problems and the SVD","Eigenvalues cannot be found by a formula for large matrices, so they are found by iteration. Power and inverse iteration converge to one eigenvector at a rate set by the eigenvalue gap; the QR algorithm sweeps a matrix to Schur form and, with a good shift and a Hessenberg reduction, computes the whole spectrum in cubic time. Singular values follow from the same machinery applied without ever forming AᵀA.\n",{"path":5736,"title":5737,"module":5738,"summary":5739},"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Faffine-combinations","Affine Combinations","Geometry of Vector Spaces","An affine combination is a linear combination whose weights sum to one. The affine hull of a set is the smallest flat containing it: a point, a line, a plane, or a translated subspace. Homogeneous coordinates turn every affine combination into an ordinary linear combination one dimension up.\n",{"path":5741,"title":5742,"module":5738,"summary":5743},"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Faffine-independence-and-barycentric-coordinates","Affine Independence and Barycentric Coordinates","Affine independence is linear independence for the translated or lifted points, and it guarantees each point of an affine hull a unique weight vector. Those weights are barycentric coordinates: centers of mass, ratios of triangle areas, and the interpolation rule behind smooth shading in computer graphics.\n",{"path":5745,"title":5746,"module":5738,"summary":5747},"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Fconvex-combinations-and-convex-sets","Convex Combinations and Convex Sets","A convex combination is an affine combination with nonnegative weights, and the convex hull of a set is the smallest convex set containing it. Convex sets are closed under intersection, and Carathéodory's theorem bounds how many points a convex combination in $\\mathbb{R}^n$ ever needs: at most $n+1$.\n",{"path":5749,"title":5750,"module":5738,"summary":5751},"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Fhyperplanes-and-polytopes","Hyperplanes and Polytopes","A hyperplane is a level set of a linear functional, the set where an inner product equals a constant. Hyperplanes separate disjoint convex sets and support them at their boundaries. Polytopes are convex hulls of finite point sets; their vertices are the extreme points, and a linear functional attains its extremes there.\n",{"path":5753,"title":5754,"module":5738,"summary":5755},"\u002Flinear-algebra\u002Fgeometry-of-vector-spaces\u002Fcurves-and-surfaces","Curves and Surfaces","Bézier curves are affine combinations of control points with polynomial weights, so they lie in the convex hull of those points and bend toward them. The de Casteljau algorithm evaluates them by repeated interpolation, a matrix form factors them for computation, and matching endpoints and tangents joins segments into smooth curves and surfaces.\n",{"path":5757,"title":5758,"module":6,"summary":6},"\u002Flinear-algebra","Linear Algebra",{"path":5760,"title":5761,"module":6,"summary":6},"\u002Ftheory-of-computation","Theory of Computation",{"path":5763,"title":5764,"module":3628,"summary":5765},"\u002Fcomputer-architecture\u002Ffoundations\u002Fbits-bytes-and-words","Bits, Bytes, and Words","Everything a machine stores is a string of bits grouped into bytes. We set out binary and hexadecimal, the byte as the unit of addressing, the word as the machine's natural integer size, and byte ordering — why the same four bytes read as 0x01234567 on one machine and 0x67452301 on another.\n",{"path":5767,"title":5768,"module":3628,"summary":5769},"\u002Fcomputer-architecture\u002Ffoundations\u002Finteger-representation","Integer Representation","A fixed-width byte string is just a pattern; what makes it a number is the rule we read it by. We define unsigned encoding and two's complement — where the top bit carries a negative weight — derive the ranges UMax, TMin, and TMax, and show how the same bits reinterpret between signed and unsigned, how widening sign-extends, and what truncation throws away.\n",{"path":5771,"title":5772,"module":3628,"summary":5773},"\u002Fcomputer-architecture\u002Ffoundations\u002Finteger-arithmetic","Integer Arithmetic","Fixed-width integer arithmetic is arithmetic modulo a power of two: add past the top and the result wraps. We work out unsigned and two's-complement addition and the rules that detect their overflow, why negation is a complement-plus-one, how multiplication truncates to the low-order bits and how compilers turn constant multiplies into shifts and adds, why C declares signed overflow undefined, and the bias fix that keeps shift-based signed division rounding toward zero.\n",{"path":5775,"title":5776,"module":3628,"summary":5777},"\u002Fcomputer-architecture\u002Ffoundations\u002Ffloating-point","Floating Point","IEEE-754 trades the exactness of integers for enormous range by storing numbers as sign, exponent, and fraction — scientific notation in binary. We lay out the single and double formats, the bias that encodes the exponent, the three regimes (normalized, denormalized, special), a worked encode\u002Fdecode, the four rounding modes and round-to-even at the bit level, why addition is not associative, the pitfalls of float-int conversion, and why 0.1 has no exact binary representation.\n",{"path":5779,"title":5780,"module":3628,"summary":5781},"\u002Fcomputer-architecture\u002Ffoundations\u002Fboolean-algebra-and-bit-manipulation","Boolean Algebra and Bit Manipulation","Treat a word as a vector of independent bits and the bitwise operators become an algebra. We define AND, OR, NOT, and XOR as bit vectors, build the masking idioms that set, clear, toggle, and test individual bits, extract fields with zero- and sign-extension, count set bits three ways, derive the classic x & (x - 1) family of tricks, and distinguish bitwise operators from C's short-circuiting logical operators.\n",{"path":5783,"title":5784,"module":5785,"summary":5786},"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fthe-machines-view","The Machine's View","Machine-Level Programming","The instruction set architecture is the contract a compiler writes against: the program counter, sixteen integer registers with their sub-register widths, and the condition codes. We follow one C function down through gcc to assembly, learn to read an instruction as operation plus operands, and fix the vocabulary the rest of the module uses.\n",{"path":5788,"title":5789,"module":5785,"summary":5790},"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fdata-movement","Data Movement","Most instructions a program runs simply move data. We cover the mov family and its size suffixes, the three operand forms, the full memory addressing mode D(Rb,Ri,S) and its special cases, lea for address arithmetic, and how push and pop manipulate the stack pointer %rsp on a stack that grows toward lower addresses.\n",{"path":5792,"title":5793,"module":5785,"summary":5794},"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Farithmetic-and-logic","Arithmetic and Logic","The ALU instructions that compute on register and memory values: add, sub, and imul; the unary inc\u002Fdec\u002Fneg\u002Fnot; the shifts sal\u002Fshr\u002Fsar; the bitwise and\u002For\u002Fxor; and lea reused as a fast arithmetic trick. Each binary operation also sets the condition-code flags CF, ZF, SF, and OF, which cmp and test compute without keeping a result.\n",{"path":5796,"title":5797,"module":5785,"summary":5798},"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fcontrol-flow","Control Flow","How a flat instruction stream realizes branches and loops. The conditional jumps read the condition-code flags; set instructions turn flags into a 0\u002F1 byte. We translate if\u002Felse into the standard compare-and-branch pattern, while\u002Ffor loops into the guarded-do form, and dense switches into jump tables that index a target directly.\n",{"path":5800,"title":5801,"module":5785,"summary":5802},"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fprocedures","Procedures","How a function call works at the machine level: the run-time stack, call and ret passing control through a saved return address, the System V convention that routes the first six arguments through %rdi..%r9 and the result through %rax, the caller-saved versus callee-saved split, the stack frame, and a recursive factorial traced through its frames.\n",{"path":5804,"title":5805,"module":5785,"summary":5806},"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Farrays-structs-and-alignment","Arrays, Structs, and Alignment","How aggregate data lays out in memory. Arrays as base-plus-scaled-index, the row-major ordering of multidimensional arrays, pointer arithmetic in units of the pointed-to type, struct fields at fixed byte offsets, the overlapping storage of unions, and the alignment rules that force padding into a struct.\n",{"path":5808,"title":5809,"module":5785,"summary":5810},"\u002Fcomputer-architecture\u002Fmachine-level-x86-64\u002Fmemory-layout-and-buffer-overflows","Memory Layout and Buffer Overflows","The process address space — text, data, heap, and stack — and the classic vulnerability it enables. A stack buffer that is written past its end can overwrite the saved return address and redirect ret, so we sketch the mechanism defensively and then the three standard protections: stack canaries, a non-executable stack, and address-space layout randomization.\n",{"path":5812,"title":5813,"module":5814,"summary":5815},"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Fwhat-an-isa-is","What an ISA Is","Instruction Set Architecture","The instruction set architecture is the contract that lets a compiler and a chip be written by people who never meet: the stable interface software targets and hardware implements. We separate architecture from microarchitecture, read RISC and CISC as opposite answers to where complexity should live, price out what each choice costs in decode hardware, code density, and pipeline friendliness, and see how x86-64 endures by translating its instructions into RISC-like operations on the fly.\n",{"path":5817,"title":5818,"module":5814,"summary":5819},"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Finstruction-formats-and-operands","Instruction Formats and Operands","An instruction is an opcode plus a way to name its operands. We count operands — 3-address, 2-address, 1-address accumulator, and 0-address stack machines — by writing the same C = A + B four ways, weigh register operands against memory operands, then lay out the same add byte by byte in x86-64 (REX prefix, opcode, ModRM) and in Y86-64, and what fixed versus variable length costs at fetch time.\n",{"path":5821,"title":5822,"module":5814,"summary":5823},"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Faddressing-modes","Addressing Modes","Once an operand field exists, it needs a rule for turning its bits into the data it names. That rule is the addressing mode. We walk the standard set — immediate, register, direct, register-indirect, displacement, scaled-indexed, and PC-relative — fixing the effective-address computation for each, run every mode against one concrete machine state, and price out what Y86-64 loses by keeping only base plus displacement.\n",{"path":5825,"title":5826,"module":5814,"summary":5827},"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Fthe-y86-64-instruction-set","The Y86-64 Instruction Set","Y86-64 is a teaching ISA — a stripped-down x86-64 simple enough to implement by hand yet real enough to compile to. We fix its programmer-visible state (fifteen registers, three condition codes, the PC, memory, and a status code), give the instruction set with exact byte encodings, spell out how the condition codes decide every jXX and cmovXX, and run the encoding both directions: assembly to bytes and raw bytes back to meaning.\n",{"path":5829,"title":5830,"module":5814,"summary":5831},"\u002Fcomputer-architecture\u002Finstruction-set-architecture\u002Fy86-64-programming","Y86-64 Programming","With the encodings fixed, we write real Y86-64 assembly: the .pos, .align, and .quad directives, the calling convention borrowed from x86-64, a stack set up by hand, and complete programs — an array sum and a branch-free max. We watch the assembler turn the listing into the exact byte image the processor will execute, and trace the stack across the call.\n",{"path":5833,"title":5834,"module":5835,"summary":5836},"\u002Fcomputer-architecture\u002Fdigital-logic\u002Ftransistors-gates-and-boolean-functions","Transistors, Gates, and Boolean Functions","Digital Logic","A processor is built from millions of transistor switches. We start at the MOS transistor as a voltage-controlled switch, build the CMOS inverter and NAND transistor by transistor, meet the seven standard gates with their truth tables, show that NAND alone is functionally complete, price each gate in transistors and in time, and turn any truth table into a sum-of-products circuit.\n",{"path":5838,"title":5839,"module":5835,"summary":5840},"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fcombinational-logic-and-hcl","Combinational Logic and HCL","A combinational circuit is a pure Boolean function of its current inputs — no memory, no clock. We draw the line between combinational and sequential logic, do the gate-delay accounting that finds a circuit's critical path and bounds the clock, meet don't-cares, then introduce CS:APP's Hardware Control Language: bit-level operators, word-level signals, equality nets, and the case expression that compiles to a multiplexer tree.\n",{"path":5842,"title":5843,"module":5835,"summary":5844},"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fmultiplexers-decoders-and-the-alu","Multiplexers, Decoders, and the ALU","The combinational building blocks that make a datapath. We build the 2:1 and 4:1 multiplexer and tie it back to HCL's case expression, the n-to-2^n decoder, a one-bit full adder (sum is XOR, carry is majority), the ripple-carry adder that chains them, and finally the ALU — a function unit that selects among add, sub, and, and xor under a control input and exposes condition flags.\n",{"path":5846,"title":5847,"module":5835,"summary":5848},"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fmemory-elements-latches-flip-flops-and-clocking","Memory Elements: Latches, Flip-Flops, and Clocking","A combinational circuit holds no state; feeding a circuit's output back to its input creates memory. We build the SR latch from cross-coupled gates, the level-sensitive D latch, and the master\u002Fslave edge-triggered D flip-flop, then introduce the clock and the synchronous design discipline, the setup\u002Fhold timing window, clock skew, metastability, and the register as n flip-flops sharing one clock.\n",{"path":5850,"title":5851,"module":5835,"summary":5852},"\u002Fcomputer-architecture\u002Fdigital-logic\u002Fregister-files-and-random-access-memory","Register Files and Random-Access Memory","Storage organized for access by address. We build the register file (a small bank of registers with addressed read ports and clocked write ports, the exact structure Y86-64's decode and write-back stages use), then descend to the SRAM and DRAM cells of main memory, why one is fast and dear and the other dense and slow, and how a row decoder picks a word out of a memory array.\n",{"path":5854,"title":5855,"module":5856,"summary":5857},"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fthe-fetch-decode-execute-cycle","The Fetch-Decode-Execute Cycle","Processor Design","A processor is a machine that repeats one loop forever: read the next instruction from memory, figure out what it asks for, do it, and advance. We fix the stored-program idea, lay out the datapath at a high level — PC, instruction memory, register file, ALU, data memory — and the control unit that sequences them, break the work into the six stages the rest of the module builds in hardware, and work out exactly how fetch parses variable-length instructions and computes the next PC.\n",{"path":5859,"title":5860,"module":5856,"summary":5861},"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fthe-seq-stages","The SEQ Stages","The six SEQ stages, made exact. For every Y86-64 instruction — halt, nop, the moves, OPq, the jumps, call and ret, pushq and popq — we write down what Fetch, Decode, Execute, Memory, Write-back, and PC update each compute, as per-instruction stage tables with every row justified. Once the tables are filled in, the processor is fully specified; the remaining lessons turn them into wires.\n",{"path":5863,"title":5864,"module":5856,"summary":5865},"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fcontrol-logic-and-sequencing","Control Logic and Sequencing","The stage tables say what each instruction needs; the control logic computes it from icode. We write the HCL for the register-port selections (srcA, srcB, dstE, dstM), the ALU function and input selection, the memory read\u002Fwrite and address, the branch condition, and the next-PC mux — each a case expression on icode that compiles to a mux — and see how one blob of combinational logic serves every instruction at once. We close by contrasting hardwired control with the microprogrammed alternative.\n",{"path":5867,"title":5868,"module":5856,"summary":5869},"\u002Fcomputer-architecture\u002Fprocessor-design\u002Fassembling-seq","Assembling SEQ","We wire the whole thing together. The functional units from digital logic and the control signals from the last lesson assemble into the complete SEQ datapath, laid out the way CS:APP draws it — six stages stacked bottom to top, Fetch at the floor and PC update at the ceiling, signals flowing up the margins. Then the timing analysis: why everything must settle in one cycle, the no-reading-back principle that makes single-cycle execution consistent, and the critical path that sets the clock. We close by walking an OPq and a ret through the assembled machine.\n",{"path":5871,"title":5872,"module":5856,"summary":5873},"\u002Fcomputer-architecture\u002Fprocessor-design\u002Ftracing-a-program","Tracing a Program","To close the module, we take a complete Y86-64 program — a loop that sums 1 through 3 — and run it through SEQ one cycle at a time, recording the PC, the fetched instruction, every stage computation, and the registers, condition codes, and memory after each cycle. Then we examine single cycles in detail: every named signal of an OPq in concrete hex, and a second program whose call and ret we trace through the stack. The traces confirm that the assembled datapath and control logic behave as a processor.\n",{"path":5875,"title":5876,"module":5877,"summary":5878},"\u002Fcomputer-architecture\u002Fpipelining\u002Fpipelining-principles","Pipelining Principles","Pipelining","A processor that runs one instruction to completion before starting the next wastes most of its hardware most of the time. Pipelining splits the work into stages separated by registers so several instructions are in flight at once. We separate throughput from latency, work the 300 ps example through one, two, and three stages, and derive the three ceilings on the gain: uneven stages, register overhead, and the dependencies between instructions.\n",{"path":5880,"title":5881,"module":5877,"summary":5882},"\u002Fcomputer-architecture\u002Fpipelining\u002Ffrom-seq-to-pipe","From SEQ to PIPE","We turn the sequential Y86-64 processor into a pipelined one by inserting pipeline registers between its stages so each cycle holds one instruction per stage. Doing it correctly forces a rearrangement: the next-PC computation must move into Fetch as a prediction, because the later stages that used to compute it are now busy with other instructions. We walk SEQ to SEQ+ to PIPE, spell out exactly what each pipeline register carries, and fix the naming discipline (D_stat versus d_stat) that keeps five in-flight instructions straight.\n",{"path":5884,"title":5885,"module":5877,"summary":5886},"\u002Fcomputer-architecture\u002Fpipelining\u002Fdata-hazards-stalling-and-forwarding","Data Hazards: Stalling and Forwarding","Overlapping instructions collide when a later one needs a value an earlier one has not finished computing: a read-after-write data hazard. We map exactly which instruction distances are dangerous, fix hazards the slow way by stalling (three bubbles), then the fast way by forwarding from five distinct sources into Decode, in a priority order that sequential semantics forces. Forwarding handles almost everything; the load-use hazard still needs exactly one stall.\n",{"path":5888,"title":5889,"module":5877,"summary":5890},"\u002Fcomputer-architecture\u002Fpipelining\u002Fcontrol-hazards-and-branch-prediction","Control Hazards and Branch Prediction","A pipeline must fetch an instruction every cycle, but after a conditional jump or a ret the next address is not yet known: a control hazard. We measure the branch penalty, weigh predict-taken against its alternatives with real loop arithmetic, watch PIPE detect a misprediction in Execute and squash the two wrong-path instructions, and meet the ret hazard, which has nothing to predict and stalls three cycles. A 2-bit counter gives a taste of dynamic prediction.\n",{"path":5892,"title":5893,"module":5877,"summary":5894},"\u002Fcomputer-architecture\u002Fpipelining\u002Fthe-complete-pipe-processor","The Complete PIPE Processor","We assemble the full pipelined Y86-64: five stages, five pipeline registers, forwarding paths, and a small control unit that decides, each cycle, whether to stall or bubble each register. The subtle part is when hazards combine: one pairing hides a genuine bug. A fourth control case reads stat and keeps exceptions precise. Performance reduces to CPI = 1 + lp + mp + rp, worked out to 1.27 with realistic frequencies, and PIPE beats SEQ by several times despite every penalty.\n",{"path":5896,"title":5897,"module":5898,"summary":5899},"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fstorage-technologies-and-the-latency-gap","Storage Technologies and the Latency Gap","The Memory Hierarchy","No single memory is both fast and large and cheap. We survey the technologies a machine can store bits in — SRAM, DRAM, flash, and rotating disk — open up a DRAM chip to find the row buffer, work a disk access down to the millisecond, and rank everything by speed, density, and cost per bit. Then we watch the processor outrun memory decade after decade. That widening gap is the whole reason a machine stacks fast small storage on top of slow large storage into a hierarchy.\n",{"path":5901,"title":5902,"module":5898,"summary":5903},"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Flocality","Locality","A hierarchy only pays off because programs do not touch memory at random. They reuse recently-used data (temporal locality) and touch nearby data soon after (spatial locality). We make both precise and then quantitative: miss rates for stride-1 and stride-k traversals against a concrete block size, and the loop-order pair on a 2-D array where the same sum misses 16 times one way and 64 times the other — why row-major versus column-major order can change a program's speed by an order of magnitude.\n",{"path":5905,"title":5906,"module":5898,"summary":5907},"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fcache-memories-direct-mapped","Cache Memories and Direct Mapping","A cache is fast SRAM that holds copies of recently-used blocks of main memory. We fix its organization — S sets, E lines per set, B bytes per block — and the way it dissects an address into tag, set index, and block offset, worked bit by bit on a concrete 16-byte cache. Then we run the direct-mapped (E=1) access algorithm end to end on a seven-access trace: index to a set, compare the tag, hit or miss, evict. Cold and conflict misses fall out of the structure, and a two-array ping-pong shows conflict thrashing and its padding fix.\n",{"path":5909,"title":5910,"module":5898,"summary":5911},"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fset-associative-and-write-policies","Set-Associative Caches and Write Policies","Give each set several lines and a block has a choice of homes — fewer conflict misses, at the cost of comparing E tags in parallel and choosing a victim to evict. We re-run the direct-mapped ping-pong trace on a 2-way cache and watch the conflicts vanish, weigh LRU against random replacement, then turn to writes: write-through versus write-back with a dirty bit on a hit, write-allocate versus no-write-allocate on a miss, and a worked traffic count showing when each pairing wins.\n",{"path":5913,"title":5914,"module":5898,"summary":5915},"\u002Fcomputer-architecture\u002Fmemory-hierarchy\u002Fcache-performance-and-cache-friendly-code","Cache Performance and Cache-Friendly Code","Turn the cache mechanism into a number. Hit time, miss rate, and miss penalty combine into the average memory access time; we compute AMAT for a two-level hierarchy with real numbers, weigh the design knobs against each other, and read the memory mountain. Then we write cache-friendly code — the matrix-multiply loop-order case study (ijk versus kij, misses counted per iteration) and loop blocking, where cache-sized tiles turn evicted reuse back into hits.\n",{"path":5917,"title":5918,"module":5919,"summary":5920},"\u002Fcomputer-architecture\u002Fvirtual-memory\u002Faddress-spaces-and-translation","Address Spaces and Translation","Virtual Memory","Every process runs as if it owns a private, contiguous span of memory — its virtual address space — while the hardware maps those addresses onto a single shared physical memory. We fix virtual memory's three jobs (a cache for disk, a memory manager, a protection boundary), the page as the unit of mapping, and the MMU replacing the virtual page number while the offset passes through untouched — then run one translation end to end at the bit level and trace the control flow of a page hit against a page fault.\n",{"path":5922,"title":5923,"module":5919,"summary":5924},"\u002Fcomputer-architecture\u002Fvirtual-memory\u002Fpage-tables-and-page-faults","Page Tables and Page Faults","The page table is an array of page-table entries indexed by virtual page number; each entry's valid bit says whether the page is in DRAM, on disk, or unallocated, and its permission, reference, and dirty bits drive protection and replacement. We walk translation as a table lookup, the page fault and demand paging, the clock algorithm the OS uses to approximate LRU, memory mapping and copy-on-write (why fork is cheap), the taxonomy of bad references, and thrashing.\n",{"path":5926,"title":5927,"module":5919,"summary":5928},"\u002Fcomputer-architecture\u002Fvirtual-memory\u002Fthe-tlb-and-multi-level-page-tables","The TLB and Multi-Level Page Tables","A page-table read on every access would double memory traffic; a flat table for a 48-bit space would occupy 512 GB per process. The TLB fixes the first: a small set-associative cache of PTEs inside the MMU whose tag and index come from the VPN. Multi-level page tables fix the second, allocating only the sub-tables a process uses; x86-64 walks four levels with a 9+9+9+9+12 split. We trace one reference end to end through TLB, walk, and cache, and close with the overlap trick that lets the L1 cache start before translation ends.\n",{"path":5930,"title":5931,"module":5932,"summary":5933},"\u002Fcomputer-architecture\u002Fexceptions-and-io\u002Fexceptional-control-flow","Exceptional Control Flow","Exceptions & I\u002FO","Beyond the sequential, branch, and call flow a program controls itself, the hardware can divert the processor in response to events. We sort these into four classes — interrupts (asynchronous, from devices), traps (intentional syscalls), faults (recoverable, like a page fault), and aborts (unrecoverable) — then take the mechanism apart: exception numbers and the table dispatch, what the hardware pushes and why it differs from a procedure call, the divide-error \u002F page-fault \u002F general-protection trio on x86-64, the full syscall round trip with a worked write in assembly, and processes and signals as the abstractions ECF makes possible.\n",{"path":5935,"title":5936,"module":5932,"summary":5937},"\u002Fcomputer-architecture\u002Fexceptions-and-io\u002Finterrupts-and-the-kernel","Interrupts and the Kernel","An I\u002FO device signals completion by raising an interrupt, crossing the privilege boundary from user mode into the kernel. We fix that boundary, follow an interrupt from device through the interrupt controller to its vectored handler, and use the timer interrupt to drive preemptive scheduling and the context switch. Then the I\u002FO mechanics: polling versus interrupt-driven I\u002FO with a cycle count, device registers and memory-mapped I\u002FO versus port I\u002FO, DMA's full transfer walkthrough and its cache hazard, and a disk read traced end to end, from the read syscall to the completion interrupt.\n",{"path":5939,"title":5940,"module":5941,"summary":5942},"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fprocesses-threads-and-parallelism","Processes, Threads, and Parallelism","Multithreading & Multicore","Around 2004 the single core stopped getting faster, and the industry's answer was to hand programmers more cores instead. This lesson builds the vocabulary that shift demands: process versus thread and exactly which hardware state each one owns, concurrency versus parallelism, the three kinds of parallelism a machine can exploit, why Dennard scaling ended and forced the multicore turn, and Amdahl's law — the arithmetic that bounds the speedup those cores can deliver.\n",{"path":5944,"title":5945,"module":5941,"summary":5946},"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fhardware-multithreading","Hardware Multithreading","A pipeline spends much of its life waiting — on cache misses, on dependences, on branches. Hardware multithreading fills the dead cycles with instructions from another thread. We compare coarse-grained switching (change threads on a long stall), fine-grained interleaving (change every cycle), and simultaneous multithreading (mix threads inside a single cycle), work out exactly which hardware a second thread context duplicates and which it shares, and weigh when SMT pays off and when two threads just fight over one cache.\n",{"path":5948,"title":5949,"module":5941,"summary":5950},"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fcache-coherence","Cache Coherence","Give each core its own cache and the same address can live in two places at once, with copies that disagree. We reproduce the stale-copy bug with a two-core trace, then fix it the way hardware does: snooping caches that watch a shared bus and keep every line in a protocol state. We build MSI in full, upgrade it to MESI, contrast invalidation with updating, add coherence misses as the fourth C, and end with false sharing: the performance bug where cores fight over a line while never touching the same byte.\n",{"path":5952,"title":5953,"module":5941,"summary":5954},"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fmemory-consistency-and-synchronization","Memory Consistency and Synchronization","Coherence keeps cores agreeing about one location; consistency is the contract about many. We define sequential consistency, then watch real hardware break it: the store buffer lets a load slip ahead of an older store, and the classic two-thread litmus test ends with both sides reading zero. We state x86-TSO precisely, restore order with mfence, build atomic read-modify-write from the lock prefix, xchg, and cmpxchg, and write a spinlock twice — once naively, once bus-friendly — closing with what lock-free progress actually guarantees.\n",{"path":5956,"title":5957,"module":5941,"summary":5958},"\u002Fcomputer-architecture\u002Fmultithreading-and-multicore\u002Fmulticore-organization","Multicore Organization","Where everything sits on the die. A modern die gives each core private L1 and L2 caches, spreads a shared last-level cache across slices, and wires it all together with a ring or mesh; multi-socket servers add NUMA, where memory is local to one socket and every remote access pays a latency penalty. We walk the floorplan, put numbers on local versus remote latency, meet thread affinity, and account for the two shared resources — coherence traffic and LLC capacity — that decide how far a parallel program scales.\n",{"path":5960,"title":5961,"module":5962,"summary":5963},"\u002Fcomputer-architecture\u002Fcapstone\u002Fthe-whole-machine","The Whole Machine","Capstone","We take one line of C down the whole tower the course built — compiler to assembly, assembly to machine-code bytes, the bytes into the fetch–decode–execute datapath — then trace one load and one add through the pipelined, cached, translated, interruptible machine, each step cross-linked to the lesson that built it. We close with the map of the course as a stack of layers and an accounting of what we simplified: out-of-order execution, superscalar issue, and speculation past the branch predictor.\n",{"path":5965,"title":5966,"module":5962,"summary":5967},"\u002Fcomputer-architecture\u002Fcapstone\u002Fassembling-a-complete-cpu","Assembling a Complete CPU","We bolt the parts the course built — PC, instruction memory and its fetch logic, register file, ALU, condition codes, data memory, and the control unit — into one complete CPU, name the lesson that built each, wire them in a deliberate order, and power the machine on from reset. Then we assemble a real test program (sum a four-element array through a call\u002Fret procedure), give its exact bytes and memory layout, and trace it cycle by cycle to the answer 0xabcdabcdabcd. We close with how to validate such a machine, and what it takes to put two of them on one die.\n",{"path":5969,"title":5970,"module":6,"summary":6},"\u002Fcomputer-architecture","Computer Architecture",{"path":5972,"title":5973,"module":3628,"summary":5974},"\u002Fdifferential-equations\u002Ffoundations\u002Fmodels-and-direction-fields","Models, Direction Fields, and Solution Curves","A differential equation relates an unknown function to its own rates of change. Three first-order models — a falling body, a cooling object, a population under predation — share the form dy\u002Fdt = ay - b; the slope field fixes their equilibria and long-run behavior before any formula is found. Solving the linear case gives the general solution, its integral curves, and the particular solution selected by an initial condition.\n",{"path":5976,"title":5977,"module":3628,"summary":5978},"\u002Fdifferential-equations\u002Ffoundations\u002Fclassification-and-terminology","Classifying Equations: Order, Linearity, ODE vs. PDE","Every solution method targets a specific class of equation, so the first question about any differential equation is which classes it belongs to. Four independent axes sort them: ordinary versus partial, order, linear versus nonlinear, and homogeneous versus nonhomogeneous. Systems, verification of a solution by substitution, and the split between initial and boundary value problems complete the vocabulary.\n",{"path":5980,"title":5981,"module":5982,"summary":5983},"\u002Fdifferential-equations\u002Ffirst-order\u002Flinear-first-order-integrating-factors","Linear Equations and Integrating Factors","First-Order Equations","A first-order linear equation has the unknown and its derivative to the first power only. Multiplying by an integrating factor collapses the left side into a single derivative, and one integration gives the general solution in closed form. The solution exists wherever the coefficients are continuous, and for a constant coefficient it splits into a decaying transient and a steady state set by the forcing.\n",{"path":5985,"title":5986,"module":5982,"summary":5987},"\u002Fdifferential-equations\u002Ffirst-order\u002Fseparable-and-exact","Separable and Exact Equations","Two nonlinear first-order classes solve by direct integration. A separable equation splits so that each variable can be integrated on its own side, giving an implicit relation. An exact equation is the total differential of a hidden potential function, recognized by a symmetry test on its coefficients; when the test fails, an integrating factor can sometimes restore exactness. A change of variable brings homogeneous equations into the separable class.\n",{"path":5989,"title":5990,"module":5982,"summary":5991},"\u002Fdifferential-equations\u002Ffirst-order\u002Fmodeling-first-order","Modeling with First-Order Equations","A rate law is a differential equation. Each first-order model starts from one governing principle: conservation of mass for a mixing tank, proportional change for interest and radioactive decay, Newton's law of cooling, a force balance for a body falling against drag, and Kirchhoff's law for a series circuit. Setting the derivative to zero recovers the steady state, and the transient records how the initial condition relaxes toward it.\n",{"path":5993,"title":5994,"module":5982,"summary":5995},"\u002Fdifferential-equations\u002Ffirst-order\u002Fautonomous-and-population-dynamics","Autonomous Equations, Phase Lines, and Population Dynamics","An autonomous equation y' = f(y) can be analyzed qualitatively without being solved. Its constant solutions are the zeros of f, and the sign of f between them fixes whether nearby solutions rise or fall, which the phase line records as a column of arrows. The logistic and threshold models, constant- and effort-proportional harvesting, and the properties nonlinear equations lose all follow from this reading.\n",{"path":5997,"title":5998,"module":5982,"summary":5999},"\u002Fdifferential-equations\u002Ffirst-order\u002Fexistence-uniqueness-euler","Existence, Uniqueness, and Euler's Method","Existence and uniqueness can be settled before any attempt to solve. The existence-uniqueness theorem gives sufficient conditions on f, and a standard example shows what fails when they do not hold. Picard's successive approximations build the solution as the limit of an iteration, and Euler's method turns the same tangent-line idea into a numerical procedure for the equations no formula reaches.\n",{"path":6001,"title":6002,"module":5982,"summary":6003},"\u002Fdifferential-equations\u002Ffirst-order\u002Ffirst-order-difference-equations","First-Order Difference Equations","A difference equation advances a sequence one index at a time by a rule y_{n+1} = f(y_n). The linear case y_{n+1} = rho*y_n + b solves in closed form and converges to its equilibrium exactly when the ratio has magnitude below one, which underlies compound-interest and loan calculations. The logistic difference equation shows the nonlinear counterpart: an exchange of stability, a cascade of period doublings, and the onset of chaos.\n",{"path":6005,"title":6006,"module":6007,"summary":6008},"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fhomogeneous-constant-coefficients","Homogeneous Equations, the Wronskian, and Real Roots","Second-Order Linear Equations","A second-order linear homogeneous equation with constant coefficients is solved by guessing an exponential and reducing to the quadratic characteristic equation. Two solutions span every solution exactly when their Wronskian is nonzero; that condition, superposition, and Abel's formula give the full structure of the general solution for the case of two distinct real roots.\n",{"path":6010,"title":6011,"module":6007,"summary":6012},"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fcomplex-and-repeated-roots","Complex Roots, Repeated Roots, and Reduction of Order","When the characteristic equation has complex conjugate roots, Euler's formula converts the complex exponentials into a real fundamental set of decaying or growing oscillations. When it has a repeated root, one exponential is lost and reduction of order recovers the missing second solution as $t\\,e^{rt}$. The same substitution $y = v(t)y_1(t)$ finds a second solution from any known one.\n",{"path":6014,"title":6015,"module":6007,"summary":6016},"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fnonhomogeneous-undetermined-coefficients","Nonhomogeneous Equations: Undetermined Coefficients","The general solution of a nonhomogeneous linear equation is a complementary solution plus any one particular solution. When the forcing term is a polynomial, exponential, sine, or cosine, a particular solution can be found by assuming a trial form of the same shape with unknown coefficients and solving for them. The one complication is resonance, handled by multiplying the trial by a power of $t$.\n",{"path":6018,"title":6019,"module":6007,"summary":6020},"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fvariation-of-parameters","Variation of Parameters","Variation of parameters finds a particular solution of any nonhomogeneous linear equation from a fundamental set of the homogeneous one. Replacing the constants in the complementary solution by functions and imposing one convenient constraint reduces the problem to a two-by-two linear system whose solution is expressed through the Wronskian, giving an integral formula that works for forcing terms undetermined coefficients cannot touch.\n",{"path":6022,"title":6023,"module":6007,"summary":6024},"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fmechanical-electrical-vibrations","Mechanical and Electrical Vibrations","A spring-mass-damper obeys a second-order linear equation, and so does a series RLC circuit, with the same mathematics governing both. Free undamped motion is a pure sinusoid; damping adds a decaying envelope with three regimes; periodic forcing produces a transient that dies out and a steady-state oscillation whose amplitude peaks sharply near the natural frequency, the phenomenon of resonance.\n",{"path":6026,"title":6027,"module":6007,"summary":6028},"\u002Fdifferential-equations\u002Fsecond-order-linear\u002Fhigher-order-linear","Higher-Order Linear Equations","The second-order theory extends directly to order $n$: the solution space is $n$-dimensional, spanned by any $n$ solutions with nonzero Wronskian. For constant coefficients the characteristic polynomial has degree $n$, and its roots (counted with multiplicity, real and complex) build the basis by the same rules as before. Coupled oscillators are the natural application that raises the order.\n",{"path":6030,"title":6031,"module":6032,"summary":6033},"\u002Fdifferential-equations\u002Fseries-solutions\u002Fpower-series-ordinary-points","Power Series Solutions Near Ordinary Points","Series Solutions and Special Functions","A linear equation with variable coefficients has no characteristic equation. A power series substituted into the equation matches coefficients to a recurrence relation, which near an ordinary point yields two independent analytic solutions. The radius of convergence is at least the distance from the expansion point to the nearest singular point in the complex plane.\n",{"path":6035,"title":6036,"module":6032,"summary":6037},"\u002Fdifferential-equations\u002Fseries-solutions\u002Fregular-singular-frobenius","Euler Equations, Regular Singular Points, and Frobenius","The Euler equation x^2 y'' + a x y' + b y = 0 is solved outright by y = x^r, and its three root cases fix the behavior at any regular singular point. The Frobenius method multiplies x^r by a power series; the indicial equation chooses the exponents, and equal or integer-separated roots force a logarithm in the second solution. Gauss's hypergeometric equation is the archetype containing most classical functions as special cases.\n",{"path":6039,"title":6040,"module":6032,"summary":6041},"\u002Fdifferential-equations\u002Fseries-solutions\u002Fbessel-and-special-functions","Bessel's Equation, Legendre Polynomials, and Special Functions","Bessel's equation puts the Frobenius machinery through all three of its cases and produces the functions J and Y that govern anything vibrating or diffusing with circular symmetry. The gamma function extends the factorial so that Bessel functions of every order make sense; Legendre's equation, run through the hypergeometric form, yields the polynomials that play the same role in spherical geometry. Orthogonality ties both families to the eigenfunction expansions of Sturm–Liouville theory.\n",{"path":6043,"title":6044,"module":6045,"summary":6046},"\u002Fdifferential-equations\u002Flaplace\u002Flaplace-definition-ivps","The Laplace Transform: Definition, Properties, and Solving IVPs","The Laplace Transform","The Laplace transform sends a function of time to a function of a complex frequency by integrating it against the kernel e^{-st}. Differentiation in t becomes multiplication by s, so a linear constant-coefficient initial value problem turns into an algebraic equation. Existence rests on piecewise continuity and exponential order; the derivative rule folds in the initial data; and inversion runs through a transform table and partial fractions.\n",{"path":6048,"title":6049,"module":6045,"summary":6050},"\u002Fdifferential-equations\u002Flaplace\u002Fstep-impulse-convolution","Step Functions, Discontinuous Forcing, Impulses, and Convolution","The Heaviside step function and the second shifting theorem transform switches and discontinuous forcing into exponential factors on the transform. The Dirac delta idealizes an instantaneous impulse and transforms to a pure exponential. The convolution theorem inverts a product of transforms, writes the forced response as the impulse response convolved with the input, and solves Abel's tautochrone by transform.\n",{"path":6052,"title":6053,"module":6054,"summary":6055},"\u002Fdifferential-equations\u002Fsystems\u002Fmatrices-eigenvalues-review","Matrices, Linear Systems, and the Eigenvalue Toolkit","Systems of First-Order Linear Equations","Any nth-order linear equation, and any coupled collection of them, rewrites as a single first-order system x' = P(t)x + g(t). The matrix and vector algebra behind that form, the eigenvalue problem det(A - λI) = 0 that drives every solution method, and the fundamental theory — superposition, the Wronskian, Abel's theorem — together establish that n independent solutions span all solutions.\n",{"path":6057,"title":6058,"module":6054,"summary":6059},"\u002Fdifferential-equations\u002Fsystems\u002Fconstant-coefficient-systems-phase-portraits","Homogeneous Constant-Coefficient Systems and Phase Portraits","For x' = Ax with A constant, the trial x = ξe^{rt} turns the differential equation into the eigenvalue problem Aξ = rξ. The eigenvalues fix the geometry of the phase plane: real opposite signs give a saddle, real same sign a node, complex a spiral, purely imaginary a center. Worked in the plane, these cases form the eigenvalue-type classification of equilibria.\n",{"path":6061,"title":6062,"module":6054,"summary":6063},"\u002Fdifferential-equations\u002Fsystems\u002Frepeated-eigenvalues-fundamental-matrices","Repeated Eigenvalues, Fundamental Matrices, and Nonhomogeneous Systems","When a repeated eigenvalue supplies too few eigenvectors, a generalized eigenvector supplies the missing solution as ξte^{ρt} + ηe^{ρt}, giving an improper node. A fundamental set packaged as a matrix Φ(t) yields the matrix exponential e^{At}, the propagator mapping initial states to later ones. Variation of parameters solves the nonhomogeneous system x' = Ax + g(t).\n",{"path":6065,"title":6066,"module":6067,"summary":6068},"\u002Fdifferential-equations\u002Fnumerical\u002Feuler-and-runge-kutta","Euler, Improved Euler, and Runge–Kutta","Numerical Methods","Most initial value problems have no closed-form solution, so the solution is approximated on a grid. Euler's method steps along the tangent line, the improved Euler method averages two slopes, and the classical Runge–Kutta method averages four. Each added stage raises the order of accuracy at the cost of more evaluations per step, measured by how the local and global truncation errors scale with the step size.\n",{"path":6070,"title":6071,"module":6067,"summary":6072},"\u002Fdifferential-equations\u002Fnumerical\u002Fmultistep-systems-stability","Multistep Methods, Systems, and Stability","One-step methods discard everything but the last point. Multistep methods fit a polynomial to several past values and integrate it forward: the explicit Adams–Bashforth formulas, the implicit and more accurate Adams–Moulton formulas, and predictor–corrector pairs that combine them. The same rules extend verbatim to systems in vector form. A separate concern is stability: round-off can dominate truncation, and stiff equations force a tiny step for stability even when accuracy would allow a large one.\n",{"path":6074,"title":6075,"module":6076,"summary":6077},"\u002Fdifferential-equations\u002Fnonlinear\u002Fphase-plane-autonomous-stability","The Phase Plane, Critical Points, and Stability","Nonlinear Systems and Stability","Most nonlinear systems cannot be solved in closed form, so they are studied geometrically. The phase plane turns an autonomous planar system into a family of trajectories; the five archetypes of critical point follow from the eigenvalues of the coefficient matrix; the trace-determinant plane reads off type and stability directly; and epsilon-delta definitions make stability, asymptotic stability, and instability precise.\n",{"path":6079,"title":6080,"module":6076,"summary":6081},"\u002Fdifferential-equations\u002Fnonlinear\u002Flocally-linear-and-liapunov","Locally Linear Systems and Liapunov's Method","Near a critical point a nonlinear system looks linear, and the linear part is the Jacobian. The linearization fixes the type and stability of the nonlinear critical point in every case except a center or a repeated eigenvalue. Liapunov's direct method settles those cases and bounds the basin of attraction by constructing an energy-like function, without solving the system.\n",{"path":6083,"title":6084,"module":6076,"summary":6085},"\u002Fdifferential-equations\u002Fnonlinear\u002Fcompeting-species-predator-prey-limit-cycles","Population Models, Limit Cycles, and Chaos","The phase-plane methods apply directly to interacting-population models. Competing species either coexist or drive one another to extinction, decided by a single inequality among the interaction constants; the Lotka-Volterra predator-prey system produces closed population cycles. Limit cycles and the Poincaré-Bendixson theorem, the van der Pol oscillator, and the Lorenz equations with their strange attractor carry the theory into chaos.\n",{"path":6087,"title":6088,"module":6089,"summary":6090},"\u002Fdifferential-equations\u002Fpdes-fourier-bvp\u002Ffourier-series","Fourier Series and Convergence","PDEs, Fourier Series, and Boundary Value Problems","A two-point boundary value problem has nontrivial solutions only at a discrete set of eigenvalues, the same trichotomy that governs a singular linear system. For y'' + lambda y = 0 with zero endpoints the eigenfunctions are sines and cosines, and their orthogonality gives the Euler-Fourier coefficient formulas. The convergence theorem fixes when the series returns the function, the Gibbs phenomenon measures the overshoot at a jump, and even\u002Fodd symmetry produces half-range sine and cosine series.\n",{"path":6092,"title":6093,"module":6089,"summary":6094},"\u002Fdifferential-equations\u002Fpdes-fourier-bvp\u002Fheat-wave-laplace-equations","Separation of Variables: Heat, Wave, and Laplace Equations","Separation of variables replaces a partial differential equation by a pair of ordinary ones joined through a shared separation constant. Applied to the heat equation it produces the eigenvalue problem X'' + lambda X = 0, and the solution assembles as a Fourier series in the eigenfunctions. The same steps solve the wave equation, whose modes are standing waves, and Laplace's equation, the steady-state limit posed on a region rather than an interval.\n",{"path":6096,"title":6097,"module":6089,"summary":6098},"\u002Fdifferential-equations\u002Fpdes-fourier-bvp\u002Fsturm-liouville","Sturm-Liouville Theory","The eigenvalue problem behind separation of variables generalizes to the self-adjoint Sturm-Liouville form. Lagrange's identity makes the operator symmetric, and from that one fact follow real eigenvalues, orthogonal eigenfunctions, and eigenfunction expansions that behave like Fourier series. Singular problems admit Bessel and Legendre functions, and Sturm's separation and comparison theorems describe how the eigenfunctions oscillate.\n",{"path":6100,"title":6101,"module":6102,"summary":6103},"\u002Fdifferential-equations\u002Fhistory-variations\u002Fcalculus-of-variations","The Calculus of Variations","Historical Notes and the Calculus of Variations","Ordinary calculus finds the point where a function is stationary; the calculus of variations finds the whole curve where an integral is stationary. Euler's differential equation is the necessary condition for an extremal, and it becomes integrable in three cases, solving the shortest-path, minimal-surface, and brachistochrone problems. Lagrange multipliers extend the method to isoperimetric constraints, and Hamilton's principle recovers Newton's law from a single stationary integral.\n",{"path":6105,"title":6106,"module":6102,"summary":6107},"\u002Fdifferential-equations\u002Fhistory-variations\u002Fhistorical-notes","Great Problems and the People Who Solved Them","Differential equations grew out of specific problems, not a plan: the invention of calculus by Newton and Leibniz, the Bernoulli brachistochrone challenge, Euler's flood of methods, Lagrange's analytical mechanics, Gauss and Riemann's rigor, Laplace's celestial mechanics, and Poincaré's qualitative theory. Each method descends from a named problem, and reading the subject forward from those problems explains why its parts fit together.\n",{"path":6109,"title":6110,"module":6,"summary":6},"\u002Fdifferential-equations","Differential Equations",{"path":6112,"title":6113,"module":6114,"summary":6115},"\u002Frelativity\u002Ffoundations\u002Fspecial-relativity-postulates","The Postulates of Special Relativity","Foundations of Relativity","Newton's laws are the same in every inertial frame, but Maxwell's are not: the equations of electromagnetism single out one speed, c, and the nineteenth century read that as the speed of light relative to a medium, the ether. The Michelson-Morley experiment looked for Earth's motion through that medium and found nothing. Einstein's two postulates replace the ether, and their first consequence is that simultaneity is frame-dependent.\n",{"path":6117,"title":6118,"module":6114,"summary":6119},"\u002Frelativity\u002Ffoundations\u002Florentz-transformation-spacetime","The Lorentz Transformation and Spacetime","Requiring that a light sphere stay a light sphere in every inertial frame fixes the coordinate change between frames uniquely: the Lorentz transformation, with its factor gamma. Differentiating it gives relativistic velocity addition, which caps composed speeds at c. Plotting the same events on skewed spacetime axes turns the algebra into geometry, with calibration hyperbolae, an invariant interval, and a light cone that sorts events into past, future, and elsewhere.\n",{"path":6121,"title":6122,"module":6114,"summary":6123},"\u002Frelativity\u002Ffoundations\u002Ftime-dilation-length-contraction","Time Dilation, Length Contraction, and Paradoxes","A light clock and the constancy of c give the two headline effects directly: a moving clock runs slow by gamma, and a moving rod is short by the same factor. Cosmic-ray muons reaching sea level are the standing experimental proof. The relativistic Doppler effect adds the time-dilation factor to the classical shift, and the twin and pole-barn paradoxes dissolve once the relativity of simultaneity is taken seriously.\n",{"path":6125,"title":6126,"module":6114,"summary":6127},"\u002Frelativity\u002Ffoundations\u002Frelativistic-momentum-energy","Relativistic Momentum and Energy","Conserving momentum in every inertial frame forces the redefinition p = gamma m u, which diverges as the speed approaches c. Integrating the corresponding force gives the total energy E = gamma m c-squared, whose rest term m c-squared is Einstein's mass-energy equivalence. Energy and momentum join into a four-vector whose invariant length is the rest energy, giving E-squared = (pc)-squared + (m c-squared)-squared, massless particles, and nuclear binding energy.\n",{"path":6129,"title":6130,"module":6114,"summary":6131},"\u002Frelativity\u002Ffoundations\u002Fgeneral-relativity","A Taste of General Relativity","Einstein's happiest thought was that a freely falling observer feels no gravity: a uniform gravitational field is locally indistinguishable from an accelerating frame. That equivalence principle predicts that light bends near a mass, that clocks run slow deep in a gravitational well, that Mercury's orbit precesses, and that radar echoes are delayed. Every prediction has been confirmed, and pushing the redshift to its limit gives the black hole.\n",{"path":6133,"title":6134,"module":6135,"summary":6136},"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Fminkowski-spacetime-and-the-interval","Minkowski Spacetime and the Interval","Spacetime and the Lorentz Group","The Lorentz transformation of the foundations module is repackaged as the geometry of a four-dimensional space whose invariant is not a distance but the spacetime interval. Events, worldlines, and the metric signature define a causal structure that every observer shares. Proper time is the length of a timelike worldline, and the twin paradox becomes the statement that a straight worldline accumulates the most proper time.\n",{"path":6138,"title":6139,"module":6135,"summary":6140},"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Ffour-vectors-and-index-notation","Four-Vectors and Index Notation","The index calculus that the rest of the course runs on. Contravariant and covariant components, the Minkowski metric as the machine that raises and lowers indices, and the Einstein summation convention are assembled into scalar products that are the same in every frame. The four-velocity and four-acceleration follow, together with the identity that the four-velocity has constant invariant length.\n",{"path":6142,"title":6143,"module":6135,"summary":6144},"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Fthe-lorentz-group-and-rapidity","The Lorentz Group and Rapidity","The Lorentz transformations are the linear maps that preserve the Minkowski metric, and they form the group O(1,3). Boosts are hyperbolic rotations parametrized by rapidity, which adds along a line where velocity does not. The boost and rotation generators fix the group's local structure; its four disconnected components are set by two signs; and two non-collinear boosts compose into a boost plus a rotation, the Wigner rotation behind Thomas precession.\n",{"path":6146,"title":6147,"module":6135,"summary":6148},"\u002Frelativity\u002Fspacetime-and-the-lorentz-group\u002Fdoppler-aberration-and-appearance","Doppler, Aberration, and Appearance","Light carries a null four-momentum, and boosting it produces every optical effect of relativity at once. The covariant Doppler formula follows from the transformation of frequency, aberration from the transformation of direction, and the headlight effect from the resulting concentration of light forward. The Terrell-Penrose result shows that a fast object photographs as rotated, not contracted.\n",{"path":6150,"title":6151,"module":6152,"summary":6153},"\u002Frelativity\u002Frelativistic-dynamics\u002Ffour-momentum-force-and-accelerated-motion","Four-Momentum, Four-Force, and Accelerated Motion","Relativistic Dynamics","The four-momentum packages energy and momentum into a single vector whose invariant length is the rest mass. Its proper-time derivative is the four-force, always orthogonal to the four-velocity, and a constant orthogonal four-force produces hyperbolic motion. Constant proper acceleration gives rapidity linear in proper time, the relativistic rocket equation, and the Rindler horizon behind an eternally accelerating observer.\n",{"path":6155,"title":6156,"module":6152,"summary":6157},"\u002Frelativity\u002Frelativistic-dynamics\u002Fparticle-decays-and-two-body-kinematics","Particle Decays and Two-Body Kinematics","Conservation of four-momentum fixes the kinematics of a decay from the masses alone. In the center-of-momentum frame a parent breaks into two daughters with equal and opposite momenta and energies set by the Kallen triangle function. Boosting to the lab opens the decay into a cone, and the invariant mass built from the daughters reconstructs the parent as a peak. Worked cases: the two-photon decay of the neutral pion and a heavy two-body hadronic decay.\n",{"path":6159,"title":6160,"module":6152,"summary":6161},"\u002Frelativity\u002Frelativistic-dynamics\u002Fcollisions-thresholds-and-the-cm-frame","Relativistic Collisions and Threshold Energies","Two-body collisions run on the same conserved four-momentum as decays. The invariant s sets the total energy available in the center-of-momentum frame and therefore the threshold for producing new particles. Fixed-target energy grows only as the square root of beam energy while a collider grows linearly, which is why colliders reach high energy. Compton scattering follows as a worked photon-electron collision giving the wavelength shift.\n",{"path":6163,"title":6164,"module":6152,"summary":6165},"\u002Frelativity\u002Frelativistic-dynamics\u002Fmandelstam-variables-and-invariants","Mandelstam Variables and Lorentz Invariants","For a two-to-two process the three Mandelstam invariants s, t, and u encode all the kinematics in frame-independent form. They obey a single linear constraint, the sum of the four squared masses, so only two are independent. s is the center-of-momentum energy squared, t and u are momentum transfers tied to the scattering angle, and crossing symmetry relates one amplitude across three channels through these variables.\n",{"path":6167,"title":6168,"module":6169,"summary":6170},"\u002Frelativity\u002Fcovariant-electrodynamics\u002Ffour-current-and-the-four-potential","The Four-Current and Four-Potential","Covariant Electromagnetism","Charge density and current combine into a single four-vector whose divergence is charge conservation. The scalar and vector potentials combine likewise into the four-potential, whose gauge freedom fixes to the Lorenz condition, reducing Maxwell's equations for the potentials to a single wave equation sourced by the four-current.\n",{"path":6172,"title":6173,"module":6169,"summary":6174},"\u002Frelativity\u002Fcovariant-electrodynamics\u002Fthe-electromagnetic-field-tensor","The Electromagnetic Field Tensor","The antisymmetric derivative of the four-potential is the field-strength tensor F, gauge invariant by construction, with the electric and magnetic fields as its components. Its dual exchanges E and B, and its two contractions form the Lorentz invariants that classify a field as electric, magnetic, or radiative in every frame.\n",{"path":6176,"title":6177,"module":6169,"summary":6178},"\u002Frelativity\u002Fcovariant-electrodynamics\u002Ftransformation-of-electric-and-magnetic-fields","How E and B Transform","Transforming the field tensor under a boost gives explicit rules for the electric and magnetic fields: components along the motion are unchanged, transverse components mix and pick up a gamma. The field of a uniformly moving charge compresses transversely, and the force between a current and a moving charge shows that magnetism is the relativistic shadow of electrostatics.\n",{"path":6180,"title":6181,"module":6169,"summary":6182},"\u002Frelativity\u002Fcovariant-electrodynamics\u002Fcovariant-maxwell-and-the-stress-energy-tensor","Covariant Maxwell and the Stress–Energy Tensor","Maxwell's four equations collapse into two tensor equations, one sourced by the four-current and one an identity on the field strength, with charge conservation automatic. The Lorentz force becomes a four-vector law, and the field's energy, momentum, and stress assemble into a symmetric, conserved stress–energy tensor — the object that will source gravity.\n",{"path":6184,"title":6185,"module":6186,"summary":6187},"\u002Frelativity\u002Fcurved-spacetime\u002Fthe-equivalence-principle-formalized","The Equivalence Principle","Curved Spacetime","The equality of gravitational and inertial mass promotes to a physical principle in three graded strengths — weak, Einstein, and strong. A freely falling laboratory is locally indistinguishable from an inertial frame, but the qualifier \"locally\" is essential: the size of the patch over which gravity vanishes is set by the tidal field, which no change of frame can remove. Tidal forces are the true, coordinate-independent signature of gravity, and they are what curvature will measure.\n",{"path":6189,"title":6190,"module":6186,"summary":6191},"\u002Frelativity\u002Fcurved-spacetime\u002Fmanifolds-vectors-and-the-metric","Manifolds, Vectors, and the Metric","A manifold is a space that looks locally like flat space, described by overlapping coordinate charts. Tangent vectors are directional derivatives with the coordinate basis vectors as partial-derivative operators; one-forms live in the dual space; and the metric tensor turns a coordinate line element into an invariant length. The 2-sphere and Rindler metrics serve as worked examples, including the coordinate singularities that are artefacts of the chart, not of the geometry.\n",{"path":6193,"title":6194,"module":6186,"summary":6195},"\u002Frelativity\u002Fcurved-spacetime\u002Fcovariant-derivative-and-christoffel-symbols","Parallel Transport and the Covariant Derivative","The ordinary derivative of a vector field is not a tensor, because it subtracts vectors living in different tangent spaces. A connection supplies the missing comparison: the covariant derivative adds Christoffel-symbol correction terms that cancel the coordinate artefacts. Requiring the connection to be torsion-free and to preserve the metric fixes the Christoffel symbols uniquely in terms of derivatives of the metric, giving the Levi-Civita connection that general relativity uses.\n",{"path":6197,"title":6198,"module":6186,"summary":6199},"\u002Frelativity\u002Fcurved-spacetime\u002Fgeodesics-and-the-geodesic-equation","Geodesics and the Newtonian Limit","Free fall is geodesic motion: a freely falling particle follows the straightest possible worldline, obtained either by parallel-transporting its own tangent vector or by extremizing proper time. Both routes give the geodesic equation. Affine parameters, and conserved quantities from symmetries via Killing vectors, make it solvable. In the weak-field slow-motion limit the geodesic equation reproduces Newton's law of gravity, fixing the time-time metric component as the Newtonian potential.\n",{"path":6201,"title":6202,"module":6186,"summary":6203},"\u002Frelativity\u002Fcurved-spacetime\u002Fcurvature-riemann-and-geodesic-deviation","Curvature and the Riemann Tensor","Curvature is the failure of parallel transport to commute: carrying a vector around an infinitesimal loop returns it rotated, and the rotation per unit area is the Riemann tensor. Its symmetries cut the components to twenty in four dimensions. Geodesic deviation makes it the equation of tidal forces, and its contractions — the Ricci tensor, the Ricci scalar, and the divergence-free Einstein tensor — assemble the objects the field equation is built from.\n",{"path":6205,"title":6206,"module":6186,"summary":6207},"\u002Frelativity\u002Fcurved-spacetime\u002Fthe-einstein-field-equations","The Einstein Field Equations","The field equation is assembled from a short list of requirements: a symmetric, divergence-free, second-order geometric tensor set proportional to the stress–energy tensor, with the coefficient fixed by the Newtonian limit. The cosmological constant is the one extra term the requirements allow. The Einstein–Hilbert action gives the same equation from a variational principle, and the coupled system closes the logic of the module: matter curves spacetime, and spacetime tells matter how to move.\n",{"path":6209,"title":6210,"module":6211,"summary":6212},"\u002Frelativity\u002Fthe-schwarzschild-solution\u002Fthe-schwarzschild-metric","The Schwarzschild Metric","The Schwarzschild Solution","The first exact solution of Einstein's equation follows from two assumptions, staticity and spherical symmetry, imposed on the vacuum outside a mass. Solving the vacuum field equations fixes two metric functions and produces the Schwarzschild geometry, whose one length scale is the Schwarzschild radius $r_s = 2GM\u002Fc^2$. Birkhoff's theorem shows this is the only spherical vacuum, and the far field reduces to Newtonian gravity.\n",{"path":6214,"title":6215,"module":6211,"summary":6216},"\u002Frelativity\u002Fthe-schwarzschild-solution\u002Fgeodesics-and-orbits-in-schwarzschild","Orbits in the Schwarzschild Geometry","The two Killing symmetries of the Schwarzschild metric give a conserved energy and angular momentum per unit mass, reducing geodesic motion to a one-dimensional problem in an effective potential. The potential carries an extra attractive $1\u002Fr^3$ term absent from Newton's, which caps the centrifugal barrier, produces an innermost stable circular orbit at $6GM\u002Fc^2$, and makes bound orbits precess instead of closing.\n",{"path":6218,"title":6219,"module":6211,"summary":6220},"\u002Frelativity\u002Fthe-schwarzschild-solution\u002Flight-bending-and-null-geodesics","Null Geodesics and the Photon Sphere","Light follows null geodesics, governed by a photon effective potential with a single unstable maximum at $3GM\u002Fc^2$, the photon sphere. The impact parameter sorts rays into those that escape with a deflection and those captured, with the critical value $b_c = 3\\sqrt{3}\\,GM\u002Fc^2$ dividing them. A grazing ray bends by $4GM\u002F(c^2 b)$, twice the naive Newtonian value, and the critical impact parameter sets the edge of a black hole's shadow.\n",{"path":6222,"title":6223,"module":6224,"summary":6225},"\u002Frelativity\u002Ftests-of-general-relativity\u002Fperihelion-precession-of-mercury","The Perihelion Precession of Mercury","Tests of General Relativity","A single extra term in the Schwarzschild orbit equation, cubic in the inverse radius, keeps a bound orbit from closing. The perturbation advances the perihelion by 6πGM\u002F(c²a(1−e²)) per revolution, which for Mercury is 43 arcseconds per century — exactly the anomaly left after Newtonian planetary perturbations are subtracted. A note on frame dragging closes the lesson.\n",{"path":6227,"title":6228,"module":6224,"summary":6229},"\u002Frelativity\u002Ftests-of-general-relativity\u002Fdeflection-of-light-and-gravitational-lensing","Light Deflection and Gravitational Lensing","A light ray grazing the Sun bends by 4GM\u002F(c²b), exactly twice the value a Newtonian corpuscle would give; the extra factor is the curvature of space. The 1919 eclipse confirmed it. The same bending focuses light from distant sources into Einstein rings, multiple images, and microlensing brightenings, making lensing a direct probe of mass, including mass that emits no light.\n",{"path":6231,"title":6232,"module":6224,"summary":6233},"\u002Frelativity\u002Ftests-of-general-relativity\u002Fgravitational-redshift-and-shapiro-delay","Gravitational Redshift and the Shapiro Delay","A clock deeper in a gravitational well ticks slower, and a photon climbing out loses frequency by the ratio of the metric's time-time components. Pound and Rebka measured the 2.5×10⁻¹⁵ shift over a 22.5-metre tower. Radar signals grazing the Sun return late by about 250 microseconds, the Shapiro delay. Both probe the time part of the metric directly.\n",{"path":6235,"title":6236,"module":6224,"summary":6237},"\u002Frelativity\u002Ftests-of-general-relativity\u002Frelativity-in-technology-gps","Relativity and the Global Positioning System","A GPS satellite clock runs slow by 7 microseconds a day from its orbital speed and fast by 46 from its higher gravitational potential, a net gain of about 38 microseconds a day. Left uncorrected, the timing error would grow into kilometres of position error within a day and exceed navigation tolerance within minutes. The satellites carry a pre-launch frequency offset to cancel it.\n",{"path":6239,"title":6240,"module":6241,"summary":6242},"\u002Frelativity\u002Fblack-holes\u002Fhorizons-and-coordinate-singularities","Horizons and Coordinate Singularities","Black Holes","The Schwarzschild radius is a coordinate singularity, not a curvature singularity: the metric blows up there only because the static coordinates fail, while the geometry stays finite. Eddington–Finkelstein and Kruskal– Szekeres coordinates cross the horizon smoothly and show the light cones tipping toward the center. A freely falling observer reaches the true singularity at r=0 in finite proper time, while a distant observer sees the infall freeze and redden at the horizon.\n",{"path":6244,"title":6245,"module":6241,"summary":6246},"\u002Frelativity\u002Fblack-holes\u002Frotating-and-charged-black-holes","Rotating and Charged Black Holes","A stationary black hole is fixed by three numbers: mass, angular momentum, and charge. The Reissner–Nordström metric adds charge and splits the horizon in two; the Kerr metric adds rotation, drags inertial frames, and wraps the horizon in an ergosphere where nothing can stay still. Inside the ergosphere the Penrose process extracts rotational energy, and the no-hair theorem states that no other detail of the collapsed matter survives.\n",{"path":6248,"title":6249,"module":6241,"summary":6250},"\u002Frelativity\u002Fblack-holes\u002Fblack-hole-thermodynamics","Black-Hole Thermodynamics","The four laws of black-hole mechanics mirror the four laws of thermodynamics term for term, with horizon area playing the role of entropy and surface gravity the role of temperature. Hawking's calculation makes the analogy literal: a black hole radiates at a temperature set by its surface gravity, carries a real entropy proportional to its horizon area, and slowly evaporates. The thermal spectrum raises the information paradox.\n",{"path":6252,"title":6253,"module":6254,"summary":6255},"\u002Frelativity\u002Fgravitational-waves\u002Flinearized-gravity-and-wave-solutions","Linearized Gravity and Wave Solutions","Gravitational Waves","Weak gravity is a small perturbation of flat spacetime, and the linearized Einstein equation in the Lorenz gauge is an ordinary wave equation propagating at the speed of light. The trace-reversed perturbation carries the dynamics, residual gauge freedom fixes the transverse-traceless form, and the two physical polarizations deform a ring of freely falling masses into oscillating ellipses whose fractional size change is the strain.\n",{"path":6257,"title":6258,"module":6254,"summary":6259},"\u002Frelativity\u002Fgravitational-waves\u002Fgeneration-and-the-quadrupole-formula","The Quadrupole Formula","The retarded solution of the linearized field equation gives the field of a moving source, and conservation of mass and momentum forbids monopole and dipole radiation, leaving the mass quadrupole as the leading emitter. The quadrupole formula fixes the strain and the radiated luminosity, and applied to a compact binary it predicts the inspiral chirp of rising frequency and amplitude. The Hulse-Taylor pulsar's orbital decay confirmed it to a fraction of a percent.\n",{"path":6261,"title":6262,"module":6254,"summary":6263},"\u002Frelativity\u002Fgravitational-waves\u002Fdetection-ligo-and-the-first-events","LIGO and the First Detections","A gravitational wave is measured as a differential length change of the two arms of a kilometre-scale Michelson interferometer, a strain of order ten to the minus twenty-one that moves the mirrors by a fraction of a proton radius. GW150914 recorded the inspiral, merger, and ringdown of two black holes, fixing their masses and the energy radiated, and GW170817 with its coincident gamma-ray burst and kilonova opened multimessenger astronomy.\n",{"path":6265,"title":6266,"module":6267,"summary":6268},"\u002Frelativity\u002Fcosmological-bridge\u002Fthe-cosmological-principle-and-flrw-metric","The Cosmological Principle and the FLRW Metric","A Bridge to Cosmology","Homogeneity and isotropy restrict the spacetime of the universe to a single family of metrics: a flat cosmic-time slicing of spatial sections of constant curvature, scaled by a time-dependent factor a(t). This lesson builds the Friedmann–Lemaître–Robertson–Walker metric from those symmetries, separates comoving from proper distance, and derives cosmological redshift as the stretching of wavelengths with the scale factor.\n",{"path":6270,"title":6271,"module":6267,"summary":6272},"\u002Frelativity\u002Fcosmological-bridge\u002Ffriedmann-equations-and-cosmic-dynamics","The Friedmann Equations and Cosmic Dynamics","The Einstein equation applied to the FLRW metric with a perfect-fluid source yields the two Friedmann equations and the conservation law that ties them together. This lesson derives them, defines the critical density and the density parameters that fix the spatial geometry, works out how matter, radiation, and a cosmological constant dilute and drive the expansion, and hands off to a dedicated cosmology subject.\n",{"path":6274,"title":6275,"module":6,"summary":6},"\u002Frelativity","Relativity",{"path":6277,"title":6278,"module":6,"summary":6},"\u002Fphysical-computing","Physical Computing",{"path":6280,"title":6281,"module":6282,"summary":6283},"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fblackbody-radiation-and-the-planck-quantum","Blackbody Radiation and the Planck Quantum","Origins of the Quantum","Millikan's oil-drop experiment fixed the electron charge as an indivisible unit, and the spectrum of thermal radiation forced a second, deeper quantum. Classical physics predicts an infinite energy density at short wavelengths; Planck removed the divergence by allowing a cavity oscillator to hold only energies that are integer multiples of hf, the first appearance of the quantum of action.\n",{"path":6285,"title":6286,"module":6282,"summary":6287},"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fthe-photoelectric-effect-and-the-photon","The Photoelectric Effect and the Photon","Light shone on a clean metal ejects electrons, but the details defied the wave theory: the electrons' maximum energy depends on the light's frequency, not its brightness, and there is a sharp threshold frequency below which nothing happens. Einstein resolved every anomaly by treating light as a stream of energy quanta hf, each absorbed whole by one electron, and Millikan's measurement of the stopping-potential slope confirmed h to a decade before anyone expected.\n",{"path":6289,"title":6290,"module":6282,"summary":6291},"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fx-rays-and-the-compton-effect","X-Rays and the Compton Effect","X-rays are short-wavelength electromagnetic waves produced when fast electrons are braked in a target, and their diffraction by crystals lets Bragg's law measure atomic spacings. Compton then scattered X-rays off electrons and found the wavelength shifted by an amount that only a photon carrying momentum hf\u002Fc could explain, closing the case for the particle nature of light.\n",{"path":6293,"title":6294,"module":6282,"summary":6295},"\u002Fquantum-mechanics\u002Fold-quantum-theory\u002Fthe-old-quantum-theory-bohr-and-sommerfeld","The Old Quantum Theory: Bohr, Sommerfeld, and Correspondence","Between Bohr's 1913 atom and Schrödinger's 1926 equation, physics ran on a provisional recipe: keep classical orbits, but admit only those whose action integral is a whole multiple of Planck's constant. This lesson develops the Wilson-Sommerfeld phase-integral rule, applies it to the oscillator and to the elliptical Kepler orbits of hydrogen, derives Sommerfeld's relativistic fine structure and the quantization of orbit orientation, and shows how the correspondence principle fixed intensities and selection rules. The systematic failures — helium, line intensities, the anomalous Zeeman effect — mark exactly where a theory of orbits had to give way to a theory of waves.\n",{"path":6297,"title":6298,"module":6299,"summary":6300},"\u002Fquantum-mechanics\u002Fmatter-waves\u002Fde-broglie-waves-and-electron-diffraction","De Broglie Waves and Electron Diffraction","The Wave Nature of Matter","In 1924 de Broglie proposed that every particle carries a wave of wavelength h\u002Fp. The hypothesis explains Bohr's quantized orbits as standing waves, and Davisson and Germer, then G. P. Thomson, confirmed it by diffracting electrons from crystals exactly as X-rays diffract. We derive the electron wavelength, work the Bragg analysis of the data, and give the relativistic form.\n",{"path":6302,"title":6303,"module":6299,"summary":6304},"\u002Fquantum-mechanics\u002Fmatter-waves\u002Fwave-packets-and-the-probability-interpretation","Wave Packets and the Probabilistic Wave Function","A single de Broglie wave fills all space, but a particle is localized. Adding many waves of nearby wavelength builds a wave packet that is confined and moves at the group velocity, which equals the particle velocity. Born's rule reads the squared amplitude of the wave function as a probability density, the meaning confirmed by electron interference building up one detection at a time.\n",{"path":6306,"title":6307,"module":6299,"summary":6308},"\u002Fquantum-mechanics\u002Fmatter-waves\u002Fthe-uncertainty-principle","The Uncertainty Principle and Wave-Particle Duality","The packet relations delta-k delta-x about 1 become Heisenberg's principle once momentum is hbar times wave number: position and momentum cannot both be sharp, nor energy and time. The gamma-ray microscope shows the limit is physical, not technical. It fixes the zero-point energy of a confined particle, the size of the hydrogen atom, and the natural width of spectral lines, and it frames the wave-particle duality of all matter and radiation.\n",{"path":6310,"title":6311,"module":6312,"summary":6313},"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fthe-schrodinger-equation-in-one-dimension","The Schrödinger Equation in One Dimension","Wave Mechanics in One Dimension","The wave equation for matter cannot be derived; it is postulated and judged by experiment. We build the time-dependent Schrödinger equation from the de Broglie relations, read Born's probability rule off the complex wave function, and separate the time and space dependence to get the time-independent equation whose bound-state solutions are the stationary states. The five acceptability conditions on the wave function are what force energy to be quantized.\n",{"path":6315,"title":6316,"module":6312,"summary":6317},"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fthe-free-particle-and-wave-packet-dynamics","The Free Particle and Wave-Packet Dynamics","The free particle has no bound states: its stationary solutions are non-normalizable plane waves forming a continuum. Physical states are wave packets built by superposing them, and the superposition is a Fourier transform. We delta-normalize the plane waves, assemble a Gaussian packet, solve for its exact time evolution, and read off the two facts that reconcile the wave picture with mechanics: the packet moves at the group velocity ħk\u002Fm, the classical velocity, and it spreads because its component momenta travel at different speeds.\n",{"path":6319,"title":6320,"module":6312,"summary":6321},"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fparticle-in-infinite-and-finite-square-wells","Particle in Infinite and Finite Square Wells","The infinite square well is the simplest bound-state problem: two boundary conditions quantize the energy into a ladder E_n = n² E_1, and the eigenfunctions are the standing waves of a string fixed at both ends. Relaxing the walls to a finite depth lets the wave function leak into the classically forbidden region, keeps the number of bound states finite, and turns the eigenvalue condition into a transcendental equation solved graphically.\n",{"path":6323,"title":6324,"module":6312,"summary":6325},"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Foperators-expectation-values-and-the-harmonic-oscillator","Operators, Expectation Values, and the Harmonic Oscillator","Measurable quantities are extracted from the wave function as expectation values, and each observable is represented by an operator that acts between Ψ* and Ψ — position by multiplication, momentum by a derivative, energy by the Hamiltonian. Applied to the harmonic oscillator, the machinery yields evenly spaced levels E_n = (n+½)ℏω, Gaussian- times-Hermite eigenfunctions of definite parity, and the selection rule Δn = ±1.\n",{"path":6327,"title":6328,"module":6312,"summary":6329},"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fthe-dirac-delta-potential","The Dirac-Delta Potential: A Single Bound State and Scattering","A potential concentrated at a single point is solvable in closed form and isolates the physics of matching a wave function across a discontinuity. Integrating the Schrödinger equation across the spike gives a jump condition on the derivative; the attractive delta well then supports exactly one bound state, of energy set by the strength alone, while the same spike scatters an incoming beam with a transmission that rises from zero to one. The attractive well and the repulsive barrier scatter identically yet only the well binds.\n",{"path":6331,"title":6332,"module":6312,"summary":6333},"\u002Fquantum-mechanics\u002Fwave-mechanics-1d\u002Fbarrier-penetration-and-quantum-tunneling","Barrier Penetration and Quantum Tunneling","Unbound states scatter rather than bind. A particle meeting a step is partly reflected even when it has more than enough energy to pass, and a particle meeting a barrier taller than its energy has a nonzero chance of appearing on the far side. Matching the wave function across the boundaries gives the reflection and transmission coefficients and the exponential tunneling probability that explains alpha decay, the scanning tunneling microscope, and the ammonia clock.\n",{"path":6335,"title":6336,"module":6337,"summary":6338},"\u002Fquantum-mechanics\u002Fformalism\u002Fhilbert-space-and-dirac-notation","Hilbert Space and Dirac Bra–Ket Notation","The Formalism of Quantum Mechanics","Wave mechanics is one representation of a deeper structure: quantum states are vectors in a complex inner-product space, and observables act on them as linear operators. We build that space from the axioms, introduce Dirac's kets and bras as vectors and the linear functionals that measure them, and identify the wavefunction as the components of an abstract state in the position basis. The resolution of the identity is the single algebraic tool that ties every basis, expansion, and matrix element together.\n",{"path":6340,"title":6341,"module":6337,"summary":6342},"\u002Fquantum-mechanics\u002Fformalism\u002Fobservables-hermitian-operators-and-eigenvalues","Observables, Hermitian Operators, and the Spectral Theorem","Every measurable quantity is represented by a Hermitian operator, and the reason is forced: a measurement needs real eigenvalues, orthogonal eigenvectors, and a complete eigenbasis, and Hermiticity delivers precisely those. We derive those properties from self-adjointness, state the spectral theorem, handle degeneracy, and show that two observables share an eigenbasis precisely when they commute — the algebraic condition behind compatible and incompatible measurements.\n",{"path":6344,"title":6345,"module":6337,"summary":6346},"\u002Fquantum-mechanics\u002Fformalism\u002Fthe-postulates-and-quantum-measurement","The Postulates and Quantum Measurement","With states as vectors and observables as Hermitian operators, the physical content of quantum mechanics reduces to a short list of postulates. We state them precisely, derive the Born probability rule for discrete and continuous spectra, work out projective collapse and its idempotence, compute expectation values and their variance, and state the measurement problem cleanly — the one place the postulates split unitary evolution from measurement without explaining the seam.\n",{"path":6348,"title":6349,"module":6337,"summary":6350},"\u002Fquantum-mechanics\u002Fformalism\u002Fposition-momentum-and-continuous-spectra","Position, Momentum, and Continuous Spectra","Position and momentum are the observables with no normalizable eigenstates: their spectra are continuous, their eigenkets are delta-normalized, and the two are Fourier conjugates. We derive the canonical commutator from the momentum operator, build the continuous-basis machinery (Dirac deltas replacing Kronecker deltas), show the position and momentum wavefunctions are a Fourier-transform pair, and compute expectation values in either representation.\n",{"path":6352,"title":6353,"module":6337,"summary":6354},"\u002Fquantum-mechanics\u002Fformalism\u002Fcommutators-and-the-generalized-uncertainty-principle","Commutators and the Generalized Uncertainty Principle","The commutator of two observables measures the obstruction to sharing an eigenbasis, and it bounds how sharply both can be known at once. We derive the generalized uncertainty relation from the Schwarz inequality, recover the position–momentum bound as a special case, characterize the minimum-uncertainty states that saturate it as Gaussians, and give the energy–time relation its correct reading as a lifetime bound rather than a commutator relation.\n",{"path":6356,"title":6357,"module":6337,"summary":6358},"\u002Fquantum-mechanics\u002Fformalism\u002Ftime-evolution-schrodinger-and-heisenberg-pictures","Time Evolution, Propagators, and the Heisenberg Picture","Time evolution is generated by the Hamiltonian and implemented by a unitary operator that preserves probability. We build that operator, expand a state in stationary states to see why probability densities freeze while phases wind, introduce the propagator, transfer the time dependence onto operators in the Heisenberg picture, and derive Ehrenfest's theorem — which recovers classical equations of motion for expectation values and identifies conserved quantities as observables commuting with the Hamiltonian.\n",{"path":6360,"title":6361,"module":6362,"summary":6363},"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fladder-operators-and-the-number-states","Ladder Operators and the Number States","The Oscillator Algebraically, and Symmetry","The harmonic oscillator can be solved without touching a differential equation. Factoring the Hamiltonian into a lowering operator and its adjoint turns the spectrum into pure algebra: the commutator relation fixes the ladder, the vacuum condition fixes the ground state, and the energies fall out as equally spaced rungs. The same operators give the matrix elements of position and momentum for free.\n",{"path":6365,"title":6366,"module":6362,"summary":6367},"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fcoherent-and-squeezed-states","Coherent and Squeezed States","A single number state never moves — its position expectation is pinned at the origin. The superposition that oscillates like a classical particle is the eigenstate of the annihilation operator: the coherent state. It is a displaced vacuum, carries Poissonian photon statistics, saturates the uncertainty bound, and traces a rigid Gaussian orbit in phase space. Squeezing deforms that circle, trading precision in one quadrature for noise in the other.\n",{"path":6369,"title":6370,"module":6362,"summary":6371},"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fsymmetries-generators-and-conservation-laws","Symmetries, Generators, and Conservation Laws","Every continuous symmetry of a quantum system is a unitary operator built by exponentiating a Hermitian generator: momentum generates translations, angular momentum generates rotations, the Hamiltonian generates time evolution. When a generator commutes with the Hamiltonian, the transformation leaves the dynamics unchanged and the generator is conserved — the quantum form of Noether's theorem — and any symmetry that mixes states within a level forces degeneracy.\n",{"path":6373,"title":6374,"module":6362,"summary":6375},"\u002Fquantum-mechanics\u002Foscillator-and-symmetry\u002Fparity-time-reversal-and-discrete-symmetries","Parity, Time Reversal, and Discrete Symmetries","Parity and time reversal are symmetries no continuous generator can reach. Parity is a unitary involution whose eigenvalues label states even or odd, fixing the dipole selection rules. Time reversal is antiunitary: it conjugates i, flips momenta and spins, and for half-integer spin squares to minus one, which by Kramers' theorem makes every level of a time-reversal-invariant Hamiltonian at least doubly degenerate.\n",{"path":6377,"title":6378,"module":5217,"summary":6379},"\u002Fquantum-mechanics\u002Fangular-momentum\u002Forbital-angular-momentum-and-spherical-harmonics","Orbital Angular Momentum and Spherical Harmonics","Orbital angular momentum is the operator triple built from position and momentum. Its components fail to commute, so no state carries sharp values of more than one of them, but each commutes with the total square. Solving the common eigenvalue problem in spherical coordinates quantizes both the magnitude and the projection and produces the spherical harmonics, the angular part of every central-force wavefunction.\n",{"path":6381,"title":6382,"module":5217,"summary":6383},"\u002Fquantum-mechanics\u002Fangular-momentum\u002Fthe-angular-momentum-algebra","The Angular-Momentum Algebra and Ladder Operators","The eigenvalues of angular momentum follow from the commutation relations alone, with no reference to coordinates or wavefunctions. Raising and lowering operators built from the components generate finite multiplets, force the total quantum number to be a non-negative integer or half-integer, and fix the matrix elements of every component. The half-integer values excluded by orbital motion appear here, and they are what spin realizes.\n",{"path":6385,"title":6386,"module":5217,"summary":6387},"\u002Fquantum-mechanics\u002Fangular-momentum\u002Faddition-of-angular-momenta-and-clebsch-gordan","Addition of Angular Momenta and Clebsch–Gordan Coefficients","Two angular momenta combine into a total whose allowed magnitudes run from the difference to the sum of the parts in integer steps. The change from the uncoupled product basis to the coupled total-angular-momentum basis is carried out with the lowering operator and orthogonality, and its matrix of overlaps is the table of Clebsch–Gordan coefficients. Two spin-halves split into a triplet and a singlet, the prototype for every composite spin.\n",{"path":6389,"title":6390,"module":6391,"summary":6392},"\u002Fquantum-mechanics\u002Fcentral-potentials\u002Fthe-schrodinger-equation-in-three-dimensions","The Schrödinger Equation in Three Dimensions","Central Potentials","A central potential depends only on the distance from a force center, so the three-dimensional Schrödinger equation separates in spherical coordinates. The angular factor is a spherical harmonic; the radial factor obeys a one-dimensional equation with an effective potential whose centrifugal barrier depends on the angular-momentum quantum number. The free particle and the spherical box fix the two limiting cases through the spherical Bessel functions.\n",{"path":6394,"title":6395,"module":6391,"summary":6396},"\u002Fquantum-mechanics\u002Fcentral-potentials\u002Fthe-hydrogen-atom","The Hydrogen Atom","The Coulomb potential turns the radial equation into one whose bound states exist only for a discrete set of energies. A power-series solution truncated to keep the wavefunction normalizable forces the principal quantum number, and the energy comes out proportional to minus one over its square, recovering the Rydberg spectrum. The bound states are the associated Laguerre functions times spherical harmonics, and their energy depends on the principal number alone, giving an n-squared degeneracy larger than rotational symmetry can explain.\n",{"path":6398,"title":6399,"module":6391,"summary":6400},"\u002Fquantum-mechanics\u002Fcentral-potentials\u002Fthe-isotropic-oscillator-and-hidden-symmetry","The Isotropic Oscillator and Hidden Symmetry","The three-dimensional isotropic harmonic oscillator solves in both Cartesian and spherical bases, and the two solutions must agree on the degeneracy of every level. That agreement, and the accidental degeneracy of hydrogen, both come from a symmetry larger than rotation: the oscillator carries an SU(3) invariance built from a conserved quadrupole tensor, and the Coulomb problem carries an SO(4) invariance built from the conserved Runge–Lenz vector. These hidden symmetries pin the degeneracies that rotational invariance alone leaves unexplained.\n",{"path":6402,"title":6403,"module":6404,"summary":6405},"\u002Fquantum-mechanics\u002Fspin\u002Fspin-half-pauli-matrices-and-stern-gerlach","Spin-½, the Pauli Matrices, and Stern–Gerlach","Spin","A silver atom passing through an inhomogeneous magnetic field splits into two beams, not a smear. That single fact fixes the internal angular momentum of the electron to a two-valued quantity with no spatial wavefunction. We build the two-dimensional spin space, the Pauli matrices and their algebra, the spinor for measurement along an arbitrary axis, and the sequential Stern–Gerlach filters that expose measurement disturbance.\n",{"path":6407,"title":6408,"module":6404,"summary":6409},"\u002Fquantum-mechanics\u002Fspin\u002Fspin-in-a-magnetic-field-precession-and-resonance","Spin in a Magnetic Field: Precession and Resonance","A spin coupled to a magnetic field is the simplest nontrivial quantum dynamics. A static field makes the spin expectation precess on a cone at the Larmor frequency while the energy levels split linearly. Adding a weak oscillating field and passing to the rotating frame produces Rabi oscillations and a resonance lineshape — the physics of NMR and ESR, and the driven qubit.\n",{"path":6411,"title":6412,"module":6404,"summary":6413},"\u002Fquantum-mechanics\u002Fspin\u002Ftwo-level-systems-and-the-bloch-sphere","Two-Level Systems and the Bloch Sphere","Every two-state quantum system is a spin-½ in disguise. Its Hamiltonian is an effective magnetic field, its pure states are points on the Bloch sphere, and its unitary evolution is a rigid rotation of that sphere. The same structure produces avoided level crossings, the ammonia inversion doublet and its maser, and the qubit.\n",{"path":6415,"title":6416,"module":6417,"summary":6418},"\u002Fquantum-mechanics\u002Fidentical-particles\u002Fidentical-particles-and-exchange-symmetry","Identical Particles and Exchange Symmetry","Identical Particles","Two electrons carry no label that distinguishes one from the other, and that bare fact reshapes the state space. The exchange operator that swaps particle labels commutes with any Hamiltonian built from identical particles, so its eigenvalue is conserved, and nature admits only its two extremes: totally symmetric states for bosons and totally antisymmetric states for fermions. The antisymmetry forces a statistical correlation, the exchange \"force,\" that keeps fermions apart and draws bosons together even with no interaction between them.\n",{"path":6420,"title":6421,"module":6417,"summary":6422},"\u002Fquantum-mechanics\u002Fidentical-particles\u002Fthe-pauli-principle-atoms-and-the-periodic-table","The Pauli Principle, Atoms, and the Periodic Table","Antisymmetry packaged as a Slater determinant turns the exclusion principle into an operating rule for building atoms. Helium shows the machinery in full: the electron-electron repulsion splits into a direct Coulomb integral and an exchange integral, and the exchange term alone pushes the spin-triplet (orthohelium) below the spin-singlet (parahelium) with no magnetic interaction in sight. Screening, the aufbau order, and Hund's rules then assemble the whole periodic table from the same antisymmetry.\n",{"path":6424,"title":6425,"module":6426,"summary":6427},"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Ftime-independent-perturbation-theory","Time-Independent Perturbation Theory","Approximation Methods for Bound States","Almost no realistic Hamiltonian can be solved exactly. Perturbation theory treats a hard Hamiltonian as a solvable one plus a small correction and expands the eigenvalues and eigenstates in powers of that correction. We derive the first- and second-order energy shifts and the first-order state correction for a nondegenerate level, expose the small-denominator failure that degeneracy forces, and fix it by diagonalizing the perturbation inside the degenerate subspace to find the \"good\" zeroth-order states.\n",{"path":6429,"title":6430,"module":6426,"summary":6431},"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Ffine-structure-and-the-real-hydrogen-atom","Fine Structure and the Real Hydrogen Atom","The Bohr spectrum is only the leading term. Two relativistic corrections of order alpha-squared — the relativistic kinetic-energy correction and spin–orbit coupling, joined by the Darwin term for s states — split the hydrogen levels into fine structure that depends on the total angular momentum j. We derive each shift as a first-order perturbation, combine them into a formula depending only on n and j, and continue down the energy ladder to the Lamb shift and the hyperfine 21 cm line.\n",{"path":6433,"title":6434,"module":6426,"summary":6435},"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Fthe-zeeman-and-stark-effects","The Zeeman and Stark Effects","An atom in an external field is a perturbation problem whose good basis depends on which interaction wins. A magnetic field competes with the internal spin–orbit coupling: the weak-field limit gives the anomalous Zeeman splitting set by the Landé g-factor, the strong-field limit gives the Paschen–Back pattern in the uncoupled basis, and the intermediate regime is a matrix diagonalization. An electric field gives a quadratic shift for the nondegenerate ground state and a linear splitting for the degenerate n = 2 level.\n",{"path":6437,"title":6438,"module":6426,"summary":6439},"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Fthe-variational-method","The Variational Method","The expectation of the Hamiltonian in any trial state is an upper bound on the true ground-state energy. Minimizing that expectation over a parametrized family of trial functions turns the ground-state problem into ordinary calculus and needs no small parameter. We prove the bound, apply it to the helium atom with a screened effective charge, use a two-center trial to predict binding in the hydrogen molecular ion, and extend the method to excited states through orthogonality.\n",{"path":6441,"title":6442,"module":6426,"summary":6443},"\u002Fquantum-mechanics\u002Fapproximation-methods\u002Fthe-wkb-approximation","The WKB Approximation","When the potential varies slowly on the scale of the de Broglie wavelength, the wavefunction is locally a plane wave with a position-dependent wavelength. This semiclassical picture builds the wavefunction from the classical momentum, breaks down at the turning points where the momentum vanishes, and is repaired there by connection formulas. The result recovers the Bohr–Sommerfeld quantization rule with its half-integer correction and gives the exponential tunneling rate through a smooth barrier, the Gamow factor.\n",{"path":6445,"title":6446,"module":6,"summary":6},"\u002Fquantum-mechanics","Quantum Mechanics",{"path":6448,"title":6449,"module":6450,"summary":6451},"\u002Freal-analysis\u002Ffoundations\u002Fsets-logic-functions","Sets, Logic, and Functions","Foundations and the Real Number System","The working language of analysis: quantifiers and the proof patterns (contrapositive, contradiction, induction), sets and their operations, relations and equivalence classes, and functions with their images, injections, surjections, and bijections. Cardinality is measured by bijection, and Cantor's theorem that no set surjects onto its power set forces uncountable sets to exist.\n",{"path":6453,"title":6454,"module":6450,"summary":6455},"\u002Freal-analysis\u002Ffoundations\u002Fordered-fields-completeness","Ordered Fields and the Completeness Axiom","The real numbers are the unique ordered field with the least-upper-bound property. The field and order axioms, the exact failure of the rationals (no supremum for the set of rationals below √2), and completeness as the defining axiom of ℝ lead to the first consequences: the existence of √2, the Archimedean property, and the density of ℚ in ℝ.\n",{"path":6457,"title":6458,"module":6450,"summary":6459},"\u002Freal-analysis\u002Ffoundations\u002Fabsolute-value-bounds","Absolute Value, Bounded Sets, and Inequalities","The absolute value turns the order on ℝ into a notion of distance, with the triangle inequality as the estimate underlying most later proofs. Covered: its algebra, the triangle and reverse-triangle inequalities, and the extension of the sup\u002Finf vocabulary from sets to bounded functions.\n",{"path":6461,"title":6462,"module":6450,"summary":6463},"\u002Freal-analysis\u002Ffoundations\u002Fintervals-uncountability","Intervals, Uncountability, and Decimals","Intervals are classified, and ℝ is proved uncountable two ways: a nested-interval construction and the decimal diagonal argument. Decimal expansions are built as suprema of truncations, which pins the source of their non-uniqueness (the 0.4999… equals 0.5000… identity) and the identification of the rationals with the eventually-repeating expansions. The middle-thirds Cantor set is an uncountable set of measure zero.\n",{"path":6465,"title":6466,"module":6467,"summary":6468},"\u002Freal-analysis\u002Fsequences-series\u002Fsequences-limits","Sequences and Their Limits","Sequences and Series","A sequence is a function on the natural numbers; it converges to a limit when its terms eventually stay within any prescribed tolerance of that number. The epsilon-M definition fixes the order of the quantifiers, and from it the limit is unique, every convergent sequence is bounded, and only the tail matters. Divergence to plus or minus infinity records terms that outgrow every bound.\n",{"path":6470,"title":6471,"module":6467,"summary":6472},"\u002Freal-analysis\u002Fsequences-series\u002Flimit-laws-monotone","Limit Laws and Monotone Convergence","Limits commute with sums, products, quotients, roots, and absolute values and preserve non-strict inequalities, so a limit can be assembled from the limits of its parts without returning to epsilon and M. The squeeze lemma transfers a limit through two envelopes; the monotone convergence theorem produces a limit from boundedness alone; and the ratio test settles the geometric and factorial standard limits.\n",{"path":6474,"title":6475,"module":6467,"summary":6476},"\u002Freal-analysis\u002Fsequences-series\u002Flimsup-bolzano-weierstrass","Subsequences, Limit Superior, and Bolzano–Weierstrass","A bounded sequence need not converge, but it always has convergent subsequences, and its terms cluster between two extreme values. The limit superior and inferior are the limits of the tail suprema and infima; they always exist for a bounded sequence, coincide exactly when it converges, and are its largest and smallest subsequential limits. Bolzano–Weierstrass extracts a convergent subsequence from boundedness alone.\n",{"path":6478,"title":6479,"module":6467,"summary":6480},"\u002Freal-analysis\u002Fsequences-series\u002Fcauchy-completeness","Cauchy Sequences and the Completeness of the Reals","The Cauchy criterion tests convergence without knowing the limit: a sequence converges exactly when its terms eventually all lie within any tolerance of one another. Cauchy sequences are bounded, in the reals Cauchy and convergent are equivalent, and this completeness property is interchangeable with the least-upper-bound axiom — the single feature that separates the real line from the rationals.\n",{"path":6482,"title":6483,"module":6467,"summary":6484},"\u002Freal-analysis\u002Fsequences-series\u002Fseries-convergence","Series and Convergence Tests","A series converges when its sequence of partial sums does, so every fact about sequences transfers. Geometric and telescoping series sum in closed form; the n-th term test rejects series whose terms miss zero, though the harmonic series shows the converse fails; and the comparison test against the geometric and p-series benchmarks settles most nonnegative-term series.\n",{"path":6486,"title":6487,"module":6467,"summary":6488},"\u002Freal-analysis\u002Fsequences-series\u002Fabsolute-conditional-rearrangement","Absolute Convergence, the Ratio and Root Tests, and Rearrangements","Absolute convergence is the strong form of convergence that permits free manipulation; conditional convergence is fragile. Absolute convergence implies convergence, and the ratio and root tests detect it by comparison with the geometric series. The alternating series test supplies conditionally convergent series, Riemann's theorem rearranges any of them to any sum, and Mertens' theorem multiplies series when at least one converges absolutely.\n",{"path":6490,"title":6491,"module":6492,"summary":6493},"\u002Freal-analysis\u002Fmetric-spaces\u002Fmetric-spaces-norms","Metric Spaces, Norms, and Examples","Metric Spaces and Topology","A metric is a function $d(x,y)$ obeying four axioms: nonnegativity, identity of indiscernibles, symmetry, and the triangle inequality. The Euclidean, taxicab, sup, discrete, and great-circle metrics all qualify, as does the sup metric on $C[a,b]$. Every norm induces a metric, and strongly equivalent metrics share the same open sets.\n",{"path":6495,"title":6496,"module":6492,"summary":6497},"\u002Freal-analysis\u002Fmetric-spaces\u002Fopen-closed-sets","Open and Closed Sets, Interior, Closure","Open sets are those in which every point has room to move; closed sets are their complements. From the single ball construction come the topology axioms (arbitrary unions, finite intersections), the interior, closure, and boundary of a set, and the fact that openness is always relative to the ambient space.\n",{"path":6499,"title":6500,"module":6492,"summary":6501},"\u002Freal-analysis\u002Fmetric-spaces\u002Fconvergence-completeness","Convergence, Cauchy Sequences, and Completeness","The $\\varepsilon$-$N$ definition of a limit transfers verbatim to any metric space once $|x-y|$ is replaced by $d(x,y)$. Convergent sequences characterize closed sets and closures; Cauchy sequences and completeness capture spaces with no missing limits, with $\\mathbb{R}^n$ and $C[a,b]$ complete and $\\mathbb{Q}$ and $(0,1]$ not.\n",{"path":6503,"title":6504,"module":6492,"summary":6505},"\u002Freal-analysis\u002Fmetric-spaces\u002Fcompactness","Compactness","A set is compact if every open cover has a finite subcover. In a metric space this is equivalent to sequential compactness and to being complete and totally bounded. Compact sets are closed and bounded; the Heine–Borel theorem gives the converse in $\\mathbb{R}^n$ but nowhere else in general.\n",{"path":6507,"title":6508,"module":6492,"summary":6509},"\u002Freal-analysis\u002Fmetric-spaces\u002Fconnectedness","Connectedness","A space is connected when it cannot be split into two nonempty open pieces. The connected subsets of $\\mathbb{R}$ are precisely the intervals, path- connectedness gives a constructive sufficient condition, and connectedness is a topological invariant preserved by continuous maps, the fact behind the intermediate value theorem.\n",{"path":6511,"title":6512,"module":4911,"summary":6513},"\u002Freal-analysis\u002Fcontinuity\u002Flimits-of-functions","Limits of Functions","The limit of a function at a point is an epsilon–delta condition pinning one value L as the target of f(x) as x approaches c, mirroring the sequence definition with distance replacing index. It is stated only at cluster points of the domain, is unique when it exists, and reduces to sequential limits through the Heine criterion. The algebra of limits and one-sided limits follow from that reduction.\n",{"path":6515,"title":6516,"module":4911,"summary":6517},"\u002Freal-analysis\u002Fcontinuity\u002Fcontinuous-functions","Continuous Functions","A function is continuous at c when its limit there equals its own value, lim f(x) = f(c). The epsilon–delta and sequential forms agree; sums, products, quotients, and compositions of continuous functions are continuous; and the failures split into jump, Dirichlet, popcorn, and removable types. The topological reading is that preimages of open sets are open.\n",{"path":6519,"title":6520,"module":4911,"summary":6521},"\u002Freal-analysis\u002Fcontinuity\u002Fevt-ivt","Extreme and Intermediate Value Theorems","On a closed bounded interval a continuous function attains an absolute maximum and minimum (the extreme value theorem, compactness preserved by continuity) and takes every value between its endpoint values (the intermediate value theorem, connectedness preserved). Both proofs run through Bolzano–Weierstrass and bisection, and yield root-finding, existence of k-th roots, and fixed-point theorems.\n",{"path":6523,"title":6524,"module":4911,"summary":6525},"\u002Freal-analysis\u002Fcontinuity\u002Funiform-continuity","Uniform Continuity","Uniform continuity strengthens continuity by demanding one delta that works at every point of the domain, not a delta re-chosen at each point. It separates x^2 on a compact interval from x^2 on the whole line and from 1\u002Fx near zero; continuity on a closed bounded interval is automatically uniform; uniformly continuous functions preserve Cauchy sequences and extend to endpoints; and Lipschitz continuity is the strongest of the three, through its secant-slope bound.\n",{"path":6527,"title":6528,"module":4911,"summary":6529},"\u002Freal-analysis\u002Fcontinuity\u002Fcontinuity-metric-spaces","Continuity on Metric Spaces","The epsilon–delta definition used only distances, so continuity transfers to maps between metric spaces by replacing absolute values with the two metrics. In this generality continuity still admits a sequential form, preserves compactness and connectedness, is uniform on a compact domain, and reads topologically as preimages of open sets being open, the formulation that defines homeomorphisms.\n",{"path":6531,"title":6532,"module":4911,"summary":6533},"\u002Freal-analysis\u002Fcontinuity\u002Flimits-infinity-monotone","Limits at Infinity and Monotone Functions","Treating infinity as a cluster point extends the epsilon–delta limit to x approaching plus or minus infinity, giving horizontal asymptotes and infinite limits. For monotone functions the one-sided limits always exist as suprema and infima, the discontinuities are jumps and at most countably many, the continuity is equivalent to the image being an interval, and a strictly monotone function always has a continuous inverse.\n",{"path":6535,"title":6536,"module":6537,"summary":6538},"\u002Freal-analysis\u002Fdifferentiation\u002Fthe-derivative","The Derivative","Differentiation","The derivative is the limit of the difference quotient, the slope the secant lines approach as the second point slides into the first. Differentiability forces continuity; linearity and the product, quotient, and chain rules follow from the definition; and a continuous function can fail to be differentiable, as the absolute value does at the origin.\n",{"path":6540,"title":6541,"module":6537,"summary":6542},"\u002Freal-analysis\u002Fdifferentiation\u002Fmean-value-theorem","The Mean Value Theorem","A relative extremum in the interior forces the derivative to vanish; Rolle's theorem and the mean value theorem turn that local fact into global control. The sign of the derivative fixes monotonicity, a bounded derivative yields a Lipschitz bound, and Darboux's theorem shows derivatives have the intermediate value property even where they are discontinuous.\n",{"path":6544,"title":6545,"module":6537,"summary":6546},"\u002Freal-analysis\u002Fdifferentiation\u002Ftaylors-theorem","Taylor's Theorem","Taylor's theorem generalizes the mean value theorem: an n-times differentiable function is matched near a point by a degree-n polynomial, with a Lagrange remainder that names the error exactly through one higher derivative. Iterating the mean value theorem proves it; the second-derivative test is the order-one case; and a smooth non-analytic bump separates a Taylor series from the function it fails to represent.\n",{"path":6548,"title":6549,"module":6537,"summary":6550},"\u002Freal-analysis\u002Fdifferentiation\u002Finverse-function-1d","The Inverse Function Theorem in One Variable","A nonzero derivative certifies a local inverse and fixes its slope. A strictly monotone differentiable function has a differentiable inverse whose derivative is the reciprocal of the original; the inverse function theorem removes the monotonicity hypothesis, and the reciprocal formula constructs nth roots and the logarithm's derivative, failing exactly where the derivative vanishes.\n",{"path":6552,"title":6553,"module":6554,"summary":6555},"\u002Freal-analysis\u002Friemann-integration\u002Fdarboux-integral","Partitions, Darboux Sums, and Integrability","The Riemann Integral","The Riemann integral is defined by trapping the area under a bounded function between under- and over-estimates. Partitions cut the domain into strips; lower and upper Darboux sums bracket the area; refining a partition tightens the bracket. A function is integrable exactly when the bracket can be made arbitrarily thin, and the tagged Riemann-sum limit gives the same number.\n",{"path":6557,"title":6558,"module":6554,"summary":6559},"\u002Freal-analysis\u002Friemann-integration\u002Fintegrability-classes","Which Functions Are Integrable","The Cauchy criterion certifies whole classes of functions as integrable. Continuous functions are integrable because uniform continuity makes every oscillation cap small; monotone functions are integrable because their caps telescope to a single total jump; bounded functions with finitely many discontinuities are integrable by isolating the bad points. The Dirichlet function fails, and the Lebesgue criterion names the exact boundary.\n",{"path":6561,"title":6562,"module":6554,"summary":6563},"\u002Freal-analysis\u002Friemann-integration\u002Fproperties-of-the-integral","Properties of the Integral","The integral is a linear, order-preserving, additive operator on the integrable functions. It splits across subintervals, respects inequalities, bounds the size of a function by the integral of its absolute value, and preserves products. The mean value theorem for integrals identifies the integral with an attained average height on a fixed rectangle.\n",{"path":6565,"title":4966,"module":6554,"summary":6566},"\u002Freal-analysis\u002Friemann-integration\u002Ffundamental-theorem","The fundamental theorem ties the integral to the derivative in two forms. The evaluation form computes a definite integral from any antiderivative; the differentiation form shows the area function has derivative equal to the integrand at points of continuity. Together they make differentiation and integration inverse operations, and yield integration by parts and change of variables.\n",{"path":6568,"title":6569,"module":6554,"summary":6570},"\u002Freal-analysis\u002Friemann-integration\u002Flog-exp-improper","The Logarithm, Exponential, and Improper Integrals","The integral defines transcendental functions. The logarithm is the area under 1\u002Ft, the exponential is its inverse, and their calculus properties follow from the fundamental theorem. Improper integrals extend integration to unbounded intervals and unbounded integrands as limits of proper integrals, with a p-test, a comparison test, absolute versus conditional convergence, and the integral test linking integrals to series.\n",{"path":6572,"title":6573,"module":6574,"summary":6575},"\u002Freal-analysis\u002Ffunction-sequences\u002Fpointwise-uniform-convergence","Pointwise and Uniform Convergence","Sequences and Series of Functions","A sequence of functions has two natural notions of limit. Pointwise convergence fixes each input and takes the limit of numbers; uniform convergence demands one rate that works for every input at once. The uniform norm turns the second into a statement about a single sequence of numbers, and the uniform Cauchy criterion and the Weierstrass M-test let us certify it.\n",{"path":6577,"title":6578,"module":6574,"summary":6579},"\u002Freal-analysis\u002Ffunction-sequences\u002Finterchange-of-limits","Interchange of Limits: Continuity, Integration, Differentiation","Passing to a limit inside a continuity statement, an integral, or a derivative is an interchange of two limits, and the two limits do not always commute. Uniform convergence licenses the first two swaps: the uniform limit of continuous functions is continuous, and the limit of the integrals is the integral of the limit. Differentiation needs uniform convergence of the derivatives, and counterexamples show why each hypothesis is required.\n",{"path":6581,"title":6582,"module":6574,"summary":6583},"\u002Freal-analysis\u002Ffunction-sequences\u002Fpower-series-weierstrass","Power Series and the Weierstrass Approximation Theorem","A power series converges uniformly on every closed subinterval inside its radius of convergence, together with all of its derivatives. That makes it continuous, differentiable, and integrable term by term, so a power series defines an infinitely differentiable function. The Weierstrass approximation theorem then shows that polynomials come uniformly close to any continuous function on a closed bounded interval.\n",{"path":6585,"title":6586,"module":6574,"summary":6587},"\u002Freal-analysis\u002Ffunction-sequences\u002Fpicard-ode","Picard's Existence and Uniqueness Theorem","The Banach fixed-point theorem says a contraction of a complete metric space has exactly one fixed point, found by iterating from any start. Applied to the space of continuous functions with the uniform norm, it proves Picard's theorem: a first-order differential equation with a Lipschitz right-hand side has a unique local solution. Picard iteration constructs that solution explicitly, and worked examples show the Lipschitz condition is not optional.\n",{"path":6589,"title":6590,"module":6591,"summary":6592},"\u002Freal-analysis\u002Fseveral-variables\u002Fdifferentiability-rn","The Derivative of a Map ℝⁿ → ℝᵐ","Functions of Several Variables (Introduction)","The derivative of a map between Euclidean spaces is the linear transformation of vanishing relative error, unique when it exists and represented in coordinates by the Jacobian matrix of partial derivatives. Differentiability forces continuity through a local Lipschitz bound. Existence of the partial derivatives alone does not suffice; continuity of the partials does.\n",{"path":6594,"title":6595,"module":6591,"summary":6596},"\u002Freal-analysis\u002Fseveral-variables\u002Fgradient-chain-rule","Directional Derivatives, the Gradient, and the Chain Rule","The directional derivative measures the rate of change of a scalar field along a chosen heading and equals the derivative applied to that direction. The gradient collects these into a vector that points along steepest ascent and sits orthogonal to level sets. The chain rule composes derivatives by multiplying Jacobians, and a mean value theorem holds for scalar fields but fails for vector-valued maps.\n",{"path":6598,"title":6599,"module":6591,"summary":6600},"\u002Freal-analysis\u002Fseveral-variables\u002Fhigher-derivatives-taylor-extrema","Higher Derivatives, Taylor's Theorem, and Extrema","Iterating the derivative gives a symmetric second derivative, the Hessian, whose mixed partials agree when they are continuous. Taylor's theorem expands a smooth map to any order with a Lagrange-type remainder, and at a critical point the definiteness of the Hessian decides between a local minimum, a local maximum, and a saddle.\n",{"path":6602,"title":6603,"module":6591,"summary":6604},"\u002Freal-analysis\u002Fseveral-variables\u002Finverse-implicit-theorems","The Inverse and Implicit Function Theorems","A nonlinear map with a nonsingular Jacobian is locally invertible, with the inverse's derivative given by the inverse matrix. The contraction mapping principle supplies the local inverse; the implicit function theorem then solves a system for some variables in terms of the rest whenever the relevant Jacobian block is invertible. Worked coordinate changes show both theorems in use.\n",{"path":6606,"title":6607,"module":6591,"summary":6608},"\u002Freal-analysis\u002Fseveral-variables\u002Fmultiple-integrals","Multiple Integrals","The Riemann integral of a bounded function over a closed rectangle in Euclidean space is built from Darboux upper and lower sums on a grid of subrectangles, with the same squeeze criterion that governs the one-variable integral. Continuous integrands are integrable, and a set of content zero can be ignored. Fubini's theorem evaluates a multiple integral as an iterated one in either order, and the indicator trick extends the theory to regions bounded by curves.\n",{"path":6610,"title":6611,"module":6,"summary":6},"\u002Freal-analysis","Real Analysis",{"path":6613,"title":6614,"module":3628,"summary":6615},"\u002Fabstract-algebra\u002Ffoundations\u002Fsets-functions-relations","Sets, Functions, and Equivalence Relations","Algebra is built on three prior notions: the set, the map between sets, and the equivalence relation that reorganizes a set into disjoint classes. Sets, maps (injective, surjective, bijective), fibers and preimages, and the correspondence between equivalence relations and partitions — the one structural fact reused in every later quotient construction.\n",{"path":6617,"title":6618,"module":3628,"summary":6619},"\u002Fabstract-algebra\u002Ffoundations\u002Fintegers-and-modular-arithmetic","The Integers and Modular Arithmetic","The integers carry the template every ring later imitates: well-ordering drives induction, induction drives the division algorithm, and division drives the Euclidean algorithm, gcd, Bézout's identity, and unique factorization into primes. Quotienting by congruence mod n builds the first finite arithmetic, Z\u002FnZ, whose invertible elements form the group of units.\n",{"path":6621,"title":6622,"module":6623,"summary":6624},"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fgroup-axioms-and-first-examples","Group Axioms and First Examples","Groups and Symmetry","A group is a set with one associative operation that has an identity and inverses. We state the axioms, prove that the identity, inverses, and cancellation behave as expected, define the order of a group and of an element, and catalogue the running examples: the integers, the additive group of residues mod n, and the multiplicative group of units mod n.\n",{"path":6626,"title":6627,"module":6623,"summary":6628},"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fdihedral-and-symmetric-groups","Dihedral and Symmetric Groups","The dihedral group D_{2n} is the symmetries of a regular n-gon, generated by a rotation r and a reflection s subject to three relations. The symmetric group S_n is all permutations of n objects, written in cycle notation. Orders, generators and relations, cycle decomposition, the order of a permutation from its cycle type, and the parity that splits S_n in half.\n",{"path":6630,"title":6631,"module":6623,"summary":6632},"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fmatrix-and-quaternion-groups","Matrix and Quaternion Groups","Invertible matrices over a field form the general linear group GL_n(F), with the determinant-one matrices as the subgroup SL_n(F). Over a finite field the order of GL_n(F) has a clean product formula. The quaternion group Q_8 is a second small nonabelian group, distinct from the dihedral group of the same order; its multiplication and subgroup structure sharpen the contrast between the two.\n",{"path":6634,"title":6635,"module":6623,"summary":6636},"\u002Fabstract-algebra\u002Fgroups-and-symmetry\u002Fhomomorphisms-and-group-actions","Homomorphisms, Isomorphisms, and Actions","A homomorphism is a map between groups that respects the operation; an isomorphism is a bijective one, making two groups the same up to relabeling. The kernel and image measure how far a homomorphism is from injective and surjective. A group action realizes a group as permutations of a set, and actions correspond exactly to homomorphisms into a symmetric group, with orbits and stabilizers as the first tools for counting.\n",{"path":6638,"title":6639,"module":6640,"summary":6641},"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fsubgroups-and-substructures","Subgroups and Their Substructures","Subgroups and Quotients","A subgroup is a subset that is a group under the inherited operation. One test decides it: nonempty and closed under the map $(x,y) \\mapsto xy^{-1}$. From an arbitrary subset $A$ we build the centralizer, normalizer, and center, and from an action the stabilizer and kernel, all of them subgroups nested in a fixed chain inside $G$.\n",{"path":6643,"title":6644,"module":6640,"summary":6645},"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fcyclic-groups","Cyclic Groups","A cyclic group is generated by one element. Two facts organize the whole theory: the order of an element equals the order of the subgroup it generates, and cyclic groups of equal order are isomorphic, so $\\mathbb{Z}$ and $\\mathbb{Z}\u002Fn\\mathbb{Z}$ are the only ones. From there the generators ($\\varphi(n)$ of them), the subgroups (one per divisor of $n$), and a fast exponentiation algorithm all follow.\n",{"path":6647,"title":6648,"module":6640,"summary":6649},"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fgeneration-and-subgroup-lattices","Generation and the Lattice of Subgroups","The subgroup generated by a subset $A$ is the smallest subgroup containing it, described top-down as an intersection and bottom-up as the set of words in $A$ and its inverses. Collecting all subgroups and ordering them by containment produces the subgroup lattice, whose Hasse diagram shows the joins, meets, and containment relations among all subgroups.\n",{"path":6651,"title":6652,"module":6640,"summary":6653},"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fcosets-lagrange-and-normal-subgroups","Cosets, Lagrange, and Normal Subgroups","The left cosets of a subgroup partition a group into equal-sized blocks, so the order of a subgroup divides the order of the group: Lagrange's theorem. When the blocks can be multiplied consistently — exactly when the subgroup is normal — they form the quotient group $G\u002FN$. Fermat's and Euler's theorems fall out as index computations.\n",{"path":6655,"title":6656,"module":6640,"summary":6657},"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fisomorphism-theorems","The Isomorphism Theorems","Four theorems relate homomorphisms, quotients, and subgroup lattices. The first identifies the image of a homomorphism with the quotient by its kernel; the second and third compute quotients built from two subgroups and quotients of quotients; the fourth matches the subgroups of $G\u002FN$ with the subgroups of $G$ lying above $N$. Together they make quotient groups computable.\n",{"path":6659,"title":6660,"module":6640,"summary":6661},"\u002Fabstract-algebra\u002Fsubgroups-and-quotients\u002Fcomposition-series-and-the-alternating-group","Composition Series and the Alternating Group","A composition series breaks a finite group into simple quotient factors, and Jordan-Hölder says those factors are unique up to order. This turns classification into two problems: list the simple groups, and describe how to reassemble them. The sign homomorphism splits $S_n$ into even and odd permutations, defining the alternating group $A_n$, simple for $n \\ge 5$.\n",{"path":6663,"title":6664,"module":6665,"summary":6666},"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Factions-and-cayleys-theorem","Actions, Orbits, and Cayley's Theorem","Group Actions and Sylow Theory","A group action turns abstract elements into permutations of a set. The action splits the set into orbits, and the orbit-stabilizer theorem ties each orbit's size to the index of a stabilizer. Applied to a group acting on itself by left multiplication, this gives Cayley's theorem: every group is a group of permutations.\n",{"path":6668,"title":6669,"module":6665,"summary":6670},"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Fconjugation-and-the-class-equation","Conjugation and the Class Equation","A group acts on itself by conjugation, and the orbits are the conjugacy classes. Orbit-stabilizer turns the resulting partition into the class equation, which forces every group of prime-power order to have a nontrivial center. Conjugacy in the symmetric group is cycle type, and Burnside's lemma counts orbits by averaging fixed points.\n",{"path":6672,"title":6673,"module":6665,"summary":6674},"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Fsylow-theorems","The Sylow Theorems","Lagrange's theorem forbids subgroups whose order fails to divide the group order; Sylow's theorems supply a partial converse for prime powers. A Sylow p-subgroup always exists, all of them are conjugate, and their count satisfies two congruence-and-divisibility constraints tight enough to prove many groups non-simple from their order alone.\n",{"path":6676,"title":6677,"module":6665,"summary":6678},"\u002Fabstract-algebra\u002Fgroup-actions-and-sylow\u002Fautomorphisms-and-simple-groups","Automorphisms and Simplicity of Aₙ","Conjugation makes a group act on itself and on its normal subgroups by automorphisms, giving the inner automorphism group G\u002FZ(G) and the embedding of N(H)\u002FC(H) into Aut(H). Characteristic subgroups are those every automorphism fixes, and the automorphism group of a cyclic group is its unit group. The lesson closes by proving the alternating group Aₙ is simple for n ≥ 5.\n",{"path":6680,"title":6681,"module":6682,"summary":6683},"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fdirect-products-and-finite-abelian-groups","Direct Products and Finite Abelian Groups","Products and Group Structure","The direct product assembles a larger group from componentwise copies of smaller ones, and a recognition theorem reverses the process when two normal subgroups meet trivially and span the group. The Fundamental Theorem of Finitely Generated Abelian Groups then classifies every such group by two equivalent invariants, invariant factors and elementary divisors.\n",{"path":6685,"title":6686,"module":6682,"summary":6687},"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fsemidirect-products","Semidirect Products","The semidirect product relaxes the direct product by requiring only one factor to be normal, with the other acting on it through a homomorphism into its automorphism group. This single twisting map lets abelian pieces assemble into non-abelian groups, realizes the dihedral groups as $\\mathbb{Z}_n \\rtimes \\mathbb{Z}_2$, and, with a recognition theorem, classifies groups of several small orders.\n",{"path":6689,"title":6690,"module":6682,"summary":6691},"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fnilpotent-and-solvable-groups","p-Groups, Nilpotent, and Solvable Groups","Finite p-groups have nontrivial center, and iterating the center upward builds the nilpotent groups, which decompose as the direct product of their Sylow subgroups. Iterating the commutator downward builds the solvable groups, whose factors are abelian. The chain cyclic, abelian, nilpotent, solvable orders these classes, and A_5 breaks the last link.\n",{"path":6693,"title":6694,"module":6682,"summary":6695},"\u002Fabstract-algebra\u002Fproducts-and-group-structure\u002Fclassifying-small-groups","Classifying Groups of Small Order","With Sylow's theorem to force normal subgroups, direct and semidirect products to assemble them, and presentations to name the result, every group up to order fifteen can be listed explicitly. Free groups make presentations precise: generators with no relations, from which any group is a quotient by the normal closure of its relations.\n",{"path":6697,"title":6698,"module":6699,"summary":6700},"\u002Fabstract-algebra\u002Fring-theory\u002Frings-definitions-and-examples","Rings: Definitions and Examples","Ring Theory","A ring carries two operations: an abelian group under addition and an associative multiplication linked by the distributive laws. The named special cases — commutative rings, integral domains, division rings, and fields — differ only in how their multiplication behaves. Standard examples include quadratic integer rings, polynomial rings, matrix rings, and group rings.\n",{"path":6702,"title":6703,"module":6699,"summary":6704},"\u002Fabstract-algebra\u002Fring-theory\u002Fideals-quotients-and-homomorphisms","Ideals, Quotient Rings, and Homomorphisms","Ring homomorphisms have kernels that absorb multiplication; such subsets are ideals, and every ideal is the kernel of the projection onto a quotient ring. The quotient construction yields the ring isomorphism theorems and classifies ideals by their quotients: R\u002FI is a field exactly when I is maximal, an integral domain exactly when I is prime.\n",{"path":6706,"title":6707,"module":6699,"summary":6708},"\u002Fabstract-algebra\u002Fring-theory\u002Ffractions-and-the-chinese-remainder-theorem","Fields of Fractions and the CRT","Rings of fractions invert a multiplicatively closed set, enlarging an integral domain into its field of fractions the way Z becomes Q. The Chinese Remainder Theorem splits a quotient by comaximal ideals into a direct product, generalizing Z\u002FmnZ ≅ Z\u002FmZ × Z\u002FnZ and explaining why the Euler function is multiplicative.\n",{"path":6710,"title":6711,"module":6712,"summary":6713},"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Feuclidean-domains-pids-ufds","Euclidean Domains, PIDs, and UFDs","Factorization and Polynomial Rings","Three classes of integral domain, ordered by how much of elementary arithmetic survives: Euclidean domains carry a division algorithm, principal ideal domains make every ideal a single multiple, and unique factorization domains factor every element into irreducibles in one way. We prove the chain ED implies PID implies UFD, the classes are separated by explicit counterexamples, and irreducible and prime coincide exactly in a UFD.\n",{"path":6715,"title":6716,"module":6712,"summary":6717},"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Fpolynomial-rings-over-fields","Polynomial Rings over Fields","When the coefficients form a field, polynomial long division works exactly as it does over the rationals, and it works with a unique quotient and remainder. That single fact makes F[x] a Euclidean domain, hence a PID and a UFD: every ideal is the multiples of one polynomial, roots correspond to linear factors, and F[x]\u002F(f) is a field precisely when f is irreducible.\n",{"path":6719,"title":6720,"module":6712,"summary":6721},"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Fgauss-lemma-and-unique-factorization","Gauss's Lemma and Unique Factorization","A UFD is not a field, so its polynomial ring is not a PID — yet unique factorization survives the passage from R to R[x]. Gauss's lemma supplies the passage: a polynomial that factors over the fraction field already factors over R, once content is factored out. This gives the theorem that R[x] is a UFD whenever R is, so Z[x] and Q[x,y] factor uniquely even though neither is a PID.\n",{"path":6723,"title":6724,"module":6712,"summary":6725},"\u002Fabstract-algebra\u002Ffactorization-and-polynomials\u002Firreducibility-criteria-and-groebner","Irreducibility Criteria and Gröbner Bases","Deciding whether a given polynomial is irreducible, and computing in multivariate polynomial rings. In one variable: the rational root test, reduction modulo a prime, and Eisenstein's criterion. In several variables, where division fails, a monomial order gives leading terms, a Gröbner basis restores a well-defined remainder, and Buchberger's algorithm computes it.\n",{"path":6727,"title":6728,"module":6729,"summary":6730},"\u002Fabstract-algebra\u002Fmodule-theory\u002Fintroduction-to-modules","Introduction to Modules","Module Theory","A module is an abelian group on which a ring acts, generalizing both vector spaces (when the ring is a field) and abelian groups (when the ring is the integers). Submodules, homomorphisms, quotients, and the isomorphism theorems carry over from groups, and an F[x]-module is the same datum as a vector space with a chosen linear operator — the correspondence behind the canonical forms.\n",{"path":6732,"title":6733,"module":6729,"summary":6734},"\u002Fabstract-algebra\u002Fmodule-theory\u002Ffree-modules-and-direct-sums","Generation, Direct Sums, and Free Modules","A generating set spans a module by R-linear combinations; a direct sum decomposes it into independent pieces; a free module has a basis and the universal property that a homomorphism is determined by arbitrary values on that basis. Rank is well defined over a commutative ring, torsion blocks a basis, and every module is a quotient of a free one — a presentation by generators and relations.\n",{"path":6736,"title":6737,"module":6729,"summary":6738},"\u002Fabstract-algebra\u002Fmodule-theory\u002Ftensor-products-and-exact-sequences","Tensor Products and Exact Sequences","The tensor product builds a module in which elements of two modules can be multiplied, characterized by a universal property turning bilinear maps into linear ones; extension of scalars is its guiding case. Exact sequences track how a module is assembled from a submodule and a quotient, when that assembly splits, and which modules — projective, injective, flat — make the Hom and tensor functors preserve exactness.\n",{"path":6740,"title":6741,"module":6729,"summary":6742},"\u002Fabstract-algebra\u002Fmodule-theory\u002Fvector-spaces-and-linear-maps","Vector Spaces and Linear Maps","A vector space is a module over a field, and the field hypothesis removes every pathology a general module can have: every vector space is free, so it has a basis, a well-defined dimension, and a coordinate isomorphism with F^n. Linear maps become matrices, change of basis becomes similarity, every space pairs with a dual of the same dimension, and the determinant is the unique alternating multilinear normalized form.\n",{"path":6744,"title":6745,"module":6746,"summary":6747},"\u002Fabstract-algebra\u002Fmodules-over-pids\u002Fstructure-theorem-over-pids","The Structure Theorem for Modules over a PID","Modules over PIDs and Canonical Forms","Every finitely generated module over a principal ideal domain splits as a free part plus a direct sum of cyclic torsion pieces, in two canonical ways: invariant factors, tied together by a divisibility chain, and elementary divisors, one prime power at a time. Existence follows from the stacked-basis theorem, both lists are unique, and the case $R = \\mathbb{Z}$ is the classification of finitely generated abelian groups.\n",{"path":6749,"title":6750,"module":6746,"summary":6751},"\u002Fabstract-algebra\u002Fmodules-over-pids\u002Frational-canonical-form","Rational Canonical Form","A linear operator turns its vector space into a module over the polynomial ring $F[x]$, with $x$ acting as the operator. The structure theorem's invariant factors then become polynomials, each cyclic summand becomes a companion matrix, and the block-diagonal assembly is the rational canonical form. It is unique, it is computed inside the base field, and two matrices are similar exactly when their rational canonical forms agree.\n",{"path":6753,"title":6754,"module":6746,"summary":6755},"\u002Fabstract-algebra\u002Fmodules-over-pids\u002Fjordan-canonical-form","Jordan Canonical Form","When the base field contains all the eigenvalues, the elementary divisors of an operator are powers of linear polynomials, and each cyclic summand becomes a Jordan block: an eigenvalue on the diagonal with ones just above it. Stacking the blocks gives the Jordan canonical form, unique up to reordering, as close to diagonal as the operator allows. Diagonalizability reads off the minimal polynomial, and the block sizes are counted by ranks of powers of the operator minus the eigenvalue.\n",{"path":6757,"title":6758,"module":6759,"summary":6760},"\u002Fabstract-algebra\u002Ffield-theory\u002Ffield-extensions-and-algebraic-elements","Field Extensions and Algebraic Elements","Field Theory","A field extension makes a larger field K into a vector space over a smaller field F, and its degree [K:F] is that dimension. Adjoining a root of an irreducible polynomial builds a simple extension F(α) isomorphic to F[x]\u002F(m), whose degree is the degree of the minimal polynomial. The tower law makes these degrees multiply, which turns algebra over fields into bookkeeping with integers.\n",{"path":6762,"title":6763,"module":6759,"summary":6764},"\u002Fabstract-algebra\u002Ffield-theory\u002Fstraightedge-and-compass-constructions","Straightedge-and-Compass Constructions","The lengths a straightedge and compass can build from a unit form a field closed under square roots, and every constructible number lies in a tower of quadratic extensions. So its degree over the rationals is a power of two. That single obstruction settles three problems the Greeks left open: doubling the cube, trisecting a general angle, and squaring the circle are all impossible.\n",{"path":6766,"title":6767,"module":6759,"summary":6768},"\u002Fabstract-algebra\u002Ffield-theory\u002Fsplitting-fields-and-algebraic-closure","Splitting Fields and Algebraic Closure","The splitting field of a polynomial is the smallest extension in which it factors into linear pieces, obtained by adjoining all its roots. Every polynomial has one, its degree is at most n factorial, and any two splitting fields are isomorphic. Pushing this to all polynomials at once gives the algebraic closure, a field in which every polynomial splits and which is unique up to isomorphism.\n",{"path":6770,"title":6771,"module":6759,"summary":6772},"\u002Fabstract-algebra\u002Ffield-theory\u002Fseparable-and-cyclotomic-extensions","Separable Extensions and Cyclotomic Fields","A polynomial is separable when its roots are distinct, detected by whether it shares a factor with its formal derivative. Over perfect fields — characteristic zero and finite fields — every irreducible is separable, and the existence and uniqueness of the finite fields follow. Cyclotomic polynomials package the roots of unity by order, are irreducible over the rationals, and give the cyclotomic field its degree phi(n).\n",{"path":6774,"title":6775,"module":6776,"summary":6777},"\u002Fabstract-algebra\u002Fgalois-theory\u002Fthe-galois-correspondence","The Galois Correspondence","Galois Theory","Galois theory attaches to a field extension its group of symmetries and shows that, for the right extensions, the subgroups of that group are in exact order-reversing correspondence with the intermediate fields. The automorphism group, Artin's theorem, the characterization of Galois extensions, and the Fundamental Theorem together turn questions about fields into questions about finite groups.\n",{"path":6779,"title":6780,"module":6776,"summary":6781},"\u002Fabstract-algebra\u002Fgalois-theory\u002Ffinite-fields","Finite Fields","Every finite field has prime-power order, is the splitting field of $x^{p^n} - x$, and is unique up to isomorphism. Its extension over the prime field is Galois with cyclic group generated by the Frobenius map $x \\mapsto x^p$, so the Galois correspondence reduces the subfield lattice to the divisor lattice of $n$. Möbius inversion counts the irreducible polynomials of each degree, and cyclic error-correcting codes are one application.\n",{"path":6783,"title":6784,"module":6776,"summary":6785},"\u002Fabstract-algebra\u002Fgalois-theory\u002Fcyclotomic-and-abelian-extensions","Cyclotomic and Abelian Extensions","The Galois group of the $n$th cyclotomic field over $\\mathbb{Q}$ is the unit group $(\\mathbb{Z}\u002Fn\\mathbb{Z})^\\times$, which makes cyclotomic fields the worked catalogue of abelian extensions of $\\mathbb{Q}$. The isomorphism identifies subfields with subgroups, realizes every finite abelian group as a Galois group over $\\mathbb{Q}$, and leads to Kronecker–Weber. Composites of Galois extensions and the primitive element theorem supply the machinery.\n",{"path":6787,"title":6788,"module":6776,"summary":6789},"\u002Fabstract-algebra\u002Fgalois-theory\u002Fgalois-groups-of-polynomials","Galois Groups of Polynomials","Ordering the roots of a separable polynomial embeds its Galois group in the symmetric group $S_n$, and the group is transitive exactly when the polynomial is irreducible. The discriminant decides membership in $A_n$; for cubics and quartics the resolvent cubic pins the group down; and reduction modulo a prime produces elements of prescribed cycle type, the standard tool for computing Galois groups over $\\mathbb{Q}$.\n",{"path":6791,"title":6792,"module":6776,"summary":6793},"\u002Fabstract-algebra\u002Fgalois-theory\u002Fsolvability-by-radicals-and-the-quintic","Solvability by Radicals and the Quintic","A polynomial is solvable by radicals exactly when its Galois group is solvable. Cyclic extensions are radical extensions once roots of unity are present, which turns a radical tower into a solvable subnormal series. Since $S_n$ is solvable only for $n \\le 4$, the general quintic has no radical formula, and an explicit quintic with Galois group $S_5$ has roots provably not expressible in radicals.\n",{"path":6795,"title":6796,"module":6797,"summary":6798},"\u002Fabstract-algebra\u002Fcapstone\u002Fcommutative-algebra-and-algebraic-geometry","A Glimpse of Commutative Algebra and Algebraic Geometry","Capstone: Where Algebra Goes Next","Commutative algebra reads geometry off the ring of polynomial functions. The dictionary runs through Noetherian rings and the ascending chain condition, Hilbert's Basis Theorem, affine algebraic sets and the two maps connecting ideals to zero sets, radicals, the Zariski topology, and Hilbert's Nullstellensatz, which over an algebraically closed field makes radical ideals and algebraic sets the same object.\n",{"path":6800,"title":6801,"module":6797,"summary":6802},"\u002Fabstract-algebra\u002Fcapstone\u002Frepresentation-and-character-theory","A Glimpse of Representation and Character Theory","Representation theory studies a group by the ways it can act linearly on a vector space. Representations are equivalent to modules over the group ring; Maschke's theorem gives complete reducibility, the Wedderburn consequences bound the irreducible degrees, and character theory reduces a representation to a trace invariant governed by the orthogonality relations and displayed in the character table of a small group.\n",{"path":6804,"title":6805,"module":6,"summary":6},"\u002Fabstract-algebra","Abstract Algebra",{"path":6807,"title":6808,"module":6809,"summary":6810},"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fatomic-spectra-rutherford","Atomic Spectra and Rutherford's Nucleus","Early Atomic Models and the Old Quantum Theory","Atoms emit light only at sharp, reproducible wavelengths, and by 1890 those wavelengths were captured by the Rydberg-Ritz formula. Neither empirical regularity had a mechanical explanation. Rutherford's alpha-scattering experiment supplied the missing structure: the atom's positive charge and nearly all its mass sit in a tiny central nucleus, with the electrons far outside.\n",{"path":6812,"title":6813,"module":6809,"summary":6814},"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fbohr-model-hydrogen","The Bohr Model of Hydrogen","Bohr grafted three quantum postulates onto Rutherford's nuclear atom: certain orbits do not radiate, radiation accompanies a jump between them, and quantization must match classical physics for large orbits. Quantizing the angular momentum fixes the orbit radii and energies, reproduces the Rydberg-Ritz formula, and predicts the Rydberg constant from fundamental constants alone.\n",{"path":6816,"title":6817,"module":6809,"summary":6818},"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fx-ray-spectra-franck-hertz","X-Ray Spectra and the Franck-Hertz Experiment","Two 1913-14 experiments confirmed the Bohr-Rutherford atom independently of optical spectra. Moseley found that the square root of a characteristic X-ray frequency is linear in atomic number, fixing Z as nuclear charge and ordering the periodic table. Franck and Hertz measured discrete atomic energy levels directly by scattering electrons through a mercury vapor.\n",{"path":6820,"title":6821,"module":6809,"summary":6822},"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fbohr-sommerfeld-old-quantum-theory","The Bohr-Sommerfeld Old Quantum Theory","Bohr fixed the hydrogen levels with a single quantum number by quantizing angular momentum. Sommerfeld replaced that ad hoc rule with a general prescription: quantize the action of each separable coordinate. The rule produces elliptical orbits, a second (azimuthal) quantum number, space quantization, and — once the relativistic mass variation is included — a fine-structure splitting that matches experiment to order alpha squared.\n",{"path":6824,"title":6825,"module":6809,"summary":6826},"\u002Fatomic-physics\u002Fearly-models-and-old-quantum-theory\u002Fold-quantum-theory-limits-wkb","Limits of the Old Quantum Theory and the WKB Bridge","The old quantum theory works only where the classical motion is separable into independent periodic coordinates. It fails for helium, forbids the correct zero angular momentum of the hydrogen ground state, and misses the half-integer in the oscillator and in molecular spectra. The WKB quantization condition, derived from the Schrodinger equation, is the modern descendant of the Sommerfeld rule and repairs the half-integer through the Maslov correction.\n",{"path":6828,"title":6829,"module":6830,"summary":6831},"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fschrodinger-3d-hydrogen","The Schrödinger Equation in Three Dimensions and Hydrogen","The Quantum Hydrogen Atom","Extending the Schrödinger equation to three dimensions and separating it in spherical coordinates produces three ordinary differential equations, one per coordinate. Their boundary conditions generate the quantum numbers n, ℓ, and mℓ, quantize the angular momentum to √(ℓ(ℓ+1))ℏ with projections mℏ, and fix the bound-state energies of hydrogen at −Z²(13.6 eV)\u002Fn².\n",{"path":6833,"title":6834,"module":6830,"summary":6835},"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fhydrogen-wave-functions","Hydrogen Wave Functions and Orbitals","The hydrogen wave functions factor into a radial part Rₙℓ(r) and an angular spherical harmonic Yℓm(θ,φ). Squaring gives the probability cloud; the radial distribution P(r) = r²|ψ|² peaks at the Bohr radius for the ground state and at the Bohr orbits for excited states. The angular part fixes the s, p, and d orbital shapes that govern chemical bonding.\n",{"path":6837,"title":6838,"module":6830,"summary":6839},"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fradial-equation-in-full","Solving the Radial Equation in Full","The hydrogen radial equation is solved from the differential equation up. The substitution u = rR turns it into a one-dimensional problem with a centrifugal barrier; matching the asymptotic behaviour at the origin and at infinity peels off the factors r^(ℓ+1) and e^(−r\u002Fna₀); a Frobenius series for the remainder must terminate, and that termination condition yields the quantization n ≥ ℓ+1 with E = −Z²Ry\u002Fn². The surviving polynomials are the associated Laguerre functions, whose degree n−ℓ−1 counts the radial nodes.\n",{"path":6841,"title":6842,"module":6830,"summary":6843},"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fsymmetry-degeneracy-runge-lenz","Accidental Degeneracy and the Runge-Lenz Symmetry","Hydrogen energies depend only on n, so states of different ℓ at the same n are degenerate. This is not a coincidence but the mark of a hidden symmetry: the quantum Runge-Lenz vector is conserved for the 1\u002Fr potential alone, and together with angular momentum it generates the group SO(4). The Casimir invariant of that group reproduces E = −Z²Ry\u002Fn² and its representations count the n² states. Any departure from 1\u002Fr breaks the symmetry and lifts the ℓ-degeneracy.\n",{"path":6845,"title":6846,"module":6830,"summary":6847},"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fexpectation-values-virial","Expectation Values, the Virial Theorem, and Scaling","The radial matrix elements ⟨r^k⟩ of hydrogenic states are the raw material of every later correction. This lesson derives ⟨1\u002Fr⟩ from the virial theorem, builds the full family ⟨r⟩, ⟨r²⟩, ⟨1\u002Fr²⟩, ⟨1\u002Fr³⟩ from Kramers' recursion and the Feynman-Hellmann theorem, and reads off their scaling with n, ℓ, and Z. The virial balance ⟨T⟩ = −½⟨V⟩ = −E fixes the energy budget of every bound state.\n",{"path":6849,"title":6850,"module":6830,"summary":6851},"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Fquantum-defects-alkali-spectra","Quantum Defects and Alkali Spectra","An alkali atom is one valence electron outside a closed-shell core, and to a good approximation it is hydrogen with a modified quantum number. Core penetration makes low-ℓ states more bound than the Coulomb formula predicts, and the shortfall is captured by a single number per ℓ, the quantum defect δℓ. The spectrum then follows the Rydberg formula with n replaced by the effective n − δℓ, and the sodium D-line doublet is the worked case.\n",{"path":6853,"title":6854,"module":6830,"summary":6855},"\u002Fatomic-physics\u002Fquantum-hydrogen-atom\u002Frydberg-atoms","Rydberg Atoms","A Rydberg atom is an atom excited to a very high principal quantum number, and every hydrogenic property becomes exaggerated by a power of n. Size grows as n², binding falls as n⁻², radiative lifetime lengthens as n³, and the static polarizability explodes as n⁷. The levels crowd toward the ionization limit, and the enormous dipole interaction between two Rydberg atoms produces the blockade that underlies neutral-atom quantum computing.\n",{"path":6857,"title":6858,"module":6859,"summary":6860},"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Frelativistic-kinetic-correction","The Relativistic Kinetic-Energy Correction","Fine Structure and the Dirac Atom","The Bohr energies treat the electron as slowly moving, but its speed is of order αc, so the kinetic energy needs a relativistic correction. Expanding √(p²c²+m²c⁴) to order (v\u002Fc)² produces the perturbation −p⁴\u002F8m³c², whose first-order shift on a hydrogenic state is evaluated with the trick p²=2m(E−V). The result depends on n and ℓ, is smaller than the gross structure by α²≈5×10⁻⁵, and is one of the three pieces that combine into the fine-structure formula.\n",{"path":6862,"title":6863,"module":6859,"summary":6864},"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Fspin-orbit-thomas-precession","Spin-Orbit Coupling and Thomas Precession","In the electron's rest frame the nucleus orbits it, and the resulting current produces a magnetic field that couples to the electron's spin moment. The interaction is ξ(r) L·S, with ξ built from the Coulomb potential and the radial expectation ⟨1\u002Fr³⟩. A relativistic subtlety, Thomas precession, halves the naive coefficient because the electron's rest frame is accelerating. The result splits each ℓ≥1 level into a j=ℓ±½ doublet and makes (n, ℓ, j, mⱼ) the good quantum numbers.\n",{"path":6866,"title":6867,"module":6859,"summary":6868},"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Fdarwin-term-fine-structure-formula","The Darwin Term and the Fine-Structure Formula","The third fine-structure correction, the Darwin term, is a contact interaction proportional to ∇²V that acts only on s-states, physically a smearing of the electron over a Compton wavelength. Adding the relativistic, spin-orbit, and Darwin shifts, the ℓ-dependence cancels and the total collapses to a formula in n and j alone. The n=2 shell splits into 2S₁\u002F₂, 2P₁\u002F₂, 2P₃\u002F₂, with the two j=½ levels exactly degenerate, a coincidence the Dirac theory explains.\n",{"path":6870,"title":6871,"module":6859,"summary":6872},"\u002Fatomic-physics\u002Ffine-structure-and-the-dirac-atom\u002Fdirac-equation-hydrogen","The Dirac Equation for Hydrogen","The fine-structure formula was assembled from three perturbations; the Dirac equation produces it in one stroke and exactly. A first-order relativistic wave equation forces a four-component spinor, from which spin s=½, the g-factor of 2, the spin-orbit term, and antiparticles all emerge automatically. Its exact Coulomb spectrum depends only on n and j, and expanding in Zα reproduces the perturbative result, including the 2S₁\u002F₂–2P₁\u002F₂ degeneracy that sets up the Lamb shift.\n",{"path":6874,"title":6875,"module":6876,"summary":6877},"\u002Fatomic-physics\u002Fqed-corrections-and-hyperfine-structure\u002Flamb-shift-qed","The Lamb Shift and QED Radiative Corrections","QED Corrections and Hyperfine Structure","The Dirac equation makes the 2S₁\u002F₂ and 2P₁\u002F₂ levels of hydrogen exactly degenerate. Lamb and Retherford measured a splitting of about 1058 MHz that the Dirac theory cannot produce. The gap comes from the electron's coupling to the quantized electromagnetic field: self-energy, vacuum polarization, and the anomalous magnetic moment. Welton's vacuum-fluctuation estimate reproduces the size and shows why the effect lands almost entirely on s-states, and the same radiative corrections make hydrogen the most stringent test of QED.\n",{"path":6879,"title":6880,"module":6876,"summary":6881},"\u002Fatomic-physics\u002Fqed-corrections-and-hyperfine-structure\u002Fhyperfine-structure-21cm","Hyperfine Structure and the 21 cm Line","The proton carries a magnetic moment, and it interacts with the magnetic field the electron produces at the nucleus. For s-states that interaction is the Fermi contact term, proportional to the electron density at the origin and to the dot product of the nuclear and electronic spins. Coupling I and J into F = I + J splits each level by a Landé interval rule; in hydrogen's ground state it produces the F = 0\u002FF = 1 doublet whose 1420 MHz, 21 cm transition maps neutral hydrogen across the galaxy.\n",{"path":6883,"title":6884,"module":6876,"summary":6885},"\u002Fatomic-physics\u002Fqed-corrections-and-hyperfine-structure\u002Fnuclear-effects-isotope-shift","Nuclear Size, Moments, and Isotope Shifts","A real nucleus has a finite size, a mass that changes between isotopes, and, when its spin is at least one, an electric quadrupole moment. Each leaves a fingerprint in the atomic spectrum: the volume shift from s-electrons sampling the charge distribution, the mass and field isotope shifts that separate on a King plot, the quadrupole interaction that breaks the Landé interval rule, and the hyperfine anomaly from the magnetization distribution. Atomic spectroscopy reads nuclear properties out of these shifts.\n",{"path":6887,"title":6888,"module":6889,"summary":6890},"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fperiodic-table-atomic-spectra","The Periodic Table and Atomic Spectra","Many-Electron Atoms","Identical electrons demand antisymmetric wave functions, which is the Pauli exclusion principle: no two electrons share all four quantum numbers. Filling shells in order of increasing energy — shifted by penetration and shielding — builds the periodic table and its recurring ionization pattern. Selection rules govern optical spectra, and an external field splits lines by the Zeeman effect.\n",{"path":6892,"title":6893,"module":6889,"summary":6894},"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fcentral-field-self-consistent","The Central-Field Approximation and the Self-Consistent Field","The N-electron Hamiltonian does not separate because every pair of electrons repels. The central-field approximation replaces that pairwise repulsion with an averaged spherical potential each electron feels, restoring hydrogen-like orbitals labelled by n and ℓ. The Thomas-Fermi statistical model fixes the shape of the screened charge from Fermi-gas thermodynamics; the Hartree self-consistent field determines it exactly by iterating orbitals against the potential they generate until the two agree.\n",{"path":6896,"title":6897,"module":6889,"summary":6898},"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fidentical-particles-hartree-fock","Exchange, Slater Determinants, and Hartree-Fock","A product wave function ignores that electrons are identical fermions. Enforcing antisymmetry writes the state as a Slater determinant, which vanishes whenever two electrons share a spin-orbital — the exclusion principle made algebraic. The energy of a determinant carries a new term with no classical analogue, the exchange integral, nonzero only for parallel spins; it lowers the energy of aligned electrons and carves a Fermi hole around each one. Adding the exchange operator to the mean field gives the Hartree-Fock equations, and what they still miss defines the correlation energy.\n",{"path":6900,"title":6901,"module":6889,"summary":6902},"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fhelium-two-electron-atom","Helium: the Prototype Two-Electron Atom","Helium is the smallest atom the Schrödinger equation cannot solve exactly, and the smallest that shows every many-electron effect. Ignoring the electron repulsion overbinds the ground state by 30 eV; first-order perturbation theory and a one-parameter variational calculation with an effective charge close most of the gap. The excited configurations split into para (singlet) and ortho (triplet) states separated by the exchange integral, with the triplet lower — and the absence of a 1s² triplet is the Pauli principle in its plainest form.\n",{"path":6904,"title":6905,"module":6889,"summary":6906},"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fls-jj-coupling-term-symbols","LS and jj Coupling; Term Symbols","A configuration is not a single energy level. The residual electrostatic repulsion and the spin-orbit interaction split it, and which one dominates fixes the coupling scheme. In light atoms the electrostatic term wins: orbital and spin angular momenta couple separately into L and S, then into J, giving Russell- Saunders term symbols. In heavy atoms spin-orbit wins and each electron's j forms first. The Pauli principle prunes the allowed terms of equivalent electrons, the Landé interval rule spaces the fine-structure multiplet, and the scheme crosses over from LS to jj down a column.\n",{"path":6908,"title":6909,"module":6889,"summary":6910},"\u002Fatomic-physics\u002Fmany-electron-atoms\u002Fhund-rules-ground-terms","Hund's Rules and Ground-State Terms","A configuration allows several terms; Hund's three rules pick the ground one. Maximize the spin S first, then the orbital L, then set J to |L−S| for a less-than-half shell and L+S for a more-than-half shell. The first two rules come from exchange lowering the energy of apart-kept electrons; the third comes from the sign of the spin-orbit coupling, which flips as a shell passes half-filling and turns the multiplet from normal to inverted. Worked ground terms for carbon, nitrogen, oxygen, and iron show the rules in action.\n",{"path":6912,"title":6913,"module":6914,"summary":6915},"\u002Fatomic-physics\u002Fatoms-in-external-fields\u002Fzeeman-effect","The Zeeman Effect","Atoms in External Fields","A magnetic field couples to the atom through its magnetic moment, splitting each level into equally spaced sublevels labelled by the projection of the total angular momentum. When spin is present the spacing is not the classical one: it carries the Landé g-factor, a projection of the spin and orbital moments onto the total angular momentum. We derive the weak-field Hamiltonian from minimal coupling, evaluate the shift with the projection theorem, and read off the polarization of the emitted components.\n",{"path":6917,"title":6918,"module":6914,"summary":6919},"\u002Fatomic-physics\u002Fatoms-in-external-fields\u002Fpaschen-back-intermediate","The Paschen-Back and Intermediate-Field Regimes","When the magnetic interaction grows past the fine-structure coupling, spin and orbital angular momentum decouple and precess independently about the field. The anomalous Zeeman pattern reverts to a simple triplet, the Paschen-Back effect. Between the two limits neither coupling dominates and the level positions follow from diagonalizing the combined spin-orbit and Zeeman Hamiltonian. We build the two-by-two problem for a single valence electron, solve it in closed form, and show both limits emerge from one expression.\n",{"path":6921,"title":6922,"module":6914,"summary":6923},"\u002Fatomic-physics\u002Fatoms-in-external-fields\u002Fstark-effect-polarizability","The Stark Effect and Field Ionization","An electric field shifts atomic levels by coupling to the electron's position. Parity forbids a first-order shift for a non-degenerate state, so most atoms respond only at second order through their polarizability, a quadratic Stark shift. Hydrogen is the exception: its accidental degeneracy admits a permanent dipole and a linear shift, cleanest in parabolic coordinates. At large fields the Coulomb well develops a saddle, and Rydberg states field-ionize at a threshold that falls as the fourth power of the principal quantum number.\n",{"path":6925,"title":6926,"module":6927,"summary":6928},"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Ftime-dependent-perturbation-golden-rule","Time-Dependent Perturbation Theory and the Golden Rule","Radiative Transitions and Spectral Lines","An atom in a weak oscillating field makes transitions between its stationary states. First-order time-dependent perturbation theory gives the transition amplitude as a Fourier component of the perturbation at the Bohr frequency, and the resulting probability is a sinc-squared resonance that sharpens as the field acts longer. For a two-level system the same coupling produces Rabi oscillations; for a transition into a continuum the long-time limit collapses the sinc-squared into a delta function and yields Fermi's golden rule, a constant transition rate set by the coupling strength and the density of final states.\n",{"path":6930,"title":6931,"module":6927,"summary":6932},"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Fdipole-approximation-einstein-coefficients","The Dipole Approximation and Einstein Coefficients","The coupling between an atom and light is the interaction of the electron with the electromagnetic field. Because an optical wavelength dwarfs the atom, the spatial variation of the field across the atom can be dropped, leaving the electric-dipole interaction and its matrix element. That matrix element defines the oscillator strength, which obeys the Thomas-Reiche-Kuhn sum rule. Einstein's three rate coefficients (absorption, stimulated emission, spontaneous emission) follow from detailed balance with thermal radiation, fixing the ratio of spontaneous to stimulated rates and its steep growth with frequency.\n",{"path":6934,"title":6935,"module":6927,"summary":6936},"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Fselection-rules-forbidden-transitions","Selection Rules and Forbidden Transitions","The dipole matrix element vanishes for most pairs of states, and the pattern of which survive is the set of selection rules. Parity forces the orbital angular momentum to change by one; the angular integral of three spherical harmonics restricts the magnetic quantum number to change by zero or one; the photon's spin restricts the total angular momentum. When the dipole element vanishes, higher multipoles (magnetic dipole and electric quadrupole) can still drive the transition at rates smaller by powers of the fine-structure constant, and states with no allowed decay become metastable.\n",{"path":6938,"title":6939,"module":6927,"summary":6940},"\u002Fatomic-physics\u002Fradiative-transitions-and-line-shapes\u002Flifetimes-and-line-shapes","Lifetimes, Line Widths, and Line Shapes","A spectral line is never infinitely sharp. The finite lifetime of the excited state gives every line a natural Lorentzian width set by the total decay rate, the Fourier transform of an exponentially damped emission. Thermal motion adds a Gaussian Doppler width that usually dominates in a gas; collisions add a further Lorentzian pressure width; the observed profile is the Voigt convolution of the Gaussian and Lorentzian parts. Strong driving fields broaden the line further through saturation. Each mechanism has a distinct dependence on temperature, density, and intensity that lets it be identified and, where possible, removed.\n",{"path":6942,"title":6943,"module":6944,"summary":6945},"\u002Fatomic-physics\u002Flasers-and-spectroscopy\u002Flaser-principles","Population Inversion, Gain, and the Laser","Lasers and Spectroscopy","A laser is an optical amplifier placed inside a resonant cavity. Amplification requires that stimulated emission outrun absorption, which requires more atoms in the upper level than the lower one — a population inversion that the Einstein relations forbid in thermal equilibrium and that no two-level pump can produce. Three- and four-level schemes reach it by routing atoms through auxiliary states. The gain coefficient sets how strongly a weak beam grows, the cavity fixes the threshold and selects a comb of longitudinal modes, and gain saturation clamps the steady-state inversion at its threshold value.\n",{"path":6947,"title":6948,"module":6944,"summary":6949},"\u002Fatomic-physics\u002Flasers-and-spectroscopy\u002Fspectroscopy-techniques","Spectroscopic Techniques and Frequency Combs","A tunable laser turns spectroscopy from photographing a spectrum into interrogating a single transition, but at room temperature the Doppler width buries the natural linewidth under a thousandfold-broader Gaussian. Saturated absorption and two-photon spectroscopy defeat the first-order Doppler shift by selecting the zero-velocity class or cancelling the shift between counter-propagating photons, recovering natural-width features. Laser-induced fluorescence pushes sensitivity to single atoms, and the optical frequency comb converts an optical frequency into a countable radio-frequency beat, giving absolute frequency measurement across the visible spectrum.\n",{"path":6951,"title":6952,"module":6944,"summary":6953},"\u002Fatomic-physics\u002Flasers-and-spectroscopy\u002Fline-catalog-nist-asd","Reading Real Spectra with the NIST Database","Every quantity computed in this course — energy levels, transition frequencies, oscillator strengths, lifetimes — is tabulated for real atoms in the NIST Atomic Spectra Database. This lesson reads that data as physics: how levels are labelled by term symbols and energies in wavenumbers, how a transition list encodes wavelength, Einstein coefficient, and line strength, how a Grotrian diagram is reconstructed from the tables, and how a measured spectrum is matched to catalog lines. The residual between computed and tabulated positions is the running score of atomic theory.\n",{"path":6955,"title":6956,"module":6957,"summary":6958},"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Flaser-cooling-doppler","Laser Cooling and Optical Molasses","Modern Atomic Physics","A near-resonant laser beam pushes an atom because every absorbed photon delivers one unit of momentum and the subsequent spontaneous emission averages to zero. Two counter-propagating red-detuned beams turn that push into friction: the Doppler shift brings a moving atom closer to resonance with the beam it moves against, so the net force opposes the velocity. Six beams give optical molasses in three dimensions. The random recoil of spontaneous emission heats against the friction, and the balance sets the Doppler cooling limit. Adding a magnetic-field gradient makes the force position-dependent as well, giving the magneto-optical trap.\n",{"path":6960,"title":6961,"module":6957,"summary":6962},"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Fsub-doppler-trapping","Sub-Doppler Cooling and Atom Traps","Optical molasses cools multilevel atoms below the Doppler limit. A polarization gradient plus optical pumping makes an atom repeatedly climb a light-shift hill and be pumped to the valley, losing kinetic energy each cycle — Sisyphus cooling. The floor is the recoil limit, one photon momentum of residual motion. Below it, cooling must avoid scattering photons: conservative magnetic and optical-dipole traps hold the atoms while forced evaporation removes the hot tail, driving the phase-space density up toward quantum degeneracy.\n",{"path":6964,"title":6965,"module":6957,"summary":6966},"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Fbose-einstein-condensation","Bose-Einstein Condensation of Atomic Gases","Below a critical temperature a gas of identical bosons places a macroscopic fraction of its atoms in the single lowest-energy state. The transition occurs when the thermal de Broglie wavelength grows to the interparticle spacing, so the phase- space density reaches order unity. The critical temperature follows from the Bose-Einstein distribution and the density of states, the condensate fraction grows as one minus (T\u002FTc) to the three-halves, and the condensate reveals itself in time-of-flight as a sharp bimodal peak in the momentum distribution. The 1995 rubidium and sodium experiments realized it in dilute trapped gases.\n",{"path":6968,"title":6969,"module":6957,"summary":6970},"\u002Fatomic-physics\u002Fmodern-atomic-physics\u002Foptical-clocks-precision","Optical Atomic Clocks and Precision Measurement","An atomic clock counts the oscillations of a field locked to an atomic transition. The cesium microwave standard defines the second through the 9.19 GHz ground-state hyperfine transition, interrogated by Ramsey's separated-oscillatory-field method whose fringe width is set by the free-precession time. Optical clocks replace the microwave transition with an optical one five orders of magnitude higher in frequency, raising the quality factor and the fractional stability in proportion. Lattice and single-ion clocks reach fractional uncertainties near ten-to-the-minus- eighteen by trapping the atoms at a magic wavelength that cancels the light shift, and at that level they measure the gravitational redshift over centimetres of height.\n",{"path":6972,"title":6973,"module":6,"summary":6},"\u002Fatomic-physics","Atomic Physics",{"path":6975,"title":6976,"module":6,"summary":6},"\u002Fdatabases","Databases",{"path":6978,"title":6979,"module":3628,"summary":6980},"\u002Fcategory-theory\u002Ffoundations\u002Fwhat-is-a-category","Categories, Objects, and Arrows","A category is objects, arrows between them, a rule for composing arrows, and an identity arrow on every object, subject to associativity and the unit laws. The axioms mention no elements: arrows need not be functions, and an object is known only through the arrows into and out of it. Isomorphism, commutative diagrams, duality, and the terminal object are the first consequences.\n",{"path":6982,"title":6983,"module":3628,"summary":6984},"\u002Fcategory-theory\u002Ffoundations\u002Fexamples-of-categories","A Zoo of Categories","The axioms admit two very different kinds of model: large categories of structured sets and their structure-preserving maps (Set, Mon, Grp, Top, Vect), and small categories that are themselves single algebraic objects — a monoid as a one-object category, a poset as a thin category. The awkward cases Rel and Pfn have sets as objects but relations and partial functions as arrows, and a typed programming language presents its types and programs as a category.\n",{"path":6986,"title":6987,"module":3628,"summary":6988},"\u002Fcategory-theory\u002Ffoundations\u002Fspecial-morphisms","Isomorphisms, Monos, and Epis","Injectivity and surjectivity mention elements, so a general category re-expresses them by cancellation: monomorphisms cancel on the left, epimorphisms on the right. Sections and retractions are the split versions with an explicit one-sided inverse. Mono plus epi does not force an isomorphism, and subobjects are equivalence classes of monos into a fixed object.\n",{"path":6990,"title":6991,"module":3628,"summary":6992},"\u002Fcategory-theory\u002Ffoundations\u002Ffunctors","Functors: Maps Between Categories","A functor sends objects to objects and arrows to arrows while preserving composition and identities. Covariant and contravariant functors, the standard stock (forgetful, free, hom, and powerset), and the classification by faithfulness, fullness, and essential surjectivity all follow. Functors compose, so categories and functors form a category themselves.\n",{"path":6994,"title":6995,"module":3628,"summary":6996},"\u002Fcategory-theory\u002Ffoundations\u002Fnatural-transformations","Natural Transformations and Functor Categories","A natural transformation is a map between two parallel functors: one component arrow per object, subject to a commuting square for every arrow of the source. Naturality is verified for the determinant, the double dual, and list operations; functors and natural transformations form the functor category [C, D]; and vertical and horizontal composition satisfy the Godement interchange law.\n",{"path":6998,"title":6999,"module":3628,"summary":7000},"\u002Fcategory-theory\u002Ffoundations\u002Fsize-and-set-theory","Size: Small, Large, Locally Small","The objects of Set do not form a set, and pretending otherwise reproduces the classical paradoxes. Classes make the small\u002Flarge distinction precise, with locally small and essentially small as the intermediate notions. Cantor's theorem shows Set and its algebraic relatives are large, and the function-based axiomatization of sets is the one category theory prefers to ZFC.\n",{"path":7002,"title":7003,"module":7004,"summary":7005},"\u002Fcategory-theory\u002Funiversal-properties\u002Funiversal-properties","Universal Properties, Initial and Terminal Objects","Universal Properties and Basic Constructions","A universal property characterizes an object by a for-all\u002Fexists-unique condition on the arrows into or out of it, and any two objects satisfying the same property are isomorphic by a unique isomorphism. Initial and terminal objects are the simplest cases; the free vector space, the discrete topology, and the ring of integers show the pattern at work.\n",{"path":7007,"title":7008,"module":7004,"summary":7009},"\u002Fcategory-theory\u002Funiversal-properties\u002Fproducts-and-coproducts","Products and Coproducts","The product of two objects is a wedge of projections through which every other wedge factors uniquely; the coproduct is the dual, built from injections. In Set these are the cartesian product and the disjoint union, in a poset the meet and join, and in abelian groups the two coincide. The mediating-arrow discipline established here is the template for all limits.\n",{"path":7011,"title":7012,"module":7004,"summary":7013},"\u002Fcategory-theory\u002Funiversal-properties\u002Fconstructions-on-categories","Opposite, Product, Slice, and Comma Categories","Categories are themselves mathematical structures, and the standard algebraic constructions apply: opposites, products, subcategories, slices, and the comma category that subsumes them. The opposite category yields the duality principle, halving the subject's proofs; slice and comma categories repackage every universal property as an initial or terminal object.\n",{"path":7015,"title":7016,"module":7017,"summary":7018},"\u002Fcategory-theory\u002Frepresentables-yoneda\u002Frepresentable-functors","Hom-Functors and Representables","Representables and the Yoneda Lemma","Fixing an object A of a locally small category produces a set-valued functor, the hom-functor A(A,-), that records every map out of A. A functor is representable when it is naturally isomorphic to such a hom-functor. We define the covariant and contravariant hom-functors, collect the standard representables (identity, forgetful, powerset), and read maps as generalized elements of varying shape.\n",{"path":7020,"title":7021,"module":7017,"summary":7022},"\u002Fcategory-theory\u002Frepresentables-yoneda\u002Fyoneda-lemma","The Yoneda Lemma","The Yoneda lemma computes the natural transformations out of a representable presheaf: they form a set in natural bijection with X(A). The proof fixes a single degree of freedom, the image of the identity arrow, and shows naturality forces everything else. We prove the bijection, verify naturality in both variables, and read off that a natural transformation out of a representable is just one element.\n",{"path":7024,"title":7025,"module":7017,"summary":7026},"\u002Fcategory-theory\u002Frepresentables-yoneda\u002Fyoneda-consequences","The Yoneda Embedding and Its Uses","Three corollaries turn the Yoneda lemma into working machinery. A representation of a presheaf is the same thing as a universal element; the Yoneda embedding of a category into its presheaf category is full and faithful; and two objects are isomorphic exactly when their representables are. Together they justify constructing arrows by constructing natural transformations between hom-functors, and they contain Cayley's theorem as the one-object case.\n",{"path":7028,"title":7029,"module":7030,"summary":7031},"\u002Fcategory-theory\u002Flimits-colimits\u002Flimits","Cones and Limits","Limits and Colimits","A diagram is a functor from a small shape category; a cone over it is an object with compatible legs to every node; and a limit is the terminal cone, the one every other cone factors through uniquely. Products and terminal objects reappear as limits over particular shapes, and the whole construction is unique up to a single isomorphism.\n",{"path":7033,"title":7034,"module":7030,"summary":7035},"\u002Fcategory-theory\u002Flimits-colimits\u002Fproducts-equalizers-pullbacks","Equalizers and Pullbacks","The equalizer of a parallel pair is the universal arrow that makes the two composites agree; the pullback of a cospan is the universal commutative square. In Set they are solution sets and fibered products, every equalizer is monic, monics are stable under pullback, and products plus equalizers together generate all limits.\n",{"path":7037,"title":7038,"module":7030,"summary":7039},"\u002Fcategory-theory\u002Flimits-colimits\u002Fcolimits","Colimits: Coproducts, Coequalizers, Pushouts","Colimits are limits in the opposite category: cocones replace cones, and the universal cocone is initial rather than terminal. Coproducts glue objects side by side, coequalizers impose relations and produce quotients, pushouts glue along a shared part, and in Set every colimit is a quotient of a disjoint union. Directed colimits admit a clean elementwise description.\n",{"path":7041,"title":7042,"module":7030,"summary":7043},"\u002Fcategory-theory\u002Flimits-colimits\u002Fcomputing-limits","Computing Limits in Concrete Categories","In Set the limit of any diagram is the set of threads: choice functions through the nodes that commute with every edge. In Pos, Mon, and Top the recipe is the same limit downstairs plus the unique structure that makes the projections structure-preserving — pointwise order, componentwise operations, the topology generated by the projections. The pattern is what \"the forgetful functor creates limits\" means concretely.\n",{"path":7045,"title":7046,"module":7030,"summary":7047},"\u002Fcategory-theory\u002Flimits-colimits\u002Flimits-and-functors","Preservation, Reflection, and Creation of Limits","A functor preserves limits if it sends limit cones to limit cones, reflects them if it recognizes them, and creates them if limits downstairs lift uniquely upstairs. Representable functors preserve all limits, forgetful functors from algebra create them, and limits in functor categories are computed pointwise, one evaluation at a time.\n",{"path":7049,"title":7050,"module":7051,"summary":7052},"\u002Fcategory-theory\u002Fadjunctions\u002Fadjunctions","Adjoint Functors via Hom-Set Bijections","Adjunctions","An adjunction is a natural bijection between two hom-sets: maps out of $F(A)$ in one category correspond to maps into $G(B)$ in the other. We give the definition, spell out the naturality axioms that make the correspondence compatible with composition, and work the flagship examples — free vector spaces, free groups, discrete and indiscrete topologies, and currying.\n",{"path":7054,"title":7055,"module":7051,"summary":7056},"\u002Fcategory-theory\u002Fadjunctions\u002Funits-and-counits","Units, Counits, and the Triangle Identities","The whole hom-set bijection of an adjunction is generated by two natural transformations: the unit, obtained by transposing identity maps on one side, and the counit, by transposing them on the other. Two triangle identities are all they must satisfy, and any pair satisfying them determines a unique adjunction. The same correspondence specializes to order-preserving maps between posets and to free constructions.\n",{"path":7058,"title":7059,"module":7051,"summary":7060},"\u002Fcategory-theory\u002Fadjunctions\u002Fadjunctions-via-universal-arrows","Adjunctions from Universal Arrows","The unit component at a single object is an initial object of a comma category, and this universal property alone rebuilds the whole adjunction. A functor has a left adjoint exactly when every object admits such a universal arrow, and the left adjoint is assembled from them one object at a time. We prove the equivalence of all three formulations of adjointness.\n",{"path":7062,"title":7063,"module":7051,"summary":7064},"\u002Fcategory-theory\u002Fadjunctions\u002Ffree-forgetful-adjunctions","Free Constructions and Free–Forgetful Adjunctions","Free monoids, free groups, and free vector spaces are left adjoints to forgetful functors, and the universal mapping property is all one needs to prove it. Some forgetful functors also have right adjoints (co-free constructions like the indiscrete topology), producing three-functor chains. Contravariant adjunctions, symmetric in their two functors, close the lesson with the pattern behind duality and representation theorems.\n",{"path":7066,"title":7067,"module":7068,"summary":7069},"\u002Fcategory-theory\u002Fadjoints-limits\u002Flimits-via-adjoints","Limits as Adjoints and as Representables","Adjoints, Representables, and Limits Together","A cone on a diagram is a natural transformation from a constant diagram, so a limit is a representation of the cone functor and, equivalently, a value of the right adjoint to the diagonal functor. We prove both rephrasings, derive uniqueness and functoriality of limits from them, and record the dual statement that a colimit is the left adjoint to the diagonal.\n",{"path":7071,"title":7072,"module":7068,"summary":7073},"\u002Fcategory-theory\u002Fadjoints-limits\u002Fpresheaf-limits-colimits","Limits and Colimits of Presheaves","Representables preserve limits, and limits in a functor category are computed one object at a time, so a presheaf category is complete and cocomplete with all its structure inherited pointwise from Set. The Yoneda embedding then preserves limits but not colimits, and the density theorem repairs the colimit side: every presheaf is a canonical colimit of representables.\n",{"path":7075,"title":7076,"module":7068,"summary":7077},"\u002Fcategory-theory\u002Fadjoints-limits\u002Fadjoints-preserve-limits","Right Adjoints Preserve Limits (RAPL)","A functor with a left adjoint preserves every limit that exists, and dually a functor with a right adjoint preserves colimits. The proof is a four-line chain of natural isomorphisms through the adjunction and the continuity of representables. The theorem yields product-and-exponential arithmetic in Set, another proof that limits commute with limits, and a standard test for proving that a functor has no adjoint.\n",{"path":7079,"title":7080,"module":7068,"summary":7081},"\u002Fcategory-theory\u002Fadjoints-limits\u002Fadjoint-functor-theorem","The Adjoint Functor Theorem","RAPL makes limit preservation necessary for having a left adjoint; the adjoint functor theorems identify when it is sufficient. For ordered sets no extra hypothesis is needed. In general the candidate adjoint is a limit over a comma category that may be large, and the general adjoint functor theorem tames it with a weakly initial set. We prove GAFT in full and apply it to free groups and, through the special adjoint functor theorem, the Stone–Čech compactification.\n",{"path":7083,"title":7084,"module":7085,"summary":7086},"\u002Fcategory-theory\u002Fmonads-algebras\u002Fmonads","Monads from Adjunctions","Monads and Algebras","A monad on a category is an endofunctor equipped with a unit and a multiplication satisfying associativity and unit laws — the data of a monoid, written internally to the category of endofunctors. Every adjunction induces one, and the list, exception, and state constructions that model computational effects are all monads on Set.\n",{"path":7088,"title":7089,"module":7085,"summary":7090},"\u002Fcategory-theory\u002Fmonads-algebras\u002Falgebras-eilenberg-moore","Algebras for a Monad","An algebra for a monad is an object with a structure map that interacts correctly with the unit and multiplication. The algebras form the Eilenberg–Moore category, whose free–forgetful adjunction induces the monad back; a comparison functor relates any other inducing adjunction to it, and for the list monad the algebras are exactly monoids.\n",{"path":7092,"title":7093,"module":7085,"summary":7094},"\u002Fcategory-theory\u002Fmonads-algebras\u002Fkleisli-and-programming","The Kleisli Category and Monads in Programming","The Kleisli category of a monad has the same objects as the base but takes arrows A to TB, composed by mapping and flattening. These arrows are effectful programs, Kleisli composition is the bind of functional programming, and the Kleisli adjunction is the initial resolution of the monad, with Eilenberg–Moore at the terminal end.\n",{"path":7096,"title":7097,"module":7085,"summary":7098},"\u002Fcategory-theory\u002Fmonads-algebras\u002Falgebras-for-endofunctors","Algebras for an Endofunctor and Recursion","Dropping the monad laws leaves algebras for a bare endofunctor, whose initial objects are the least fixed points of the functor by Lambek's lemma. The natural numbers, lists, and trees are initial algebras; the unique map out of an initial algebra is the fold of functional programming; and the Smyth–Plotkin fixed-point technique builds Scott domains the same way.\n",{"path":7100,"title":7101,"module":7102,"summary":7103},"\u002Fcategory-theory\u002Fcartesian-closed-lambda\u002Fcartesian-closed-categories","Cartesian Closed Categories","Cartesian Closed Categories and Typed Lambda Calculus","A cartesian closed category has a terminal object, binary products, and for every pair of objects an exponential object that internalizes the hom-set as an object of the category. The defining data is an evaluation arrow and a currying operation, packaged by the adjunction between product-with-A and exponential-by-A. Set, Boolean and Heyting algebras, functor categories, and Cat are all cartesian closed.\n",{"path":7105,"title":7106,"module":7102,"summary":7107},"\u002Fcategory-theory\u002Fcartesian-closed-lambda\u002Flambda-calculus-correspondence","Typed Lambda Calculus and CCCs","The typed lambda calculus and the cartesian closed category are two presentations of the same theory. Types become objects, terms with one free variable become arrows, product types become products, and function types become exponentials, with abstraction matching currying and application matching evaluation. Building the category of a lambda theory and the internal language of a category are mutually inverse up to equivalence.\n",{"path":7109,"title":7110,"module":7102,"summary":7111},"\u002Fcategory-theory\u002Fcartesian-closed-lambda\u002Ffixed-points-and-recursion","Fixed Points in Cartesian Closed Categories","The untyped lambda calculus has a fixed-point combinator; the typed calculus cannot, and Lawvere's fixed-point theorem explains why: any point-surjection onto an exponential forces every endomap to have a fixed point, which is the abstract form of Cantor's diagonal argument. Recursion is recovered instead by restricting to omega-complete partially ordered objects, where every continuous endomap has a least fixed point built by iterating from bottom. This gives While loops a semantics.\n",{"path":7113,"title":7114,"module":6,"summary":6},"\u002Fcategory-theory","Category Theory",{"path":7116,"title":5758,"module":7117,"summary":7118},"\u002Fdeep-learning\u002Fmathematical-background\u002Flinear-algebra-for-deep-learning","Mathematical Background","Every quantity a network touches is a tensor, and every layer is a matrix acting on one. This lesson compiles the linear algebra deep learning actually uses: products and norms, the system $Ax=b$ and when it is solvable, the two decompositions (eigen and SVD) that diagonalize a transformation, and the pseudoinverse that solves what cannot be solved exactly. It then derives PCA as the worked example that ties it all together.\n",{"path":7120,"title":7121,"module":7117,"summary":7122},"\u002Fdeep-learning\u002Fmathematical-background\u002Fprobability-and-information-theory","Probability & Information Theory","This lesson assembles the probabilistic vocabulary a network is trained in (random variables, densities, the chain rule, expectation and covariance, the handful of distributions that recur everywhere) and then the information theory that turns a probabilistic model into a loss: self-information, entropy, and the KL divergence whose asymmetry is the cross-entropy objective itself.\n",{"path":7124,"title":7125,"module":7117,"summary":7126},"\u002Fdeep-learning\u002Fmathematical-background\u002Fnumerical-computation","Numerical Computation","Machine learning runs on finite-precision arithmetic, where every number is approximated and every operation rounds. This lesson sets the numerical ground rules: overflow and underflow and the standard stabilizations, the condition number that measures how much a problem amplifies error, and the gradient-based optimization (first and second order, constrained and unconstrained) that every training loop runs.\n",{"path":7128,"title":5117,"module":7117,"summary":7129},"\u002Fdeep-learning\u002Fmathematical-background\u002Fcalculus","This lesson assembles the differential calculus used in training networks: the gradient and directional derivative, the Jacobian and Hessian, and the chain rule in scalar, vector, and matrix form. From the chain rule it derives back-propagation as a single sweep over the computational graph, tabulates the matrix-calculus identities that recur in layer gradients, reads optimization off a second-order Taylor expansion, and ends with why reverse-mode automatic differentiation is the algorithm every framework runs.\n",{"path":7131,"title":7132,"module":3628,"summary":7133},"\u002Fdeep-learning\u002Ffoundations\u002Fwhat-is-deep-learning","What Is Deep Learning?","Deep learning is representation learning by composition: stack simple differentiable layers, define a loss, and let gradient descent discover the features a human would otherwise have to engineer by hand. We set up the whole vocabulary (model, loss, optimizer, data), the training loop that ties them together, and the three reasons the approach became practical.\n",{"path":7135,"title":7136,"module":3628,"summary":7137},"\u002Fdeep-learning\u002Ffoundations\u002Fmachine-learning-refresher","A Machine-Learning Refresher","The statistical framework the networks live in: data drawn from an unknown distribution, a loss to minimize, and the central question of generalization: will it work on data we have not seen? We set up empirical risk, capacity, the bias–variance tradeoff, and maximum likelihood.\n",{"path":7139,"title":7140,"module":3628,"summary":7141},"\u002Fdeep-learning\u002Ffoundations\u002Flinear-models-and-the-perceptron","Linear Models & the Perceptron","The simplest learners (linear regression, logistic regression, the perceptron) already contain the whole template: a weighted sum, a loss, a gradient step. They also fail on the XOR problem, which no linear model can solve — the limitation that motivates deep learning.\n",{"path":7143,"title":7144,"module":7145,"summary":7146},"\u002Fdeep-learning\u002Fneural-networks\u002Fthe-multilayer-perceptron","The Multilayer Perceptron","Neural Networks","Stacking linear layers with a nonlinearity between them removes the limitation that stopped the perceptron. We build the multilayer perceptron in explicit matrix form (the forward pass, its dimensions, a worked XOR network with concrete weights) and prove why the nonlinearity is essential: without it the deepest stack collapses to a single hyperplane.\n",{"path":7148,"title":7149,"module":7145,"summary":7150},"\u002Fdeep-learning\u002Fneural-networks\u002Factivation-functions","Activation Functions","The activation is the only nonlinear part of a layer, and the reason depth adds expressive power. We catalog the standard hidden units (sigmoid, tanh, ReLU and its descendants, plus GELU, softplus, swish and maxout), derive each unit's derivative in full, make the vanishing-gradient problem quantitative with the chain-rule product, work numeric examples, and explain why the saturating units gave way to ReLU and why ReLU's own dead-unit failure gave way to Leaky\u002FPReLU\u002FELU\u002FGELU.\n",{"path":7152,"title":7153,"module":7145,"summary":7154},"\u002Fdeep-learning\u002Fneural-networks\u002Funiversal-approximation","Universal Approximation","One hidden layer with a non-polynomial activation can approximate any continuous function on a compact set to arbitrary accuracy: the universal approximation theorem. We prove it constructively (two sigmoids make a bump; sums of bumps make any curve), then show the limitation: existence is not efficiency. Depth-separation results exhibit functions a deep net represents with $O(n)$ units that a shallow net needs $\\exp(n)$ units to match.\n",{"path":7156,"title":7157,"module":7145,"summary":7158},"\u002Fdeep-learning\u002Fneural-networks\u002Fbackpropagation","Backpropagation","Backpropagation is the chain rule run backward over a computational graph. We formalize the graph, derive the four backprop equations for an MLP, present the forward and backward passes as algorithms, and work a tiny two-layer net by hand with explicit numbers. The result: one scalar loss, reverse-mode autodiff, and a gradient for every parameter at twice the cost of a forward pass.\n",{"path":7160,"title":7161,"module":7145,"summary":7162},"\u002Fdeep-learning\u002Fneural-networks\u002Floss-functions-and-output-units","Loss Functions & Output Units","The last layer is where a network's hidden representation meets the task. Choosing an output unit and a loss is not two independent choices; maximum likelihood fixes the pair. We derive the standard couplings (linear\u002FMSE, sigmoid\u002FBCE, softmax\u002Fcross-entropy), show why softmax and cross-entropy were built to cancel into the residual $\\hat y - y$, and prove why squared error is the wrong loss for a saturating classifier.\n",{"path":7164,"title":7165,"module":7166,"summary":7167},"\u002Fdeep-learning\u002Foptimization\u002Fgradient-descent-and-sgd","Gradient Descent & SGD","Optimization","Training is descent on the empirical risk: step the parameters against the gradient. We derive the minibatch gradient as an unbiased estimator whose variance falls as $1\u002FB$, derive the learning-rate ceiling from the smoothness-stability bound $\\eta \u003C 2\u002FL$, and lay out the schedules (step, exponential, cosine, warmup) that anneal it over training.\n",{"path":7169,"title":7170,"module":7166,"summary":7171},"\u002Fdeep-learning\u002Foptimization\u002Fmomentum-and-adaptive-methods","Momentum & Adaptive Methods","Plain gradient descent zig-zags across ravines and moves slowly along flat valleys, because one global learning rate cannot suit a surface with wildly different curvature in different directions. Two fixes address the two problems: momentum accumulates a velocity that damps the oscillation and accelerates the drift, and adaptive methods give every parameter its own learning rate scaled by the history of its gradients. Adam fuses both, and is the default optimizer of modern deep learning.\n",{"path":7173,"title":7174,"module":7166,"summary":7175},"\u002Fdeep-learning\u002Foptimization\u002Finitialization","Weight Initialization","The initial weights determine whether training can succeed before the first gradient step. Initialize every weight equal and all hidden units compute the same function forever; initialize too small or too large and the signal vanishes or explodes as it crosses depth. A single variance condition, $n_{\\text{in}}\\mathrm{Var}(W)=1$, fixes both, and reading it off the forward and backward passes yields Xavier and He initialization directly.\n",{"path":7177,"title":7178,"module":7166,"summary":7179},"\u002Fdeep-learning\u002Foptimization\u002Fthe-optimization-landscape","The Optimization Landscape","The loss of a deep network is a non-convex surface in millions of dimensions, so local search carries no global guarantee, yet it works. We classify critical points by the eigenvalues of the Hessian, show that in high dimension nearly all of them are saddle points rather than bad local minima, and read off the practical terrain — plateaus, cliffs, ill-conditioning, and the sharp-versus-flat distinction that ties the geometry of a minimum to how well it generalizes.\n",{"path":7181,"title":7182,"module":7166,"summary":7183},"\u002Fdeep-learning\u002Foptimization\u002Fsecond-order-and-approximate-methods","Second-Order & Approximate Methods","Newton's method reads the curvature of the loss off its Hessian and jumps to the minimum of the local quadratic in a single step, rescaling away the ill-conditioning that slows first-order descent. We derive it, then explain the three obstacles that keep it out of deep learning: a $d \\times d$ Hessian for $d$ in the billions, an attraction to saddle points, and minibatch noise. The alternative is approximation (conjugate gradients, BFGS and L-BFGS, the natural gradient and Hessian-free methods), each buying some of Newton's curvature information without ever forming or inverting $H$.\n",{"path":7185,"title":7186,"module":7187,"summary":7188},"\u002Fdeep-learning\u002Fregularization\u002Fregularization-overview","Regularization Overview","Regularization","Regularization is any modification to a learning algorithm meant to lower test error at the possible expense of training error. We derive the bias–variance decomposition that explains why it helps, set up the two parameter-norm penalties, $L^2$ weight decay and $L^1$, derive their update rules and eigenbasis shrinkage, show geometrically why $L^1$ alone produces sparse weights (soft-thresholding), distinguish weight decay from loss-added $L^2$ under AdamW, and read both penalties through the two lenses that recur across the chapter: a norm-ball constraint via KKT, and a prior via MAP estimation.\n",{"path":7190,"title":7191,"module":7187,"summary":7192},"\u002Fdeep-learning\u002Fregularization\u002Fdropout-and-data-augmentation","Dropout & Data Augmentation","Two of the most effective regularizers add no penalty term at all; they perturb the computation instead. Dropout multiplies hidden units by a random Bernoulli mask, training an exponential ensemble of thinned subnetworks that share weights; inverted scaling collapses that ensemble into one cheap forward pass at test time. Data augmentation enlarges the training set with label-preserving transforms, injecting the invariances the task demands, and noise injection (input, weight, label smoothing, Mixup) generalizes the same idea into a continuous family.\n",{"path":7194,"title":7195,"module":7187,"summary":7196},"\u002Fdeep-learning\u002Fregularization\u002Fearly-stopping-and-parameter-sharing","Early Stopping & Parameter Sharing","Two cheap regularizers that cost no extra term in the loss. Early stopping treats training time itself as a hyperparameter (watch the validation curve, halt at its minimum, keep the best checkpoint), and for a quadratic objective it is provably equivalent to $L^2$ weight decay. Parameter sharing goes the other way: it constrains many weights to be _equal_, the prior behind every convolution and every recurrent step, and the reason a CNN has orders of magnitude fewer parameters than the dense net it replaces.\n",{"path":7198,"title":7199,"module":7187,"summary":7200},"\u002Fdeep-learning\u002Fregularization\u002Fnormalization","Normalization","Normalization layers standardize activations to zero mean and unit variance inside the network, then hand the model a learnable scale and shift to undo the constraint when it pays to. Batch normalization does this across the batch and must keep separate train-time and test-time statistics; layer, instance, and group norm change only the axes they average over. The result is faster, better-conditioned optimization and a free dose of regularizing batch noise.\n",{"path":7202,"title":7203,"module":7204,"summary":7205},"\u002Fdeep-learning\u002Farchitectures\u002Fconvolutional-networks","Convolutional Networks","Architectures","A convolutional network replaces the dense layer's all-to-all weight matrix with a small kernel slid across the input. Three structural commitments (sparse connectivity, parameter sharing, and translation equivariance) collapse the parameter count by orders of magnitude and bake the right prior for images directly into the architecture. We derive the convolution arithmetic, the output geometry, pooling, and the receptive field, then assemble the canonical stack.\n",{"path":7207,"title":7208,"module":7204,"summary":7209},"\u002Fdeep-learning\u002Farchitectures\u002Fcnn-architectures","CNN Architectures","Six landmark networks, each contributing exactly one idea: LeNet's conv-pool stack, AlexNet's ReLU-and-dropout scale, VGG's $3\\times3$ uniformity, Inception's multi-scale module, ResNet's residual skip, and DenseNet's dense connectivity. The common thread is the degradation problem (why plain deeper nets train worse, not just overfit) and the residual block that solved it by keeping a $+1$ path open for the gradient.\n",{"path":7211,"title":7212,"module":7204,"summary":7213},"\u002Fdeep-learning\u002Farchitectures\u002Frecurrent-networks","Recurrent Networks","A recurrent network folds a sequence into a fixed-size hidden state, reusing one set of weights at every time step, the architectural prior that the same rule applies wherever it lands in time. Unrolling the recurrence exposes a deep feed-forward graph; backpropagation through it sums gradient contributions across all steps and chains a product of Jacobians, and that product is why long-range gradients vanish or explode. That failure motivates gated architectures.\n",{"path":7215,"title":7216,"module":7204,"summary":7217},"\u002Fdeep-learning\u002Farchitectures\u002Flstm-and-gru","LSTM & GRU","A plain recurrent network propagates its hidden state through a repeated weight-matrix multiply, and the Jacobian product that results vanishes or explodes long before a useful gradient can reach the early steps. Gated RNNs fix this with an additive memory path: a cell state that is carried forward almost unchanged, past which the gradient flows along a near-identity highway. We derive that highway, give the full LSTM and GRU equations, and compare the two.\n",{"path":7219,"title":7220,"module":7204,"summary":7221},"\u002Fdeep-learning\u002Farchitectures\u002Fattention-and-transformers","Attention & Transformers","Attention replaces fixed wiring with content-based routing: every position reads from every other through a soft, learned dot-product lookup. We derive scaled dot-product attention and its $\\sqrt{d_k}$ correction, build it into multi-head self-attention, inject order with positional encodings, and stack the whole thing into the Transformer block that displaced recurrence and convolution alike.\n",{"path":7223,"title":7224,"module":7204,"summary":7225},"\u002Fdeep-learning\u002Farchitectures\u002Fthe-transformer-architecture","The Transformer Architecture","The Transformer is the architecture built around the attention mechanism. This first part assembles the full encoder–decoder of \"Attention Is All You Need\" — embeddings and positional encoding, stacked self-attention and feed-forward sublayers wrapped in residual connections and LayerNorm, masked decoding and cross-attention — works through causal masking and the three modern families (encoder-only, decoder-only, encoder–decoder), and accounts for where the parameters and the $O(n^2)$ compute actually go.\n",{"path":7227,"title":7228,"module":7204,"summary":7229},"\u002Fdeep-learning\u002Farchitectures\u002Ftransformers-in-practice","Transformers in Practice","The Transformer makes no assumption about what a token represents. This part follows the architecture out of language: image patches feed a plain encoder (the Vision Transformer), the decoder-only half scales into the GPT line of large language models, and one substrate covers translation, retrieval, and multimodal grounding. We work the ViT patch arithmetic and a GPT parameter count by hand, then close on the empirical scaling laws — power-law loss, the Chinchilla compute-optimal balance, and emergent behavior — that made scale the dominant lever.\n",{"path":7231,"title":7232,"module":7204,"summary":7233},"\u002Fdeep-learning\u002Farchitectures\u002Fgraph-neural-networks","Graph Neural Networks","A graph neural network learns on data with no grid and no canonical ordering: atoms in a molecule, users in a social network, road segments in a map. The unifying idea is message passing — each node repeatedly aggregates its neighbors' states and updates its own — built to respect the one symmetry graphs demand, permutation equivariance. We derive the message-passing framework, specialize it into GCN, GraphSAGE, GAT, and GIN, read off graph-level outputs, and bound what message passing can and cannot tell apart.\n",{"path":7235,"title":7236,"module":7204,"summary":7237},"\u002Fdeep-learning\u002Farchitectures\u002Fstate-space-models","State-Space Models and Mamba","A state-space model carries a continuous linear hidden state through a sequence, and that linearity buys two equivalent algorithms from one set of weights: a recurrence that runs in linear time with constant memory, and a global convolution that trains in parallel. Long-range memory comes from how the transition matrix is initialized (HiPPO) and parameterized (S4's diagonal-plus-low-rank form). Mamba breaks the convolution on purpose, making the parameters input-dependent so the model can select what to remember, recovered at speed by a hardware-aware parallel scan.\n",{"path":7239,"title":7240,"module":7241,"summary":7242},"\u002Fdeep-learning\u002Ftheory\u002Fgeneralization-theory","Generalization Theory","Theory & Frontiers","Classical learning theory bounds the gap between training and test error by a model's capacity (VC dimension, Rademacher complexity), and predicts that a model with more parameters than data should overfit catastrophically. Modern networks do the opposite: they interpolate, even fit pure noise, and still generalize. We derive the classical bounds, work the bias-variance decomposition, show why the bounds go vacuous, and survey what replaced them: double descent, the interpolation threshold, margin and norm-based bounds, and the implicit bias of the optimizer itself.\n",{"path":7244,"title":7245,"module":7241,"summary":7246},"\u002Fdeep-learning\u002Ftheory\u002Fadversarial-robustness","Adversarial Robustness","A trained network can be fooled by a perturbation too small for a human to see: add a carefully aimed vector of magnitude $\\epsilon$ to a correctly classified image and the prediction flips. We derive the fast gradient sign method as the first-order-optimal step inside an $L_\\infty$ ball, explain the linearity hypothesis that makes high-dimensional models so easy to push around, build up to projected gradient descent, and frame adversarial training as a min-max robust-optimization problem with its own accuracy cost. Defenses beyond training continue in the next lesson.\n",{"path":7248,"title":7249,"module":7241,"summary":7250},"\u002Fdeep-learning\u002Ftheory\u002Fadversarial-defenses","Adversarial Defenses","Defending a network against an adversary is far harder than attacking one. This lesson covers the defense side: certified guarantees via randomized smoothing, the transferability that makes black-box attacks possible, and the recurring failure of gradient masking, where a defense hides the attacker's gradient instead of moving the decision boundary. It ends with the adaptive-attack discipline (BPDA, EOT, transfer) that every robustness claim must be tested against.\n",{"path":7252,"title":7253,"module":7241,"summary":7254},"\u002Fdeep-learning\u002Ftheory\u002Fbayesian-and-ensemble-methods","Bayesian & Ensemble Methods","A trained network returns a single point prediction and, with the softmax, a confidence, but that confidence is usually miscalibrated, collapsing to near- certainty even on inputs the model has never seen. This lesson covers uncertainty estimation for networks: the two kinds of uncertainty, the Bayesian posterior over weights and its tractable stand-ins (MC dropout, deep ensembles), and how to check whether a model's reported confidences match observed frequencies.\n",{"path":7256,"title":7257,"module":7241,"summary":7258},"\u002Fdeep-learning\u002Ftheory\u002Fdeep-equilibrium-models","Deep Equilibrium Models","A deep network need not be a fixed stack of layers; it can be a single weight-tied layer iterated to convergence, its output defined implicitly as the fixed point $z^\\star = f_\\theta(z^\\star, x)$. The forward pass becomes root-finding and the backward pass becomes implicit differentiation, so training costs O(1) memory regardless of effective depth. We derive both passes from the implicit function theorem and close the course on defining a layer by a fixed-point condition rather than an explicit stack.\n",{"path":7260,"title":7261,"module":7262,"summary":7263},"\u002Fdeep-learning\u002Fgenerative-models\u002Flinear-factor-models","Linear Factor Models","Generative Models","The simplest generative models share one template: a latent variable drawn from a fixed prior, run through a linear decoder, plus noise. Probabilistic PCA, factor analysis, independent component analysis, and sparse coding are all this template with a different prior on the latents and a different noise model. We derive each marginal, see why ICA needs non-Gaussianity to identify its sources, and show how sparse coding learns Gabor-like dictionary atoms.\n",{"path":7265,"title":7266,"module":7262,"summary":7267},"\u002Fdeep-learning\u002Fgenerative-models\u002Fautoencoders","Autoencoders","An autoencoder is a network trained to copy its input to its output through a narrow channel; the useful product is the bottleneck representation $h$, not the reconstruction. We derive the undercomplete autoencoder and prove its linear case recovers PCA, then trade the bottleneck for explicit regularization (sparse, denoising, contractive) and show how a denoising autoencoder learns the low-dimensional manifold the data lives on.\n",{"path":7269,"title":7270,"module":7262,"summary":7271},"\u002Fdeep-learning\u002Fgenerative-models\u002Fvariational-autoencoders","Variational Autoencoders","An autoencoder compresses, but its latent space has gaps: sample a point between two encodings and the decoder produces noise. The variational autoencoder fixes this by training a probabilistic encoder against a prior, so the latent space becomes a smooth, samplable density. We derive the evidence lower bound it maximizes, the reparameterization trick that lets gradients flow through a random sample, and the closed-form Gaussian regularizer that pulls the posterior toward the prior.\n",{"path":7273,"title":7274,"module":7262,"summary":7275},"\u002Fdeep-learning\u002Fgenerative-models\u002Fgenerative-adversarial-networks","Generative Adversarial Networks","A generative adversarial network trains two networks against each other: a generator that turns noise into samples, and a discriminator that tries to tell real data from forgeries. The game has a clean theory: the optimal discriminator is a likelihood ratio, and at equilibrium the generator minimizes the Jensen–Shannon divergence to the data, with a global optimum exactly when its distribution matches the data. We derive that result, fix the saturating loss that breaks training, and catalogue the failure modes (mode collapse, instability, vanishing gradients) and the architectural fixes.\n",{"path":7277,"title":7278,"module":7262,"summary":7279},"\u002Fdeep-learning\u002Fgenerative-models\u002Fautoregressive-and-normalizing-flows","Autoregressive Models & Normalizing Flows","Two families that provide exact likelihoods, each at a cost. Autoregressive models factor the joint by the probability chain rule and learn each conditional with a masked network: exact $\\log p(x)$, but sampling proceeds one coordinate at a time. Normalizing flows push a simple base density through an invertible map and read $\\log p(x)$ off the change-of-variables formula, trading architectural freedom for a cheap Jacobian determinant via triangular coupling layers.\n",{"path":7281,"title":7282,"module":7262,"summary":7283},"\u002Fdeep-learning\u002Fgenerative-models\u002Fenergy-based-and-boltzmann-machines","Energy-Based & Boltzmann Machines","Energy-based models replace an explicit density with a scalar energy and a Boltzmann normalization, $p(x) = e^{-E(x)}\u002FZ$: simple to specify, but with an intractable partition function $Z$. The Boltzmann machine and its restricted variant make the energy bilinear so the hidden units factorize, and contrastive divergence sidesteps $Z$ by replacing the model expectation with a few Gibbs steps started at the data. We close on the undirected deep models (DBNs and DBMs) and how they differ from the directed VAE.\n",{"path":7285,"title":7286,"module":7262,"summary":7287},"\u002Fdeep-learning\u002Fgenerative-models\u002Fdiffusion-and-score-based-models","Diffusion and Score-Based Models","Corrupt a data point with Gaussian noise in small steps until only noise remains, then train a network to undo one step at a time. We derive the forward process and its closed-form marginal, reduce the variational bound to the single noise-prediction objective that makes diffusion trainable, and show the score-matching view that unifies it with Langevin sampling and the continuous SDE. The lesson closes with DDIM fast sampling, classifier-free guidance, and the latent diffusion that powers modern text-to-image systems.\n",{"path":7289,"title":7290,"module":7291,"summary":7292},"\u002Fdeep-learning\u002Fprobabilistic-methods\u002Fstructured-probabilistic-models","Structured Probabilistic Models","Probabilistic Methods","A joint distribution over $n$ variables is a table with exponentially many entries; nobody can store it, fit it, or sample from it directly. Structure fixes this: a graph whose missing edges encode conditional independencies that factor the joint into small local pieces. We build the two dialects, directed (Bayesian networks) and undirected (Markov random fields), read independence off the graph, and connect the machinery to the latent-variable and energy-based models that power deep generative learning.\n",{"path":7294,"title":7295,"module":7291,"summary":7296},"\u002Fdeep-learning\u002Fprobabilistic-methods\u002Fmonte-carlo-and-mcmc","Monte Carlo & MCMC","Most quantities of interest in a probabilistic model are integrals nobody can compute in closed form: expectations, marginals, partition functions. Monte Carlo replaces the integral with an average over samples; importance sampling reweights samples from a tractable proposal; and when even sampling the target is hard, Markov-chain Monte Carlo builds a chain whose stationary distribution _is_ the target. We derive Metropolis–Hastings and Gibbs, analyze mixing, and close on the partition-function gradient that powers energy-based learning.\n",{"path":7298,"title":7299,"module":7291,"summary":7300},"\u002Fdeep-learning\u002Fprobabilistic-methods\u002Fapproximate-inference","Approximate Inference","In a latent-variable model the quantity we need, the posterior $p(h\\mid v)$ over hidden causes, is almost never computable, because its normalizer is an intractable sum over configurations. Approximate inference reframes the problem as optimization: maximize the evidence lower bound, a tractable functional whose gap to the true log-evidence equals a KL divergence. From that single bound fall expectation–maximization, mean-field variational inference, MAP, and the learned encoders behind variational autoencoders.\n",{"path":7302,"title":7303,"module":7304,"summary":7305},"\u002Fdeep-learning\u002Fpractical\u002Fpractical-methodology","Practical Methodology","Practical Deep Learning","Knowing the algorithms is half the job; the other half is a disciplined loop. Fix a goal and a metric, stand up an end-to-end baseline, then read the train\u002Fvalidation gap to decide whether the next move is more data or a bigger model. We detail that loop: choosing metrics under class imbalance, default baselines by data type, extrapolating the data a target needs, and guarding the data pipeline against the leaks and label bugs that corrupt every gradient. Hyperparameter tuning, debugging, and deployment continue in the sequel.\n",{"path":7307,"title":7308,"module":7304,"summary":7309},"\u002Fdeep-learning\u002Fpractical\u002Fhyperparameters-and-debugging","Hyperparameters & Debugging","The tuning half of the methodology loop. The learning rate is the one hyperparameter that dominates, so we tune it first, on a log scale, coarse to fine, and prefer random search to grid when only a few dials matter. Then an ordered debugging playbook — overfit one batch, check the loss at initialization against ln C, watch the gradient norm, gradient-check against centered finite differences — and, after launch, monitoring for train-test skew and distribution drift with confidence-based abstention.\n",{"path":7311,"title":7312,"module":7304,"summary":7313},"\u002Fdeep-learning\u002Fpractical\u002Frepresentation-learning","Representation Learning","A good representation makes a hard task easy by changing coordinates: it disentangles the factors of variation, spends its bits as a distributed code, and respects the low-dimensional manifold the data lives on. We make those three properties precise, recover the manifold hypothesis, and close on the first method that turned them into training practice — greedy layer-wise unsupervised pretraining — before the sequel picks up how the field learned to reuse those features.\n",{"path":7315,"title":7316,"module":7304,"summary":7317},"\u002Fdeep-learning\u002Fpractical\u002Ftransfer-learning","Transfer Learning","A representation learned once can be reused everywhere. We cover the main mechanisms of reuse: feature extraction versus fine-tuning, the generic-to-specific gradient of features that sets the freeze boundary, the learning-rate discipline that keeps borrowed weights from being erased, domain adaptation when only the input distribution shifts, and the modern arc from supervised transfer to self-supervised foundation models.\n",{"path":7319,"title":7320,"module":7304,"summary":7321},"\u002Fdeep-learning\u002Fpractical\u002Fapplications","Applications","We survey large-scale training (the hardware, the two axes of parallelism, mixed precision, and the compression tricks that shrink a model after it is trained), then specialize the same gradient loop to vision, language, speech, and recommendation. Each domain is a different prior bolted onto one optimizer: convolutional invariance for pixels, distributed word vectors for tokens, sequence transduction for audio, low-rank factorization for the user–item matrix.\n",{"path":7323,"title":7324,"module":7304,"summary":7325},"\u002Fdeep-learning\u002Fpractical\u002Fmodel-compression-and-distillation","Model Compression and Distillation","A trained network and a deployable one are rarely the same object. This lesson is the toolkit for closing that gap: knowledge distillation transfers a large teacher's soft, information-rich logits into a small student; pruning deletes the weights that contribute least; quantization swaps 32-bit floats for 8- or 4-bit integers; and low-rank factorization replaces a fat matrix with two thin ones. We derive each method, show what it costs in accuracy, and lay out which combinations win on which hardware.\n",{"path":7327,"title":7328,"module":7304,"summary":7329},"\u002Fdeep-learning\u002Fpractical\u002Fmeta-learning-and-few-shot","Meta-Learning and Few-Shot Learning","A deep network trained on one example per class overfits. Meta-learning targets this few-shot regime by training across a distribution of tasks so that a new task is learnable from a handful of examples. We formalize the $N$-way $K$-shot episode, then derive the two dominant families: metric methods that learn an embedding where distance classifies (Prototypical Networks), and optimization methods that learn an initialization a few gradient steps can adapt (MAML). We close on the link to transfer learning and to the in-context few-shot behavior of large language models.\n",{"path":7331,"title":7332,"module":7333,"summary":7334},"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Flarge-language-models","Large Language Models","Large Models & Agents","A large language model is a decoder-only Transformer trained on one objective, next-token prediction, then scaled until new behavior appears. This first part builds the object itself: the equivalence between next-token prediction and lossless compression, subword tokenization (BPE, WordPiece, Unigram, SentencePiece) worked on a real sentence, the four pretraining objectives and the attention masks that distinguish them, and the three model families (encoder-only, decoder-only, encoder--decoder) with their parameter budgets. Scaling, decoding, the KV cache, and alignment continue in part two.\n",{"path":7336,"title":7337,"module":7333,"summary":7338},"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fscaling-inference-and-alignment","Scaling, Inference, and Alignment of Language Models","Once a language model is built, three questions remain: how does it improve as it grows, how is it decoded and served affordably, and how is a raw next-token predictor turned into an assistant. We derive the Kaplan power laws and the Chinchilla compute-optimal balance, trace emergent abilities and in-context learning, catalog the decoding strategies from greedy to nucleus sampling, work the KV cache that makes generation quadratic instead of cubic, cover parameter-efficient adaptation by low-rank updates (LoRA), and close on the alignment stack: instruction tuning, RLHF, and DPO.\n",{"path":7340,"title":7341,"module":7333,"summary":7342},"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fseq2seq-pretraining-and-bart","Denoising Sequence-to-Sequence Pretraining: BART","BERT corrupts and reconstructs; GPT predicts the next token. Sequence-to-sequence pretraining unifies both by training a full encoder–decoder as a denoising autoencoder: corrupt the text with a noise function, then reconstruct the original through a bidirectional encoder and an autoregressive decoder. This first part derives the denoising objective, catalogs BART's five noise functions (with a worked Poisson-infilling budget), proves BART specializes to both BERT and GPT, and traces a dimension-annotated forward pass through its encoder--decoder. T5, PEGASUS, fine-tuning, and decoding continue in part two.\n",{"path":7344,"title":7345,"module":7333,"summary":7346},"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Ftext-to-text-transfer-and-conditional-generation","Text-to-Text Transfer and Conditional Generation","BART reconstructs a corrupted document; T5 pushes the same denoising idea into a single interface where every task is a string-to-string map. This second part covers T5's span corruption with sentinel tokens (with a worked token budget), PEGASUS's summarization-matched gap sentences and the MASS midpoint, supervised fine-tuning and beam-search decoding with a length penalty, the exposure-bias failure modes of autoregressive decoding, and a theorem showing why a bidirectional encoder--decoder strictly dominates a decoder-only model when the output is conditioned on a full input.\n",{"path":7348,"title":7349,"module":7333,"summary":7350},"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fspeech-and-audio-models","Speech Recognition: Front-Ends and Alignment","Speech is a long, high-rate sequence whose label is short and unaligned, so the whole subject turns on bridging that mismatch. This first part builds the spectral front-ends that compress a waveform into frames (STFT, mel spectrogram, MFCC, with a worked frame-count), derives CTC's marginalization over alignments and its forward-backward recursion with a two-frame numeric example, and contrasts it with attention-based seq2seq (LAS) and the RNN transducer. Self-supervised and weakly-supervised models, and text-to-speech, continue in part two.\n",{"path":7352,"title":7353,"module":7333,"summary":7354},"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fself-supervised-speech-and-synthesis","Self-Supervised Speech Models and Synthesis","The recognition front-ends and alignment losses of part one all need transcribed audio, which is scarce. This second part removes that dependence: wav2vec 2.0 learns speech representations from unlabeled audio by a masked contrastive objective, HuBERT swaps the contrast for masked prediction of clustered units, and Whisper trades curation for scale with weakly-supervised web audio and a multitask token interface. We close with text-to-speech (the same length mismatch run backwards) and a tour of speech foundation models, discrete audio codecs, and neural TTS.\n",{"path":7356,"title":7357,"module":7333,"summary":7358},"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fai-agents","AI Agents: Tools and Reasoning","A language model that only emits text is a function from prompt to prompt; an agent closes the loop, letting that model act on an environment, read back the result, and decide again. This first part formalizes the agent as a policy over interaction histories, builds out tool calling and the executor trust boundary, the ReAct interleaving of reasoning and action (with concrete traces), and search over thoughts: chain-of-thought, self-consistency, least-to-most, and Tree of Thoughts. Memory, retrieval, reflection, and multi-agent orchestration continue in part two.\n",{"path":7360,"title":7361,"module":7333,"summary":7362},"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fagent-memory-retrieval-and-orchestration","Agent Memory, Retrieval, and Orchestration","An agent's reasoning and tool use only matter if it can remember what it learned and coordinate work larger than one context window. This second part builds the systems around the loop: short-term scratchpad versus long-term vector store, retrieval-augmented generation with a worked softmax over passage scores, reflection (Reflexion, Self-Refine), and multi-agent orchestration. It closes on the failure modes that bound agents — invalid tool calls, horizon-error compounding, context overflow, non-terminating loops — and the benchmarks that score the full loop.\n",{"path":7364,"title":7365,"module":7333,"summary":7366},"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fmixture-of-experts","Mixture-of-Experts","A mixture-of-experts layer replaces one feed-forward network with many and a router that sends each token to only a few of them, so the parameter count and the per-token compute become separate dials. We derive the gated output, sparse top-$k$ routing softmax, the load-balancing loss that stops the router from collapsing onto a single expert, and expert\u002Ftoken capacity with dropping, then work the dimension-annotated tensor shapes and FLOP arithmetic. We trace the architectures from the sparsely-gated LSTM through GShard, Switch Transformer, and Mixtral, cover distributed expert parallelism, and close on the training dynamics, failure modes, and serving costs of a sparse model.\n",{"path":7368,"title":7369,"module":7333,"summary":7370},"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Fmultimodal-models","Multimodal Contrastive Learning","A multimodal model places images, text, and audio in one representation space, so a picture and its caption land close together. This first part builds the contrastive route: the shared embedding space and its residual modality gap, the Vision Transformer image encoder (patch embedding, CLS token, position embeddings, with shapes), the symmetric InfoNCE loss that trains the CLIP dual encoder from a batch similarity matrix (with a worked numeric step), and zero-shot classification as a softmax over class-prompt embeddings. Fusion and vision-language models continue in part two.\n",{"path":7372,"title":7373,"module":7333,"summary":7374},"\u002Fdeep-learning\u002Flarge-models-and-agents\u002Ffusion-and-vision-language-models","Fusion and Vision-Language Models","A contrastive model compares modalities but never lets one read another. This second part builds the fusion route: early, late, and cross-attention fusion, then the three designs that connect a frozen vision encoder to a frozen language model — Flamingo's zero-initialized gated cross-attention, BLIP-2's Q-Former, and LLaVA's linear projector. We work the token-budget arithmetic that separates them, name the object-hallucination and fine-detail failure modes, cover the contrastive-then- instruction-tune recipe and its retrieval\u002Fcaptioning\u002FVQA benchmarks, and close on natively multimodal models.\n",{"path":7376,"title":7377,"module":7378,"summary":7379},"\u002Fdeep-learning\u002Freinforcement-learning\u002Ffoundations-of-reinforcement-learning","Foundations of Reinforcement Learning","Reinforcement Learning","Reinforcement learning is the third paradigm: an agent learns to act by interacting with an environment that returns rewards, not labels. We formalize the interaction as a Markov decision process, define the value functions that rank states and actions, and derive the Bellman expectation and optimality equations that every method downstream solves. Dynamic programming gives the exact answer when the model is known, and its convergence rests on a single fact: the Bellman operator is a contraction.\n",{"path":7381,"title":7382,"module":7378,"summary":7383},"\u002Fdeep-learning\u002Freinforcement-learning\u002Fmodel-free-prediction-and-control","Model-Free Prediction and Control","When the dynamics are unknown, an agent cannot plan against a model; it must learn directly from sampled experience. We build prediction and control from two estimators of the same return: Monte Carlo averages whole episodes, while temporal-difference learning bootstraps from its own next estimate. We trace the bias-variance contrast between them, derive SARSA and Q-learning as the on-policy and off-policy forms of control, unify everything through n-step returns and eligibility traces, and close on the deadly triad that makes off-policy bootstrapping with function approximation diverge.\n",{"path":7385,"title":7386,"module":7378,"summary":7387},"\u002Fdeep-learning\u002Freinforcement-learning\u002Fdeep-q-networks","Deep Q-Networks","A Deep Q-Network replaces the tabular action-value function with a neural approximator $Q(s,a;\\theta)$ and trains it by regression toward a bootstrapped target. Naive online Q-learning with a network diverges, so DQN adds two stabilizers: an experience-replay buffer that decorrelates samples, and a periodically-frozen target network that holds the regression target still. We derive the loss, give the full algorithm and the Atari pipeline, and then layer on Double DQN, the dueling split, prioritized replay, and the Rainbow combination.\n",{"path":7389,"title":7390,"module":7378,"summary":7391},"\u002Fdeep-learning\u002Freinforcement-learning\u002Fpolicy-gradients-and-actor-critic","Policy Gradients and Actor-Critic Methods","Value-based reinforcement learning learns what each state is worth and acts greedily; policy-gradient methods skip the detour and optimize a parameterized policy directly by ascending the gradient of expected return. The policy gradient theorem makes this tractable through the log-derivative trick, turning an intractable gradient of an expectation into an expectation of a gradient. REINFORCE realizes the idea but suffers high variance; baselines, the advantage function, and actor-critic learning reduce it, and trust-region methods (TRPO, PPO) keep each update from destroying the policy it just learned.\n",{"path":7393,"title":7394,"module":7378,"summary":7395},"\u002Fdeep-learning\u002Freinforcement-learning\u002Frl-from-human-feedback","Reinforcement Learning from Human Feedback","Many objectives we want from a model, that it be helpful and harmless, are hard to write down but easy to judge by comparison. RLHF turns that asymmetry into a training signal: fit a reward model to pairwise human preferences under the Bradley-Terry likelihood, then fine-tune the policy to maximize that reward under a KL penalty toward a reference. We derive the reward loss, the KL-regularized RL objective and its closed-form optimum, then show how DPO inverts that optimum to collapse the whole pipeline into one supervised log-sigmoid loss, and survey IPO, KTO, RLAIF, and GRPO.\n",{"path":7397,"title":7398,"module":6,"summary":6},"\u002Fdeep-learning","Deep Learning",{"path":7400,"title":7401,"module":5308,"summary":7402},"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fequilibrium-state-variables-zeroth-law","Equilibrium, State Variables, and the Zeroth Law","Thermodynamics describes a many-body system by a handful of macroscopic variables and the equilibrium relations among them. This lesson fixes the vocabulary: systems and the walls that separate them, state variables versus path-dependent process quantities, quasi-static and reversible idealizations, and the zeroth law, whose transitivity of thermal equilibrium is what lets temperature exist as a number. The ideal-gas thermometer turns that number into a scale, and an equation of state ties the variables into a surface.\n",{"path":7404,"title":7405,"module":5308,"summary":7406},"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Ffirst-law-heat-and-work","The First Law: Internal Energy, Heat, and Work","The first law is energy conservation for a system that exchanges energy as both heat and work. Internal energy is a state function with an exact differential; heat and work are path-dependent process quantities. This lesson states $\\d U=\\delta Q+\\delta W$, computes compression work as an area on the $P$–$V$ plane, defines the heat capacities $C_V$ and $C_P$ and the enthalpy that makes $C_P$ natural, and works the isothermal and adiabatic processes of an ideal gas, including the adiabat $PV^\\gamma=\\text{const}$.\n",{"path":7408,"title":7409,"module":5308,"summary":7410},"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fsecond-law-entropy-and-the-carnot-bound","The Second Law, Carnot Cycles, and Entropy","The second law forbids the free conversion of heat into work. This lesson states the Kelvin and Clausius forms, proves them equivalent, and analyzes the Carnot cycle to get the efficiency bound $1-T_c\u002FT_h$. Carnot's theorem makes that bound universal and defines the thermodynamic temperature scale. The Clausius inequality $\\oint \\delta Q\u002FT\\le 0$ then constructs entropy as a state function, $\\d S=\\delta Q_{\\rm rev}\u002FT$, whose non-decrease in isolated systems is the arrow of time.\n",{"path":7412,"title":7413,"module":5308,"summary":7414},"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fthermodynamic-potentials-and-maxwell-relations","Thermodynamic Potentials and Maxwell Relations","The fundamental relation $\\d U=T\\,\\d S-P\\,\\d V+\\mu\\,\\d N$ packages the first and second laws into one exact differential. Legendre transforms swap each conjugate pair to produce the Helmholtz, enthalpy, Gibbs, and grand potentials, each minimized under its own natural variables. Equality of mixed second partials of these potentials gives the Maxwell relations, which convert unmeasurable entropy derivatives into measurable ones from the equation of state.\n",{"path":7416,"title":7417,"module":5308,"summary":7418},"\u002Fstatistical-mechanics\u002Fthermodynamics\u002Fstability-response-functions-and-the-third-law","Response Functions, Stability, and the Third Law","Response functions — heat capacities, compressibilities, thermal expansion — are the second derivatives of the potentials and the quantities an experiment actually measures. This lesson derives the general relation $C_P-C_V=TV\\alpha^2\u002F\\kappa_T$, shows that convexity of the potentials forces the stability conditions $C_V>0$ and $\\kappa_T>0$, and states the third law: entropy approaches a constant as $T\\to0$, so heat capacities and expansion coefficients vanish there and absolute zero is unattainable.\n",{"path":7420,"title":7421,"module":7422,"summary":7423},"\u002Fstatistical-mechanics\u002Ffoundations\u002Fclassical-statistics-and-equipartition","Classical Statistics and Equipartition","Microstates, Phase Space, and Statistical Entropy","A liter of gas holds on the order of a trillion trillion molecules, far too many to track by their equations of motion. Classical statistical mechanics replaces the trajectories with a single probability law, the Boltzmann distribution, and reads the measurable properties of matter off it: the Maxwell speed distribution, the average energy per degree of freedom, and the heat capacities of gases and solids — together with the low-temperature failures that forced the quantum revision.\n",{"path":7425,"title":7426,"module":7422,"summary":7427},"\u002Fstatistical-mechanics\u002Ffoundations\u002Fphase-space-and-liouvilles-theorem","Phase Space, Trajectories, and Liouville's Theorem","A classical system of N particles is one point in a 6N-dimensional phase space, and its evolution is a single trajectory driven by Hamilton's equations. This lesson builds that geometric picture, introduces the phase-space density of an ensemble, and proves Liouville's theorem: the density is carried by the flow as an incompressible fluid, so phase-space volume is conserved. The stationary densities of equilibrium follow as functions of the conserved quantities alone.\n",{"path":7429,"title":7430,"module":7422,"summary":7431},"\u002Fstatistical-mechanics\u002Ffoundations\u002Fensembles-and-the-equal-probability-postulate","Ensembles and the Postulate of Equal a Priori Probabilities","An ensemble is a probability distribution over the microstates of a system. This lesson states the single postulate on which equilibrium statistical mechanics rests — that an isolated system in equilibrium is equally likely to be in any of its accessible microstates — and works out its consequences: the accessible phase-space volume, the overwhelming dominance of the most probable macrostate as the particle number grows, and the ergodic hypothesis that lets a time average be replaced by an ensemble average.\n",{"path":7433,"title":7434,"module":7422,"summary":7435},"\u002Fstatistical-mechanics\u002Ffoundations\u002Fstatistical-entropy-boltzmann-and-gibbs","Statistical Entropy: Boltzmann and Gibbs","Entropy is the logarithm of the number of accessible microstates. This lesson builds the two statistical entropies — Boltzmann's S = k ln Omega for an isolated system and Gibbs's S = -k sum p ln p for any ensemble — proves they agree for a uniform distribution, and connects both to Shannon's measure of missing information. The second law emerges as the drift toward maximum multiplicity, and maximizing the Gibbs entropy under constraints previews the canonical distribution.\n",{"path":7437,"title":7438,"module":7439,"summary":7440},"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Fmicrocanonical-ensemble-and-entropy","The Microcanonical Ensemble and Statistical Entropy","The Microcanonical Ensemble","An isolated system holds its energy, volume, and particle number fixed, and the fundamental postulate assigns equal probability to every microstate on its energy shell. This lesson builds the microcanonical distribution, defines the enclosed phase-space volume $\\Gamma(E)$, the surface density of states $\\omega(E)=\\d\\Gamma\u002F\\d E$, and the shell count $\\Omega(E)$, shows their logarithms agree to $O(\\ln N)$ for large $N$, and reads the Boltzmann entropy $S=k\\ln\\Omega$ off the count. The measure factors $h^{3N}$ and $N!$ enter here and make $S$ extensive.\n",{"path":7442,"title":7443,"module":7439,"summary":7444},"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Fequilibrium-conditions-temperature-pressure-chemical-potential","Thermal, Mechanical, and Diffusive Equilibrium","Two isolated subsystems that can exchange energy, volume, or particles reach equilibrium at the partition that maximizes their combined entropy. Setting the derivative of the total entropy to zero identifies the statistical definitions $1\u002FT=(\\partial S\u002F\\partial E)$, $P\u002FT=(\\partial S\u002F\\partial V)$, and $-\\mu\u002FT=(\\partial S\u002F\\partial N)$, shows heat flows from hot to cold as an entropy increase, and recovers the fundamental relation $\\d S=(\\d E+P\\,\\d V-\\mu\\,\\d N)\u002FT$ from pure counting.\n",{"path":7446,"title":7447,"module":7439,"summary":7448},"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Fideal-gas-phase-space-and-the-sackur-tetrode-entropy","The Ideal Gas, Phase-Space Volume, and the Sackur–Tetrode Entropy","The monatomic ideal gas is the first system whose microcanonical count can be done in closed form. The momentum integral is the volume of a $3N$-dimensional ball of radius $\\sqrt{2mE}$, the configuration integral is $V^N$, and together they give the Sackur–Tetrode entropy $S=Nk[\\ln(V\u002FN\\lambda^3)+5\u002F2]$ with the thermal wavelength $\\lambda=h\u002F\\sqrt{2\\pi mkT}$. The formula matches the measured entropy of helium, fixes the classical regime $n\\ll n_Q$, and shows why the $N!$ is needed for extensivity.\n",{"path":7450,"title":7451,"module":7439,"summary":7452},"\u002Fstatistical-mechanics\u002Fmicrocanonical\u002Ftwo-state-systems-paramagnets-and-negative-temperature","Two-State Systems, Paramagnets, and Negative Temperature","The ideal two-state paramagnet has a multiplicity counted by the binomial coefficient, an entropy that is an inverted dome in the energy, and a temperature read from the slope $1\u002FT=\\partial S\u002F\\partial E$. Because the energy is bounded above, the slope changes sign past the entropy maximum: a population-inverted spin system has a negative absolute temperature, which is hotter than any positive temperature. Nuclear-spin experiments and lasers realize the inverted state.\n",{"path":7454,"title":7455,"module":7456,"summary":7457},"\u002Fstatistical-mechanics\u002Fcanonical\u002Fcanonical-ensemble-and-the-boltzmann-distribution","The Canonical Ensemble and the Boltzmann Distribution","The Canonical Ensemble","A system held at fixed temperature by contact with a heat reservoir is described by the canonical ensemble. Expanding the reservoir entropy to first order in the system energy gives the Boltzmann distribution $p_i\\propto e^{-\\beta E_i}$, and the same law follows from maximizing the Gibbs entropy at fixed mean energy. Both routes identify $\\beta=1\u002Fk_BT$ and fix the probability of every microstate from the temperature alone.\n",{"path":7459,"title":7460,"module":7456,"summary":7461},"\u002Fstatistical-mechanics\u002Fcanonical\u002Fpartition-function-and-the-helmholtz-free-energy","The Partition Function and the Helmholtz Free Energy","The normalizing sum of the Boltzmann distribution, the partition function $Z=\\sum_i e^{-\\beta E_i}$, is a generating function for the thermodynamics. The mean energy is $-\\partial\\ln Z\u002F\\partial\\beta$, and the Gibbs entropy of the canonical distribution collapses to the bridge relation $F=-k_BT\\ln Z$. From $F$ every thermodynamic quantity follows by differentiation, and $Z$ factorizes over independent degrees of freedom.\n",{"path":7463,"title":7464,"module":7456,"summary":7465},"\u002Fstatistical-mechanics\u002Fcanonical\u002Fenergy-fluctuations-and-ensemble-equivalence","Energy Fluctuations and the Equivalence of Ensembles","In the canonical ensemble the energy fluctuates, and the second derivative of $\\ln Z$ gives its variance. The fluctuation–response identity $\\langle\\Delta E^2\\rangle = k_BT^2C_V$ ties the spread of the energy to the heat capacity, and the relative fluctuation falls as $1\u002F\\sqrt{N}$. In the thermodynamic limit the canonical energy distribution is a sharp spike, and the canonical and microcanonical ensembles predict the same thermodynamics.\n",{"path":7467,"title":7468,"module":7456,"summary":7469},"\u002Fstatistical-mechanics\u002Fcanonical\u002Fthe-einstein-solid-and-harmonic-systems","Harmonic Systems: The Einstein Solid and Vibrational Heat Capacity","A quantum harmonic oscillator has a geometric partition function summed in closed form, giving a mean energy $\\hbar\\omega(\\tfrac12+\\langle n\\rangle)$ with the Bose occupation factor. Modeling a solid as $3N$ independent oscillators yields a heat capacity that rises from zero and saturates at the Dulong–Petit value $3Nk_B$. The Einstein temperature sets the crossover, and the model's exponential low-temperature falloff, too steep against the observed $T^3$, motivates the Debye theory.\n",{"path":7471,"title":7472,"module":7456,"summary":7473},"\u002Fstatistical-mechanics\u002Fcanonical\u002Fparamagnetism-and-the-schottky-anomaly","Paramagnetism, Two-Level Systems, and the Schottky Anomaly","A magnetic moment in a field is a two-level system whose partition function is a hyperbolic cosine. The magnetization of a spin-$\\tfrac12$ paramagnet is $N\\mu\\tanh(\\mu B\u002Fk_BT)$, generalizing to the Brillouin function for spin $J$; it gives Curie's law $\\chi\\propto 1\u002FT$ at high temperature and saturates at low temperature. A finite level gap produces the Schottky heat-capacity peak, and the temperature dependence of the entropy on the field is the basis of adiabatic demagnetization cooling.\n",{"path":7475,"title":7476,"module":7477,"summary":7478},"\u002Fstatistical-mechanics\u002Fclassical-gas\u002Fideal-gas-partition-function-and-the-gibbs-paradox","The Ideal Gas Partition Function and the Gibbs Paradox","The Classical Ideal Gas","The classical monatomic ideal gas built from the partition function. The single-particle sum is $z_1=V\u002F\\lambda^3$ with the thermal de Broglie wavelength $\\lambda$; the $N$-particle partition function is $z_1^N\u002FN!$, and the $N!$ is forced by indistinguishability. From $Z$ the ideal-gas law, $U=\\tfrac32 Nk_BT$, and the Sackur–Tetrode entropy follow. The $N!$ makes the entropy extensive and resolves the Gibbs paradox: mixing identical gases produces no entropy change.\n",{"path":7480,"title":7481,"module":7477,"summary":7482},"\u002Fstatistical-mechanics\u002Fclassical-gas\u002Fequipartition-and-the-virial-theorem","Equipartition and the Virial Theorem","The equipartition theorem derived from the canonical ensemble: every phase-space coordinate that enters the Hamiltonian quadratically carries a mean energy $\\tfrac12 k_BT$. The generalized form $\\langle x_i\\,\\partial H\u002F\\partial x_j\\rangle = k_BT\\,\\delta_{ij}$ contains equipartition and the classical virial theorem as special cases. Equipartition fixes the classical heat capacities, fails by quantum freeze-out when a level gap exceeds $k_BT$, and shifts for a relativistic gas whose energy is linear rather than quadratic in momentum.\n",{"path":7484,"title":7485,"module":7477,"summary":7486},"\u002Fstatistical-mechanics\u002Fclassical-gas\u002Fmolecular-gases-rotation-and-vibration","Molecular Gases: Rotational and Vibrational Degrees of Freedom","The internal partition function of a diatomic gas factorizes into translational, rotational, vibrational, and electronic parts. The rigid rotor gives a rotational temperature $\\theta_{\\rm rot}$; the harmonic bond gives a vibrational temperature $\\theta_{\\rm vib}$. Each mode contributes to the heat capacity only above its characteristic temperature, producing the diatomic $C_V$ staircase from $\\tfrac32 R$ to $\\tfrac52 R$ to $\\tfrac72 R$. Homonuclear molecules carry a symmetry number, and hydrogen splits into ortho and para species.\n",{"path":7488,"title":7489,"module":7490,"summary":7491},"\u002Fstatistical-mechanics\u002Fgrand-canonical\u002Fgrand-canonical-ensemble-and-the-grand-partition-function","The Grand Canonical Ensemble","Grand Canonical Ensemble","When a system exchanges both energy and particles with a reservoir, the reservoir fixes its temperature and its chemical potential. Expanding the reservoir entropy to first order in the exchanged energy and particle number gives the Gibbs factor $e^{-\\beta(E-\\mu N)}$, and summing it over every microstate of every particle number gives the grand partition function $\\Xi$. The grand potential $\\Phi = -k_BT\\ln\\Xi = -PV$ generates the mean particle number, energy, entropy, and pressure by differentiation.\n",{"path":7493,"title":7494,"module":7490,"summary":7495},"\u002Fstatistical-mechanics\u002Fgrand-canonical\u002Fchemical-potential-fugacity-and-number-fluctuations","Chemical Potential, Fugacity, and Number Fluctuations","The chemical potential is the energy to add one particle at fixed entropy and volume, equal to the slope of the free energy in the particle number. For the classical ideal gas $\\mu=k_BT\\ln(n\\lambda^3)$ is large and negative, and the fugacity $z=n\\lambda^3$ is small. The grand ensemble makes the particle number fluctuate; its variance $\\langle\\Delta N^2\\rangle=k_BT(\\partial N\u002F\\partial\\mu)$ equals $k_BT\\,N^2\\kappa_T\u002FV$, tying density fluctuations to the isothermal compressibility. Equality of $\\mu$ is the condition for diffusive equilibrium and phase coexistence.\n",{"path":7497,"title":7498,"module":7490,"summary":7499},"\u002Fstatistical-mechanics\u002Fgrand-canonical\u002Fensemble-summary-and-the-thermodynamic-web","The Three Ensembles and the Thermodynamic Web","The microcanonical, canonical, and grand canonical ensembles hold different variables fixed and generate different potentials — the entropy $S$, the Helmholtz free energy $F$, and the grand potential $\\Phi$ — linked by Legendre transforms that trade each fixed variable for its conjugate. Each successive ensemble lets one more quantity fluctuate. In the thermodynamic limit the three agree, the relative fluctuations vanishing as $1\u002F\\sqrt{N}$; the ideal gas gives the same equation of state in all three. The choice of ensemble is a matter of convenience, set by which sum is easiest.\n",{"path":7501,"title":7502,"module":7503,"summary":7504},"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fquantum-statistics-bose-einstein-and-fermi-dirac","Quantum Statistics — Bose-Einstein and Fermi-Dirac","Quantum Statistics","Quantum particles of the same kind are genuinely indistinguishable: no label survives an overlap of their wave functions. Counting states with that constraint replaces the Boltzmann distribution with two quantum laws — the Bose-Einstein distribution for integer-spin particles, which clump into shared states, and the Fermi-Dirac distribution for half-integer-spin particles, which exclude one another. Both reduce to Boltzmann in the dilute, hot limit, and a de Broglie criterion says exactly when.\n",{"path":7506,"title":7507,"module":7503,"summary":7508},"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fderiving-the-quantum-distributions","Deriving the Quantum Distributions from the Grand Ensemble","The Bose-Einstein and Fermi-Dirac distributions follow from one observation: in the occupation-number representation the single-particle modes are independent, so the grand partition function factorizes into one factor per mode. A boson mode sums a geometric series over all occupancies; a fermion mode sums two terms. Differentiating each factor gives the mean occupation $1\u002F(e^{\\beta(\\varepsilon-\\mu)}\\mp 1)$, the Maxwell-Boltzmann limit when occupancies are small, and the occupation fluctuations that distinguish bunching from anti-bunching.\n",{"path":7510,"title":7511,"module":7503,"summary":7512},"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fthe-classical-limit-and-quantum-concentration","The Classical Limit and Quantum Concentration","When every single-particle level is nearly empty, both quantum distributions collapse to the Maxwell-Boltzmann form, and the fugacity equals the ratio of the number density to the quantum concentration $n_Q = 1\u002F\\lambda^3$. The gas is classical when $n \\ll n_Q$, degenerate when $n \\gtrsim n_Q$. The chemical potential is large and negative in the classical regime and rises through zero as the gas degenerates. The leading quantum correction to the ideal-gas law is a second virial term that lowers the pressure for bosons and raises it for fermions — a statistical attraction and repulsion with no interaction behind it.\n",{"path":7514,"title":7515,"module":7503,"summary":7516},"\u002Fstatistical-mechanics\u002Fquantum-statistics\u002Fideal-quantum-gases-general-framework","Ideal Quantum Gases: The General Framework","Every ideal quantum gas is handled by one calculation. The sum over single-particle modes becomes an energy integral weighted by a density of states $g(\\varepsilon)\\propto\\varepsilon^{1\u002F2}$, and the number and pressure reduce to the Bose and Fermi functions $g_\\nu(z)$ and $f_\\nu(z)$ of the fugacity. An integration by parts fixes $PV=\\tfrac23 U$ for a nonrelativistic gas and $PV=\\tfrac13 U$ for an ultrarelativistic one, independent of statistics. Specializing the density of states and the chemical potential then produces the photon gas, phonons, the Bose gas, and the Fermi gas as four branches of the same framework.\n",{"path":7518,"title":7519,"module":7520,"summary":7521},"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fbose-einstein-condensation-and-the-fermion-gas","Bose-Einstein Condensation and the Fermion Gas","Bosonic Systems","Below a critical temperature a boson gas drops a macroscopic fraction of its particles into the single ground state — Bose-Einstein condensation, the mechanism behind superfluid helium and the dilute-atom condensates cooled to nanokelvin. The same statistics applied to a photon gas reproduces Planck's blackbody spectrum. Fermions do the opposite: forbidden from sharing states, they fill every level up to the Fermi energy, and that filled sea governs the electrons in metals and the pressure that holds up a white dwarf.\n",{"path":7523,"title":7524,"module":7520,"summary":7525},"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fthe-photon-gas-and-plancks-radiation-law","The Photon Gas and Planck's Radiation Law","Electromagnetic radiation in equilibrium with cavity walls is a gas of non-conserved bosons, and non-conservation forces the chemical potential to zero. Counting standing-wave modes with two polarizations and weighting each by the Bose occupation gives the Planck spectral energy density. Its low-frequency tail reproduces the classical Rayleigh-Jeans law and the ultraviolet catastrophe; the Bose factor cuts the divergence off at high frequency and the peak obeys Wien's displacement law.\n",{"path":7527,"title":7528,"module":7520,"summary":7529},"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fblackbody-thermodynamics-and-radiation-pressure","Blackbody Thermodynamics and Radiation Pressure","Integrating the Planck spectrum over all frequencies gives the total energy density proportional to the fourth power of temperature — the Stefan-Boltzmann law — and the isotropy of a relativistic gas fixes the radiation pressure at one third of the energy density. From the free energy follow the entropy and heat capacity, both proportional to T cubed, and the adiabatic law for radiation. The results govern the pressure inside stars and the cooling of the cosmic microwave background as the universe expands.\n",{"path":7531,"title":7532,"module":7520,"summary":7533},"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fphonons-and-the-debye-model","Phonons and the Debye Model","The vibrations of a crystal lattice are quantized into phonons — bosons of zero chemical potential, counted exactly like cavity photons but with three polarizations, a finite sound speed, and a total of 3N modes. The Debye model replaces the true dispersion by a linear one cut off at a frequency that enforces that count. It gives the correct low-temperature T-cubed heat capacity the Einstein model missed and recovers the Dulong-Petit value at high temperature.\n",{"path":7535,"title":7536,"module":7520,"summary":7537},"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fbose-einstein-condensation-derived","Bose-Einstein Condensation Derived","For a gas of conserved bosons the excited states can hold only a finite number of particles at fixed temperature, set by the Bose function at unit fugacity. When the total exceeds that ceiling the surplus collapses into the single ground state, which the continuum density-of-states integral misses and which must be restored by hand. This fixes the critical temperature, the condensate fraction, and the fact that a uniform gas condenses only in three or more dimensions.\n",{"path":7539,"title":7540,"module":7520,"summary":7541},"\u002Fstatistical-mechanics\u002Fbose-systems\u002Fthermodynamics-of-the-bose-gas-and-superfluidity","Thermodynamics of the Bose Gas and Superfluidity","The energy and pressure of the ideal Bose gas follow from the Bose function at the order above the density, and below the critical temperature the pressure depends on temperature alone because the condensate carries none. The heat capacity rises to a cusp at the transition. Real superfluid helium departs from the ideal gas because interactions matter: the Landau criterion ties frictionless flow to the phonon-roton excitation spectrum, and the two-fluid model carries a second sound.\n",{"path":7543,"title":7544,"module":7545,"summary":7546},"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fthe-ideal-fermi-gas-at-zero-temperature","The Ideal Fermi Gas at Zero Temperature","Degenerate Fermi Gas","At absolute zero a gas of non-interacting fermions fills every single-particle state up to the Fermi energy and leaves the rest empty, a filled Fermi sphere in momentum space. This lesson computes the Fermi momentum, energy, and temperature from the density, the density of states, the total ground-state energy, and the degeneracy pressure that grows as $n^{5\u002F3}$. Numerical Fermi energies for metals set the scale: they are electron-volts, so room temperature is deep in the degenerate regime.\n",{"path":7548,"title":7549,"module":7545,"summary":7550},"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fsommerfeld-expansion-and-electrons-in-metals","The Sommerfeld Expansion and Electrons in Metals","Turning on a small temperature blurs the Fermi step over a shell of width $k_BT$ around $\\epsilon_F$. The Sommerfeld expansion turns integrals over the Fermi function into a power series in $(k_BT\u002F\\epsilon_F)^2$, giving the shift of the chemical potential and a heat capacity linear in $T$. This resolves the old puzzle of the missing electronic heat capacity, predicts the combined $C=\\gamma T+AT^3$ of a metal, and gives the temperature-independent Pauli paramagnetism of the electron gas.\n",{"path":7552,"title":7553,"module":7545,"summary":7554},"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fwhite-dwarfs-and-the-chandrasekhar-limit","White Dwarfs and the Chandrasekhar Limit","A white dwarf is held up against its own gravity by the degeneracy pressure of its electrons. Balancing that pressure against gravity gives a mass-radius relation $R\\propto M^{-1\u002F3}$: heavier white dwarfs are smaller and denser. As the density rises the electrons turn relativistic, the pressure softens from $n^{5\u002F3}$ to $n^{4\u002F3}$, and the star can no longer support itself above a critical mass. This lesson derives that Chandrasekhar mass, about $1.4\\,M_\\odot$, and what lies beyond it.\n",{"path":7556,"title":7557,"module":7545,"summary":7558},"\u002Fstatistical-mechanics\u002Ffermi-gas\u002Fneutron-stars-and-nuclear-matter","Neutron Stars and Dense Matter","When a collapsing core passes nuclear density, electron capture converts the matter to neutrons and their degeneracy pressure takes over. The same balance that fixes a white dwarf, rescaled by the neutron mass, gives a neutron star of a few solar masses in a ten-kilometre radius. General relativity is no longer a correction: the Tolman-Oppenheimer-Volkoff equation replaces the Newtonian balance and sets a maximum mass around two solar masses. This lesson rescales the Fermi-gas argument, states where it breaks, and places the compact objects in one stability sequence.\n",{"path":7560,"title":7561,"module":7562,"summary":7563},"\u002Fstatistical-mechanics\u002Finteractions\u002Fthe-cluster-expansion-and-virial-coefficients","The Cluster Expansion and Virial Coefficients","Interacting Gases","A real gas departs from $PV=Nk_BT$ because its molecules interact. The configuration integral factors through the Mayer function $f_{ij}=e^{-\\beta u_{ij}}-1$, and expanding it in powers of density produces the virial expansion $PV\u002FNk_BT = 1 + B_2(T)n + B_3(T)n^2 + \\cdots$. The second virial coefficient $B_2(T)=-\\tfrac12\\int f\\,\\d^3r$ is a single integral over the pair potential; it is positive for a hard core, negative for an attractive well, and vanishes at the Boyle temperature where the two balance.\n",{"path":7565,"title":7566,"module":7562,"summary":7567},"\u002Fstatistical-mechanics\u002Finteractions\u002Fthe-van-der-waals-gas-and-liquid-gas-coexistence","The van der Waals Gas and Liquid-Gas Coexistence","Resumming the second virial coefficient $B_2=b-a\u002Fk_BT$ into an equation of state gives the van der Waals model $(P+a\u002Fv^2)(v-b)=k_BT$, the simplest theory of a fluid that condenses. Below the critical temperature its isotherms develop a mechanically unstable loop; the Maxwell equal-area construction replaces the loop with a coexistence tie line. The critical point sits at $v_c=3b$, $k_BT_c=8a\u002F27b$, $P_c=a\u002F27b^2$, and the model predicts universal but incorrect critical exponents because it ignores fluctuations.\n",{"path":7569,"title":7570,"module":7562,"summary":7571},"\u002Fstatistical-mechanics\u002Finteractions\u002Fquantum-gases-with-interactions-and-exchange","Quantum Gases with Interactions and Statistical Exchange","A quantum gas has a nonzero second virial coefficient even with no forces between the particles: symmetrization alone produces an effective statistical interaction, attractive for bosons and repulsive for fermions, with range the thermal wavelength $\\lambda$. This lesson derives that exchange contribution $B_2=\\mp\\lambda^3\u002F2^{5\u002F2}g$, writes it as a statistical potential $v_s(r)=-k_BT\\ln(1\\pm e^{-2\\pi r^2\u002F\\lambda^2})$, and shows how real interactions add on top through the Beth-Uhlenbeck phase-shift formula, reducing at low temperature to a single scattering length.\n",{"path":7573,"title":7574,"module":7575,"summary":7576},"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fphases-coexistence-and-classification","Phases, Coexistence, and the Classification of Transitions","Phase Transitions","A phase transition is a point where the free energy of a substance loses analyticity, so a small change in temperature or pressure produces a qualitative change of state. This lesson maps the coexistence curves of a pure substance, derives the Clausius-Clapeyron relation between the slope of a coexistence line and its latent heat, and separates first-order transitions (discontinuous entropy and density) from continuous ones (a vanishing order parameter and divergent response). The Ehrenfest scheme, the order parameter, and the triple and critical points fix the vocabulary the rest of the module builds on.\n",{"path":7578,"title":7579,"module":7575,"summary":7580},"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fthe-ising-model-and-exact-solutions","The Ising Model and Exact Results","The Ising model reduces cooperative ordering to spins on a lattice coupled to their neighbors, and the same Hamiltonian describes uniaxial magnets, the liquid-gas critical point through the lattice gas, and binary alloys. This lesson solves the one-dimensional chain exactly with the transfer matrix, shows by a domain-wall argument why one dimension has no ordered phase at any positive temperature, contrasts the survival of order in two dimensions, and quotes Onsager's exact two-dimensional results: the critical temperature, the logarithmically divergent heat capacity, and the magnetization exponent one eighth.\n",{"path":7582,"title":7583,"module":7575,"summary":7584},"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fmean-field-theory-and-the-weiss-model","Mean-Field Theory and Spontaneous Symmetry Breaking","Mean-field theory replaces the neighbors of each spin by their average, turning the interacting Ising model into a single spin in a self-consistent field. The resulting equation m = tanh(beta J z m + beta h) has only the zero solution above a critical temperature and gains a nonzero root below it, giving spontaneous magnetization and a mean-field critical temperature k T_c = J z. The Bragg-Williams free energy turns single-welled above T_c and double-welled below, the picture of spontaneous symmetry breaking. The approximation is exact in high dimension and fails below the upper critical dimension four, quantified by the Ginzburg criterion.\n",{"path":7586,"title":7587,"module":7575,"summary":7588},"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fcritical-exponents-and-landau-theory","Critical Exponents, Scaling, and Landau Theory","Near a continuous transition every singular quantity follows a power law in the reduced temperature, and the exponents alpha, beta, gamma, delta, nu, and eta encode the transition more sharply than T_c itself. Landau theory expands the free energy in the order parameter and delivers the mean-field exponents in a few lines. They disagree with experiment and with the exact two-dimensional Ising values, but the exponents are not independent: the scaling relations of Rushbrooke, Widom, Fisher, and Josephson tie them together, and the correlation length sets the length scale that organizes universality classes.\n",{"path":7590,"title":7591,"module":7575,"summary":7592},"\u002Fstatistical-mechanics\u002Fphase-transitions\u002Fthe-renormalization-group-idea","Scaling and the Renormalization-Group Idea","At a critical point fluctuations exist on every length scale, so the system looks the same after coarse-graining. The renormalization group makes this self-similarity a computation: group spins into blocks, integrate out the short scales, and track how the couplings change. The transformation has fixed points, and the flow near a critical fixed point separates relevant couplings that grow from irrelevant ones that shrink, which is why only dimension and symmetry survive to set the exponents. The one-dimensional Ising decimation carries the whole scheme through in closed form and reproduces the absence of a finite-temperature transition.\n",{"path":7594,"title":7595,"module":7596,"summary":7597},"\u002Fstatistical-mechanics\u002Ffluctuations\u002Fthermodynamic-fluctuations-and-response","Thermodynamic Fluctuations and Response Functions","Fluctuations and Response","Thermodynamic variables are sharp only on average; a macroscopic system in equilibrium fluctuates about its mean values. Einstein inverted Boltzmann's $S=k_B\\ln\\Omega$ into a Gaussian probability for a fluctuation, $w\\propto e^{\\Delta S\u002Fk_B}$, and the second moments it predicts reproduce the response functions: $\\langle\\Delta E^2\\rangle=k_BT^2C_V$, $\\langle\\Delta V^2\\rangle=k_BTV\\kappa_T$, $\\langle\\Delta M^2\\rangle=k_BT\\chi_T$. The variances diverge where the responses diverge, at a critical point, producing critical opalescence and the breakdown of the thermodynamic description.\n",{"path":7599,"title":7600,"module":7596,"summary":7601},"\u002Fstatistical-mechanics\u002Ffluctuations\u002Fbrownian-motion-and-the-langevin-equation","Brownian Motion and the Langevin Equation","A pollen grain in water executes a random walk driven by molecular collisions. Einstein tied its diffusion constant to its mobility, $D=\\mu_{\\mathrm{mob}}k_BT$, turning a visible motion into a measurement of Avogadro's number. The Langevin equation splits the collisions into a systematic drag and a random force whose strength is fixed by the drag through $\\langle\\xi(t)\\xi(t')\\rangle=2\\gamma k_BT\\,\\delta(t-t')$ — the first fluctuation–dissipation relation. The mean-square displacement grows ballistically at short times and linearly, $\\langle r^2\\rangle=2dDt$, at long times, and the Stokes–Einstein relation $D=k_BT\u002F6\\pi\\eta a$ closes the loop to Perrin's experiments.\n",{"path":7603,"title":7604,"module":7596,"summary":7605},"\u002Fstatistical-mechanics\u002Ffluctuations\u002Flinear-response-and-the-fluctuation-dissipation-theorem","Linear Response and the Fluctuation-Dissipation Theorem","A system driven by a weak external field responds through a generalized susceptibility $\\chi(\\omega)$ whose imaginary part measures dissipation. The Wiener–Khinchin theorem makes the power spectrum of equilibrium fluctuations the Fourier transform of their correlation function, and the fluctuation–dissipation theorem ties the two together: $S_x(\\omega)=(2k_BT\u002F\\omega)\\,\\chi''(\\omega)$, so the spectrum of spontaneous fluctuations is fixed by the dissipative response. The Johnson–Nyquist noise of a resistor, $\\langle V^2\\rangle=4k_BTR\\,\\Delta f$, is the canonical example, and Onsager reciprocity closes the subject.\n",{"path":7607,"title":7608,"module":6,"summary":6},"\u002Fstatistical-mechanics","Statistical Mechanics",{"path":7610,"title":7611,"module":7612,"summary":7613},"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fbonding-mechanisms","Bonding Mechanisms","Molecules and Chemical Bonding","A molecule forms when the total energy of two atoms drops below the energy of the separated pair. This lesson works through the four mechanisms that produce that minimum: the ionic bond from charge transfer, the covalent bond from shared electron wave functions, the metallic bond, and the weak dipole-dipole and hydrogen bonds, computing bond lengths and dissociation energies for NaCl, H₂, and H₂⁺.\n",{"path":7615,"title":7616,"module":7612,"summary":7617},"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fmolecular-orbitals-and-h2-plus","The Molecular-Orbital Method and H₂⁺","The hydrogen molecule ion is the two-center problem that fixes the language of chemical bonding. This lesson builds the molecular orbital as a linear combination of atomic orbitals, minimizes the energy through the variational secular equation, and reduces the result to three two-center integrals: the overlap, the Coulomb term, and the exchange (resonance) integral. The bonding and antibonding levels, their potential-energy curves, and the charge piled between the nuclei follow from those integrals.\n",{"path":7619,"title":7620,"module":7612,"summary":7621},"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fhydrogen-molecule-and-exchange","The Hydrogen Molecule, Exchange, and Hybridization","Adding the second electron turns the one-electron ion into the two-electron hydrogen molecule, where electron-electron repulsion and the Pauli principle govern the bond. This lesson contrasts the Heitler-London valence-bond and molecular-orbital wave functions, derives the singlet-triplet splitting as an exchange energy, shows why naive molecular orbitals fail at dissociation, and builds the sp, sp², and sp³ hybrids that fix the directed geometry of covalent bonds.\n",{"path":7623,"title":7624,"module":7612,"summary":7625},"\u002Fcondensed-matter\u002Fmolecules-and-bonding\u002Fvan-der-waals-forces","Van der Waals Forces","The bond of last resort acts between all atoms, even closed-shell noble gases with no permanent moment. This lesson separates the three van der Waals contributions — Keesom orientation, Debye induction, and London dispersion — derives the London 1\u002Fr⁶ attraction from the coupled-oscillator and second-order perturbation pictures, and assembles the Lennard-Jones potential to compute the equilibrium spacing and cohesive energy of the noble-gas crystals, argon in particular.\n",{"path":7627,"title":7628,"module":7629,"summary":7630},"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Frotational-vibrational-spectra","Rotational and Vibrational Spectra of Molecules","Molecular Spectra","A diatomic molecule stores energy in three well-separated ledgers: electronic, vibrational, and rotational. Quantizing the rigid rotor gives levels spaced as ℓ(ℓ+1); quantizing the bond as a harmonic oscillator gives equally spaced vibrational levels. Their combination produces the P and R branches of an infrared absorption band, from which the bond length and force constant are read directly.\n",{"path":7632,"title":7633,"module":7629,"summary":7634},"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Fanharmonicity-and-rovibrational-structure","Anharmonicity and Rovibrational Structure","The rigid rotor and harmonic oscillator are first approximations. A real bond follows the Morse potential, whose levels converge toward dissociation; a real rotor stretches centrifugally; and vibration couples to rotation, so the rotational constant depends on the vibrational level. This lesson works out the anharmonic and centrifugal corrections, the Birge-Sponer route to the dissociation energy, the isotope shift, and the thermal band envelope.\n",{"path":7636,"title":7637,"module":7629,"summary":7638},"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Framan-and-electronic-bands","Raman Scattering and Electronic Bands","Not every vibration absorbs in the infrared. Raman scattering reaches modes that modulate the polarizability, giving Stokes and anti-Stokes lines whose intensity ratio measures temperature, and the mutual-exclusion rule pairs it with infrared absorption. Electronic transitions add the vibronic structure of band spectra, governed by the Franck-Condon principle, and the radiative fates of an excited state are sorted by the Jablonski diagram into fluorescence and phosphorescence.\n",{"path":7640,"title":7641,"module":7629,"summary":7642},"\u002Fcondensed-matter\u002Fmolecular-spectra\u002Flasers-and-masers","Lasers, Masers, and Stimulated Emission","Einstein's three radiative processes — absorption, spontaneous emission, and stimulated emission — and the coefficients that relate them. Stimulated emission produces coherent photons, and inverting the level populations turns it into net amplification. We build the ruby three-level laser and the helium-neon four-level laser, and show why the fourth level makes inversion easy.\n",{"path":7644,"title":7645,"module":7646,"summary":7647},"\u002Fcondensed-matter\u002Fcrystal-structure\u002Fstructure-of-solids","The Structure of Solids","Crystal Structure","A crystal is a unit cell repeated in three dimensions. We classify the common cubic lattices, compute the Coulomb energy of an ionic crystal through the Madelung constant, and show how the divergent naive lattice sum is tamed by cubic shells. The cohesive energy that results predicts melting points and connects the diatomic bond of an earlier lesson to the bulk solid.\n",{"path":7649,"title":7650,"module":7646,"summary":7651},"\u002Fcondensed-matter\u002Fcrystal-structure\u002Fbravais-lattices-and-crystal-systems","Bravais Lattices, Bases, and Crystal Structures","A crystal is a Bravais lattice decorated by a basis. This lesson separates the two, builds primitive and Wigner-Seitz cells, enumerates the seven crystal systems and fourteen Bravais lattices, and fixes the language of point and space groups. Miller indices label planes and directions, and the packing fractions of the close-packed, cubic, and diamond structures follow from the geometry.\n",{"path":7653,"title":7654,"module":7646,"summary":7655},"\u002Fcondensed-matter\u002Fcrystal-structure\u002Freciprocal-lattice-and-brillouin-zones","The Reciprocal Lattice and Brillouin Zones","Every periodic crystal has a dual lattice in wavevector space. This lesson defines the reciprocal lattice through the condition b_i dot a_j equals two pi delta, derives its properties, shows the reciprocal of fcc is bcc, links reciprocal vectors to families of lattice planes, and builds the first Brillouin zone as the Wigner-Seitz cell of the reciprocal lattice, including the higher zones.\n",{"path":7657,"title":7658,"module":7646,"summary":7659},"\u002Fcondensed-matter\u002Fcrystal-structure\u002Fdiffraction-and-structure-factors","X-ray and Neutron Diffraction","A crystal diffracts radiation whose wavelength matches its atomic spacing. This lesson derives the Bragg condition, the equivalent Laue condition 2k dot G equals G squared, and the Ewald-sphere construction, then computes the geometric structure factor that produces systematic absences for bcc and fcc, the atomic form factor, and the powder method. It closes on why neutrons and electrons complement X-rays.\n",{"path":7661,"title":7662,"module":7663,"summary":7664},"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fphonon-dispersion","The Harmonic Crystal and Phonon Dispersion","Lattice Dynamics","Atoms in a crystal vibrate about their equilibrium sites, and expanding the potential to second order turns the whole lattice into a set of coupled harmonic oscillators. This lesson sets up the harmonic approximation and the dynamical matrix, solves the monatomic linear chain for its dispersion omega(k) = 2 sqrt(K\u002FM) times the absolute sine of ka over two, explains why wavevectors outside the first Brillouin zone are redundant, and extends the chain to two atoms per cell to produce acoustic and optical branches with a frequency gap.\n",{"path":7666,"title":7667,"module":7663,"summary":7668},"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fphonons-quantization-and-dos","Phonons, Density of States, and Crystal Momentum","Quantizing the normal modes of a harmonic crystal turns each vibrational mode into a quantum oscillator whose excitations are phonons. This lesson counts phonons with Bose-Einstein statistics, defines crystal momentum and the normal versus Umklapp distinction in momentum conservation, builds the density of states with its van Hove singularities, and shows how inelastic neutron scattering measures a dispersion curve point by point.\n",{"path":7670,"title":7671,"module":7663,"summary":7672},"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fdebye-einstein-heat-capacity","Thermal Properties — Einstein and Debye Models","The lattice heat capacity follows the classical Dulong-Petit value at high temperature but collapses toward zero as T approaches zero, a purely quantum effect. This lesson derives that behavior from the Einstein model of a single frequency, then the Debye model of a linear phonon spectrum with a cutoff, obtaining the Debye T-cubed law at low temperature and the Debye interpolation across all temperatures, and closes with thermal expansion and the Gruneisen parameter.\n",{"path":7674,"title":7675,"module":7663,"summary":7676},"\u002Fcondensed-matter\u002Flattice-dynamics\u002Fanharmonicity-and-thermal-transport","Anharmonicity, Thermal Expansion, and Heat Conduction","A perfectly harmonic crystal neither expands when heated nor resists heat flow. Both effects come from the cubic and higher terms the harmonic approximation discards. This lesson derives thermal expansion from an asymmetric interatomic potential, treats phonon-phonon scattering as the decay channel these terms open, shows why Umklapp processes are what make lattice thermal conductivity finite, and traces the temperature dependence of the conductivity and the phonon mean free path.\n",{"path":7678,"title":7679,"module":7680,"summary":7681},"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Ffree-electron-gas-and-conduction","Conduction and the Free-Electron Gas","Free-Electron Fermi Gas","Drude's classical free-electron model gets Ohm's law right but the resistivity, its temperature dependence, and the heat capacity wrong. Replacing the Maxwell-Boltzmann distribution with the Fermi-Dirac distribution and treating electron-lattice collisions as wave scattering repairs all three: the Fermi energy, Fermi speed, and a mean free path set by thermal lattice vibrations.\n",{"path":7683,"title":7684,"module":7680,"summary":7685},"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Fsommerfeld-model-and-heat-capacity","The Sommerfeld Model: Ground State and Heat Capacity","Quantizing the free-electron gas in a box fills a Fermi sphere in k-space. The density of states grows as the square root of energy in three dimensions, and the Fermi energy, temperature, and wavevector follow for real metals. The Sommerfeld expansion shows only a thermal shell of width k_BT near E_F is excited, giving an electronic heat capacity linear in T that sits beneath the phonon T-cubed term.\n",{"path":7687,"title":7688,"module":7680,"summary":7689},"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Ftransport-and-the-hall-effect","Transport, Wiedemann–Franz, and the Hall Effect","The relaxation-time picture displaces the Fermi sphere under an applied field and gives the electrical conductivity ne-squared-tau over m. The same electrons carry heat, and their ratio yields the Wiedemann–Franz law with the universal Lorenz number. A magnetic field bends the carriers into cyclotron orbits and produces the Hall voltage, whose sign reveals the charge of the carriers.\n",{"path":7691,"title":7692,"module":7680,"summary":7693},"\u002Fcondensed-matter\u002Ffree-electron-fermi-gas\u002Fscreening-and-plasmons","Screening, Plasmons, and the Limits of Free Electrons","A mobile electron gas rearranges to screen any foreign charge, turning the bare Coulomb potential into a short-ranged Yukawa form over the Thomas–Fermi length. Displaced collectively, the gas rings at the plasma frequency, whose quantum is the plasmon and whose value sets the reflectivity edge of metals. A ledger of free-electron successes and failures then motivates band theory.\n",{"path":7695,"title":7696,"module":7697,"summary":7698},"\u002Fcondensed-matter\u002Fband-theory\u002Fblochs-theorem-and-energy-bands","Bloch's Theorem and Energy Bands","Band Theory","An electron in a periodic potential has stationary states that are plane waves modulated by a lattice-periodic envelope. This lesson proves Bloch's theorem two ways, defines crystal momentum and the band index, counts the allowed wavevectors from Born–von Kármán boundary conditions, and sets up the extended, reduced, and repeated-zone descriptions of a band.\n",{"path":7700,"title":7701,"module":7697,"summary":7702},"\u002Fcondensed-matter\u002Fband-theory\u002Fnearly-free-electron-model","The Nearly-Free-Electron Model","A weak periodic potential leaves the free-electron parabola almost intact except near Brillouin-zone boundaries, where two nearly degenerate plane waves mix. This lesson solves the resulting two-by-two secular problem, shows the gap of size twice the potential component opening at each boundary, identifies the two standing waves that pile charge on and between the ions, and works the exactly solvable Kronig–Penney model.\n",{"path":7704,"title":7705,"module":7697,"summary":7706},"\u002Fcondensed-matter\u002Fband-theory\u002Ftight-binding-method","The Tight-Binding Method","The opposite limit to nearly-free electrons builds bands from atomic orbitals. A Bloch sum of one orbital per site gives a dispersion set by the hopping integral between neighbours; the band widens from a sharp atomic level as the atoms approach. This lesson derives the s-band cosine dispersion, extends it to p-bands, and introduces Wannier functions as the localized dual of Bloch states.\n",{"path":7708,"title":7709,"module":7697,"summary":7710},"\u002Fcondensed-matter\u002Fband-theory\u002Ffermi-surfaces-and-semiclassical-dynamics","Fermi Surfaces, Effective Mass, and Metals vs Insulators","Filling the bands settles which crystals conduct. A filled band carries no current, so a crystal with filled bands and a gap is an insulator, while a partly filled band makes a metal. This lesson derives the no-current theorem for a filled band, defines the Fermi surface and Harrison's construction, introduces holes and the effective mass from band curvature, and states the semiclassical equations of motion that lead to Bloch oscillations.\n",{"path":7712,"title":7713,"module":7714,"summary":7715},"\u002Fcondensed-matter\u002Fsemiconductors\u002Fsemiconductor-bands-and-junctions","Band Theory and Semiconductors","Semiconductors","The periodic lattice splits atomic levels into allowed energy bands separated by forbidden gaps. Whether the highest occupied band is full or partly full, and how wide the gap above it is, sorts every solid into conductor, insulator, or semiconductor. Doping adds donor or acceptor levels inside the gap, and a p-n junction built from doped regions gives the diode, the solar cell, the LED, and the transistor.\n",{"path":7717,"title":7718,"module":7714,"summary":7719},"\u002Fcondensed-matter\u002Fsemiconductors\u002Fintrinsic-and-extrinsic-semiconductors","Carrier Statistics: Intrinsic and Extrinsic Semiconductors","The number of mobile electrons and holes in a semiconductor follows from the density of states near each band edge and the Fermi-Dirac tail that reaches into it. This lesson derives the effective densities of states, the intrinsic concentration and its exponential gap dependence, the law of mass action, the temperature march of the Fermi level, and the freeze-out, saturation, and intrinsic regimes of a doped crystal.\n",{"path":7721,"title":7722,"module":7714,"summary":7723},"\u002Fcondensed-matter\u002Fsemiconductors\u002Fcarrier-transport-and-recombination","Carrier Transport and Recombination","Carriers move by drift in a field and by diffusion down a concentration gradient, the two tied together by the Einstein relation. This lesson derives mobility and its scattering-limited temperature dependence, the drift and diffusion currents, the continuity equations, band-to-band and trap-assisted recombination, and the minority-carrier lifetime and diffusion length that set the length scale of every junction device.\n",{"path":7725,"title":7726,"module":7714,"summary":7727},"\u002Fcondensed-matter\u002Fsemiconductors\u002Fthe-pn-junction","The p-n Junction in Depth","Joining p-type and n-type silicon aligns their Fermi levels and leaves a depletion region of fixed charge with a built-in potential. This lesson derives the space-charge field and potential from Poisson's equation in the depletion approximation, the built-in voltage from Fermi-level alignment, the Shockley diode equation from minority-carrier diffusion, junction and diffusion capacitance, and the avalanche and Zener breakdown mechanisms.\n",{"path":7729,"title":7730,"module":7714,"summary":7731},"\u002Fcondensed-matter\u002Fsemiconductors\u002Ftransistors-and-optoelectronics","Transistors and Optoelectronic Devices","Two junctions in series make a bipolar transistor whose thin base gives current gain; a gate over an oxide makes a MOSFET whose inversion channel switches digital logic. Run in reverse, a junction converts photons to current. This lesson derives the transistor current gain and the MOSFET channel current, then treats the LED, the diode laser, and the illuminated solar-cell characteristic.\n",{"path":7733,"title":7734,"module":7735,"summary":7736},"\u002Fcondensed-matter\u002Fdielectrics-and-ferroelectrics\u002Fdielectrics-and-polarization","Dielectrics, Polarization, and the Local Field","Dielectrics and Ferroelectrics","An insulator responds to an electric field by polarizing. This lesson builds the macroscopic polarization and the dielectric constant, sorts the microscopic response into electronic, ionic, and orientational polarizability, and corrects the field an atom actually feels to the Lorentz local field E + P\u002F3 epsilon-0. The Clausius-Mossotti relation links the measured permittivity to the atomic polarizability, and the frequency dependence of each mechanism explains why the static and optical dielectric constants differ.\n",{"path":7738,"title":7739,"module":7735,"summary":7740},"\u002Fcondensed-matter\u002Fdielectrics-and-ferroelectrics\u002Fferroelectrics-and-piezoelectrics","Ferroelectrics, Piezoelectrics, and Structural Transitions","Some crystals carry a polarization with no applied field and switch it under a reversing field, tracing a hysteresis loop. This lesson develops the ferroelectric transition through the perovskite BaTiO3 displacive instability and its soft transverse-optical mode, builds the Landau free-energy theory of first- and second-order polar transitions, derives the Curie-Weiss divergence of the dielectric constant, and closes with piezoelectricity and pyroelectricity and their devices.\n",{"path":7742,"title":7743,"module":7744,"summary":7745},"\u002Fcondensed-matter\u002Fmagnetism\u002Fdiamagnetism-and-paramagnetism","Diamagnetism and Paramagnetism","Magnetism in Solids","Every solid responds to a magnetic field. Filled shells give a small negative diamagnetic susceptibility from induced Larmor currents; localized moments give a positive Curie paramagnetism described by the Brillouin function, with the ground-state moment fixed by Hund's rules. The conduction electrons add a temperature-independent Pauli paramagnetism from the thermal shell near the Fermi surface, partly cancelled by Landau diamagnetism of their orbital motion.\n",{"path":7747,"title":7748,"module":7744,"summary":7749},"\u002Fcondensed-matter\u002Fmagnetism\u002Fexchange-and-ferromagnetism","Exchange and Ferromagnetism","Magnetic ordering at hundreds of kelvin cannot be dipolar; it is an exchange effect, the Coulomb repulsion sorted by the Pauli principle into a spin-dependent energy captured by the Heisenberg Hamiltonian. Weiss molecular-field theory replaces the exchange field by an average proportional to the magnetization, giving a self-consistent equation whose solution is spontaneous magnetization below a Curie temperature and a Curie–Weiss susceptibility above it. Itinerant ferromagnetism follows from the Stoner criterion on the band density of states.\n",{"path":7751,"title":7752,"module":7744,"summary":7753},"\u002Fcondensed-matter\u002Fmagnetism\u002Fantiferromagnetism-and-domains","Antiferromagnetism, Ferrimagnetism, and Domains","A negative exchange coupling orders neighboring spins antiparallel. Two-sublattice molecular-field theory gives a Néel temperature marked by a cusp in the susceptibility, and unequal sublattices leave a net moment — ferrimagnetism, the magnetism of the ferrites. A ferromagnet breaks into domains to reduce its magnetostatic energy, separated by Bloch walls whose width is set by the competition between exchange and magnetocrystalline anisotropy, and the irreversible motion of those walls produces the hysteresis loop.\n",{"path":7755,"title":7756,"module":7744,"summary":7757},"\u002Fcondensed-matter\u002Fmagnetism\u002Fspin-waves-and-magnons","Spin Waves and Magnons","The lowest excitations of a ferromagnet are not single flipped spins but collective precessions in which every moment tips slightly and its phase advances along the crystal. These spin waves have a quadratic dispersion at long wavelength, quantize into magnons obeying Bose statistics, and their thermal population removes magnetization as the Bloch T-to-the-three-halves law. Antiferromagnetic magnons disperse linearly, and inelastic neutron scattering measures both.\n",{"path":7759,"title":7760,"module":7761,"summary":7762},"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fsuperconductivity-phenomenology","Superconductivity: Phenomenology and BCS","Superconductivity","Below a critical temperature some materials lose all resistance and expel magnetic flux — the Meissner effect that defines the state. The isotope effect points to lattice vibrations, and BCS theory binds electrons into Cooper pairs through phonon exchange. The paired condensate opens an energy gap, quantizes magnetic flux, and drives the Josephson effects.\n",{"path":7764,"title":7765,"module":7761,"summary":7766},"\u002Fcondensed-matter\u002Fsuperconductivity\u002Flondon-theory-and-the-meissner-effect","London Theory and the Meissner Effect","A perfect conductor freezes the field it was cooled in; a superconductor expels it. The distinction needs a constitutive law beyond zero resistance — the two London equations — whose solution is exponential flux decay over the penetration depth. The same rigidity follows from a macroscopic condensate wave function, and the thermodynamics of the critical field fixes the condensation energy, the latent heat, and the specific-heat jump.\n",{"path":7768,"title":7769,"module":7761,"summary":7770},"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fginzburg-landau-theory","Ginzburg–Landau Theory, Vortices, and Type-II","A complex order parameter and a free-energy expansion turn the superconducting transition into a Landau theory. Two lengths emerge — the coherence length and the penetration depth — whose ratio kappa sorts superconductors into type I and type II. Type-II materials admit flux as an Abrikosov lattice of vortices, each threading exactly one quantum h\u002F2e, between a lower and an upper critical field.\n",{"path":7772,"title":7773,"module":7761,"summary":7774},"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fbcs-theory","Microscopic BCS Theory","A phonon-mediated attraction, however weak, binds two electrons above the Fermi sea — the Cooper problem shows the sea is unstable. The BCS variational ground state pairs all electrons near the Fermi surface and, through a self-consistent gap equation, opens an energy gap. Weak-coupling solution gives the exponential T_c and the universal ratios 2 Delta(0) = 3.53 k_B T_c and Delta C \u002F C_n = 1.43.\n",{"path":7776,"title":7777,"module":7761,"summary":7778},"\u002Fcondensed-matter\u002Fsuperconductivity\u002Fjosephson-and-high-tc","Josephson Effects and Unconventional Superconductors","Two superconductors joined by a thin barrier carry a supercurrent set by their phase difference — the dc Josephson effect — and oscillate at 2eV\u002Fh under a voltage. A two-junction loop turns flux quantization into a magnetometer of single-quantum sensitivity. The cuprates superconduct in CuO2 planes with a doping-dependent dome, d-wave pairing, and a pseudogap that lie outside the phonon picture.\n",{"path":7780,"title":7781,"module":7782,"summary":7783},"\u002Fcondensed-matter\u002Fnanostructures\u002Fquantum-wells-wires-and-dots","Quantum Wells, Wires, and Dots","Nanostructures","When a crystal is shrunk until one or more of its dimensions approaches the electron wavelength, the continuous bands of the bulk break into discrete subbands. Confining in one direction gives a quantum well with a step-like density of states, in two directions a quantum wire with inverse-square-root singularities, and in all three a quantum dot whose levels are sharp like an atom's. This lesson derives the density of states in each case and applies it to size-tunable dot emission and the Coulomb blockade of a single-electron transistor.\n",{"path":7785,"title":7786,"module":7782,"summary":7787},"\u002Fcondensed-matter\u002Fnanostructures\u002Finteger-quantum-hall-effect","The 2D Electron Gas and the Integer Quantum Hall Effect","A two-dimensional electron gas in a strong perpendicular magnetic field has its continuous density of states collapse into macroscopically degenerate Landau levels. As the field is swept, the Hall resistance locks onto exact plateaus at h over an integer times e squared, while the longitudinal resistance drops to zero. This lesson derives the Landau levels and their degeneracy, explains the plateaus through disorder-localized states and current-carrying edge channels, and states why the von Klitzing constant is now a resistance standard.\n",{"path":7789,"title":7790,"module":7782,"summary":7791},"\u002Fcondensed-matter\u002Fnanostructures\u002Ffractional-quantum-hall-and-topology","The Fractional Quantum Hall Effect and Topological Order","When the lowest Landau level is only partly filled, the non-interacting theory predicts no gap, yet a plateau appears at filling one-third. It is a many-body effect: Coulomb repulsion selects a correlated ground state, the Laughlin wavefunction, whose excitations carry a fraction of the electron charge. This lesson builds the Laughlin state, introduces composite fermions that map the fractional effect onto an integer one, and explains how the quantum Hall effect brought the Chern number and topology into condensed-matter physics.\n",{"path":7793,"title":7794,"module":7782,"summary":7795},"\u002Fcondensed-matter\u002Fnanostructures\u002Fgraphene-and-dirac-materials","Graphene and Dirac Materials","Graphene is one atomic layer of carbon on a honeycomb lattice. A tight-binding calculation on its two-atom basis gives valence and conduction bands that touch at the corners of the Brillouin zone, where the dispersion is linear and the electrons behave as massless two-dimensional Dirac particles with a fixed speed. This lesson derives the Dirac cones, the Berry phase of pi and the sublattice chirality, the anomalous half-integer quantum Hall effect that follows, and how opening a gap in a Dirac cone points toward topological insulators.\n",{"path":7797,"title":7798,"module":6,"summary":6},"\u002Fcondensed-matter","Condensed Matter Physics",{"path":7800,"title":7801,"module":3628,"summary":7802},"\u002Flogic\u002Ffoundations\u002Flogic-as-a-mathematical-model","Logic as a Mathematical Model of Deduction","Symbolic logic models deductive reasoning the way probability theory models chance: it keeps the form of a correct deduction and discards its content. A deduction is valid when its conclusion follows from the form of the premises alone, independent of what the non-logical words mean. Two models carry the subject — coarse sentential logic and fine first-order logic — and four questions organize it: logical consequence, methods of proof, the gap between provable and true, and the link between logic and computability. Tuples, relations, functions, equivalence classes, and cardinality supply the set-theoretic vocabulary every later chapter uses.\n",{"path":7804,"title":7805,"module":7806,"summary":7807},"\u002Flogic\u002Fsentential-logic\u002Fformal-languages-and-well-formed-formulas","Formal Languages and Well-Formed Formulas","Sentential Logic","The language of sentential logic has an alphabet of sentence symbols, five connectives, and two parentheses, with formation rules that pick out the well-formed formulas. The wffs are the least set of expressions closed under the five formula-building operations, and every such generated set carries an induction principle.\n",{"path":7809,"title":7810,"module":7806,"summary":7811},"\u002Flogic\u002Fsentential-logic\u002Ftruth-assignments-and-tautologies","Truth Assignments, Tautologies, and Consequence","A truth assignment fixes the sentence symbols true or false, and a recursion extends it uniquely to every formula. Satisfaction, tautologies, and tautological implication — one formula following semantically from others — rest on that extension, and the truth-table procedure decides implication for finite premise sets.\n",{"path":7813,"title":7814,"module":7806,"summary":7815},"\u002Flogic\u002Fsentential-logic\u002Funique-readability-and-parsing","Unique Readability and a Parsing Algorithm","Parentheses keep a formula from being read two ways. The parenthesis lemmas and a top-down parsing algorithm recover a formula's structure and yield unique readability: every wff has exactly one formation tree, which is what makes the truth recursion well defined.\n",{"path":7817,"title":7818,"module":7806,"summary":7819},"\u002Flogic\u002Fsentential-logic\u002Finduction-and-recursion","Induction and Recursion on Formulas","Two principles govern any set generated from initial elements by operations: prove a property of all its members by covering the initial elements and the closure steps, and define a function on it by recursion on structure. The recursion theorem needs the set to be freely generated, and unique readability supplies that condition for the well-formed formulas.\n",{"path":7821,"title":7822,"module":7806,"summary":7823},"\u002Flogic\u002Fsentential-logic\u002Fexpressive-completeness-and-normal-forms","Sentential Connectives and Normal Forms","Every formula computes a Boolean function of its atoms, and Post's theorem gives the converse: every Boolean function is realized by a wff in disjunctive normal form, so the five connectives are more than enough. Minimal complete sets follow, down to the single connectives NAND and NOR, together with a method for proving a set of connectives incomplete.\n",{"path":7825,"title":7826,"module":7806,"summary":7827},"\u002Flogic\u002Fsentential-logic\u002Fboolean-circuits","Switching Circuits","A memoryless two-valued circuit computes a Boolean function, so every formula names a gate network and every network a formula. Cost and delay are read off the formula by recursion, and tautological equivalence and normal forms design and simplify circuits realizing a given specification.\n",{"path":7829,"title":7830,"module":7806,"summary":7831},"\u002Flogic\u002Fsentential-logic\u002Fcompactness-and-effectiveness","Compactness and Effectiveness","The compactness theorem reduces satisfiability of an infinite set of formulas to its finite subsets, proved by extension to a maximal finitely satisfiable set and applied to color infinite graphs. Effectiveness fixes what \"decidable\" and \"effectively enumerable\" mean and settles the decidability of tautologyhood.\n",{"path":7833,"title":7834,"module":7835,"summary":7836},"\u002Flogic\u002Ffirst-order-languages\u002Ffirst-order-languages","First-Order Languages","First-Order Languages and Structures","Sentential logic cannot see inside a simple statement, so it misses valid arguments that turn on quantifiers and predicates. A first-order language adds a quantifier, variables, and a chosen vocabulary of predicate, function, and constant symbols. Terms and well-formed formulas are built by recursion over this alphabet, and a variable occurs free or bound according to the quantifiers that reach it.\n",{"path":7838,"title":7839,"module":7835,"summary":7840},"\u002Flogic\u002Ffirst-order-languages\u002Fstructures-truth-and-satisfaction","Structures, Truth, and Satisfaction","A structure interprets a language: a nonempty universe plus a meaning for every predicate, function, and constant symbol. Tarski's recursion defines when a structure satisfies a formula under a variable assignment, and hence when a sentence is true. From satisfaction we recover logical implication, validity, and logical equivalence for first-order logic.\n",{"path":7842,"title":7843,"module":7835,"summary":7844},"\u002Flogic\u002Ffirst-order-languages\u002Fdefinability-and-elementary-equivalence","Definability and Elementary Equivalence","Fix a structure and ask which relations a formula can pick out: the definable ones. A set of sentences picks out a class of structures, the elementary classes. Homomorphisms and isomorphisms compare structures, and the homomorphism theorem shows isomorphic structures satisfy the same sentences. Automorphisms bound what first-order logic can distinguish, giving a tool for proving relations undefinable.\n",{"path":7846,"title":7847,"module":7835,"summary":7848},"\u002Flogic\u002Ffirst-order-languages\u002Fterms-substitution-and-parsing","Parsing, Substitution, and Substitutability","Every recursion on first-order syntax rests on unique readability. A parenthesis-counting function proves that terms and formulas decompose in exactly one way, and a parsing algorithm recovers the decomposition. Substituting a term for a free variable can capture it under a quantifier; the substitutability condition rules that out, and the substitution lemma trades syntactic substitution for a change of assignment.\n",{"path":7850,"title":7851,"module":7852,"summary":7853},"\u002Flogic\u002Fdeductive-calculus\u002Fa-deductive-calculus","A Deductive Calculus for First-Order Logic","The Deductive Calculus and Its Metatheorems","A proof must be finite and mechanically checkable. A Hilbert-style calculus meets both demands: six schemas of logical axioms, a single rule of inference (modus ponens), and the syntactic consequence relation they generate. Substitution and substitutability are defined by recursion, and the bridge theorem reduces deducibility to tautological implication from the axioms.\n",{"path":7855,"title":7856,"module":7852,"summary":7857},"\u002Flogic\u002Fdeductive-calculus\u002Fdeduction-theorem-and-derived-rules","The Deduction Theorem and Derived Rules","Raw deductions from axioms are unusable by hand. The generalization theorem, the deduction theorem, contraposition, reductio ad absurdum, and rule T reduce the calculus to the moves of ordinary mathematics, each proved once to license a block of axiom-level steps. Generalization on constants and alphabetic variants handle the quantifier and substitution bookkeeping.\n",{"path":7859,"title":7860,"module":7852,"summary":7861},"\u002Flogic\u002Fdeductive-calculus\u002Fsoundness","The Soundness Theorem","Soundness is the easy half of the match between proof and truth. Whatever the calculus deduces is logically implied, by an induction on deduction length that rests on one lemma: every logical axiom is valid. The only hard case, quantifier instantiation, needs the substitution lemma. The contrapositive corollary states that every satisfiable set is consistent.\n",{"path":7863,"title":7864,"module":7852,"summary":7865},"\u002Flogic\u002Fdeductive-calculus\u002Fcompleteness-and-consistency","The Completeness Theorem","Gödel's completeness theorem is the deep converse of soundness: whatever is logically implied can be deduced. Equivalently, every consistent set has a model. The Henkin proof manufactures that model out of syntax alone: add witnessing constants, extend to a maximal consistent set, and read a term model off the formulas it contains. Compactness and the enumerability theorem drop out.\n",{"path":7867,"title":7868,"module":7869,"summary":7870},"\u002Flogic\u002Fmodels-and-theories\u002Fcompactness-and-lowenheim-skolem","Compactness and the Löwenheim–Skolem Theorems","Models, Compactness, and Theories","A set of first-order sentences has a model whenever each of its finite subsets does. This compactness theorem follows from completeness and yields the finiteness limitation, the downward and upward Löwenheim–Skolem theorems, models of every infinite cardinality, and nonstandard models of arithmetic.\n",{"path":7872,"title":7873,"module":7869,"summary":7874},"\u002Flogic\u002Fmodels-and-theories\u002Ftheories-elementary-classes-and-categoricity","Theories, Elementary Classes, and Categoricity","A theory is a set of sentences closed under logical consequence. Theories correspond to classes of models; a theory may be complete, axiomatizable, or finitely axiomatizable, and completeness together with axiomatizability yields decidability. The Łoś–Vaught test derives completeness from categoricity in a cardinal, applied to dense linear orders and to algebraically closed fields.\n",{"path":7876,"title":7877,"module":7869,"summary":7878},"\u002Flogic\u002Fmodels-and-theories\u002Finterpretations-between-theories","Interpretations Between Theories","An interpretation translates the vocabulary of one theory into formulas of another, relativizing quantifiers to a definable domain and mapping symbols to defining formulas. Defined function symbols meet a noncreativity criterion; the syntactic translation of formulas carries theoremhood forward, and a faithful interpretation transfers decidability and undecidability between theories.\n",{"path":7880,"title":7881,"module":7869,"summary":7882},"\u002Flogic\u002Fmodels-and-theories\u002Fnonstandard-analysis","Nonstandard Analysis","Compactness builds a model of the real ordered field containing infinite elements and nonzero infinitesimals. The transfer principle carries every first-order truth from the reals to this extension, the standard-part map collapses finite hyperreals back onto the reals, and continuity and the derivative are rederived by working with infinitely small quantities directly.\n",{"path":7884,"title":7885,"module":7886,"summary":7887},"\u002Flogic\u002Farithmetic-and-definability\u002Fdefinability-in-arithmetic","The Structure of Arithmetic and Definability","Number Theory and Definability","Number theory is the theory of one fixed structure, the natural numbers under successor, order, addition, multiplication, and exponentiation. Every number is named by a numeral, and a relation is definable when a single formula picks out exactly its tuples. The central gap separates the sentences true in that structure from those any reasonable set of axioms can prove.\n",{"path":7889,"title":7890,"module":7886,"summary":7891},"\u002Flogic\u002Farithmetic-and-definability\u002Fnatural-numbers-with-successor","Natural Numbers with Successor","The weakest reduct keeps only zero and successor. Its models are a standard chain together with disjoint copies of the integers, which makes the theory categorical in every uncountable power, hence complete and decidable. A quantifier-elimination procedure gives a practical decision method and shows a subset is definable if and only if it is finite or cofinite.\n",{"path":7893,"title":7894,"module":7886,"summary":7895},"\u002Flogic\u002Farithmetic-and-definability\u002Fpresburger-and-reducts","Reducts: Order, Addition, and Multiplication","Adding order to the successor reduct keeps decidability and makes the theory finitely axiomatizable; adding addition gives Presburger arithmetic, still decidable by quantifier elimination once congruence predicates are included, with definable sets exactly the eventually periodic ones. Multiplication is the break point: neither addition nor order can define it, and once it joins addition the theory stops being decidable.\n",{"path":7897,"title":7898,"module":7886,"summary":7899},"\u002Flogic\u002Farithmetic-and-definability\u002Fa-subtheory-and-representability","A Subtheory of Number Theory and Representability","A finite set of eleven axioms, the recursion equations for successor, order, addition, multiplication, and exponentiation, already proves every true quantifier-free and existential sentence. Representability asks a theory to prove the right instances of a formula rather than merely make them true, and a relation is defined to be recursive exactly when some consistent finite theory represents it. Church's thesis identifies that with decidability, and closure under composition, minimization, and primitive recursion builds the catalog the incompleteness proofs need.\n",{"path":7901,"title":7902,"module":7903,"summary":7904},"\u002Flogic\u002Fincompleteness\u002Farithmetization-of-syntax","Arithmetization of Syntax","Arithmetization and the Incompleteness Theorems","Gödel numbering assigns a natural number to every symbol, expression, formula, and deduction, turning statements about syntax into statements about numbers. The syntactic operations — substitution, \"is a wff\", \"is an axiom\", \"d codes a deduction of a\" — come out primitive recursive and hence representable in the subtheory, which lets a formula of arithmetic talk about formulas, including itself.\n",{"path":7906,"title":7907,"module":7903,"summary":7908},"\u002Flogic\u002Fincompleteness\u002Fincompleteness-and-undecidability","Incompleteness, Undecidability, and Church's Theorem","The fixed-point lemma manufactures a sentence that talks about its own Gödel number. Pointed at truth it gives Tarski's theorem — arithmetic truth is not arithmetically definable; pointed at provability it gives Gödel's first incompleteness theorem and the undecidability of the theory of the natural numbers, and, applied to validity, Church's theorem that first-order logic is undecidable. The set of theorems of a recursive theory is only recursively enumerable — the gap between provable and true.\n",{"path":7910,"title":7911,"module":7903,"summary":7912},"\u002Flogic\u002Fincompleteness\u002Fsecond-incompleteness-theorem","The Second Incompleteness Theorem","Consistency of a recursively axiomatized theory is itself an arithmetic sentence, built from a provability predicate. When the theory is strong enough to formalize its own reflection and modus ponens — the Hilbert–Bernays–Löb derivability conditions — it cannot prove that sentence unless it is inconsistent. Löb's theorem is the companion result, and set theory is the case that closes Hilbert's program.\n",{"path":7914,"title":7915,"module":7916,"summary":7917},"\u002Flogic\u002Fcomputability-and-representability\u002Frecursive-functions","Recursive Functions and Church's Thesis","Recursive Functions and Representability","The recursive functions are the formal counterpart of the effectively computable ones: built from three initial functions by composition, primitive recursion, and minimization, and equivalently the functions representable in a finitely axiomatized arithmetic. Church's thesis identifies the class with effective calculability; Kleene's normal form theorem and the unsolvable halting problem place the recursive sets strictly inside the recursively enumerable ones.\n",{"path":7919,"title":7920,"module":7916,"summary":7921},"\u002Flogic\u002Fcomputability-and-representability\u002Frepresenting-exponentiation","Representing Exponentiation and the β-Function","Coding finite sequences by prime-power exponents already assumes exponentiation, so representing exponentiation from addition and multiplication alone needs a different encoder. Gödel's β-function, built from a pairing function and the Chinese remainder theorem, reads back arbitrary finite sequences using only plus and times. This represents exponentiation in the addition-multiplication arithmetic and closes the last gap in the representability of every recursive syntactic operation.\n",{"path":7923,"title":7924,"module":7925,"summary":7926},"\u002Flogic\u002Fsecond-order-logic\u002Fsecond-order-languages","Second-Order Languages","Second-Order Logic and Beyond","Second-order logic quantifies over relations and functions, not just individuals. Second-order Peano arithmetic and the second-order theory of the reals become categorical, and finiteness is definable by a single sentence. Compactness, completeness, and the Löwenheim–Skolem theorems all fail for the standard semantics.\n",{"path":7928,"title":7929,"module":7925,"summary":7930},"\u002Flogic\u002Fsecond-order-logic\u002Fskolem-functions-and-many-sorted-logic","Skolem Functions and Many-Sorted Logic","Skolem functions replace existential quantifiers with named witnesses, putting any first-order formula into a prenex form with all existentials — now over functions — pulled to the front. The Skolemized formula is equisatisfiable with the original, which reduces satisfiability to universal sentences and, through Herbrand expansions, to sentential logic. Many-sorted logic then adds several universes at once and reduces cleanly to ordinary one-sorted logic.\n",{"path":7932,"title":7933,"module":7925,"summary":7934},"\u002Flogic\u002Fsecond-order-logic\u002Fgeneral-structures","General (Henkin) Structures","General semantics reinterprets second-order logic by letting the predicate and function quantifiers range over a designated collection of relations and functions rather than all of them. Recast as many-sorted first-order logic with comprehension axioms, general second-order logic recovers a sound and complete calculus together with compactness and Löwenheim–Skolem, giving up the categoricity of the standard semantics. The ω-models of analysis show the trade.\n",{"path":7936,"title":7937,"module":6,"summary":6},"\u002Flogic","Logic",{"path":7939,"title":7940,"module":3628,"summary":7941},"\u002Freinforcement-learning\u002Ffoundations\u002Fwhat-is-reinforcement-learning","What Is Reinforcement Learning?","Reinforcement learning is learning what to do — how to map situations to actions — so as to maximize a numerical reward signal, discovered by trial and error rather than told. We set up the agent–environment loop, separate it from supervised and unsupervised learning, name the four elements (policy, reward, value, and an optional model), and train a tic-tac-toe player with a temporal-difference value update.\n",{"path":7943,"title":7944,"module":3628,"summary":7945},"\u002Freinforcement-learning\u002Ffoundations\u002Fa-brief-history-of-rl","A Brief History of Reinforcement Learning","The origins of reinforcement learning. Three threads — trial-and-error learning from animal psychology, optimal control and dynamic programming, and temporal-difference learning — ran independently for decades and merged around 1989 into the modern field. Replacing the lookup table with a neural network then produced deep reinforcement learning: DQN, AlphaGo, AlphaZero, MuZero, and RLHF.\n",{"path":7947,"title":7948,"module":3628,"summary":7949},"\u002Freinforcement-learning\u002Ffoundations\u002Fmulti-armed-bandits","Multi-Armed Bandits","A bandit is reinforcement learning stripped to a single decision, repeated: no state, no consequences, only the tension between exploiting the arm that looks best and exploring the ones that might be better. We build up the whole toolkit — sample-average value estimates, the incremental update rule, ε-greedy, optimistic initialization, UCB, and gradient bandits — and use it to study exploration in isolation, the one problem that carries over to the full setting.\n",{"path":7951,"title":7952,"module":3628,"summary":7953},"\u002Freinforcement-learning\u002Ffoundations\u002Fbandit-exploration-algorithms","Bandit Exploration Algorithms","Better ways to explore than picking at random. Upper-confidence-bound selection explores by optimism about what it hasn't measured; gradient bandits learn action preferences by stochastic gradient ascent on reward. We then add context to get the contextual bandit, the bridge to full RL, and measure everything by regret — where UCB1 and Thompson sampling reach the logarithmic optimum that fixed-ε greedy cannot.\n",{"path":7955,"title":7956,"module":3628,"summary":7957},"\u002Freinforcement-learning\u002Ffoundations\u002Fmarkov-decision-processes","Markov Decision Processes","A Markov decision process is the formal interface between an agent and its environment: at each step the agent reads a state, chooses an action, and receives a reward and a next state. We fix that loop, the dynamics function that governs it, and the Markov property that makes the state sufficient; then turn goals into a scalar reward and rewards into a discounted return, with one notation that covers both episodic and continuing tasks.\n",{"path":7959,"title":7960,"module":3628,"summary":7961},"\u002Freinforcement-learning\u002Ffoundations\u002Fvalue-functions-and-optimality","Value Functions and Optimality","A value function scores how good a state (or state–action pair) is under a policy: the expected return from there onward. Its defining property is the Bellman equation, a self-consistency condition linking a state's value to its successors' values, which we derive from the return and the dynamics. Pushing the same idea to the best-achievable value gives the Bellman optimality equations, whose solution yields an optimal policy — and whose intractability is what the rest of the course is about.\n",{"path":7963,"title":4783,"module":7964,"summary":7965},"\u002Freinforcement-learning\u002Ftabular-methods\u002Fdynamic-programming","Tabular Solution Methods","Dynamic programming computes optimal policies when a perfect model of the MDP is given, by turning the Bellman equations into assignment statements. We build up iterative policy evaluation (the expected update), the policy improvement theorem, and the two classic algorithms that alternate them — policy iteration and value iteration — worked on the gridworld, a two-state MDP, Jack's car rental, and the gambler's problem.\n",{"path":7967,"title":7968,"module":7964,"summary":7969},"\u002Freinforcement-learning\u002Ftabular-methods\u002Fdp-async-and-gpi","Dynamic Programming: Asynchronous DP and Generalized Policy Iteration","Policy and value iteration both sweep the entire state set on every pass, which is impossible once the state space is huge. This lesson loosens the schedule: asynchronous DP updates states in any order, generalized policy iteration names the alternation of evaluation and improvement that underlies nearly every RL method, and a look at efficiency and the curse of dimensionality places DP among the alternatives. We close past Sutton & Barto with prioritized sweeping, neuro-dynamic programming, value-iteration networks, and MuZero.\n",{"path":7971,"title":7972,"module":7964,"summary":7973},"\u002Freinforcement-learning\u002Ftabular-methods\u002Fmonte-carlo-methods","Monte Carlo Methods","Monte Carlo methods learn value functions and optimal policies from complete sampled episodes, with no model of the environment: they simply average the returns that actually followed each state. We build prediction (first-visit and every-visit averaging), see why estimating action values forces the exploration question, and answer it two ways on-policy — exploring starts and epsilon-soft control. Throughout, Monte Carlo samples one whole trajectory to termination and never bootstraps.\n",{"path":7975,"title":7976,"module":7964,"summary":7977},"\u002Freinforcement-learning\u002Ftabular-methods\u002Fmonte-carlo-off-policy","Monte Carlo Methods: Off-Policy Learning","On-policy Monte Carlo can only reach the best exploring policy, not the true optimum. Off-policy methods remove that ceiling by learning about a greedy target policy from data generated by a soft behavior policy, corrected with importance sampling. We derive the importance-sampling ratio, weigh ordinary against weighted estimators on real numbers, give the incremental off-policy algorithm, sharpen it with discounting-aware sampling, and close by placing Monte Carlo on the model\u002Fbootstrap map beside DP and temporal-difference learning.\n",{"path":7979,"title":7980,"module":7964,"summary":7981},"\u002Freinforcement-learning\u002Ftabular-methods\u002Ftemporal-difference-learning","Temporal-Difference Learning","Temporal-difference learning is the one idea most central to reinforcement learning: learn a value directly from experience, like Monte Carlo, but update each guess toward the next guess before the episode ends, like dynamic programming. We derive the TD(0) prediction rule and its reward-prediction error, contrast its one-step backup with MC and DP, work the driving-home and random-walk examples, and show the batch-updating optimality that makes TD approximate the certainty-equivalence estimate.\n",{"path":7983,"title":7984,"module":7964,"summary":7985},"\u002Freinforcement-learning\u002Ftabular-methods\u002Ftd-control-sarsa-and-q-learning","TD Control: Sarsa, Q-learning, and Double Learning","With TD prediction in hand, control follows the generalized-policy-iteration pattern with TD as the evaluation step. We build Sarsa (on-policy), Q-learning (off-policy, targeting the optimal policy), and Expected Sarsa that spans the two, then confront the maximization bias every max-based method inherits and fix it with Double Q-learning. We close past Sutton & Barto, following each one-step tabular update into its deep-RL descendant — DQN, Double DQN, and Rainbow.\n",{"path":7987,"title":7988,"module":7964,"summary":7989},"\u002Freinforcement-learning\u002Ftabular-methods\u002Fn-step-bootstrapping","n-Step Bootstrapping","Monte Carlo waits for the full return; one-step TD bootstraps after a single reward. Between them lies a whole spectrum, indexed by one integer n: look ahead n real rewards, then bootstrap from the value n steps out. The n-step return unifies the previous two lessons, and — on the random walk — an intermediate n beats both extremes. We build the n-step return, the n-step TD update, the backup-diagram spectrum, and n-step Sarsa for control.\n",{"path":7991,"title":7992,"module":7964,"summary":7993},"\u002Freinforcement-learning\u002Ftabular-methods\u002Fn-step-off-policy-methods","n-Step Bootstrapping: Off-Policy Methods","Taking the n-step family off-policy raises the same importance-sampling questions Monte Carlo did, now over a window of exactly n actions. We reweight n-step returns by the policy ratio, watch the ratio product inflate variance on real numbers, then build the tree-backup algorithm that learns off-policy with no ratios at all — and finally n-step Q(sigma), one algorithm whose per-step switch recovers Sarsa, tree backup, and Expected Sarsa as special cases.\n",{"path":7995,"title":7996,"module":7964,"summary":7997},"\u002Freinforcement-learning\u002Ftabular-methods\u002Fplanning-and-learning","Planning and Learning","Planning and learning are the same operation run on two kinds of experience. A model turns states and actions into simulated transitions; planning backs up values over that simulated experience exactly as learning backs them up over real experience. We build the Dyna architecture that interleaves acting, model-learning, direct RL, and planning in one loop, trace a single Dyna-Q step by hand, and patch the architecture for when the model goes stale.\n",{"path":7999,"title":8000,"module":7964,"summary":8001},"\u002Freinforcement-learning\u002Ftabular-methods\u002Fplanning-focusing-and-decision-time","Planning: Focusing Updates and Decision-Time Search","Dyna plans by replaying remembered transitions, but sampling them uniformly wastes most of the effort. This lesson sharpens planning: prioritized sweeping works backward from states whose value just changed, expected versus sample updates weigh thoroughness against cost, and trajectory sampling and real-time DP focus updates on the states the policy actually visits. We trace Dyna forward to model-based deep RL, then turn to decision-time planning — heuristic search, rollouts, and Monte Carlo Tree Search.\n",{"path":8003,"title":8004,"module":7964,"summary":8005},"\u002Freinforcement-learning\u002Ftabular-methods\u002Fdecision-time-planning","Decision-Time Planning","Planning need not build a global policy. Decision-time planning runs a fresh lookahead every time a state arrives and returns just one action, then throws the work away. We start from real-time dynamic programming — asynchronous value iteration on the states the agent actually visits — then move through heuristic search and rollout algorithms, each a one-step policy improvement applied on the fly to the current state.\n",{"path":8007,"title":8008,"module":7964,"summary":8009},"\u002Freinforcement-learning\u002Ftabular-methods\u002Fmonte-carlo-tree-search","Monte Carlo Tree Search","Monte Carlo Tree Search is a rollout algorithm with memory: it accumulates value estimates across simulations and steers later ones toward promising branches. We work through the four steps — selection, expansion, simulation, backup — the UCT selection rule computed on real numbers, the asymmetric growing tree, and the full pseudocode. We close past Sutton & Barto with the lineage from UCT to AlphaGo, AlphaZero, and MuZero, where a learned network stands in for the leaf value and the rollout.\n",{"path":8011,"title":8012,"module":8013,"summary":8014},"\u002Freinforcement-learning\u002Fapproximation\u002Fon-policy-prediction","On-Policy Prediction with Approximation","Approximate Solution Methods","Every tabular method so far stored one number per state, which fails once the state space is large or continuous. We replace the table with a parameterized value function $\\hat v(s,\\mathbf{w})$, define the mean squared value error it should minimize under the on-policy distribution, and derive stochastic- and semi-gradient learning rules — the semi-gradient TD(0) update that bootstraps and so is not a true gradient. Linear methods make the analysis clean and give the TD fixed point; feature construction (polynomials, Fourier basis, coarse and tile coding, RBFs) supplies the vectors $\\mathbf{x}(s)$, and neural networks are the nonlinear bridge to deep RL.\n",{"path":8016,"title":8017,"module":8013,"summary":8018},"\u002Freinforcement-learning\u002Fapproximation\u002Ffeature-construction-and-nonlinear","Feature Construction and Nonlinear Approximation","Linear methods are only as good as the feature vectors $\\mathbf{x}(s)$ fed to them, and this lesson builds those vectors. Polynomials and the Fourier basis turn a state's coordinates into smooth global features; coarse coding, tile coding, and radial basis functions cover a continuous space with overlapping local receptive fields whose size sets the reach of generalization. Then we stop designing features by hand: a neural network learns the representation itself by gradient descent, trading the convergence guarantees of the linear case for expressiveness — the bridge to deep reinforcement learning.\n",{"path":8020,"title":8021,"module":8013,"summary":8022},"\u002Freinforcement-learning\u002Fapproximation\u002Fon-policy-control","On-Policy Control with Approximation","Prediction learned a value function from features; control learns to act. We carry semi-gradient methods over to action values $\\hat q(s,a,\\mathbf{w})$, giving episodic semi-gradient Sarsa and its n-step form, and solve Mountain Car by descending a cost-to-go surface. In the continuing case, function approximation makes discounting unable to affect which policy is best, so we replace it with the average-reward setting — the differential return, differential value functions, and differential semi-gradient Sarsa.\n",{"path":8024,"title":8025,"module":8013,"summary":8026},"\u002Freinforcement-learning\u002Fapproximation\u002Faverage-reward-control","Average-Reward Control for Continuing Tasks","With function approximation, discounting has no effect on a continuing task: averaged over the on-policy distribution, the discounted objective equals the average reward times a policy-independent constant, so $\\gamma$ cannot change which policy is best. This lesson replaces discounting with the average-reward setting — the long-run reward rate $r(\\pi)$, the differential return that measures each state's transient advantage over that rate, differential value functions and TD error, and differential semi-gradient Sarsa, the control method for continuing tasks that never invokes a discount factor.\n",{"path":8028,"title":8029,"module":8013,"summary":8030},"\u002Freinforcement-learning\u002Fapproximation\u002Foff-policy-and-the-deadly-triad","Off-Policy Methods and the Deadly Triad","Off-policy learning with function approximation is where the convergence guarantees of reinforcement learning fail. We extend the tabular off-policy updates to semi-gradient form with per-step importance sampling, show Baird's counterexample driving the weights to infinity, and identify the cause: the deadly triad of function approximation, bootstrapping, and off-policy training — any two are safe, all three can diverge. The divergence is not caused by sampling noise: a fully synchronous dynamic-programming update blows up just the same, which is what makes the triad a structural hazard rather than a fluke.\n",{"path":8032,"title":8033,"module":8013,"summary":8034},"\u002Freinforcement-learning\u002Fapproximation\u002Fbellman-error-and-gradient-td","Value-Function Geometry and Gradient-TD Methods","Why does the deadly triad diverge, and how do you stop it? This lesson develops the geometry that explains the failure: value functions as vectors, the projection operator onto the representable subspace, and the split between the Bellman error, the value error, and the projected Bellman error: the three objectives have different minimizers. The projected Bellman error is the learnable one, and Gradient-TD methods (GTD2, TDC) do true stochastic gradient descent on it, staying stable even off-policy at $O(d)$ cost. Emphatic TD reweights states instead, and a survey of variance-reduction techniques closes the gap between stability and usable learning.\n",{"path":8036,"title":8037,"module":8013,"summary":8038},"\u002Freinforcement-learning\u002Fapproximation\u002Feligibility-traces","Eligibility Traces","n-step methods unify TD and Monte Carlo by storing the last n feature vectors; eligibility traces do the same job with a single short-term memory vector. The λ-return averages every n-step return under a geometric weighting; the forward view looks ahead to that average, and the backward view produces nearly the same updates online through a decaying trace vector. We build the λ-return, TD(λ) with its trace, the two ways λ recovers TD(0) and Monte Carlo, a note on the exact equivalence of true online TD(λ), and Sarsa(λ) for control.\n",{"path":8040,"title":8041,"module":8013,"summary":8042},"\u002Freinforcement-learning\u002Fapproximation\u002Ftrue-online-and-sarsa-lambda","True Online TD(λ) and Sarsa(λ)","Plain TD(λ) makes the forward and backward views nearly agree; this lesson closes the gap. True online TD(λ) uses a dutch trace and a small correction term to produce exactly the same weight sequence as the online λ-return algorithm, at the same memory and only a constant factor more compute — the sharpest statement of the forward\u002Fbackward duality. The whole apparatus then lifts to control unchanged: Sarsa(λ) threads a single delayed reward back along an entire trajectory in one sweep, and the λ-weighting reappears in modern deep RL as generalized advantage estimation.\n",{"path":8044,"title":8045,"module":8013,"summary":8046},"\u002Freinforcement-learning\u002Fapproximation\u002Fpolicy-gradient-methods","Policy Gradient Methods","Every method so far learned values and read a policy off them. Policy gradient methods drop the intermediary: parameterize the policy directly and climb the performance gradient. We build the softmax-in-preferences parameterization, prove the policy gradient theorem that makes the gradient computable without the unknown state distribution, and derive REINFORCE and its variance-cutting state-value baseline — the launch point for the bootstrapping actor-critic that follows.\n",{"path":8048,"title":8049,"module":8013,"summary":8050},"\u002Freinforcement-learning\u002Fapproximation\u002Factor-critic-and-continuous-actions","Actor-Critic Methods and Continuous Actions","REINFORCE with a baseline learns a value function but never bootstraps; this lesson adds the bootstrapping critic that completes the actor-critic architecture. The critic scores each transition into a single TD error that steers both the actor's policy step and its own value step, trading a little bias for much lower variance and fully online, continuing-task learning. The policy gradient theorem carries over unchanged to the average-reward setting, a Gaussian policy handles real-valued actions with self-tuning exploration, and the natural policy gradient leads straight to TRPO, PPO, and the deep actor-critic methods that train today's agents.\n",{"path":8052,"title":8053,"module":8013,"summary":8054},"\u002Freinforcement-learning\u002Fapproximation\u002Fleast-squares-and-memory-based-methods","Least-Squares TD","Semi-gradient TD spends one cheap step per example and needs many examples; this lesson makes the opposite tradeoff. Least-Squares TD (LSTD) accumulates the matrices $\\mathbf{A}$ and $\\mathbf{b}$ and solves the TD fixed point $\\mathbf{w} = \\mathbf{A}^{-1}\\mathbf{b}$ directly, using the Sherman-Morrison identity to maintain the inverse in $O(d^2)$ — the most data-efficient linear TD method, at a quadratic cost. We work a solve by hand, weigh the quadratic cost against semi-gradient TD's cheap steps, and note that LSTD never forgets — a problem in control, where least-squares policy iteration is the natural extension.\n",{"path":8056,"title":8057,"module":8013,"summary":8058},"\u002Freinforcement-learning\u002Fapproximation\u002Fmemory-and-kernel-methods","Memory-Based and Kernel Methods","Least-squares TD spent more compute to extract more from each example; this lesson drops the parametric form entirely. Memory-based methods store training examples untouched and answer a query locally at retrieval time — nearest neighbor, weighted average, locally weighted regression — so accuracy grows with the data and effort concentrates where the agent actually goes. Kernel-based methods weight stored examples by a similarity kernel $k(s,s')$, and every linear method turns out to be a kernel method. Interest and emphasis, finally, make the on-policy weighting itself a design choice, aiming scarce approximation capacity at the states that matter.\n",{"path":8060,"title":8061,"module":8013,"summary":8062},"\u002Freinforcement-learning\u002Fapproximation\u002Foff-policy-eligibility-traces","Off-Policy Eligibility Traces","Eligibility traces meet off-policy learning and function approximation — the corner where stability gets hard. We first let the bootstrapping and discounting parameters vary with state, so a single generalized return covers episodic and continuing tasks and folds termination into the discount. Then we fold the per-decision importance ratio into the trace with a control-variate correction, and build Watkins's Q(λ) and its importance-sampling-free successor Tree-Backup(λ) — all correct in expectation, but still semi-gradient, so the deadly triad and its fixes wait for the next lesson.\n",{"path":8064,"title":8065,"module":8013,"summary":8066},"\u002Freinforcement-learning\u002Fapproximation\u002Fstable-off-policy-traces","Stable Off-Policy Methods with Traces","Off-policy traces get the expected target right, but with $\\lambda \u003C 1$ they bootstrap, so off-policy plus bootstrapping plus function approximation is the deadly triad and the weights can diverge. This lesson carries the two one-step fixes to traces: GTD(λ) and GQ(λ) add a second weight vector and a gradient correction for true gradient descent on the projected Bellman error, while Emphatic TD(λ) reweights updates through a followon trace and interest to recover the on-policy stability. It closes with the implementation reality that traces are cheap because they are sparse, and with Retrace and V-trace — the clipped-ratio descendants that make off-policy traces work at deep-RL scale.\n",{"path":8068,"title":7386,"module":8069,"summary":8070},"\u002Freinforcement-learning\u002Fdeep-rl\u002Fdeep-q-networks","Deep Reinforcement Learning","Deep Q-networks replace the linear value function with a neural network $Q(s,a;\\mathbf{w})$ and confront the fact that a nonlinear approximator, off-policy bootstrapping, and correlated online data — the deadly triad — make naive Q-learning diverge. DQN counters this empirically with two stabilizers: an experience replay buffer that decorrelates and reuses samples, and a periodically-frozen target network that fixes the bootstrap target. We derive the DQN loss and gradient, walk through the Atari convolutional architecture and its results, and then add the three refinements that define modern value-based deep RL — Double DQN, dueling networks, and prioritized experience replay.\n",{"path":8072,"title":8073,"module":8069,"summary":8074},"\u002Freinforcement-learning\u002Fdeep-rl\u002Fdqn-improvements","DQN Improvements: Double, Dueling, and Prioritized Replay","Three refinements that turn plain DQN into the standard modern value-based agent, each touching a different part of the system. Double DQN fixes the maximization bias in the target by splitting action selection from evaluation; dueling networks restructure the network around a state value and per-action advantages; prioritized replay changes which transitions are learned from. We close with Rainbow, which combines them, and the distributional view that predicts the whole return distribution rather than its mean.\n",{"path":8076,"title":8077,"module":8069,"summary":8078},"\u002Freinforcement-learning\u002Fdeep-rl\u002Factor-critic-and-ppo","Actor–Critic and GAE","Make the actor and the critic deep networks and the policy-gradient architecture becomes modern deep RL. We build the neural actor-critic, the advantage estimate that replaces the raw return, and Generalized Advantage Estimation as a λ-blend of n-step advantages, then the parallel-worker methods A3C and A2C that decorrelate on-policy data. The step-size constraints — trust regions, PPO, and the continuous-control family — follow in the next lesson.\n",{"path":8080,"title":8081,"module":8069,"summary":8082},"\u002Freinforcement-learning\u002Fdeep-rl\u002Fppo-and-continuous-control","PPO and Continuous Control","Keeping the policy-gradient step from destroying the policy, and the algorithms that result. Trust-region optimization bounds each update by a KL constraint; PPO keeps that goal but replaces the second-order machinery with a first-order clip on the probability ratio, which is why it is the modern default and the optimizer inside RLHF. We then tour the off-policy continuous-control family — DDPG, TD3, and SAC — and where actor-critic went at scale, from OpenAI Five to language-model alignment.\n",{"path":8084,"title":8085,"module":8069,"summary":8086},"\u002Freinforcement-learning\u002Fdeep-rl\u002Fcase-studies","Case Studies: Learning to Play","The game-playing systems that turned reinforcement learning from a theory into a track record: Samuel's checkers player, TD-Gammon, Watson's Daily-Double wagering, a reinforcement-learning memory controller, DQN, and AlphaGo through AlphaGo Zero. Read as a set they draw one line — a value function, learned by self-play or interaction, refined by search, carried by a deep network — that runs from a 1959 checkers program to superhuman Go.\n",{"path":8088,"title":8089,"module":8069,"summary":8090},"\u002Freinforcement-learning\u002Fdeep-rl\u002Frl-beyond-games","Reinforcement Learning Beyond Games","The same value-and-reward machinery, pointed at problems with no opponent. Web personalization as a contextual bandit and then a full MDP for life-time value; thermal soaring, where a glider learns to climb on turbulent air and reward design does most of the work; and the industrial-scale systems that carried the same design past Sutton & Barto — AlphaStar, OpenAI Five, GT Sophy, and RLHF, where the reward itself is learned from human preference.\n",{"path":8092,"title":8093,"module":8069,"summary":8094},"\u002Freinforcement-learning\u002Fdeep-rl\u002Ffrontiers","Frontiers: Beyond the Standard MDP","The standard MDP fixes three things — state, reward, and single-step actions — and this lesson loosens two of them. We generalize the value function into a general value function that predicts any signal, and use those predictions as auxiliary tasks that shape representations; we extend actions in time with the options framework; and we treat state as a construction the agent builds from a stream of observations. Reward design and the open problems follow in the next lesson.\n",{"path":8096,"title":8097,"module":8069,"summary":8098},"\u002Freinforcement-learning\u002Fdeep-rl\u002Freward-design-and-open-problems","Reward Design and Open Problems","How to design a reward signal that encodes the intended goal — sparse reward, shaping, and reward hacking — and the problems the whole tabular, approximate, and deep arc leaves unsolved. We close with how the frontiers were pushed after Sutton & Barto: auxiliary tasks, learned options, intrinsic-motivation bonuses, learned world models, and offline RL, then the two concerns of reward hacking and safety that any real-world agent must address.\n",{"path":8100,"title":8101,"module":8102,"summary":8103},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fdistributional-and-rainbow","Sharpening DQN: Improvements and the Distributional Idea","Modern Deep Reinforcement Learning","In the years after the 2015 DQN paper, a stream of focused improvements each fixed one weakness of the baseline without disturbing its frame. This lesson recaps five that keep the scalar $Q$-value — Double DQN, multi-step returns, dueling networks, prioritized replay, and NoisyNets, each changing a different slot of the same Q-learning loop — then develops the sixth, distributional RL, which changes the objective itself: learn the whole return distribution $Z(s,a)$. We build the distributional Bellman equation and the C51 categorical algorithm, projection step and all, worked end to end on real numbers. A companion lesson takes up QR-DQN, Rainbow, and the modern distributional line.\n",{"path":8105,"title":8106,"module":8102,"summary":8107},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fdistributional-and-rainbow-part-2","Distributional RL and Rainbow","A companion to the DQN improvements lesson. C51 fixed the return atoms and learned their probabilities; QR-DQN does the reverse — fix the probabilities, learn the values — which removes the projection and trains with a quantile loss. We cover why the distribution helps even when you act on the mean, then assemble Rainbow: all six improvements in one Q-learning loop, with the component ablation that shows each one's real weight. The distributional line then runs on through IQN, FQF, and Agent57, the first agent to beat the human baseline on all 57 Atari games.\n",{"path":8109,"title":8110,"module":8102,"summary":8111},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fcontinuous-control","Continuous Control: DDPG and TD3","When actions are real-valued, the $\\arg\\max_a Q(s,a)$ in Q-learning becomes an optimization problem on every step. This lesson builds the off-policy actor-critic family that sidesteps it: the deterministic policy gradient and DDPG, which replaces the max with a learned actor, and the three fixes of TD3 that counter the value overestimation DDPG inherits. A companion lesson takes up SAC's maximum-entropy objective and the methods built on this template.\n",{"path":8113,"title":8114,"module":8102,"summary":8115},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fcontinuous-control-part-2","Continuous Control: SAC and Beyond","A companion to the DDPG and TD3 lesson. Where those actors are deterministic and explore with bolted-on noise, soft actor-critic (SAC) changes the objective itself: maximize return plus the entropy of the policy, so exploration becomes intrinsic and the agent stays robust. We develop the maximum-entropy objective, the reparameterized squashed-Gaussian actor, and automatic temperature tuning, then survey the methods built on this off-policy template — distributional critics (D4PG), critic ensembles (REDQ), and control from pixels (DrQ, RAD).\n",{"path":8117,"title":8118,"module":8102,"summary":8119},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmodel-based-rl","Model-Based Deep RL: Sample Efficiency and PETS","A model turns experience into imagined planning. This lesson makes the sample-efficiency case for learning a dynamics model, works through why a learned model's errors compound over the planning horizon, and builds the most direct model-based method: PETS plans online with a probabilistic ensemble under model-predictive control, distrusting the model exactly where its members disagree. A companion lesson takes up latent world models (Dreamer) and MuZero.\n",{"path":8121,"title":8122,"module":8102,"summary":8123},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmodel-based-rl-part-2","Model-Based Deep RL: World Models, Dreamer, and MuZero","A companion to the PETS lesson. PETS plans in the environment's native state space; these methods change what the model represents. World Models and Dreamer learn a compact latent state and do almost all their learning by imagining inside it, with value gradients flowing through the differentiable dynamics. MuZero predicts neither states nor pixels — only the reward, value, and policy that MCTS reads — and plans with search against that learned model, AlphaZero without the rules. We close with MBPO, TD-MPC, and EfficientZero.\n",{"path":8125,"title":8126,"module":8102,"summary":8127},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fexploration","Exploration in Deep RL: Novelty as Reward","When the state space is enormous and reward is rare, ε-greedy amounts to a random walk that almost never reaches the first reward. This lesson scales the bandit's exploration ideas up to deep RL through the dominant approach — manufacture a reward for novelty and let the agent chase it: optimism and pseudo-counts from density models, and intrinsic motivation and curiosity (the Intrinsic Curiosity Module and Random Network Distillation). A companion lesson takes up posterior sampling, Go-Explore, and the modern methods.\n",{"path":8129,"title":8130,"module":8102,"summary":8131},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fexploration-part-2","Exploration in Deep RL: Posterior Sampling and Go-Explore","A companion to the novelty-as-reward lesson. Pseudo-counts and curiosity reward the unfamiliar after the agent stumbles into it; this lesson covers two ideas that go further. Bootstrapped DQN keeps an ensemble that approximates a posterior over value functions and explores by committing to one sampled hypothesis per episode — the deep, directed exploration ε-greedy cannot manage. Go-Explore remembers and returns to the frontier, defeating detachment and derailment to solve Montezuma's Revenge. We close with episodic memory (Never Give Up), Agent57, and model-based exploration.\n",{"path":8133,"title":8134,"module":8102,"summary":8135},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Foffline-rl","Offline RL: The Problem and Value-Based Fixes","Offline reinforcement learning learns a policy from a fixed logged dataset with no further environment interaction — off-policy learning pushed to the extreme, and it breaks for the extreme version of the same reason. Bootstrapping queries the value function at out-of-distribution actions the data never covers, those errors are optimistic, and with no online feedback to correct them they compound through the Bellman backup. This lesson sets up the failure and off-policy evaluation, then builds the first two families of pessimistic fixes: policy constraint (BCQ) and conservative value estimation (CQL). A companion lesson takes up implicit methods, model-based offline RL, and Decision Transformer.\n",{"path":8137,"title":8138,"module":8102,"summary":8139},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Foffline-rl-part-2","Offline RL: Implicit Methods, Sequence Models, and Beyond","A companion to the offline-RL problem lesson. Policy constraint and conservative value estimation both still query a learned value function; implicit methods (IQL) avoid querying it off the data at all, using an in-sample expectile backup. We then build pessimism into a learned model (MOPO, COMBO) and drop bootstrapping entirely with Decision Transformer's return-conditioned sequence modeling, closing with offline-to-online fine-tuning, diffusion planners, and the offline view of RLHF. The one rule throughout: without online correction, be pessimistic about what you cannot verify.\n",{"path":8141,"title":8142,"module":8102,"summary":8143},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fimitation-and-inverse-rl","Imitation Learning: Cloning, DAgger, and Inverse RL","When a reward is hard to specify but an expert is easy to watch, learn from demonstrations instead. Behavioral cloning treats control as supervised learning of the expert's state-to-action map, and fails through compounding error: small mistakes carry the agent off the expert's distribution, where it was never trained. DAgger fixes the mismatch by querying the expert on the learner's own states. Inverse RL instead recovers the reward the expert seems to optimize — an ill-posed problem that maximum-entropy IRL disambiguates. A companion lesson casts imitation as adversarial occupancy matching (GAIL, AIRL).\n",{"path":8145,"title":8146,"module":8102,"summary":8147},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fimitation-and-inverse-rl-part-2","Imitation as Adversarial Matching: GAIL and AIRL","A companion to the imitation-learning lesson. If the point of recovering a reward is only to re-run RL and match the expert, you can skip the reward and match the behavior directly. GAIL casts imitation as a GAN — a discriminator separating expert from learner state-action pairs supplies the reward a policy-gradient method optimizes — matching occupancy measures without ever naming a reward. AIRL reads a transferable reward back out of the discriminator. We compare all four methods and close with reward models in RLHF, scaled cloning, and diffusion policies.\n",{"path":8149,"title":8150,"module":8102,"summary":8151},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmulti-agent-rl","Multi-Agent RL: Markov Games and Centralized Training","With more than one learning agent in an environment, each agent's world becomes non-stationary because the others are changing too. This lesson builds the Markov-game generalization of the MDP, diagnoses non-stationarity as the central obstacle, shows why the naive baselines fail, and develops the dominant fix — centralized training with decentralized execution (MADDPG, VDN, QMIX). A companion lesson takes up self-play, the landmark game-playing systems, and the equilibrium concepts that define what \"solved\" means.\n",{"path":8153,"title":8154,"module":8102,"summary":8155},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmulti-agent-rl-part-2","Multi-Agent RL: Self-Play and Solution Concepts","A companion to the Markov-games lesson. In the purely competitive setting, an agent can generate its own training curriculum by playing against copies of itself — self-play, the method behind AlphaGo, OpenAI Five, and AlphaStar. We develop why self-play produces an ever-improving opponent, the systems it built, and then the equilibrium solution concepts (Nash, correlated, coarse-correlated) that define what \"solved\" means once there is an opponent, closing with PSRO, MAPPO, and the language-model-agent frontier.\n",{"path":8157,"title":8158,"module":8102,"summary":8159},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fhierarchical-rl","Hierarchical RL: Options and the Option-Critic","Flat RL cannot explore a long horizon: reaching reward through hundreds of primitive actions is exponentially unlikely, and every credit-assignment update crawls one step at a time. Hierarchy breaks one hard long-horizon problem into many short ones. This lesson develops temporal abstraction — the options framework and its semi-Markov view, and learning options end to end with the option-critic. A companion lesson takes up goal-conditioned manager\u002Fworker hierarchies (FeUdal Networks and HIRO), hindsight relabeling, and unsupervised skill discovery.\n",{"path":8161,"title":8162,"module":8102,"summary":8163},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fhierarchical-rl-part-2","Hierarchical RL: Goal-Conditioned Hierarchies and Skills","A companion to the options lesson. Options package a behavior; goal-conditioned hierarchies instead give the top level an explicit language of goals — a manager proposes a target state or a latent direction, and a worker is rewarded for reaching it (FeUdal Networks, HIRO). We develop that architecture, the hindsight relabeling that lets it learn from sparse reward, and unsupervised skill discovery (DIAYN) that learns a repertoire of behaviors with no reward at all. The shared idea throughout: shorten the horizon by inserting a level that decides less often.\n",{"path":8165,"title":8166,"module":8102,"summary":8167},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Frlhf-and-language-models","RLHF and Language Models","A language model trained to predict the next token is fluent but not helpful, honest, or harmless — the objective it was optimized for is not the objective we want. RLHF closes that gap by turning the one thing humans do reliably, comparing two outputs, into a reward. We build the three-stage pipeline: supervised fine-tuning, a Bradley-Terry reward model fit to preference pairs, then PPO against that reward with a KL penalty keeping it near the reference policy. We then cover reward hacking and why the KL penalty matters, Direct Preference Optimization, which folds the reward model into a single classification loss, and the RLAIF and verifiable-reward variants. This pipeline is what makes the largest models usable as assistants.\n",{"path":8169,"title":8170,"module":8102,"summary":8171},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fpartial-observability-pomdps","Partial Observability: POMDPs and the Belief State","Drop the assumption that the agent sees the state. It sees an observation, a partial and noisy function of a hidden state, and one observation is no longer a Markov signal. This lesson builds the POMDP tuple, shows that the belief state — the posterior over hidden states — is a sufficient statistic that turns a POMDP back into an MDP over beliefs, and works the Bayes-filter belief update step by step. A companion lesson explains why exact planning is intractable and develops the deep-RL answer of recurrent, history-based policies.\n",{"path":8173,"title":8174,"module":8102,"summary":8175},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fpartial-observability-pomdps-part-2","Partial Observability: Planning and Recurrent Policies","A companion to the belief-state lesson. In principle a POMDP reduces to an MDP over beliefs; in practice two obstacles block that. Exact planning over the belief simplex is intractable — the value function is piecewise-linear-and-convex with a number of pieces that can explode — and computing the belief needs a model the agent rarely has. This lesson develops the intractability, the point-based approximations that address it, and the deep-RL answer: make the policy a function of history with a recurrent network (DRQN, R2D2), with frame-stacking, attention, and world-model latents as learned beliefs.\n",{"path":8177,"title":8178,"module":8102,"summary":8179},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fsafe-and-constrained-rl","Safe and Constrained RL: The CMDP and Policy Methods","Maximizing a scalar reward is not the same as behaving well: a capable optimizer will find and exploit any gap between the reward and what its designer actually meant, a failure called specification gaming or reward hacking. The remedy is to add explicit cost constraints — the constrained MDP — maximizing return subject to an expected-cost budget. This lesson builds the core toolkit: the CMDP itself, Lagrangian primal-dual methods that learn a multiplier on the constraint (RCPO), and constrained policy optimization (CPO) with its trust-region cost bound. A companion lesson covers risk-sensitivity, safe exploration, and the alignment framing.\n",{"path":8181,"title":8182,"module":8102,"summary":8183},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fsafe-and-constrained-rl-part-2","Safe RL: Risk, Safe Exploration, and Alignment","A companion to the constrained-MDP lesson. Constraining the mean cost is not enough: a policy safe on average can be catastrophic in the tail, and a policy safe at convergence can violate its limits wildly while learning. This lesson optimizes the tail with risk-sensitive objectives (CVaR), then makes exploration itself safe with shields, Lyapunov methods, and safety layers that project unsafe actions onto the feasible set — closing with benchmarks, safe RLHF, robustness, and the alignment framing that ties safety back to the problem of incompletely specified reward.\n",{"path":8185,"title":8186,"module":8102,"summary":8187},"\u002Freinforcement-learning\u002Fmodern-deep-rl\u002Fmeta-rl-and-generalization","Meta-RL and Generalization","An agent that masters one task often fails on the next; it has overfit to a single environment. This lesson treats fast adaptation as a meta-problem over a distribution of tasks: meta-train so that a few episodes at meta-test time suffice. We cover the two families — optimization-based (MAML learns an initialization) and context-based (RL-squared and PEARL infer a latent task) — the exploration cost of adaptation, and the parallel problem of generalization: why deep RL memorizes environments and what fixes it (domain randomization, procedural generation, augmentation, regularization). It closes on foundation models and sequence-model agents as the generalist endpoint.\n",{"path":8189,"title":8190,"module":8191,"summary":8192},"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fpsychology-of-reinforcement","The Psychology of Reinforcement","Reinforcement Learning in Minds and Brains","Reinforcement learning is both an engineering method and a theory of how animals learn. The prediction\u002Fcontrol split of the algorithms mirrors the psychologist's split between classical and instrumental conditioning. We trace the correspondence: the Rescorla–Wagner model as a prediction-error rule that explains blocking, its real-time TD extension, Thorndike's Law of Effect behind trial-and-error control, and the habitual\u002Fgoal-directed distinction that maps onto model-free versus model-based learning.\n",{"path":8194,"title":8195,"module":8191,"summary":8196},"\u002Freinforcement-learning\u002Fminds-and-brains\u002Finstrumental-conditioning-and-control","The Psychology of Reinforcement: Instrumental Control","Classical conditioning was prediction; instrumental conditioning is control. Thorndike's Law of Effect is trial-and-error control — selection plus association, search plus memory — and Skinner's shaping and schedules are reward engineering. The habitual\u002Fgoal-directed distinction maps onto model-free versus model-based control, dissociated by outcome devaluation and arbitrated by uncertainty. Delayed reinforcement is the credit-assignment problem, and the stimulus traces and secondary reinforcers of animal-learning theory are eligibility traces and value functions.\n",{"path":8198,"title":8199,"module":8191,"summary":8200},"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fdopamine-and-td-error","Dopamine and the TD Error","The TD error was invented as an algorithm; a decade later it turned out to closely describe the firing of the brain's dopamine neurons. We follow Schultz's experiments — dopamine fires at an unpredicted reward, shifts to the earliest predictive cue, and dips below baseline when a predicted reward is withheld — and match each result to the TD error term by term. We then read the basal ganglia as a neural actor–critic with dopamine as its shared training signal, and close on addiction as a hijacking of that signal.\n",{"path":8202,"title":8203,"module":8191,"summary":8204},"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fdopamine-in-the-brain","Dopamine in the Brain: The Neural Actor–Critic","If phasic dopamine is a TD error, where does it go and what does it change? We follow the axons into the basal ganglia, read the corticostriatal synapse as the place where state, action, and error meet, and map the ventral and dorsal striatum onto the critic and the actor of an actor–critic. Addiction becomes a broken cancellation in the same learning signal, and distributional dopamine extends the scalar RPE into a population code.\n",{"path":8206,"title":8207,"module":8191,"summary":8208},"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fanimal-learning-and-cognition","Animal Learning and Cognition","Three classic associative phenomena turn out to be reinforcement-learning mechanisms seen in behavior. Blocking says learning is driven by prediction error, not co-occurrence, and reduces to least-squares regression fitting a collinear feature. Higher-order conditioning and conditioned reinforcement make a value estimate a secondary reinforcer — bootstrapping in an animal. Delayed reinforcement is the credit-assignment problem, and the stimulus traces and goal gradients of Pavlov and Hull are eligibility traces and TD-learned value functions.\n",{"path":8210,"title":8211,"module":8191,"summary":8212},"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fcognitive-maps-and-planning","Cognitive Maps and Model-Based Learning","Tolman's rats learned the layout of a maze with no reward, then used it the moment food appeared — latent learning, a cognitive map, and the behavioral face of model-based reinforcement learning. The map is learned by system identification (stimulus–stimulus associations), which fills in whether or not reward is present, and queried by planning, which re-solves a route from a single changed reward. The successor representation sits between cache and model, and hippocampal predictive maps and scaled-up world models carry the same idea into brain and machine.\n",{"path":8214,"title":8215,"module":8191,"summary":8216},"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fneuroscience-of-reinforcement","The Neuroscience of Reinforcement","The dopamine story is one contact point between reinforcement learning and the brain; this lesson fills in the surrounding neuroscience so the mapping stands on its own. We build a working primer of neurons, synapses, and neuromodulation; separate four signals that casual usage conflates — reward, reinforcement, value, and prediction error; and read the actor and critic as corticostriatal synapses updated by two- and three-factor rules, grounded in spike-timing-dependent and reward-modulated plasticity.\n",{"path":8218,"title":8219,"module":8191,"summary":8220},"\u002Freinforcement-learning\u002Fminds-and-brains\u002Fseveral-learning-systems","The Brain's Several Learning Systems","The actor's three-factor rule has an ancestor in Klopf's hedonistic neuron — a single cell as a reinforcement-seeking agent — and a bacterium's run-and-twiddle shows the Law of Effect with no synapses at all. Teams of such neurons implement policy gradient collectively, the broadcast reward replacing backpropagation. And the brain is not only model-free: outcome devaluation, prefrontal value coding, and hippocampal forward sweeps localize a model-based system. The recurring conclusion is that the brain is several interacting learning systems, not one algorithm.\n",{"path":8222,"title":7378,"module":6,"summary":6},"\u002Freinforcement-learning",{"path":8224,"title":8225,"module":3628,"summary":8226},"\u002Fartificial-intelligence\u002Ffoundations\u002Fwhat-is-ai","What Is Artificial Intelligence?","Eight definitions of AI fall into a two-by-two grid: think versus act, and measure success against human performance versus an ideal standard of rationality. We work through all four schools — the Turing test, cognitive modelling, the laws of thought, and the rational agent — and adopt the last as the frame for the whole course: AI is the study and design of rational agents.\n",{"path":8228,"title":8229,"module":3628,"summary":8230},"\u002Fartificial-intelligence\u002Ffoundations\u002Ffoundations-of-ai","The Foundations of AI","Where the rational-agent idea came from and what surrounds it. AI inherited its core tools from eight older disciplines — philosophy, mathematics, economics, neuroscience, psychology, computer engineering, control theory, and linguistics. Its history runs in cycles of boom and winter, from the 1956 Dartmouth workshop through expert systems to the statistical turn. And the deep-learning era — AlexNet, the Transformer, GPT-3, AlphaGo — is a new way of computing the agent function at scale, not a new definition of AI.\n",{"path":8232,"title":8233,"module":3628,"summary":8234},"\u002Fartificial-intelligence\u002Ffoundations\u002Fintelligent-agents","Intelligent Agents","An agent perceives an environment through sensors and acts on it through actuators; its behavior is an agent function mapping percept sequences to actions. A rational agent chooses, for each percept sequence, the action that maximizes its expected performance measure given its knowledge. We build the first half of the vocabulary the whole course rests on — the agent function, rationality, PEAS task specifications, and the six axes along which task environments vary.\n",{"path":8236,"title":8237,"module":3628,"summary":8238},"\u002Fartificial-intelligence\u002Ffoundations\u002Fagent-architectures","Agent Architectures","How to build a program that computes a good agent function without storing an astronomically large lookup table. Four skeleton architectures in order of increasing power — simple reflex, model-based, goal-based, and utility-based — plus the learning agent that improves any of them, the scale of world representations (atomic, factored, structured) they rest on, and how a modern language-model agent fits the same frame.\n",{"path":8240,"title":8241,"module":8242,"summary":8243},"\u002Fartificial-intelligence\u002Fsearch\u002Funinformed-search","Uninformed Search","Search","A goal-based agent that cannot see which action is best turns the problem into a state space — an initial state, a set of actions, a transition model, a goal test, and a path cost — and searches for a sequence of actions reaching the goal. We build the state-space formulation on the 8-puzzle and route-finding, give the one TREE-SEARCH \u002F GRAPH-SEARCH skeleton every algorithm specializes, and measure strategies by completeness, optimality, and complexity. This lesson develops the first two frontier disciplines — breadth-first and uniform-cost search; the rest follow in the next lesson.\n",{"path":8245,"title":8246,"module":8242,"summary":8247},"\u002Fartificial-intelligence\u002Fsearch\u002Fsearch-strategies-compared","Search Strategies Compared","Breadth-first and uniform-cost search pay for optimality in memory. This lesson develops the strategies that trade memory for depth: depth-first search, which keeps only the current path; depth-limited and iterative-deepening search, which fix DFS's failure on infinite paths; and bidirectional search, which meets in the middle for a square-root saving. It closes by lining up all six uninformed strategies against completeness, optimality, and complexity, and tracing where the algorithms came from and where they went.\n",{"path":8249,"title":8250,"module":8242,"summary":8251},"\u002Fartificial-intelligence\u002Fsearch\u002Finformed-search","Informed Search and A*","An informed search uses a heuristic $h(n)$, an estimate of the cost from a node to the goal, to decide what to expand next. Greedy best-first search follows the heuristic blindly and gives up optimality; A* corrects it by ranking nodes on $f(n) = g(n) + h(n)$, and is optimal when the heuristic is admissible (tree search) or consistent (graph search). This lesson defines the heuristic, builds best-first search, and proves why A* is optimal, with the contour picture that explains its pruning. Where good heuristics come from is the next lesson.\n",{"path":8253,"title":8254,"module":8242,"summary":8255},"\u002Fartificial-intelligence\u002Fsearch\u002Fheuristic-functions","Heuristic Functions and Memory-Bounded Search","A* is only as good as its heuristic, so this lesson answers where good heuristics come from: relaxed problems, whose exact solution cost is an admissible heuristic, and pattern databases, which precompute subproblem costs. It measures heuristic quality with dominance and the effective branching factor, then tackles A*'s memory problem with IDA*, RBFS, and SMA*. It closes with modern heuristic search — weighted A*, learned and disjoint pattern-database heuristics, and bidirectional A*.\n",{"path":8257,"title":8258,"module":8242,"summary":8259},"\u002Fartificial-intelligence\u002Fsearch\u002Flocal-search","Local Search and Optimization","When the path to a goal is irrelevant and only the final state matters, we can discard the search tree entirely and keep just the current state, moving to a better neighbor at each step. This lesson builds the state-space landscape metaphor, works through hill climbing and the three obstacles that defeat it (local maxima, ridges, plateaus), then develops the first escapes: random restarts and simulated annealing with its temperature schedule. The population-based methods and continuous-space calculus follow in the next lesson.\n",{"path":8261,"title":8262,"module":8242,"summary":8263},"\u002Fartificial-intelligence\u002Fsearch\u002Fpopulation-and-continuous-search","Population and Continuous Search","Single-state local search escapes a trap by restarting or tolerating downhill moves. This lesson develops the alternatives that keep several states at once — local beam search, which shares successors across parallel threads, and genetic algorithms, which recombine two parents through crossover and mutation — then crosses into continuous spaces, where calculus replaces the finite neighbor set: gradient ascent, line search, and Newton's method. It closes with the industrial descendants of these methods and the loop they all share.\n",{"path":8265,"title":8266,"module":8242,"summary":8267},"\u002Fartificial-intelligence\u002Fsearch\u002Fadversarial-search","Adversarial Search and Games","When another agent plans against you, search becomes a game. We formalize two-player, zero-sum, perfect-information games as search problems, define the minimax value that optimal play backs up through the game tree, and give the MINIMAX algorithm that computes it. Alpha–beta pruning then cuts the cost of that search roughly in half in the exponent without changing the answer, and a heuristic evaluation function plus a cutoff test turns the exact algorithm into a real-time player that copes with the horizon effect.\n",{"path":8269,"title":8270,"module":8242,"summary":8271},"\u002Fartificial-intelligence\u002Fsearch\u002Fgames-of-chance-and-imperfect-information","Games of Chance and Imperfect Information","Minimax and alpha–beta assume a deterministic game both players can see in full. Drop either assumption and search must change. This lesson adds chance nodes and the expectiminimax value for games with dice, then belief-state reasoning for partially observable games — Kriegspiel and card games — where averaging over clairvoyance both helps and misleads. It closes with the line from Deep Blue's alpha–beta to AlphaGo's learned evaluation and Monte Carlo tree search, and the provable-pruning and self-play research around each end of that story.\n",{"path":8273,"title":8274,"module":8242,"summary":8275},"\u002Fartificial-intelligence\u002Fsearch\u002Fconstraint-satisfaction","Constraint Satisfaction Problems","A constraint satisfaction problem replaces the black-box state with a factored one: variables, domains, and constraints. That structure supports inference before any search runs. This lesson defines the CSP on map coloring, Sudoku, and scheduling, then develops constraint propagation: node and arc consistency, the AC-3 algorithm that makes a whole network arc-consistent, and the way one deleted value cascades across the graph to prune impossible options ahead of search.\n",{"path":8277,"title":8278,"module":8242,"summary":8279},"\u002Fartificial-intelligence\u002Fsearch\u002Fcsp-search-and-structure","CSP Search and Structure","Propagation prunes a CSP but rarely finishes it, so we search. This lesson builds backtracking search over partial assignments and the general-purpose heuristics that make it fast — MRV, degree, least-constraining-value, forward checking, MAC, and intelligent backtracking. It then shows how the shape of the constraint graph controls difficulty: tree-structured problems fall in linear time, cutset conditioning handles the rest, and min-conflicts local search solves a million queens in a constant number of steps.\n",{"path":8281,"title":8282,"module":8242,"summary":8283},"\u002Fartificial-intelligence\u002Fsearch\u002Fsearch-under-uncertainty","Search Under Uncertainty","Classical search assumes the agent knows the state it is in and exactly what each action does. Drop the second assumption and a plan can no longer be a fixed sequence of actions. This lesson develops the first response: AND-OR search over nondeterministic actions, which returns a branching contingency plan rather than a straight line. We build it on the erratic vacuum world, show how OR nodes (the agent's choices) alternate with AND nodes (nature's outcomes), trace the recursion that finds a plan, and handle the case where the only solution is a cyclic \"try, try again.\"\n",{"path":8285,"title":8286,"module":8242,"summary":8287},"\u002Fartificial-intelligence\u002Fsearch\u002Fbelief-state-and-online-search","Belief-State and Online Search","When the agent cannot see the full state, a plan can no longer test where it actually is — it must reason over the set of states it might be in. This lesson develops belief-state search, from sensorless (conformant) planning that coerces an unknown world into a goal, through the predict-observe-update cycle of contingent planning with percepts, to online search in unknown environments, where the agent must act in order to learn. It closes with LRTA*, which refines its own heuristic as it explores, one step from reinforcement learning.\n",{"path":8289,"title":8290,"module":8291,"summary":8292},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fpropositional-logic","Logical Agents and Propositional Logic","Logic and Planning","A knowledge-based agent keeps a store of sentences and acts by asking it what to do. To make \"asking\" mean something we need entailment — the relation $KB \\models \\alpha$ that holds when every model of the knowledge base is a model of the query. Propositional logic gives a syntax and a truth-table semantics for which entailment is decidable. This first part builds the foundations: the agent loop, the Wumpus World, models and entailment, the connectives and truth tables, theorem proving by refutation, and the resolution rule with its CNF conversion — a single complete inference procedure for all of propositional logic.\n",{"path":8294,"title":8295,"module":8291,"summary":8296},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fpropositional-inference","Propositional Inference and Logical Agents","Model checking and resolution decide entailment, but both can blow up. This part turns propositional logic into a practical engine and a working agent. Horn clauses give linear-time forward and backward chaining — the basis of logic programming. DPLL and WalkSAT make satisfiability testing fast in the common case. Then we make the agent situated: time-indexed fluents, the frame problem and its solution by successor-state axioms, a hybrid agent that deduces a safe map and plans a route through it, and SATPlan, which finds a plan by asking a SAT solver for a satisfying model.\n",{"path":8298,"title":8299,"module":8291,"summary":8300},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Ffirst-order-logic","First-Order Logic","Propositional logic can only say that facts hold; it cannot talk about the objects a fact is about, or state a rule once and have it cover every object. First-order logic fixes this by committing to a world of objects, relations, and functions. This first part builds the language from the ground up: the ontology it commits to, the model that gives a sentence a truth value, the syntax of terms and sentences, the two quantifiers with their standard mistakes, and equality.\n",{"path":8302,"title":8303,"module":8291,"summary":8304},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Ffirst-order-logic-in-use","First-Order Logic in Use","With the language of first-order logic in hand, this part is about using it well. Database semantics trades expressive power for the convenience of a single intended model; higher-order logic shows what first-order logic gives up for decidability. Then we put the language to work: the Tell\u002FAsk interface, the kinship domain axiomatized from scratch, and the seven-step knowledge-engineering process applied to a digital circuit.\n",{"path":8306,"title":8307,"module":8291,"summary":8308},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Finference-and-resolution","Inference in First-Order Logic","Propositional inference lifts to first-order logic once we can make terms match. Unification is that machinery: the algorithm that finds the substitution making two expressions identical, and the basis of generalized modus ponens. This first part builds the lifted inference rules and the two chaining algorithms they drive — forward chaining, the data-driven procedure behind production systems and Datalog, and backward chaining, the goal-driven procedure behind Prolog.\n",{"path":8310,"title":8311,"module":8291,"summary":8312},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Ffirst-order-resolution","First-Order Resolution","Chaining is complete only for Horn knowledge bases. General first-order sentences — with disjunctive conclusions and negations — need a single sound and complete rule: resolution. This part converts arbitrary sentences to CNF by skolemizing away the existentials, lifts the resolution rule with unification, and proves entailment by refuting the negated goal. The result is the proof procedure Gödel's completeness theorem guarantees will find any entailment, together with the search strategies that make it usable.\n",{"path":8314,"title":8315,"module":8291,"summary":8316},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fclassical-planning","Classical Planning","Classical planning represents a problem in a factored language, PDDL: states are sets of ground fluents, and actions are lifted schemas with a precondition and an effect. That structure turns planning into search — forward through states or backward through goals — and lets a program read heuristics straight off the schemas by relaxing the problem. This first part develops the representation, the two search directions, and the domain-independent heuristics that come from ignoring preconditions or delete lists.\n",{"path":8318,"title":8319,"module":8291,"summary":8320},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fplanning-graphs-and-graphplan","Planning Heuristics and GraphPlan","Every relaxation heuristic can be inaccurate, and none can tell how far apart subgoals sit. The planning graph is a polynomial-size structure that does better: leveled off the problem, it yields admissible distance estimates and a record of which actions and fluents cannot coexist. This part builds the graph, reads heuristics from it, extracts plans with GraphPlan, and closes with the other classical approaches — SATPlan and partial-order planning — and the representational trade that makes all of it work.\n",{"path":8322,"title":8323,"module":8291,"summary":8324},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fplanning-in-the-real-world","Planning and Acting in the Real World","Classical planning's clean theory rests on four assumptions: time is ignored, actions are atomic, the world is deterministic and fully observable, and the agent is alone. This first part drops the first two. We add durations and resource constraints — turning a plan into a schedule, solved by the critical-path method and, once resources contend, by NP-hard job-shop scheduling — and let a planner reason at multiple levels of abstraction through high-level actions and their angelic reachable sets.\n",{"path":8326,"title":8327,"module":8291,"summary":8328},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fplanning-under-uncertainty","Planning Under Uncertainty","Classical planning assumed the world was deterministic, fully observable, and the agent alone. This part drops the last two assumptions. When the agent cannot see or predict the world, planning moves into belief-state space: sensorless plans that coerce the world into the goal without sensing, contingent plans that branch on what is sensed, and online agents that monitor and replan when execution diverges. Then we add other agents — joint plans, the coordination problem, and the conventions that let a team act without constant negotiation.\n",{"path":8330,"title":8331,"module":8291,"summary":8332},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Fknowledge-representation","Knowledge Representation","First-order logic gives you the language; this lesson is about what to say in it. This first part builds the content: a general upper ontology from the top down, categories as first-class objects with taxonomies and inheritance, physical composition and the count-noun\u002Fmass-noun split, events and time reified through the event calculus, and belief modeled with modal logic — the machinery for representing the world an agent reasons about.\n",{"path":8334,"title":8335,"module":8291,"summary":8336},"\u002Fartificial-intelligence\u002Flogic-and-planning\u002Freasoning-systems-and-defaults","Reasoning Systems and Default Logic","Having represented the world, this part is about reasoning with it at scale. Semantic networks give a graphical notation with fast inheritance; description logics keep subsumption and classification tractable by design. Then we confront the fact that most useful rules hold only by default: circumscription and default logic give a logical account of nonmonotonic reasoning, and truth maintenance systems retract conclusions cleanly when the beliefs beneath them change.\n",{"path":8338,"title":8339,"module":8340,"summary":8341},"\u002Fartificial-intelligence\u002Funcertainty\u002Fprobability-and-bayes","Quantifying Uncertainty","Uncertainty","Logic breaks down in any domain where the rules have exceptions you cannot enumerate — the qualification problem. Probability replaces truth values with degrees of belief that obey Kolmogorov's axioms, and the full joint distribution becomes a knowledge base from which any query is answered by summing entries: marginalization, conditioning, and normalization. Independence factors that joint into smaller pieces — the first step toward a calculus of rational belief that an agent can actually compute with.\n",{"path":8343,"title":8344,"module":8340,"summary":8345},"\u002Fartificial-intelligence\u002Funcertainty\u002Fbayes-rule-and-naive-bayes","Bayes' Rule and Naive Bayes","Bayes' rule inverts a causal model into a diagnostic one, turning \"how a cause produces its symptoms\" into \"which cause explains what I observed.\" Ignoring the prior is the base-rate fallacy behind overconfident test results. Conditional independence then lets several pieces of evidence combine by multiplying likelihood ratios instead of building an exponential joint, giving the naive Bayes model and pointing directly at Bayesian networks.\n",{"path":8347,"title":8348,"module":8340,"summary":8349},"\u002Fartificial-intelligence\u002Funcertainty\u002Fbayesian-networks","Bayesian Networks","A Bayesian network is a directed acyclic graph of random variables in which each node carries a conditional probability table for itself given its parents. That structure factors the full joint distribution into a product of local terms, turning an exponential table into a linear one, and it makes the conditional independences of the domain explicit. We build the canonical burglary–alarm network, read compactness and d-separation off the graph, run exact inference by variable elimination, and, where that is intractable, estimate answers by sampling.\n",{"path":8351,"title":8352,"module":8340,"summary":8353},"\u002Fartificial-intelligence\u002Funcertainty\u002Finference-in-bayesian-networks","Bayesian Networks: Inference and Relational Models","When exact inference is intractable, sampling estimates the posterior instead: prior and rejection sampling, likelihood weighting, and Gibbs\u002FMCMC, whose error shrinks as one over the square root of the sample count. The same graphical idea then lifts from a fixed set of variables to whole populations — relational and open-universe probability models write dependencies once and unroll them over objects — and we close by placing probability against the rule-based, Dempster–Shafer, and fuzzy alternatives it displaced.\n",{"path":8355,"title":8356,"module":8340,"summary":8357},"\u002Fartificial-intelligence\u002Funcertainty\u002Freasoning-over-time","Probabilistic Reasoning over Time","A world that changes needs a state variable at every point in time. The Markov assumption cuts the dependence on history down to the previous slice, leaving a transition model and a sensor model that define a temporal Bayesian network. Four recursive tasks fall out — filtering, prediction, smoothing, and the most likely explanation — each a message passed along the sequence. We ground them in hidden Markov models and their matrix form, sketch the Kalman filter for continuous state, and reach dynamic Bayesian networks with particle filtering as the general approximate method.\n",{"path":8359,"title":8360,"module":8340,"summary":8361},"\u002Fartificial-intelligence\u002Funcertainty\u002Ftracking-and-data-association","Reasoning over Time: Tracking and Data Association","Dynamic Bayesian networks generalize HMMs and Kalman filters to arbitrarily many state variables per slice, and when exact inference blows up, particle filtering approximates the belief state with a population of weighted samples that propagate, reweight, and resample. Tracking several objects at once adds the data-association problem — which observation came from which object — whose combinatorics defeat any exact filter, so particle filters and MCMC keep many hypotheses alive. We close with SLAM and learned state-space models.\n",{"path":8363,"title":8364,"module":8340,"summary":8365},"\u002Fartificial-intelligence\u002Funcertainty\u002Fmaking-decisions","Making Decisions: Utility Theory","A rational agent chooses the action that maximizes expected utility — the probability of each outcome weighted by how much the agent wants it. We derive the utility function from six axioms on preferences, so maximizing expected utility is forced by consistency rather than assumed; look at risk aversion in the utility-of-money curve; package one-shot choices into decision networks; and quantify what an observation is worth with the value of information.\n",{"path":8367,"title":7956,"module":8340,"summary":8368},"\u002Fartificial-intelligence\u002Funcertainty\u002Fmarkov-decision-processes","When an agent must act repeatedly in a stochastic world, a fixed plan is useless — it needs a policy, an action for every state. The Markov decision process makes this precise with a transition model, a reward, and a discount factor; the Bellman equation characterizes the optimal state utilities, and value iteration and policy iteration solve it. Partial observability lifts the problem to belief states, and bandits, Monte-Carlo tree search, and scalable POMDP solvers extend it — this is the model-known half of reinforcement learning.\n",{"path":8370,"title":8371,"module":8340,"summary":8372},"\u002Fartificial-intelligence\u002Funcertainty\u002Fdecision-networks-and-game-theory","Decision Analysis: Multi-Attribute Utility and Decision Networks","Decision analysis takes the single-agent utility framework and makes it practical: utility over several attributes, dominance and additive value functions, influence diagrams that fold Bayesian networks together with decision and utility nodes, and the value of information that tells an agent which questions are worth asking. Structure in an agent's preferences — dominance, preferential and utility independence — collapses an exponential utility table into a few one-dimensional functions, the same move that made Bayesian networks compact.\n",{"path":8374,"title":8375,"module":8340,"summary":8376},"\u002Fartificial-intelligence\u002Funcertainty\u002Fgame-theory-and-mechanism-design","Game Theory and Mechanism Design","When outcomes depend on other rational agents, single-agent utility maximization no longer suffices. Game theory studies decisions among agents — normal-form games, dominant strategies, Nash and maximin equilibria, and repeated games — and mechanism design runs the logic backwards, engineering rules (auctions, VCG) so that self-interested play produces a good collective outcome. Algorithmic game theory then asks whether equilibria can be computed, what selfishness costs society, and how the mechanisms deployed at internet scale actually behave.\n",{"path":8378,"title":8379,"module":8380,"summary":8381},"\u002Fartificial-intelligence\u002Flearning\u002Flearning-from-examples","Learning from Examples","Learning","An agent that improves with experience does not need its designer to anticipate every situation. Inductive learning takes that ambition and narrows it to one tractable problem: from labelled input-output pairs, recover a function that predicts the output for inputs never seen. This first part builds the foundation around a single organizing question — generalization — through decision trees and information gain, and the training\u002Fvalidation\u002Ftest discipline for evaluating and choosing hypotheses. A second part takes up the theory of learning and the main model families.\n",{"path":8383,"title":8384,"module":8380,"summary":8385},"\u002Fartificial-intelligence\u002Flearning\u002Ftheory-and-model-families","The Theory of Learning and Model Families","Cross-validation measures generalization but does not explain it. This part supplies the theory — PAC learning, sample complexity, and the VC dimension — that says when a hypothesis consistent with enough data is probably approximately correct, and why an unrestricted hypothesis space can never generalize. It then surveys the model families a practitioner reaches for: linear regression and gradient descent, the perceptron and logistic regression, support vector machines and the kernel trick, and ensembles by bagging and boosting — closing with what deep learning changed about the classical picture.\n",{"path":8387,"title":8388,"module":8380,"summary":8389},"\u002Fartificial-intelligence\u002Flearning\u002Fprobabilistic-learning","Learning Probabilistic Models","A [Bayesian network](\u002Fartificial-intelligence\u002Funcertainty\u002Fbayesian-networks) is useless until its numbers are filled in, and those numbers come from data. This first part casts learning itself as probabilistic inference: hypotheses carry a prior, data update it to a posterior, and predictions average over what remains. From that frame fall the standard estimators — maximum likelihood by counting, MAP with a conjugate prior, full Bayesian updating — for the case where every variable is observed. A second part takes up the harder case of hidden variables and the EM algorithm.\n",{"path":8391,"title":8392,"module":8380,"summary":8393},"\u002Fartificial-intelligence\u002Flearning\u002Fexpectation-maximization","Learning with Hidden Variables: The EM Algorithm","Complete data can be learned by counting; real data usually hide some variables — the disease behind the symptoms, the cluster behind the points. This part develops the expectation-maximization algorithm, which learns those models by alternating an expected completion of the missing data with a re-estimation of the parameters. It works the idea through mixtures of Gaussians, Bayesian networks, and hidden Markov models, proves the monotone-likelihood guarantee from the evidence lower bound, and traces the line from EM to variational inference and the variational autoencoder.\n",{"path":8395,"title":7378,"module":8380,"summary":8396},"\u002Fartificial-intelligence\u002Flearning\u002Freinforcement-learning","Reinforcement learning is an MDP with the model unknown: the agent knows neither how its actions move the world nor which states are rewarded, and must recover good behaviour from experienced transitions and rewards alone. This first part builds the classical tabular theory — passive learning (fix a policy, learn its value, by direct estimation, adaptive dynamic programming, and temporal differences) and active learning (choose actions, trade exploration against exploitation, and learn control with Q-learning and SARSA). A second part lifts it off the lookup table with function approximation and policy search.\n",{"path":8398,"title":8399,"module":8380,"summary":8400},"\u002Fartificial-intelligence\u002Flearning\u002Fgeneralization-and-policy-search","Reinforcement Learning: Generalization and Policy Search","Tabular reinforcement learning stores one number per state, which is hopeless for backgammon or chess. This part lifts RL off the lookup table with function approximation, so that updating one state generalizes to related ones, then turns to policy search — representing and optimizing the policy directly, up to the REINFORCE policy gradient and correlated sampling. It closes with the bridge to deep reinforcement learning (deep Q-networks, actor-critic, PPO), the classic applications, and the hand-off to the dedicated RL subject.\n",{"path":8402,"title":8403,"module":8380,"summary":8404},"\u002Fartificial-intelligence\u002Flearning\u002Fknowledge-in-learning","Knowledge in Learning","Pure induction learns a function from labelled examples while knowing almost nothing to begin with. This first part brings prior knowledge into the loop by recasting learning as logical inference — hypotheses, examples, and classifications as sentences. It develops current-best-hypothesis search, the version space and its general\u002Fspecific boundary maintained by candidate elimination, and states the three entailment constraints that fix how background knowledge enters. A second part builds the three knowledge-based methods those constraints define.\n",{"path":8406,"title":8407,"module":8380,"summary":8408},"\u002Fartificial-intelligence\u002Flearning\u002Fknowledge-based-learning-methods","Knowledge-Based Learning: EBL, Relevance, and ILP","Once learning is cast as logical inference, three methods follow from the three ways prior knowledge can enter. Explanation-based learning generalizes a single example by explaining it with the domain theory, gaining speed but nothing new. Relevance-based learning uses determinations to shrink the hypothesis space and converge from fewer examples. Inductive logic programming learns genuinely new first-order rules — top-down with FOIL, bottom-up by inverting resolution, even inventing new predicates — and connects to modern statistical relational and neuro-symbolic learning.\n",{"path":8410,"title":8411,"module":8412,"summary":8413},"\u002Fartificial-intelligence\u002Ffrontiers\u002Fvision-and-perception","Vision and Perception","Frontiers","Perception connects an agent to the physical world. We follow one modality — vision — from the physics of image formation (the pinhole camera, perspective projection, lenses, shading, color) through the early operations that turn a pixel array into edges, texture, and motion, and into recognition by appearance. The recurring problem is inversion: a camera collapses a 3-D world onto a 2-D grid, and an agent that wants to act must build the scene back up. Rebuilding the scene is the subject of the companion lesson.\n",{"path":8415,"title":8416,"module":8412,"summary":8417},"\u002Fartificial-intelligence\u002Ffrontiers\u002Freconstructing-the-3d-world","Vision: Reconstructing the 3D World","A camera collapses a three-dimensional world onto a flat grid; this lesson inverts that collapse. We build the camera projection matrix (intrinsics and extrinsics), triangulate a point from two views, then work through the toolbox of depth cues — motion parallax, binocular stereopsis, multiple views, texture, shading, and contour — that turn an ambiguous image back into a scene. We add structural recognition (pictorial-structure \"cardboard people\"), the task-driven use of vision in cars and robots, and the shift from hand-built pipelines to learned deep-vision networks.\n",{"path":8419,"title":8420,"module":8412,"summary":8421},"\u002Fartificial-intelligence\u002Ffrontiers\u002Frobotics","Robotics","A robot is an agent with a body: sensors that read the physical world and effectors that push back on it. This lesson grounds the abstract AI machinery in that body. We build up the hardware (range finders, proprioception, degrees of freedom), then cast perception as probabilistic filtering — the kinematic motion and sensor models, Monte Carlo localization, the extended Kalman filter, and simultaneous localization and mapping (SLAM). The companion lesson takes the estimated pose forward into planning and control.\n",{"path":8423,"title":8424,"module":8412,"summary":8425},"\u002Fartificial-intelligence\u002Ffrontiers\u002Frobot-planning-and-control","Robotics: Planning and Control","A robot that knows where it is still has to decide how to move, and then make a slipping, sensing-imperfect body actually go there. This lesson takes the pose estimate forward: planning motion in configuration space with cell decomposition and sampling-based roadmaps (PRMs and RRTs), planning under uncertainty with most-likely-state and online replanning, closing the loop with P\u002FPD\u002FPID control and potential fields, and finally the software architectures — subsumption, three-layer, and pipeline — that assemble it all, plus the learning-based turn in modern robotics.\n",{"path":8427,"title":8428,"module":8412,"summary":8429},"\u002Fartificial-intelligence\u002Ffrontiers\u002Fnatural-language-in-ai","Natural Language for AI Agents","Language is how agents acquire the knowledge already written down and how they communicate with the humans they serve. This lesson gives the classical AI account of language as a source of information: n-gram language models and the information-seeking tasks built on them — text classification, information retrieval (BM25, the inverted index, PageRank), and information extraction with finite-state templates and hidden Markov models. Throughout, we point to the dedicated NLP subject for the modern deep-learning treatment; the companion lesson takes up grammar, translation, and speech.\n",{"path":8431,"title":8432,"module":8412,"summary":8433},"\u002Fartificial-intelligence\u002Ffrontiers\u002Fnlp-grammar-translation-and-speech","Language for AI Agents: Grammar, Translation, and Speech","N-gram models see only a local window; they cannot say why \"black dog\" is well-formed English and \"dog black\" is not, because that is a fact about structure. This lesson takes up structure: phrase-structure and probabilistic context-free grammars, syntactic analysis by chart parsing and CYK, augmented grammars and compositional semantics, then the two major statistical successes — machine translation and speech recognition — cast as noisy-channel problems. It closes with the bridge from n-grams to transformers and where the classical account sits relative to modern NLP.\n",{"path":8435,"title":8436,"module":8412,"summary":8437},"\u002Fartificial-intelligence\u002Ffrontiers\u002Fphilosophy-and-future","Philosophy, Ethics, and the Future of AI","Two questions have shadowed the field since its founding: can machines act intelligently (weak AI), and can they really think (strong AI)? We work through Turing's objections and their rebuttals — the arguments from disability, mathematics, and informality — then the strong-AI debate: the mind-body problem, functionalism and the brain prosthesis, Searle's Chinese Room and the systems reply, and consciousness and qualia. The companion lesson turns from what AI can do to what it should, and closes the course.\n",{"path":8439,"title":8440,"module":8412,"summary":8441},"\u002Fartificial-intelligence\u002Ffrontiers\u002Fai-ethics-and-future","The Ethics and Future of AI","Having asked whether machines can act intelligently and really think, we turn to whether we should build them at all. This lesson works through the six ethical risks — lost jobs, autonomous weapons, surveillance and privacy, biased decisions, the safety of superintelligence, and the erosion of accountability — then the value-alignment problem in the LLM era, and where the classical agent components could go next. It closes the course by tying search, logic, probability, and learning into a single picture of intelligence as rational agency.\n",{"path":8443,"title":8444,"module":6,"summary":6},"\u002Fartificial-intelligence","Artificial Intelligence",{"path":8446,"title":8447,"module":8448,"summary":8449},"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-constituents-nuclide-chart","Nuclear Composition and Ground-State Properties","Nuclear Properties","The nucleus is a bound assembly of Z protons and N neutrons packed to a radius R = R0 A^(1\u002F3) at a nearly constant density of about 10^17 kg\u002Fm^3. We fix the vocabulary of nuclides, derive nuclear size from mirror-nuclide and electron-scattering data, read the binding-energy-per-nucleon curve, and model it with the liquid-drop semiempirical mass formula.\n",{"path":8451,"title":8452,"module":8448,"summary":8453},"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-size-charge-distributions","Nuclear Size, Shape, and Charge Distributions","Elastic electron scattering resolves the nucleus by its de Broglie wavelength. The measured cross section is the Mott point-charge cross section modulated by a form factor, and that form factor is the Fourier transform of the charge density. Diffraction minima fix the radius, the small-angle slope fixes the mean-square radius, and the fitted Woods-Saxon profile gives a central density and a skin thickness. Mirror-nucleus Coulomb energies, muonic-atom X-rays, and optical isotope shifts give independent radii that all track R = R0 A^(1\u002F3).\n",{"path":8455,"title":8456,"module":8448,"summary":8457},"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-masses-binding-energy","Nuclear Masses, Mass Excess, and Separation Energies","The atomic mass unit fixes the scale, and the mass excess collects the small binding-driven deviation from the integer mass number. Penning-trap cyclotron frequencies now measure masses to parts in a billion, and every decay and reaction Q-value is a difference of these masses. One- and two-nucleon separation energies read the binding difference between neighbouring nuclides directly, showing the even-odd pairing stagger and the sharp drops at magic numbers, and their vanishing marks the neutron and proton drip lines that bound the chart of the nuclides.\n",{"path":8459,"title":8460,"module":8448,"summary":8461},"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fsemi-empirical-mass-formula","The Semi-Empirical Mass Formula and the Valley of Stability","Five physical terms reproduce nuclear binding across the chart: a volume term from saturation, a surface term from the deficit of edge neighbours, a Coulomb term from the electrostatic self-energy of a charged sphere, an asymmetry term from the Pauli cost of unequal proton and neutron filling, and a pairing term. The formula is quadratic in Z at fixed A, so isobars lie on a mass parabola whose minimum sets the most stable charge and whose slope dictates the direction of beta decay. The same competition between surface and Coulomb energy defines the fissility parameter and the onset of fission.\n",{"path":8463,"title":8464,"module":8448,"summary":8465},"\u002Fnuclear-physics\u002Fnuclear-properties\u002Fnuclear-moments-multipoles","Nuclear Spin, Magnetic Dipole, and Electric Quadrupole Moments","The ground state of a nucleus carries a definite spin and parity, a magnetic dipole moment of order the nuclear magneton, and, when its spin exceeds one-half, an electric quadrupole moment that measures its shape. The single-particle Schmidt lines predict the magnetic moment of an odd-A nucleus from the last unpaired nucleon, and the measured moments fall between them. The quadrupole moment distinguishes prolate from oblate deformation, and hyperfine structure is the experimental handle that fixes the spin and the moments from an atomic spectrum.\n",{"path":8467,"title":8468,"module":8469,"summary":8470},"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fnuclear-force-shell-overview","The Nuclear Force and the Shell Model","The Nuclear Force","The strong force between nucleons is short-range, charge-independent, saturated, and repulsive at its core, about a hundred times stronger than Coulomb. Yukawa explained it as an exchange of massive mesons, tying the force's range to the meson mass through the uncertainty principle. Layered on top, an independent-particle shell model with strong spin-orbit coupling reproduces the magic numbers 2, 8, 20, 28, 50, 82, 126.\n",{"path":8472,"title":8473,"module":8469,"summary":8474},"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fthe-deuteron","The Deuteron and the Tensor Force","The deuteron is the only bound two-nucleon state: one shallow level at 2.22 MeV, no excited states. A square-well fit fixes a depth near 35 MeV over a 2 fm range, yet the wavefunction leaks so far past the edge that most of the probability lies outside the force. Its spin-1 ground state, magnetic moment close to the sum of the free-nucleon moments, and small but nonzero electric quadrupole moment together force a D-state admixture and a non-central tensor force.\n",{"path":8476,"title":8477,"module":8469,"summary":8478},"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fnucleon-nucleon-scattering","Nucleon-Nucleon Scattering and the Interaction's Structure","Scattering probes the nuclear force above threshold. Partial-wave analysis reduces low-energy data to a single s-wave phase shift, and the effective-range expansion packages that into a scattering length and an effective range. The triplet channel binds (the deuteron) while the singlet is only virtual, which together explain the anomalously large free neutron-proton cross section. Comparing pp, nn, and np results establishes charge symmetry and charge independence, and polarization experiments expose the spin-orbit and tensor pieces.\n",{"path":8480,"title":8481,"module":8469,"summary":8482},"\u002Fnuclear-physics\u002Fnuclear-force-deuteron\u002Fmeson-theory-isospin","Meson Exchange, the Yukawa Potential, and Isospin","Yukawa's massive-field propagator turns the range of the nuclear force into a meson mass: the exchanged quantum's Compton wavelength is the range. One-pion exchange fixes the long-range tail, complete with the tensor structure the deuteron demanded, while heavier mesons build the intermediate attraction and the repulsive core. Charge independence becomes an isospin symmetry, the force is diagonalized by the total isospin through a tau-dot-tau interaction, and the whole picture sits inside QCD as a residual color force between color-neutral nucleons.\n",{"path":8484,"title":8485,"module":8486,"summary":8487},"\u002Fnuclear-physics\u002Fnuclear-models\u002Ffermi-gas-model","The Fermi Gas Model","Nuclear Models","Treating the nucleus as two degenerate Fermi gases of protons and neutrons confined in a common well fixes the Fermi momentum near 250 MeV\u002Fc and the Fermi energy near 33 MeV from the nuclear density alone. The average kinetic energy per nucleon is about 20 MeV, the well depth is the Fermi energy plus the separation energy, and unequal proton and neutron Fermi levels reproduce the asymmetry term of the mass formula.\n",{"path":8489,"title":8490,"module":8486,"summary":8491},"\u002Fnuclear-physics\u002Fnuclear-models\u002Fliquid-drop-collective-coordinates","The Liquid-Drop Model and Collective Deformation","Deforming a charged liquid drop into a spheroid raises its surface energy and lowers its Coulomb energy; the two effects compete through the deformation parameter to set a stability minimum and a fission barrier. The ratio of Coulomb to twice the surface energy is the fissility Z-squared over A, which crosses one near 49 and marks the point where the sphere is unstable. The same surface tension that restores small deformations quantizes into collective vibrations, carrying the static mass formula into dynamic collective motion.\n",{"path":8493,"title":8494,"module":8486,"summary":8495},"\u002Fnuclear-physics\u002Fnuclear-models\u002Fshell-model-single-particle","The Shell Model: Single-Particle States and Spin-Orbit Coupling","A harmonic-oscillator well reproduces the first three magic numbers but fails above twenty; adding a strong inverted spin-orbit term that drives the stretched j equals l plus one-half level down closes the gaps at 28, 50, 82, and 126. The filled shells couple to zero, so the last unpaired nucleon fixes the ground-state spin and parity, and its single-particle magnetic moment falls on the Schmidt lines. Configuration mixing sets the limits of the extreme single-particle model.\n",{"path":8497,"title":8498,"module":8486,"summary":8499},"\u002Fnuclear-physics\u002Fnuclear-models\u002Fcollective-model-rotations-vibrations","The Collective Model: Rotations, Vibrations, and Deformed Nuclei","Deformed nuclei rotate with energies proportional to I times I plus one, giving the ground-state band its characteristic level ratios, while near-spherical nuclei vibrate in quantized surface phonons that build one- and two-phonon multiplets. The Nilsson model tracks single-particle levels as the well deforms, moments of inertia fall between the rigid and irrotational limits, backbending marks the sudden alignment of a broken pair, and giant resonances are the bulk dipole and quadrupole modes of the whole nucleus.\n",{"path":8501,"title":8502,"module":8503,"summary":8504},"\u002Fnuclear-physics\u002Fradioactive-decay\u002Fdecay-law-modes","Radioactivity and Decay Modes","Radioactive Decay","Unstable nuclei decay at a rate proportional to how many remain, giving the exponential law N(t) = N0 e^(-lambda t) with half-life t = 0.693\u002Flambda. We work through the three common modes: alpha decay as Coulomb-barrier tunneling with the Geiger-Nuttall rule, beta decay whose continuous spectrum demands the neutrino, and gamma de-excitation, and follow a decay chain across the chart of nuclides.\n",{"path":8506,"title":8507,"module":8503,"summary":8508},"\u002Fnuclear-physics\u002Fradioactive-decay\u002Fdecay-kinetics-equilibrium","Serial Decay, the Bateman Equations, and Radioactive Equilibrium","A radioactive parent that decays into a radioactive daughter obeys a coupled pair of rate equations whose solution is the Bateman formula. Depending on the half-life ordering the chain settles into secular equilibrium (equal activities), transient equilibrium (a fixed activity ratio), or no equilibrium. Constant production under irradiation drives the activity toward a saturation value equal to the production rate, competing decay modes split the total decay constant into partial constants, and the natural decay series in secular equilibrium underpin radiometric dating.\n",{"path":8510,"title":8511,"module":8512,"summary":8513},"\u002Fnuclear-physics\u002Falpha-decay\u002Falpha-decay-gamow-theory","Alpha Decay and the Gamow Theory of Tunneling","Alpha Decay","The alpha Q-value turns positive above mass number 150 because the emitted helium-4 is exceptionally tightly bound. Emission proceeds by quantum tunneling through the Coulomb barrier: a WKB integral from the nuclear surface to the outer turning point gives the Gamow factor, and multiplying its penetrability by the assault frequency yields half-lives spanning more than twenty orders of magnitude. The leading term reproduces the Geiger-Nuttall relation, log t½ proportional to the daughter charge over the square root of Q.\n",{"path":8515,"title":8516,"module":8512,"summary":8517},"\u002Fnuclear-physics\u002Falpha-decay\u002Falpha-fine-structure-hindrance","Fine Structure, Angular Momentum, and Hindrance Factors","A single parent emits several alpha groups of slightly different energy, each feeding a distinct level of the daughter, so the alpha spectrum maps the daughter's low-lying states. Emission with orbital angular momentum L raises the barrier by a centrifugal term and is allowed only when angular-momentum and parity selection rules permit. Comparing the measured partial half-life to the Gamow estimate defines a hindrance factor near unity for even-even ground-state transitions and large for odd-A decays that must rearrange the unpaired nucleon.\n",{"path":8519,"title":8520,"module":8521,"summary":8522},"\u002Fnuclear-physics\u002Fbeta-decay\u002Fbeta-decay-energetics-neutrino","Beta Decay Energetics and the Neutrino","Beta Decay and the Weak Interaction","Beta decay converts a neutron into a proton or the reverse, adjusting Z at fixed A along an isobaric mass parabola. We write the three processes (beta-minus, beta-plus, electron capture), reduce every Q-value to a difference of neutral atomic masses, and read the continuous electron spectrum as the fingerprint of a third, nearly massless particle. Pauli's neutrino, its detection by Reines and Cowan, and the endpoint bound on its mass close the lesson.\n",{"path":8524,"title":8525,"module":8521,"summary":8526},"\u002Fnuclear-physics\u002Fbeta-decay\u002Ffermi-theory-beta-decay","Fermi's Theory: Kurie Plots and ft Values","Fermi treated beta decay as a point-contact weak transition and read its rate from the golden rule. The electron spectrum then follows from phase space and the Coulomb Fermi function; the Kurie plot straightens it to a line whose intercept is the endpoint. Integrating the spectrum gives the comparative half-life ft, whose logarithm sorts transitions into superallowed, allowed, and forbidden classes governed by the Fermi and Gamow-Teller selection rules.\n",{"path":8528,"title":8529,"module":8521,"summary":8530},"\u002Fnuclear-physics\u002Fbeta-decay\u002Fweak-interaction-parity-violation","The Weak Interaction and Parity Violation","Beta decay violates mirror symmetry. The Wu experiment on polarized cobalt-60 showed electrons emitted preferentially against the nuclear spin, a pseudoscalar correlation forbidden if parity were conserved. The result fixes the weak charged current as left-handed V minus A, forces neutrinos to be left-handed and antineutrinos right-handed (measured by Goldhaber), and places beta decay within the electroweak theory as W-boson exchange turning a down quark into an up quark.\n",{"path":8532,"title":8533,"module":8521,"summary":8534},"\u002Fnuclear-physics\u002Fbeta-decay\u002Fdouble-beta-decay-neutrino-mass","Double Beta Decay and Neutrino Mass","For even-A isobars the pairing term splits the mass parabola into two curves, and a handful of even-even nuclides sit below their odd-odd neighbor yet above the next even-even one: single beta decay is forbidden but second-order double beta decay is allowed. The two-neutrino mode is a standard-model process with the longest measured lifetimes in nature; the neutrinoless mode would require the neutrino to be its own antiparticle and its rate measures the effective Majorana mass, the sharpest probe of the absolute neutrino mass scale.\n",{"path":8536,"title":8537,"module":8538,"summary":8539},"\u002Fnuclear-physics\u002Fgamma-decay\u002Fgamma-multipole-radiation","Multipole Radiation and Selection Rules","Gamma Decay","Gamma decay carries a nucleus from an excited state to a lower one by emitting a photon of definite angular momentum and parity. We correct the photon energy for nuclear recoil, expand the radiation field into electric and magnetic multipoles, and read off how the transition rate collapses with each increase in multipole order. The Weisskopf single-particle estimates set the scale, and angular-momentum and parity conservation fix which multipole dominates.\n",{"path":8541,"title":8542,"module":8538,"summary":8543},"\u002Fnuclear-physics\u002Fgamma-decay\u002Finternal-conversion-isomers","Internal Conversion and Isomers","A nucleus can shed excitation energy without emitting a photon by handing it directly to an atomic electron. We define the internal-conversion coefficient, trace its growth with atomic number, multipole order, and decreasing energy, and treat the electron-only E0 transitions and internal pair formation. When the lowest allowed multipole is high and the energy low, the gamma rate falls so far that the excited state survives as a metastable isomer.\n",{"path":8545,"title":8546,"module":8538,"summary":8547},"\u002Fnuclear-physics\u002Fgamma-decay\u002Fangular-correlations-mossbauer","Angular Correlations and the Mössbauer Effect","Two gammas emitted in cascade are not independent in direction: detecting the first selects magnetic substates of the intermediate level and makes the second anisotropic, so the correlation function fixes the intermediate spin. The same nuclear resonance that recoil normally destroys is recovered when the emitter is locked in a lattice, giving the Mössbauer effect and its part-in-a-trillion resolution of isomer shifts and hyperfine fields.\n",{"path":8549,"title":8550,"module":8551,"summary":8552},"\u002Fnuclear-physics\u002Fnuclear-reactions\u002Freaction-kinematics-cross-sections","Nuclear Reactions, Fission, and Fusion","Nuclear Reactions","A nuclear reaction X(x, y)Y is governed by its Q value and its cross section, the effective target area for a given process. Splitting the curve of binding energy near iron in either direction releases energy: fission of heavy nuclei by neutron capture and a chain reaction, and fusion of light nuclei that powers the Sun and needs Lawson's density-confinement criterion to be practical.\n",{"path":8554,"title":8555,"module":8551,"summary":8556},"\u002Fnuclear-physics\u002Fnuclear-reactions\u002Fcompound-nucleus-resonances","The Compound Nucleus and Resonance Reactions","Low-energy reactions proceed through a long-lived intermediate state whose decay forgets how it formed. Bohr's independence hypothesis factorizes the cross section into a formation step and a branching ratio, an isolated level gives the single-level Breit-Wigner line shape with total width Γ tied to the lifetime by Γτ = ħ, and at high excitation overlapping levels merge into a statistical continuum described by evaporation spectra and the Hauser-Feshbach average.\n",{"path":8558,"title":8559,"module":8551,"summary":8560},"\u002Fnuclear-physics\u002Fnuclear-reactions\u002Fdirect-reactions-optical-model","Direct Reactions and the Optical Model","A complex optical potential replaces the many-body target by a single particle moving in an average field whose imaginary part removes flux into non-elastic channels, reproducing the diffraction pattern of elastic scattering. Direct reactions bypass the compound nucleus, transferring a nucleon in one step: stripping and pickup deposit or remove a single nucleon, the angle of the first peak in the distorted-wave angular distribution fixes the transferred orbital angular momentum, and its magnitude gives the spectroscopic factor.\n",{"path":8562,"title":8563,"module":8564,"summary":8565},"\u002Fnuclear-physics\u002Ffission\u002Ffission-barrier-dynamics","The Fission Barrier and Fragment Energetics","Nuclear Fission","Fission is the large-amplitude collective deformation of a heavy nucleus into two fragments. The liquid-drop model sets a barrier from the competition between rising surface energy and falling Coulomb energy under quadrupole deformation, with the fissility parameter Z²\u002FA measuring how close a nucleus is to instability. Bohr-Wheeler theory separates spontaneous from neutron-induced fission, the fragment mass yield is double-humped and asymmetric, about 200 MeV is released per event, and shell corrections add a second minimum that produces fission isomers.\n",{"path":8567,"title":8568,"module":8564,"summary":8569},"\u002Fnuclear-physics\u002Ffission\u002Fchain-reactions-reactor-physics","Chain Reactions and Reactor Physics","A self-sustaining chain reaction is a fixed point of neutron bookkeeping: the multiplication factor k counts the neutrons in one generation per neutron in the last, and criticality is k = 1. The four-factor formula tracks a neutron through fast fission, resonance escape, thermal utilization, and reproduction; moderation slows fission neutrons to the thermal energies where the fission cross section is largest; and the small delayed-neutron fraction sets the timescale that makes a reactor controllable. Breeding converts fertile U-238 and Th-232 into new fissile fuel.\n",{"path":8571,"title":8572,"module":8573,"summary":8574},"\u002Fnuclear-physics\u002Ffusion-nucleosynthesis\u002Ffusion-reactions-confinement","Fusion Reactions and Confinement","Fusion and Nucleosynthesis","Light nuclei release energy when they fuse because binding per nucleon rises steeply toward the iron peak, but the Coulomb barrier suppresses the rate at reactor temperatures. The thermonuclear rate is a convolution of the Maxwell distribution with the tunneling probability, sharply peaked at the Gamow energy. The deuterium-tritium reaction has the lowest barrier and largest cross section; sustained energy gain requires the Lawson triple product of density, temperature, and confinement time, reached by magnetic or inertial confinement.\n",{"path":8576,"title":8577,"module":8573,"summary":8578},"\u002Fnuclear-physics\u002Ffusion-nucleosynthesis\u002Fstellar-nucleosynthesis","Stellar Nucleosynthesis","Main-sequence stars burn hydrogen to helium through the proton-proton chain and the CNO cycle, both releasing 26.7 MeV per helium nucleus. Helium burning bridges the mass-5 and mass-8 gaps by the triple-alpha process through the Beryllium-8 and Hoyle resonances, and successive carbon-to-silicon burning stages climb to the iron peak, where fusion stops. The elements beyond iron are built by slow and rapid neutron capture, and the solar neutrino flux confirms the reactions directly.\n",{"path":8580,"title":8581,"module":8573,"summary":8582},"\u002Fnuclear-physics\u002Ffusion-nucleosynthesis\u002Fbig-bang-nucleosynthesis","Big-Bang Nucleosynthesis","In the first three minutes the expanding universe forged the light elements. The weak interaction froze the neutron-to-proton ratio near one in six when the reaction rate fell below the expansion rate, and free-neutron decay lowered it to about one in seven before the deuterium bottleneck broke. Almost every surviving neutron ended in helium-4, fixing the primordial helium mass fraction near 0.25, with trace deuterium, helium-3, and lithium-7. The deuterium abundance measures the cosmic baryon density.\n",{"path":8584,"title":8585,"module":8586,"summary":8587},"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fcharged-particle-stopping-power","Stopping Power and the Range of Charged Particles","Radiation and Applications","A heavy charged particle loses energy in a dense sequence of small Coulomb collisions with atomic electrons, at a rate the Bethe-Bloch formula fixes from the particle's charge and speed and the medium's electron density and mean excitation energy. The rate scales as the inverse square of the speed, so most energy is deposited at the end of the track in the Bragg peak, and integrating the reciprocal rate gives a sharp range. Electrons differ: they also radiate, and above a critical energy bremsstrahlung dominates. Fast particles above the phase velocity of light in the medium emit Cherenkov radiation.\n",{"path":8589,"title":8590,"module":8586,"summary":8591},"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fphoton-neutron-interactions","Interactions of Photons and Neutrons","Photons are removed from a beam in single events, so their intensity falls exponentially with a linear attenuation coefficient built from three processes: the photoelectric effect at low energy, Compton scattering at intermediate energy, and pair production above twice the electron rest energy, each with its own atomic-number and energy dependence. Neutrons carry no charge and interact only with nuclei, moderating by elastic scattering and being captured with a cross section that rises as one over speed away from resonances.\n",{"path":8593,"title":8594,"module":8586,"summary":8595},"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fradiation-detectors","Radiation Detectors and Nuclear Spectroscopy","Every detector converts the energy a radiation deposits into a measurable electrical signal. Gas counters read the ionization directly, in three operating regions set by the applied voltage; scintillators convert the energy to light read out by a photomultiplier; semiconductor detectors collect electron-hole pairs and give the best energy resolution because so many carriers are made per event. The resolution is governed by the number of independent charge carriers, and the pulse-height spectrum of a gamma line shows a full-energy photopeak, a Compton continuum with its edge, and escape peaks.\n",{"path":8597,"title":8598,"module":8586,"summary":8599},"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fdosimetry-radiation-biology","Dosimetry, Radiation Biology, and Protection","Absorbed dose is the energy deposited per unit mass, measured in gray. Equal absorbed doses do unequal biological damage because densely ionizing radiation deposits its energy along short tracks: weighting the dose by a radiation factor gives the equivalent dose, and weighting by tissue sensitivity gives the effective dose, both in sieverts. Deterministic effects have a threshold and a severity that grows with dose; stochastic effects are assumed to follow a linear-no-threshold probability. Natural background dominates the dose to the population, and protection rests on time, distance, and shielding.\n",{"path":8601,"title":8602,"module":8586,"summary":8603},"\u002Fnuclear-physics\u002Fradiation-matter-applications\u002Fnuclear-applications-dating-medicine","Applications — Dating, Analysis, and Nuclear Medicine","Charged particles lose energy continuously and stop at a well-defined range with a Bragg peak, while gamma rays are attenuated exponentially. These interactions define radiation detectors and dosimetry (gray and sievert) and drive the applications: neutron activation analysis, magnetic resonance imaging, PET, and radiometric dating with carbon-14 and long-lived rock clocks.\n",{"path":8605,"title":8606,"module":6,"summary":6},"\u002Fnuclear-physics","Nuclear Physics",{"path":8608,"title":8609,"module":3628,"summary":8610},"\u002Fnatural-language-processing\u002Ffoundations\u002Fwhat-is-nlp","What Is Natural Language Processing?","Natural language processing is the computational treatment of human language: reading it, representing it, and generating it. We set up why the problem is hard — ambiguity at every level, from sound to intent — trace the field from ELIZA's pattern-matching through statistical methods to today's neural models, lay out the linguistic levels and task families the course covers, and fix the vocabulary of tokens, types, and corpora the rest of the notes rely on.\n",{"path":3630,"title":5,"module":3628,"summary":3646},{"path":8613,"title":8614,"module":3628,"summary":8615},"\u002Fnatural-language-processing\u002Ffoundations\u002Fminimum-edit-distance","Minimum Edit Distance","Much of language processing needs to measure how similar two strings are — a speller ranking corrections, a diff tool, a coreference resolver. Minimum edit distance counts the insertions, deletions, and substitutions that turn one string into another, computed by a dynamic-programming table. We fill the table for intention to execution, backtrace to recover the alignment, and see how the same machinery generalizes to weighted edits, Viterbi, and biological sequence alignment.\n",{"path":8617,"title":8618,"module":3628,"summary":8619},"\u002Fnatural-language-processing\u002Ffoundations\u002Fn-gram-language-models","N-Gram Language Models","A language model assigns a probability to a sequence of words and, equivalently, predicts the next word from its history. The n-gram model makes this tractable by truncating the history to the last few words, estimates the resulting conditional probabilities by counting, and is scored by perplexity. We build the model from the chain rule, work a bigram example on a small corpus, and read perplexity as a branching factor. The next lesson covers the zero counts that break this model and the smoothing that repairs them.\n",{"path":8621,"title":8622,"module":3628,"summary":8623},"\u002Fnatural-language-processing\u002Ffoundations\u002Fsmoothing-and-backoff","Smoothing and Backoff","Every finite corpus is missing good word sequences it simply never saw, so a raw n-gram model assigns them probability zero and breaks. Smoothing repairs the zeros: add-one and add-k shave mass off seen events, backoff and interpolation fall back on shorter contexts, and Kneser-Ney — worked here by hand — replaces raw frequency with how many contexts a word completes. We close on web-scale stupid backoff and the neural models that dissolve the zero problem rather than patch it.\n",{"path":8625,"title":8626,"module":8627,"summary":8628},"\u002Fnatural-language-processing\u002Fclassification\u002Fnaive-bayes-and-sentiment","Naive Bayes and Sentiment Classification","Text Classification","Text classification assigns a category to a document — positive or negative, spam or not, one topic among many. Naive Bayes is a generative solution: apply Bayes' rule, assume the words are conditionally independent given the class, and the winning class is the one maximizing the product of a prior and per-word likelihoods. We train it by counting with add-one smoothing, work a full sentiment example by hand, sharpen it for sentiment (binary counts, negation, lexicons), and place it among the transformer classifiers that came after.\n",{"path":8630,"title":8631,"module":8627,"summary":8632},"\u002Fnatural-language-processing\u002Fclassification\u002Fevaluating-classifiers","Evaluating Classifiers","A trained classifier is only useful once we can measure how good it is. We build the confusion matrix, see why accuracy misleads on unbalanced data, and define precision, recall, and the F-measure that balances them. Multi-class tasks need macro- versus micro-averaging; reliable estimates need cross-validation. We close on statistical significance — the paired bootstrap test for whether one system's lead over another is significant.\n",{"path":8634,"title":8635,"module":8627,"summary":8636},"\u002Fnatural-language-processing\u002Fclassification\u002Flogistic-regression","Logistic Regression","Logistic regression is the discriminative counterpart to naive Bayes: instead of modelling how a document is generated, it learns weights that directly separate the classes. We build it from the sigmoid, derive the cross-entropy loss from maximum likelihood, learn the weights by stochastic gradient descent, regularize to curb overfitting, and generalize to many classes with the softmax. The two-class model is already a one-neuron network, so this is the bridge to neural language models.\n",{"path":3412,"title":8638,"module":8627,"summary":8639},"Sentiment and Affect Lexicons","A sentiment lexicon is a list of words annotated with the affective meaning they carry — positive or negative, or scores along valence, arousal, and dominance. We fix what \"emotion\" means (basic-emotion versus dimensional models), survey the standard lexicons, and then build lexicons three ways: by human labeling with best-worst scaling, by semi-supervised induction from seed words over an embedding space, and by supervised learning from starred reviews. We close on connotation frames, which record the sentiment a verb implies about each of its arguments.\n",{"path":8641,"title":8642,"module":8643,"summary":8644},"\u002Fnatural-language-processing\u002Fsemantics\u002Fvector-semantics-and-embeddings","Vector Semantics and Embeddings","Semantics","Vector semantics represents a word's meaning as a point in space, derived from the company the word keeps. This first part builds the count-based side: the distributional hypothesis, co-occurrence matrices in their term-document and word-word forms, cosine as the similarity measure, and the two weightings — tf-idf and PPMI — that fix what raw counts get wrong. The result is a sparse, interpretable vector for every word, and the setup for the dense embeddings of the next lesson.\n",{"path":8646,"title":8647,"module":8643,"summary":8648},"\u002Fnatural-language-processing\u002Fsemantics\u002Fstatic-word-embeddings","Static Word Embeddings: word2vec and After","Count-based vectors are long and sparse; embeddings are the short, dense alternative. This lesson builds them with word2vec's skip-gram and negative sampling — a classifier whose learned weights are the vectors — derives its gradient, and works one update by hand. It then reads relations off the analogy parallelogram, surveys the papers that framed the static-embedding era (word2vec, GloVe, the SGNS-as-PPMI equivalence, fastText, ELMo), and closes on the biases embeddings inherit and the single-vector-per-word ceiling that contextual models break.\n",{"path":8650,"title":8651,"module":8643,"summary":8652},"\u002Fnatural-language-processing\u002Fsemantics\u002Fneural-language-models","Neural Networks and Neural Language Models","A neural network is a stack of units, each a weighted sum passed through a non-linearity — a single unit on its own is logistic regression. We build the network up from that unit: the activation functions that give it power, the XOR problem that forces a hidden layer, the feedforward forward pass in matrix form, and the Bengio-style feedforward neural language model that concatenates word embeddings and predicts the next word with a softmax. Training is cross-entropy minimized by gradient descent, with backpropagation supplying the gradient. Embeddings let the model share statistical strength across similar words, avoiding the sparsity that limits n-gram models.\n",{"path":8654,"title":8655,"module":5030,"summary":8656},"\u002Fnatural-language-processing\u002Fsequences\u002Fsequence-labeling","Sequence Labeling: POS and NER","Sequence labeling assigns one tag to every token in a sentence. This first part sets up the task through its two canonical cases — part-of-speech tagging over the Penn Treebank tagset, and named-entity recognition reframed as token labeling with the BIO scheme — then builds the hidden Markov model, the classic probabilistic tagger. The HMM tags by Bayesian inference: transition and emission probabilities under two Markov assumptions, reducing tagging to an argmax over tag sequences. That argmax is exponential to enumerate, which sets up the Viterbi decoder, the CRF, and neural taggers of the next lesson.\n",{"path":8658,"title":8659,"module":5030,"summary":8660},"\u002Fnatural-language-processing\u002Fsequences\u002Fcrfs-and-neural-taggers","Viterbi Decoding, CRFs, and Neural Taggers","The HMM reduced tagging to an argmax over exponentially many tag sequences. This lesson builds the decoder that makes it tractable — the Viterbi dynamic program, worked through a full numeric trace on real WSJ probabilities — then keeps that same decoder while replacing the HMM's rigid tables. The linear-chain conditional random field is a discriminative log-linear model whose global feature functions can inspect any part of the input, which is why CRFs win for NER. Finally it traces the shift to neural taggers (biLSTM-CRF, character-aware NER, ELMo), where hand-built features become learned representations while the Viterbi decoder carries over unchanged.\n",{"path":8662,"title":8663,"module":5030,"summary":8664},"\u002Fnatural-language-processing\u002Fsequences\u002Frnns-and-lstms","RNNs and LSTMs","A feedforward neural language model sees a fixed window of words and can look no further back. The recurrent neural network removes that limit: it carries a hidden state across time, so each word is read in the context of everything before it. We build the RNN from its one recurrent equation, use it as a language model, train it by backpropagation through time, and diagnose the vanishing-gradient problem that makes plain RNNs forget. The LSTM fixes the forgetting with a cell state and three gates, and the encoder-decoder stacks two RNNs into a sequence-to-sequence model — and its single-vector bottleneck is the problem attention was invented to remove.\n",{"path":8666,"title":8667,"module":5512,"summary":8668},"\u002Fnatural-language-processing\u002Ftransformers\u002Ftransformers-and-attention","Transformers and Self-Attention","Recurrence forced language models to read one word at a time and to squeeze every dependency through a chain of hidden states. Self-attention removes the recurrence: at every layer each position compares itself to every other and reads a weighted mixture of them, in a single parallel step. This first part builds the attention operation from the ground up — the soft lookup, queries and keys and values, the scaled dot-product, the numeric trace, the matrix form, and the causal mask — and sets up the full transformer architecture that follows.\n",{"path":8670,"title":7224,"module":5512,"summary":8671},"\u002Fnatural-language-processing\u002Ftransformers\u002Fthe-transformer-architecture","This part takes the scaled dot-product attention of the previous lesson and assembles the full transformer architecture around it: multi-head attention so several relations can be read at once, the transformer block of residual connections and layer norm that makes deep stacks trainable, positional embeddings that restore word order, the decoder-only language model, and the encoder, decoder, and encoder-decoder shapes — closing with the 2017 paper and the pre-norm, FlashAttention, and RoPE refinements that scaled it up.\n",{"path":8673,"title":7332,"module":5512,"summary":8674},"\u002Fnatural-language-processing\u002Ftransformers\u002Flarge-language-models","A large language model is a decoder-only transformer trained on one objective — predict the next token. This first part assembles the inference side: the language-modeling head that turns a hidden state into a distribution over the vocabulary, autoregressive generation, and the decoding strategies — greedy, beam, and sampling with temperature, top-k, and nucleus — that read text back out of that distribution. Training the distribution at web scale comes next.\n",{"path":8676,"title":8677,"module":5512,"summary":8678},"\u002Fnatural-language-processing\u002Ftransformers\u002Fllm-pretraining-and-scaling","Large Language Models: Pretraining and Scaling","A language model's next-token distribution is only as good as the parameters behind it. This part is where those parameters come from: self-supervised pretraining on web-scale text with teacher forcing and cross-entropy, the scaling laws that make test loss a predictable power law in parameters, data, and compute, the KV cache that keeps long-context inference affordable, and how a finished model is evaluated by perplexity and benchmarks — closing with the Kaplan, Chinchilla, GPT-3, and emergence papers behind the scaling story.\n",{"path":8680,"title":8681,"module":5512,"summary":8682},"\u002Fnatural-language-processing\u002Ftransformers\u002Ffine-tuning-and-prompting","Fine-Tuning and Prompting","A pretrained transformer is a general-purpose knowledge source; a task is what you do with it. There are two ways to adapt one, and this first part covers the one that updates the weights: fine-tuning. A bidirectional encoder like BERT is pretrained by masked language modeling, then a small task head is bolted on and the whole thing is trained on labelled data for classification, sequence labeling, or span-based question answering — with parameter-efficient variants (adapters, LoRA) that touch only a sliver of the weights. Prompting, the family that leaves the weights frozen, comes next.\n",{"path":8684,"title":8685,"module":5512,"summary":8686},"\u002Fnatural-language-processing\u002Ftransformers\u002Fprompting-and-alignment","Prompting and Alignment","Fine-tuning adapts a model by changing its weights. The second family of adaptation changes nothing: a large frozen model performs a task from an instruction and a few examples placed in its context. This part covers prompting and in-context learning, chain-of-thought that elicits reasoning, and the two training stages — instruction tuning and RLHF — that turn a fluent base predictor into an aligned assistant, closing with the BERT, LoRA, chain-of-thought, InstructGPT, and retrieval-augmentation papers behind the modern adaptation pipeline.\n",{"path":8688,"title":8689,"module":8690,"summary":8691},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fconstituency-parsing","Constituency Parsing","Linguistic Structure","A constituency parse groups a sentence into nested phrases described by a context-free grammar. We build the CFG formalism, read the phrase structure of English off a treebank, confront the structural ambiguity that makes parsing hard, convert to Chomsky normal form, and then solve it with CKY — the dynamic-programming chart that fills a triangular table bottom-up. Probabilistic and neural span parsers, evaluation, and shallow parsing follow in the companion lesson.\n",{"path":8693,"title":8694,"module":8690,"summary":8695},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcky-scoring-and-evaluation","CKY Scoring, Evaluation, and Shallow Parsing","The CKY chart returns every parse but does not say which is correct. Disambiguation needs a score on trees. This lesson attaches probabilities to a grammar (the PCFG and lexicalization), replaces the grammar with a neural span scorer over a pretrained encoder, states the self-attentive results that made it the state of the art, evaluates parsers against a treebank with PARSEVAL, and closes with chunking and shallow parsing for tasks that need only the flat phrases.\n",{"path":8697,"title":8698,"module":8690,"summary":8699},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fdependency-parsing","Dependency Parsing","A dependency parse throws away phrases and keeps only directed, labeled arcs from heads to their dependents, so the subject and object of a verb hang off the verb directly. We fix the formalism (rooted trees, typed Universal-Dependency relations, projectivity), then build the first parser family: transition-based arc-standard and arc-eager parsing, a greedy stack-and-buffer machine trained from an oracle. Graph-based and neural dependency parsing follow in the companion lesson.\n",{"path":8701,"title":8702,"module":8690,"summary":8703},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fgraph-based-and-neural-dependency-parsing","Graph-Based and Neural Dependency Parsing","Greedy transition parsing commits locally; the graph-based family scores whole trees instead. This lesson scores every candidate head-dependent edge and extracts the maximum spanning tree with Chu-Liu\u002FEdmonds, develops the biaffine neural scorer that made graph-based parsing the accuracy leader, evaluates parsers with the unlabeled and labeled attachment scores (UAS and LAS), and closes on where the two parser families sit and what they feed downstream.\n",{"path":8705,"title":8706,"module":8690,"summary":8707},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fword-senses-and-wsd","Word Senses and Disambiguation","A word is not an atom of meaning: \"bass\" names a fish, a voice, and an instrument, and one static embedding blurs them into a single point. This lesson pulls those senses apart. We define polysemy and the relations that organize senses — synonymy, antonymy, hyponymy, meronymy — build them into WordNet's synset graph, measure similarity along that graph, and then solve the core of word sense disambiguation: the most-frequent-sense baseline, the Lesk gloss-overlap algorithm, feature-based classifiers, and the nearest-neighbor method over BERT embeddings. WSD variants, embeddings, and evaluation follow in the companion lesson.\n",{"path":8709,"title":8710,"module":8690,"summary":8711},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fwsd-in-practice-and-induction","WSD in Practice and Word Sense Induction","Beyond core word sense disambiguation lie the variants and loose ends: the sense-inventory-free Word-in-Context task, retrofitting static embeddings to a thesaurus, discovering senses without a fixed inventory (word sense induction), the gloss-aware and bi-encoder neural systems that hold the state of the art, and how WSD and its cousins are evaluated. Together they connect one-vector-per-word embeddings to sense-aware contextual representations.\n",{"path":8713,"title":8714,"module":8690,"summary":8715},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fsemantic-roles-and-information-extraction","Semantic Roles and Information Extraction","Semantic roles answer \"who did what to whom\" for a single event, abstracting away the syntax that expresses it. We show why syntax alone is not enough, generalize over diathesis alternations with thematic roles, number a predicate's arguments with PropBank and group predicates into frames with FrameNet, tag each argument automatically with semantic role labeling, and factor predicates into primitives. Information extraction scales the idea to a corpus in the companion lesson.\n",{"path":8717,"title":8718,"module":8690,"summary":8719},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Frelations-events-and-templates","Relations, Events, and Templates","Semantic roles answer \"who did what\" for one predicate; information extraction scales the idea to a whole corpus. This lesson turns unstructured text into structured data: relation extraction pulls entity-relation-entity triples out of sentences by patterns, supervision, and distant supervision; event and temporal extraction place those facts on a timeline; and template filling and knowledge-base population assemble them into a database a downstream system can query.\n",{"path":8721,"title":8722,"module":8690,"summary":8723},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcoreference-and-discourse","Coreference and Discourse","A text is more than a bag of sentences: entities recur under different names. Coreference resolution links every mention to the discourse entity it evokes — the linguistic background of pronouns, definite NPs, and names; mention detection; the mention-pair, mention-ranking, and entity-based architectures; a neural end-to-end span model that scores candidate antecedents; features, evaluation by the CoNLL F1, gender bias, and the neural coreference lineage. Discourse coherence follows in the companion lesson.\n",{"path":8725,"title":8726,"module":8690,"summary":8727},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcoherence-and-discourse-structure","Coherence and Discourse Structure","Coherence is what makes a run of sentences a discourse rather than an arbitrary collection. This lesson develops coherence relations and Rhetorical Structure Theory trees, discourse-structure parsing, Centering and the entity grid for entity-based coherence, and representation-learning models of local coherence, measured in part over the coreference chains recovered in the companion lesson.\n",{"path":8729,"title":8730,"module":8690,"summary":8731},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Flogical-semantics","Logical Representations of Meaning","A meaning representation turns a sentence into a formal structure a machine can check against a world and reason over. We set the desiderata a good representation must meet, ground truth in a model, build up first-order logic for sentences with its connectives, quantifiers, and inference, and reify events with the neo-Davidsonian event variable to escape fixed predicate arity. The compositional lambda calculus, quantifier scope, and description logics follow in the companion lesson.\n",{"path":8733,"title":8734,"module":8690,"summary":8735},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fcompositional-semantics-and-description-logics","Compositional Semantics and Description Logics","How do you compute a logical form from a sentence automatically? This lesson builds the compositional machinery: the lambda calculus that assembles a formula from a parse tree one beta-reduction at a time, the quantifier-scope ambiguity a single syntax tree leaves open, and the decidable description logics — TBox, ABox, subsumption, role restrictions — behind the Web Ontology Language, closing with how the map from string to logical form can be learned.\n",{"path":8737,"title":8738,"module":8690,"summary":8739},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fsemantic-parsing","Semantic Parsing","Turning a sentence into a structured, executable meaning, the grammar-based way. We take the logical forms defined earlier and build them compositionally: a rule-based parser that walks a syntax tree applying lambda terms, then Combinatory Categorial Grammar (CCG), which fuses syntax and semantics so one lexicalized derivation produces both — including supertagging and A* parsing. Learned and neural semantic parsers follow in the companion lesson.\n",{"path":8741,"title":8742,"module":8690,"summary":8743},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fneural-semantic-parsing","Learned and Neural Semantic Parsing","Hand-writing a lexicon of lambda terms does not scale, so this lesson learns the parser instead. We cover the two supervision regimes (from logical forms and from denotations), Abstract Meaning Representation as a rooted concept graph, neural sequence-to-sequence parsing with constrained decoding and copy mechanisms, executable text-to-SQL and knowledge-based question answering, the practical systems that made learned parsers accurate, and how the task is evaluated.\n",{"path":8745,"title":8746,"module":8690,"summary":8747},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Finformation-extraction","Information Extraction","Information extraction turns free text into a database, and the first step is relation extraction: pulling entity-relation-entity triples out of sentences. We cover all five families — hand-built patterns, supervised classifiers, semi-supervised bootstrapping, distant supervision, and unsupervised Open IE — with worked bootstrapping and distant-supervision traces, then the neural and LLM systems that extended them. Times, events, and templates follow in the companion lesson.\n",{"path":8749,"title":8750,"module":8690,"summary":8751},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Ftimes-events-and-templates","Extracting Times, Events, and Templates","Once relation extraction has produced typed triples, the information-extraction pipeline still has to place facts in time and assemble them into records. This lesson detects and normalizes temporal expressions to ISO 8601 values, detects events and orders them on a timeline with the 13 Allen relations, and fills slot-and-filler templates — flat and hierarchical — for stereotyped situations, closing the loop from text to a queryable database.\n",{"path":8753,"title":8754,"module":8690,"summary":8755},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fdiscourse-coherence","Discourse Coherence","A text is more than a set of sentences. What binds a run of sentences into a discourse is coherence, and one of its sources is structured relations between clauses. This lesson develops relational coherence — RST and the PDTB models of coherence relations — and discourse-structure parsing: EDU segmentation and shift-reduce RST parsing, then PDTB relation classification. Entity-based and global coherence follow in the companion lesson.\n",{"path":8757,"title":8758,"module":8690,"summary":8759},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fentity-based-and-global-coherence","Entity-Based and Global Coherence","A text coheres not only through relations between clauses but by staying about the same entities and the same topic, and by obeying the macro-structure of its genre. This lesson develops Centering Theory and the entity grid for entity-based coherence, representation-learning models of local coherence, and global coherence — topic segmentation, narrative and argumentation structure, and scientific discourse — then the neural models that learn each.\n",{"path":8761,"title":8762,"module":8690,"summary":8763},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Fconstituency-grammars","Constituency Grammars","A constituency grammar is the declarative theory of sentence structure that a parser operates on. We build the context-free grammar formalism from its four parts, show how derivations become parse trees, and work through the phrase structure of English — noun phrases, verb phrases and their subcategorization frames, agreement, coordination, and long-distance dependencies. The treebank, normal-form, and lexicalized views follow in the companion lesson.\n",{"path":8765,"title":8766,"module":8690,"summary":8767},"\u002Fnatural-language-processing\u002Flinguistic-structure\u002Ftreebanks-and-lexicalized-grammars","Treebanks and Lexicalized Grammars","Where does a grammar come from, and how is it prepared for a parser? We read a context-free grammar off the Penn Treebank, normalize it to Chomsky Normal Form for the CKY chart, then invert the phrase-structure emphasis with lexicalized grammars — Combinatory Categorial Grammar and its slash categories — and close with the grammar's fate in the neural era: span scoring, self-attention, and grammar induction.\n",{"path":8769,"title":8770,"module":7320,"summary":8771},"\u002Fnatural-language-processing\u002Fapplications\u002Fmachine-translation","Machine Translation","Machine translation is the task that built the modern toolkit: the encoder-decoder was invented for it, attention was invented to fix its fixed-context bottleneck, and both were later folded into the general transformer. We work through why translation is hard (word order, morphology, lexical and structural divergences), the sequence-to-sequence model and its attention mechanism, transformer-based NMT with cross-attention, subword tokenization with a shared vocabulary, beam-search decoding, and evaluation by BLEU and its successors chrF, BERTScore, and COMET — closing on multilingual and low-resource translation and backtranslation.\n",{"path":8773,"title":8774,"module":7320,"summary":8775},"\u002Fnatural-language-processing\u002Fapplications\u002Fmachine-translation-decoding-and-evaluation","Machine Translation: Decoding, Evaluation, and Scale","Having built the transformer translation model, we now decode from it and measure the output. Beam search turns the decoder's per-step distributions into a single output string; length normalization keeps it from favoring short translations. We then score translations automatically — BLEU with its n-gram precision, clipping, and brevity penalty, worked through by hand, then its successors chrF, BERTScore, and COMET — and close on the parts of MT that scale beyond one language pair: multilingual and low-resource translation, backtranslation, gender bias, and the lineage from the Transformer to massively multilingual models like NLLB-200.\n",{"path":8777,"title":8778,"module":7320,"summary":8779},"\u002Fnatural-language-processing\u002Fapplications\u002Fquestion-answering","Question Answering","A question-answering system takes a natural-language question and returns an answer, not a ranked list of documents. Almost every modern system is built on one pattern: retrieve then read. We start with the information-retrieval machinery that finds candidate text — tf-idf and BM25 term weighting, a worked ranking example, the inverted index, and dense embedding retrieval — then build the retriever-reader pipeline that extracts an answer span with BERT and trace a full retrieve-and-read example end to end.\n",{"path":8781,"title":8782,"module":7320,"summary":8783},"\u002Fnatural-language-processing\u002Fapplications\u002Fquestion-answering-knowledge-and-llms","Question Answering: Knowledge Bases and Language Models","The retrieve-and-read pipeline extracts an answer span from prose, but not all knowledge lives in prose. This part covers the rest of the QA stack: entity linking (Wikification) that grounds a question's entities to a knowledge base, knowledge-based QA by semantic parsing a question into an executable query, and the modern default — closed-book QA and retrieval-augmented generation with a large language model — closing on the DPR\u002FRAG\u002Ffusion-in-decoder lineage and how factoid answers are scored by exact match and F1.\n",{"path":8785,"title":8786,"module":7320,"summary":8787},"\u002Fnatural-language-processing\u002Fapplications\u002Fdialogue-and-chatbots","Dialogue and Chatbots","Conversation is the most natural interface to a machine and one of the hardest to build. We set up what makes human dialogue work — turns, speech acts, grounding, and the local structure of adjacency pairs — then trace the two traditions that answer it: chatbots built to chat (ELIZA's pattern-matching, corpus retrieval, and seq2seq generation with its blandness problem) and task-oriented systems built to get something done (the GUS frame-and-slot architecture and the modern NLU \u002F state-tracker \u002F policy \u002F NLG pipeline that accumulates a frame across turns).\n",{"path":8789,"title":8790,"module":7320,"summary":8791},"\u002Fnatural-language-processing\u002Fapplications\u002Fdialogue-systems-and-assistants","Dialogue Systems: LLM Assistants, Evaluation, and Design","Two dialogue traditions — chatbots built to chat and task-oriented frame systems built to get something done — met in the aligned LLM assistant. Instruction tuning plus RLHF fold chit-chat and task dialogue into one model; the LaMDA \u002F InstructGPT \u002F ChatGPT lineage fills in how. The lesson then turns to evaluation (human ratings and acute-eval for chatbots, task success and slot error rate for task systems), user-centered design with Wizard-of-Oz prototyping, and the ethical stakes of building agents people talk to.\n",{"path":8793,"title":8794,"module":7320,"summary":8795},"\u002Fnatural-language-processing\u002Fapplications\u002Ftext-summarization","Text Summarization","Summarization compresses a document to its essential meaning, by either selecting sentences to keep (extractive) or writing new ones (abstractive). This part fixes the task and its flavors — single vs. multi-document, generic vs. query-focused, extractive vs. abstractive — then works through extractive summarization in full: scoring by position and centrality, the TextRank\u002FLexRank graph algorithm run as PageRank over a sentence-similarity graph with a worked iteration, and supervised sentence selection.\n",{"path":8797,"title":8798,"module":7320,"summary":8799},"\u002Fnatural-language-processing\u002Fapplications\u002Fabstractive-summarization-and-evaluation","Abstractive Summarization and Evaluation","Extractive methods can only reuse the source's own sentences; to compress within a sentence or paraphrase, a summarizer has to generate. This part covers abstractive summarization: the sequence-to-sequence approach, the pointer-generator's copy switch and coverage mechanism, pretrained summarizers (BART, PEGASUS) and zero-shot LLM prompting, the long-document and factuality problems, and ROUGE evaluation with a worked example and its limits — closing on the abstractive lineage from See 2017 through faithfulness metrics.\n",{"path":8801,"title":8802,"module":8803,"summary":8804},"\u002Fnatural-language-processing\u002Fspeech\u002Fphonetics","Phonetics","Speech","Before a recognizer can read speech it has to know what speech is. This first part covers the linguistic substrate: phones and their transcription in the IPA and ARPAbet; articulatory phonetics — how the vocal tract shapes airflow into consonants and vowels; and prosody — stress, tune, and the F0 contour. The acoustic side — the waveform, its spectrum, formants, and the spectrogram — is the second part.\n",{"path":8806,"title":8807,"module":8803,"summary":8808},"\u002Fnatural-language-processing\u002Fspeech\u002Facoustic-phonetics","Acoustic Phonetics","Articulation is the cause; the acoustic signal is the effect, and the effect is all a microphone ever gets. This part follows the sound out of the mouth: waves, sampling and the Nyquist limit, F0 and the pitch track, the mel scale, the spectrum and Fourier analysis, the source-filter model that explains why each vowel carries its own formants, and the spectrogram the log-mel front end of every ASR system sits directly on top of — closing with neural TTS, wav2vec, HuBERT, and Whisper, where phonetics went in neural speech.\n",{"path":8810,"title":8811,"module":8803,"summary":8812},"\u002Fnatural-language-processing\u002Fspeech\u002Fautomatic-speech-recognition","Automatic Speech Recognition","Speech recognition maps an acoustic waveform to a string of words, and once the waveform is turned into a sequence of log-mel spectrogram frames the problem is the same sequence-to-sequence transduction the rest of the course already solved. This first part builds the feature front end (framing, the DFT, the mel filterbank, the log), then the modern architectures: the attention-based encoder-decoder, the CTC alignment trick that collapses repeated and blank frames, and RNN-T for streaming. Training-data advances, evaluation, TTS, and the other speech tasks come next.\n",{"path":8814,"title":8815,"module":8803,"summary":8816},"\u002Fnatural-language-processing\u002Fspeech\u002Fasr-evaluation-and-applications","ASR Evaluation and Speech Applications","A recognizer turns a waveform into text; this part scores that text and puts the same machinery to other uses. It opens with the self-supervised and weakly- supervised systems (wav2vec 2.0, HuBERT, Whisper) that made ASR error rates fall. Word error rate reuses the edit distance from the first module, run over words. Text-to-speech runs the whole pipeline in reverse — text to mel spectrogram to waveform. And a family of smaller tasks — wake-word detection, speaker recognition and diarization, language identification — reuse the same log-mel front end without the decoder.\n",{"path":8818,"title":8819,"module":6,"summary":6},"\u002Fnatural-language-processing","Natural Language Processing",{"path":8821,"title":8822,"module":3628,"summary":8823},"\u002Fparticle-physics\u002Ffoundations\u002Fhistorical-overview-particle-zoo","From the Electron to the Particle Zoo","A timeline of the subject, from J. J. Thomson's electron in 1897 to the Higgs boson in 2012. The electron, photon, nucleus, proton, and neutron gave a tidy picture that Yukawa's meson prediction and the muon–pion confusion complicated; strange particles in cosmic rays and the accelerator-era flood of hadrons then produced a \"particle zoo\" that only the quark model organized.\n",{"path":8825,"title":8826,"module":3628,"summary":8827},"\u002Fparticle-physics\u002Ffoundations\u002Fparticle-physics-basic-concepts","Basic Concepts and Particle Classification","Every particle has an antiparticle of equal mass and opposite charge, a consequence of the Dirac equation confirmed by the positron. Feynman diagrams track interactions in spacetime; the material particles sort into leptons and the composite hadrons built from quarks, with baryons carrying three quarks and mesons a quark-antiquark pair.\n",{"path":8829,"title":8830,"module":3628,"summary":8831},"\u002Fparticle-physics\u002Ffoundations\u002Ffundamental-interactions-force-carriers","Fundamental Interactions and Force Carriers","Four interactions account for every force in nature: strong, electromagnetic, weak, and gravitational, in decreasing strength. Each is carried by a boson — the gluon, photon, W and Z, and the graviton — with a range fixed by the carrier's mass through the Yukawa relation, and a coupling constant that itself varies with distance.\n",{"path":8833,"title":8834,"module":8835,"summary":8836},"\u002Fparticle-physics\u002Funits-kinematics\u002Fnatural-units-and-scales","Natural Units and Scales","Units and Kinematics","Setting $\\hbar = c = 1$ collapses mass, momentum, and energy into a single unit, the GeV, and turns lengths and times into inverse energies through the conversion $\\hbar c = 197.3$ MeV·fm. This lesson fixes the natural-unit conventions used for the rest of the course, converts cross sections between barns and GeV$^{-2}$, and shows how to restore factors of $\\hbar$ and $c$ by dimensional analysis.\n",{"path":8838,"title":8839,"module":8835,"summary":8840},"\u002Fparticle-physics\u002Funits-kinematics\u002Ffour-vectors-invariant-mass","Four-Vectors and Invariant Mass","The energy and momentum of a particle form a four-vector whose square is the frame-independent quantity $p^2 = m^2$. This lesson develops the metric and four-vector products, the invariant mass of a multiparticle system, the center-of-momentum and laboratory frames, and the description of collinear boosts by rapidity, whose additivity replaces the awkward velocity-addition law.\n",{"path":8842,"title":8843,"module":8835,"summary":8844},"\u002Fparticle-physics\u002Funits-kinematics\u002Fdecay-scattering-kinematics-mandelstam","Decay, Scattering, and Mandelstam Variables","Two-body decay in the rest frame fixes the daughter momenta from the three masses alone; production thresholds follow from the minimum invariant mass. This lesson works both, then introduces the Mandelstam invariants $s$, $t$, $u$ for $2\\to2$ scattering, proves the identity $s+t+u=\\sum m_i^2$, and maps the physical regions and the crossing that relates channels.\n",{"path":8846,"title":8847,"module":8835,"summary":8848},"\u002Fparticle-physics\u002Funits-kinematics\u002Fcross-sections-golden-rule","Cross Sections and the Golden Rule","The cross section measures how often a scattering happens and the decay width how fast a particle disintegrates. This lesson defines both, relates event rate to luminosity through $R=\\mathcal L\\,\\sigma$ and lifetime to width through $\\tau=\\hbar\u002F\\Gamma$, and states Fermi's golden rule with Lorentz-invariant phase space, giving the master formulas that turn an amplitude $\\mathcal M$ into a measurable rate for $1\\to2$ decay and $2\\to2$ scattering.\n",{"path":8850,"title":8851,"module":8852,"summary":8853},"\u002Fparticle-physics\u002Fsymmetries\u002Fconservation-laws-symmetries","Conservation Laws and Symmetries","Symmetries and Conservation Laws","Which decays occur is decided by conservation laws, each tied by Noether's theorem to a symmetry of physical law. Energy, charge, baryon number, and lepton number are conserved universally; strangeness, isospin, and parity hold in the strong and electromagnetic interactions but break in the weak one, whose parity and CP violation distinguish matter from antimatter.\n",{"path":8855,"title":8856,"module":8852,"summary":8857},"\u002Fparticle-physics\u002Fsymmetries\u002Fdiscrete-symmetries-cpt","Discrete Symmetries — C, P, T, and CPT","Parity reflects space, charge conjugation swaps particle for antiparticle, and time reversal runs the clock backward. Each assigns multiplicative quantum numbers that act as selection rules — intrinsic parities, the photon's C = −1, the C-parity argument fixing the pion's two-photon decay. Their product CPT is a theorem of any local relativistic field theory, forcing particle and antiparticle to share mass and lifetime.\n",{"path":8859,"title":8860,"module":8852,"summary":8861},"\u002Fparticle-physics\u002Fsymmetries\u002Fparity-violation-weak","Parity Violation and the Weak Force","The tau–theta puzzle forced a choice: two particles with identical mass but opposite parity, or one particle whose decay violates parity. Lee and Yang proposed the latter, Wu's polarized cobalt-60 confirmed it, and the violation proved maximal. The charged weak force couples only to left-handed chirality — the Goldhaber experiment showed the neutrino is left-handed — which is why the mirror image of a weak decay is something nature never produces.\n",{"path":8863,"title":8864,"module":8852,"summary":8865},"\u002Fparticle-physics\u002Fsymmetries\u002Fsu2-su3-flavor-symmetry","Isospin, SU(2), and Flavor SU(3)","The near-equal masses of the proton and neutron, and of the three pions, signal a continuous internal symmetry of the strong force: isospin, an SU(2) whose ladder operators move between the members of a multiplet. Adding strangeness enlarges it to an approximate SU(3) flavor symmetry, and the Gell-Mann–Nishijima relation Q = I3 + Y\u002F2 places every hadron on a weight diagram in the isospin–hypercharge plane — the language in which the quark model is written.\n",{"path":8867,"title":8868,"module":8869,"summary":8870},"\u002Fparticle-physics\u002Fquark-model\u002Feightfold-way-su3","The Eightfold Way and SU(3) Flavor","The Quark Model","Gell-Mann and Ne'eman's classification of the hadrons into geometric multiplets, read as representations of an approximate flavor SU(3). The fundamental triplet (u, d, s) and its antitriplet combine into the meson nonet from 3⊗3̄ = 8⊕1 and the baryon octet and decuplet from 3⊗3⊗3, and the empty corner of the decuplet forecast the Ω⁻.\n",{"path":8872,"title":8873,"module":8869,"summary":8874},"\u002Fparticle-physics\u002Fquark-model\u002Fmeson-spectroscopy","Meson Multiplets and Quantum Numbers","Mesons as quark–antiquark bound states. The spin singlet and triplet, orbital excitations, and the assignment of J^PC from the quark spins and orbital angular momentum, giving the pseudoscalar and vector nonets. The η–η' and ω–φ mixing problems, and the charmonium and bottomonium spectra read as heavy-quark positronium.\n",{"path":8876,"title":8877,"module":8869,"summary":8878},"\u002Fparticle-physics\u002Fquark-model\u002Fbaryon-spectroscopy","Baryon Multiplets, Spin, and the Color Puzzle","Baryons as three-quark states, with a wavefunction factored into space, spin, flavor, and color. The spin-3\u002F2 Δ⁺⁺ = uuu forces a totally symmetric state that the Pauli principle forbids, and the resolution is an antisymmetric color factor — the first evidence for color. The octet and decuplet spin content, and baryon magnetic moments as a quantitative test of the model.\n",{"path":8880,"title":8881,"module":8869,"summary":8882},"\u002Fparticle-physics\u002Fquark-model\u002Fcolor-confinement-exotics","Color, Confinement, and Exotic Hadrons","Color as the gauged SU(3) charge, and the requirement that every physical hadron be a color singlet — which selects q-qbar mesons and qqq baryons as the simplest states. The R-ratio of e⁺e⁻ annihilation measures three colors directly. Beyond the simplest singlets lie glueballs, tetraquarks, and pentaquarks, and the recent XYZ states, read as either compact multiquarks or loose hadronic molecules.\n",{"path":8884,"title":8885,"module":8886,"summary":8887},"\u002Fparticle-physics\u002Frelativistic-wave-equations\u002Fklein-gordon-equation","The Klein-Gordon Equation","Relativistic Wave Equations","Quantizing the relativistic energy relation $E^2 = p^2 + m^2$ produces the Klein-Gordon equation for a scalar field. Its plane-wave solutions come in positive- and negative-energy branches, and the conserved density it supplies is not positive-definite — the two difficulties that first drove physicists to seek a first-order equation. The static Klein-Gordon equation with a point source gives the Yukawa potential, and the free equation gives the scalar propagator that later modules attach to exchanged lines.\n",{"path":8889,"title":8890,"module":8886,"summary":8891},"\u002Fparticle-physics\u002Frelativistic-wave-equations\u002Fdirac-equation-spinors","The Dirac Equation and Spinors","Dirac demanded a wave equation first order in time to fix the Klein-Gordon density problem. Factorizing $E^2 = p^2 + m^2$ into a linear form forces the coefficients to be anticommuting matrices — the gamma matrices of the Clifford algebra — so the wavefunction becomes a four-component spinor. The plane-wave solutions split into two particle and two antiparticle states, spin appears automatically with the correct $g = 2$ magnetic moment, and the chirality projectors that the weak interaction later needs fall straight out of the fifth gamma matrix.\n",{"path":8893,"title":8894,"module":8886,"summary":8895},"\u002Fparticle-physics\u002Frelativistic-wave-equations\u002Fantiparticles-hole-theory","Antiparticles and Hole Theory","The negative-energy solutions of the Dirac equation refuse to go away, so they must mean something. Dirac read them as a filled sea of occupied negative-energy states whose holes are positive-energy antiparticles, predicting the positron before its discovery. The picture works for fermions but not bosons, and the Feynman-Stückelberg interpretation replaces it: an antiparticle is a negative-energy solution propagating backward in time, equivalent to a positive-energy antiparticle going forward. Crossing symmetry ties incoming particles to outgoing antiparticles in a single amplitude.\n",{"path":8897,"title":8898,"module":8899,"summary":8900},"\u002Fparticle-physics\u002Fqed\u002Ffeynman-rules-qed","Feynman Rules for QED","Quantum Electrodynamics","Quantum electrodynamics computes a process by summing diagrams, each a term in a power series in the coupling. Every diagram translates into an amplitude by a fixed dictionary: spinors and polarization vectors for external lines, propagators for internal lines, and the vertex factor $ie\\gamma^\\mu$ for each photon-fermion junction. Squaring the amplitude and feeding it to Fermi's golden rule produces a cross section or decay rate, with each extra vertex costing one power of $\\alpha$.\n",{"path":8902,"title":8903,"module":8899,"summary":8904},"\u002Fparticle-physics\u002Fqed\u002Fqed-tree-processes","Tree-Level QED Processes","The Feynman rules become numbers on the reference reactions of QED. Muon pair production $e^+e^-\\to\\mu^+\\mu^-$ sets the scale with its $1+\\cos^2\\theta$ distribution and $4\\pi\\alpha^2\u002F3s$ total cross section, and its ratio to hadron production counts colors. Compton scattering gives the Klein-Nishina formula and the Thomson limit; Bhabha scattering shows $s$- and $t$-channel interference. Casimir's trick turns every spin-averaged square into a trace of gamma matrices.\n",{"path":8906,"title":8907,"module":8899,"summary":8908},"\u002Fparticle-physics\u002Fqed\u002Frenormalization-running-coupling","Renormalization and the Running Coupling","Beyond tree level, QED loops diverge. The three primitive one-loop diagrams — vacuum polarization, electron self-energy, and vertex correction — carry ultraviolet divergences that regularization exposes as logarithms of a cutoff. Renormalization absorbs them into the measured mass, charge, and field normalization, leaving finite predictions. The surviving physical content is that the coupling runs: vacuum polarization screens charge, so $\\alpha$ grows from $1\u002F137$ at low energy to about $1\u002F128$ at the $Z$ mass.\n",{"path":8910,"title":8911,"module":8899,"summary":8912},"\u002Fparticle-physics\u002Fqed\u002Felectron-g-2","The Anomalous Magnetic Moment","The Dirac equation predicts $g=2$; loops shift it. Schwinger's one-loop vertex correction gives the anomaly $a=(g-2)\u002F2=\\alpha\u002F2\\pi$, and the QED series continues to five loops. The electron $a_e$ agrees with theory to better than a part in a billion, the most precise confrontation of theory and experiment in physics. The muon $a_\\mu$, heavier and so more sensitive to virtual heavy states, is dominated by hadronic uncertainty and sits at the center of a long-running comparison with the Standard Model prediction.\n",{"path":8914,"title":8915,"module":8916,"summary":8917},"\u002Fparticle-physics\u002Fweak-interaction\u002Fva-structure-weak","The V–A Charged Weak Current","The Weak Interaction","Fermi modelled beta decay as a four-fermion contact interaction, but a coupling with dimensions of inverse mass squared makes cross sections grow without bound and the theory fails near 300 GeV. The cure is a heavy mediator: the $W$ boson, whose propagator collapses to Fermi's contact term at low energy and fixes $G_F\u002F\\sqrt2 = g^2\u002F8M_W^2$. Parity violation dictates the current's form — vector minus axial-vector, coupling only to left-chiral fields — and universality of the coupling ties muon decay, beta decay, and pion decay to one constant. Pion decay's helicity suppression of the electron channel is the sharpest test.\n",{"path":8919,"title":8920,"module":8916,"summary":8921},"\u002Fparticle-physics\u002Fweak-interaction\u002Fw-z-bosons-decays","The W and Z Bosons","The contact theory hides a massive mediator. The charged $W^\\pm$ carries the current that changes flavour; the neutral $Z^0$ carries a current that does not. Both were found at CERN's proton–antiproton collider in 1983 at the masses the electroweak theory demanded. Their decay widths partition into leptonic and hadronic channels, and the $Z$ carries a decisive extra: an invisible width from decays to neutrinos that counts the number of light generations at exactly three. Beta decay and muon decay are re-read at the parton level as $W$ exchange.\n",{"path":8923,"title":8924,"module":8916,"summary":8925},"\u002Fparticle-physics\u002Fweak-interaction\u002Fckm-matrix","Quark Mixing and the CKM Matrix","The quark eigenstates the weak force acts on are not the mass eigenstates. Cabibbo captured this with one rotation angle; the GIM mechanism added a fourth quark to cancel dangerous flavour-changing neutral currents and predicted charm before its discovery. Three generations promote the rotation to the unitary Cabibbo–Kobayashi–Maskawa matrix — three angles and one irreducible complex phase, the sole source of Standard-Model CP violation. The Wolfenstein parametrization exposes its steep hierarchy, and unitarity closes into a triangle whose area measures the phase.\n",{"path":8927,"title":8928,"module":8916,"summary":8929},"\u002Fparticle-physics\u002Fweak-interaction\u002Fcp-violation-kaons-b-mesons","CP Violation in Kaons and B Mesons","The neutral kaon is its own laboratory for CP. Weak box diagrams mix $K^0$ and its antiparticle into short- and long-lived states that should be pure CP eigenstates decaying to two and three pions. In 1964 Cronin and Fitch caught the long-lived kaon decaying to two pions — CP is violated, at the two-per-mille level of $\\epsilon$. Direct violation ($\\epsilon'$) followed, and the $B$ factories turned the CKM phase into a large, clean time-dependent asymmetry measuring $\\sin 2\\beta$. The effect is real but far too small to explain why the universe is made of matter.\n",{"path":8931,"title":8932,"module":8933,"summary":8934},"\u002Fparticle-physics\u002Fqcd\u002Fcolor-su3-gluons","Color SU(3), Gluons, and the QCD Lagrangian","Quantum Chromodynamics","Color is the exact gauged SU(3) charge of the strong force. Gauging it forces eight massless gluons in the adjoint representation and, because the gauge group is non-abelian, three- and four-gluon self-couplings absent from QED. This lesson builds the QCD Lagrangian from the covariant derivative and the non-abelian field strength, states the Feynman rules with their color factors, and computes the Casimir invariants that set the strength of quark-gluon and gluon-gluon coupling.\n",{"path":8936,"title":8937,"module":8933,"summary":8938},"\u002Fparticle-physics\u002Fqcd\u002Fasymptotic-freedom-confinement","Asymptotic Freedom and Confinement","The QCD beta function is negative: gluon self-interaction antiscreens color, so the coupling weakens at short distance (asymptotic freedom) and strengthens at long distance (confinement). This lesson computes the one-loop beta coefficient, solves for the running of alpha_s and the emergent scale Lambda_QCD, and reads the strong-coupling regime as the linear quark-antiquark potential of a color flux tube that breaks by pair creation.\n",{"path":8940,"title":8941,"module":8933,"summary":8942},"\u002Fparticle-physics\u002Fqcd\u002Fdeep-inelastic-scattering-partons","Deep Inelastic Scattering and the Parton Model","Scattering electrons hard off a proton resolves pointlike constituents. This lesson sets up the deep-inelastic kinematics, defines the structure functions F1 and F2, and reads Bjorken scaling as the signature of free spin-half partons. The Callan-Gross relation fixes the parton spin, the structure function becomes a charge-weighted sum of parton distributions, and the slow logarithmic scaling violations expose the gluon through DGLAP evolution.\n",{"path":8944,"title":8945,"module":8933,"summary":8946},"\u002Fparticle-physics\u002Fqcd\u002Fjets-hadronization","Jets, Hadronization, and Testing QCD","Quarks and gluons produced in a collision fragment into collimated sprays of hadrons — jets — whose directions track the underlying partons. This lesson reads two-jet events as the quark and antiquark of electron-positron annihilation, three-jet events as direct evidence of the radiated gluon, and the hadronization step as the flux tube breaking into color singlets. Jet algorithms and event-shape variables turn the pattern into precision measurements of alpha_s.\n",{"path":8948,"title":8949,"module":8950,"summary":8951},"\u002Fparticle-physics\u002Felectroweak-higgs\u002Felectroweak-su2-u1","The Electroweak Theory","Electroweak Unification and the Higgs","The electromagnetic and weak interactions are two faces of a single gauge theory built on $SU(2)_L \\times U(1)_Y$. Left-handed fermions sit in weak-isospin doublets and right-handed fermions in singlets, each carrying a hypercharge fixed by the Gell-Mann–Nishijima relation $Q = T_3 + Y\u002F2$. The four gauge fields $W^{1,2,3}$ and $B$ mix: the charged combinations $W^\\pm$ mediate the charged current, while $W^3$ and $B$ rotate through the Weinberg angle into the massless photon and the massive $Z$. The single angle $\\theta_W$ ties the couplings, the boson masses, and the neutral-current strengths together.\n",{"path":8953,"title":8954,"module":8950,"summary":8955},"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fspontaneous-symmetry-breaking","Spontaneous Symmetry Breaking","A symmetry of the Lagrangian need not be a symmetry of the ground state. When the lowest-energy configuration sits away from the symmetric point, the symmetry is spontaneously broken and the vacuum is one of a degenerate family. Breaking a continuous global symmetry produces one massless scalar — a Goldstone boson — for every broken generator, the flat direction along the vacuum manifold. The Mexican-hat potential and the ferromagnet below its Curie point are the working pictures.\n",{"path":8957,"title":8958,"module":8950,"summary":8959},"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fhiggs-mechanism","The Higgs Mechanism","Gauging a spontaneously broken symmetry converts the would-be Goldstone bosons into the longitudinal polarizations of the gauge fields, which thereby acquire mass. Applied to $SU(2)_L \\times U(1)_Y$ with a single Higgs doublet, three of the four scalar degrees of freedom are eaten by the $W^\\pm$ and $Z$; the fourth survives as the physical Higgs boson, and the photon stays massless. Fermion masses come from Yukawa couplings to the same field, each mass proportional to its coupling times the vacuum expectation value $v \\approx 246$ GeV.\n",{"path":8961,"title":8962,"module":8950,"summary":8963},"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fhiggs-boson-discovery","The Higgs Boson","The Higgs boson is produced at the LHC chiefly through gluon fusion, with vector-boson fusion and associated production as cleaner but rarer channels. It decays most often to $b\\bar b$ and $WW^\\ast$, but the discovery rested on two rare clean modes, $H \\to \\gamma\\gamma$ and $H \\to ZZ^\\ast \\to 4\\ell$, whose narrow invariant-mass peaks emerged over smooth backgrounds. ATLAS and CMS announced a boson near 125 GeV in 2012; its measured spin-parity $0^+$ and its couplings, which scale with particle mass, identify it as the Standard Model Higgs.\n",{"path":8965,"title":8966,"module":8950,"summary":8967},"\u002Fparticle-physics\u002Felectroweak-higgs\u002Fstandard-model","The Standard Model","The Standard Model combines the quark model, quantum chromodynamics, and the electroweak theory. SU(3) symmetry sorts the hadrons and predicted the omega; color explains why only colorless quark combinations exist; QCD gives asymptotic freedom and confinement; and spontaneous symmetry breaking through the Higgs field gives the weak bosons their mass.\n",{"path":8969,"title":8970,"module":8971,"summary":8972},"\u002Fparticle-physics\u002Fneutrinos\u002Fneutrino-oscillations","Neutrino Oscillations","Neutrino Physics","Neutrinos are produced and detected in flavour states, but they propagate as mass states, and the two bases are misaligned. A flavour therefore evolves coherently into a superposition of other flavours with a probability set by the mass-squared splitting and the ratio L\u002FE. This lesson derives the two-flavour oscillation formula, applies it to the solar and atmospheric neutrino deficits, shows how the SNO neutral-current measurement resolved the solar problem, and works out the MSW resonance that amplifies mixing inside the Sun.\n",{"path":8974,"title":8975,"module":8971,"summary":8976},"\u002Fparticle-physics\u002Fneutrinos\u002Fneutrino-mass-pmns","Neutrino Mass and the PMNS Matrix","Three-flavour mixing promotes the single oscillation angle to the unitary Pontecorvo–Maki–Nakagawa–Sakata matrix, parametrised by three angles and a Dirac CP phase. This lesson decomposes the PMNS matrix into three rotations, records the measured angles and mass-squared splittings, lays out the normal and inverted mass orderings, contrasts the large leptonic mixing with the near-diagonal CKM matrix, and collects the absolute-mass bounds from beta decay and cosmology.\n",{"path":8978,"title":8979,"module":8971,"summary":8980},"\u002Fparticle-physics\u002Fneutrinos\u002Fdirac-majorana-experiments","Dirac, Majorana, and Neutrino Experiments","A neutral fermion can carry a mass term forbidden to every charged particle, so the neutrino may be its own antiparticle. This lesson contrasts the Dirac and Majorana mass terms and their state content, derives the seesaw mechanism that ties a tiny light mass to a heavy right-handed partner, presents neutrinoless double-beta decay as the decisive lepton-number test, surveys the reactor, accelerator, solar, and atmospheric sources on a baseline–energy map, and explains why neutrino mass is physics beyond the original Standard Model.\n",{"path":8982,"title":8983,"module":8984,"summary":8985},"\u002Fparticle-physics\u002Fexperiment\u002Faccelerators-luminosity","Accelerators, Colliders, and Luminosity","Accelerators and Detectors","Fixed-target machines waste energy in the center-of-mass motion of the whole system, so the reachable $\\sqrt s$ grows only as the square root of the beam energy, while colliders put the full beam energy into the collision. Circular electron machines are limited by synchrotron radiation scaling as $E^4\u002Fm^4R$; proton machines are limited by bending fields. Luminosity, set by beam current and focusing, converts a cross section into an event rate through $R=\\mathcal L\\,\\sigma$, and integrated luminosity sets the total event count.\n",{"path":8987,"title":8988,"module":8984,"summary":8989},"\u002Fparticle-physics\u002Fexperiment\u002Fdetectors-subsystems","Particle Detectors and Subsystems","A detector reads a collision by the energy particles deposit as they cross matter. Charged particles ionize at the Bethe-Bloch rate, radiate in the field of nuclei above a critical energy, and emit Cherenkov light above a velocity threshold; electrons and photons build electromagnetic showers over a radiation length, and hadrons build wider showers over a nuclear interaction length. The onion of tracker, electromagnetic and hadronic calorimeters, and outer muon chambers turns these processes into momentum, energy, and identity, with neutrinos inferred from missing transverse momentum.\n",{"path":8991,"title":8992,"module":8984,"summary":8993},"\u002Fparticle-physics\u002Fexperiment\u002Fhow-discoveries-are-made","From Collisions to Discoveries","A discovery is a peak that survives statistics. Events are reconstructed into invariant masses, a signal accumulates as a bump over a smooth background, and its significance is judged by a p-value; the field's threshold is five sigma. The expected yield is a product — luminosity times cross section times branching ratio times acceptance and efficiency — that must be balanced by a trigger and data-reduction chain against an overwhelming rate. Worked reconstructions of $Z\\to\\ell\\ell$, the $J\u002F\\psi$, and the Higgs show the same peak-over-background logic at three scales.\n",{"path":8995,"title":8996,"module":8996,"summary":8997},"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fbeyond-standard-model","Beyond the Standard Model","The Standard Model leaves the four interactions ununified and the neutrinos massless, both now known to be wrong. Grand unification predicts the couplings merge near ten-to-the-sixteen GeV and the proton decays; supersymmetry pairs each particle with a superpartner; and the confirmed oscillation of neutrinos proves they carry mass, the first crack in the model.\n",{"path":8999,"title":9000,"module":8996,"summary":9001},"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fgrand-unified-theories","Grand Unified Theories and Proton Decay","The Standard Model gauge group is a product of three factors with three independent couplings. A grand unified theory embeds them in a single simple group — SU(5) is the minimal choice — so that one coupling runs into all three and the fractional quark charges follow from a tracelessness condition. The same embedding places quarks and leptons in shared multiplets, mediates baryon-number violation through superheavy gauge bosons, and predicts the proton decays with a lifetime that Super-Kamiokande has pushed past ten-to-the-thirty-four years.\n",{"path":9003,"title":9004,"module":8996,"summary":9005},"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fsupersymmetry","Supersymmetry","Supersymmetry relates fermions and bosons, pairing every Standard Model particle with a superpartner whose spin differs by one half. The pairing makes the scalar and fermion loop corrections to the Higgs mass cancel, removing the quadratic sensitivity to high scales; it sharpens the meeting of the three gauge couplings; and, when R-parity is conserved, it leaves the lightest superpartner stable and neutral, a natural dark-matter candidate. The LHC has excluded gluinos and light squarks below roughly two TeV.\n",{"path":9007,"title":9008,"module":8996,"summary":9009},"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fhierarchy-problem-naturalness","The Hierarchy Problem and Naturalness","The electroweak scale sits sixteen orders of magnitude below the Planck scale, and nothing in the Standard Model protects that gap. The Higgs mass squared picks up quadratic corrections proportional to the highest scale in the theory, so keeping it at the observed value requires the bare mass and its counterterm to cancel to some thirty significant figures. Naturalness treats that cancellation as a symptom of missing physics. Supersymmetry, compositeness, and extra dimensions each remove the quadratic sensitivity, but the LHC has found none of them at the predicted scale.\n",{"path":9011,"title":9012,"module":8996,"summary":9013},"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fdark-matter-candidates","Dark Matter and Particle Candidates","Flat galactic rotation curves, gravitational lensing, the cosmic microwave background, and structure formation all require about five times more matter than the visible baryons, none of it interacting electromagnetically. A stable weakly interacting particle of roughly weak-scale mass freezes out of the early universe with close to the observed abundance — the WIMP miracle — and is the leading candidate, with axions and sterile neutrinos as alternatives. Direct, indirect, and collider searches have so far only tightened the limits.\n",{"path":9015,"title":9016,"module":8996,"summary":9017},"\u002Fparticle-physics\u002Fbeyond-standard-model\u002Fmatter-antimatter-open-questions","Matter-Antimatter Asymmetry and Open Questions","The universe is made of matter, with about one extra baryon for every billion photons and no antimatter regions. Sakharov identified the three conditions any dynamical explanation must meet: baryon-number violation, C and CP violation, and a departure from thermal equilibrium. The Standard Model contains all three in principle, but its CP violation falls short by some ten orders of magnitude, so baryogenesis requires new physics — leptogenesis being the leading route. A closing survey collects the open questions and the experiments aimed at them.\n",{"path":9019,"title":9020,"module":6,"summary":6},"\u002Fparticle-physics","Particle Physics",{"path":9022,"title":9023,"module":9024,"summary":9025},"\u002Fastrophysics-cosmology\u002Forientation\u002Fthe-sun-and-stars","The Sun and the Life of Stars","Orientation","The Sun is the one star close enough to study in detail: its luminosity fixes a surface temperature of 5780 K, and the proton-proton fusion cycle in its 1.5-million-kelvin core supplies its power. Measuring other stars needs the magnitude scale, parallax, and the distance ladder; plotting luminosity against temperature builds the Hertzsprung-Russell diagram, on which a star's mass sets its lifetime and its evolutionary track off the main sequence.\n",{"path":9027,"title":9028,"module":9024,"summary":9029},"\u002Fastrophysics-cosmology\u002Forientation\u002Fstellar-death-final-states","Cataclysmic Events and the Final States of Stars","A star's death is set by its mass. In close binaries, matter poured across the Roche lobe onto a white dwarf produces novae and, at the Chandrasekhar limit of 1.4 solar masses, a Type Ia supernova; a massive star fusing to an iron core collapses into a Type II supernova. The remnant is a white dwarf held by electron degeneracy, a neutron star held by neutron degeneracy, or, above the neutron-star limit, a black hole inside its Schwarzschild radius.\n",{"path":9031,"title":9032,"module":9024,"summary":9033},"\u002Fastrophysics-cosmology\u002Forientation\u002Fgalaxies-and-cosmology","Galaxies, Cosmology, and the Evolving Universe","Galaxies come in elliptical, spiral, and irregular forms, and their redshifts obey Hubble's law, evidence that space itself is expanding. The critical density and the density parameter decide whether the universe is open, flat, or closed; baryons, dark matter, and dark energy each contribute. The cosmic microwave background and primordial helium anchor the Big Bang, whose thermal history runs from inflation through nucleosynthesis to the atoms of today.\n",{"path":9035,"title":9036,"module":9037,"summary":9038},"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Fmagnitudes-fluxes-and-the-distance-modulus","Magnitudes, Fluxes, and the Distance Modulus","Observational Foundations","The brightness of a star reaches us as a radiant flux that falls off as the inverse square of distance. The magnitude scale encodes flux logarithmically through the Pogson ratio; the apparent and absolute magnitudes differ by the distance modulus, which converts a measured brightness into a distance. The bolometric correction folds a filtered magnitude into a total luminosity, and the difference of two magnitudes in different bands, the color index, measures surface temperature.\n",{"path":9040,"title":9041,"module":9037,"summary":9042},"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Fstellar-spectra-and-spectral-classification","Stellar Spectra and Spectral Classification","A stellar spectrum is a continuum crossed by absorption lines whose strengths are set by the temperature of the atmosphere. The Boltzmann factor governs how atoms populate excited states, and the Saha equation governs how they ionize; their product explains why each line, such as the hydrogen Balmer series, peaks in strength at a characteristic temperature. This behavior orders stars into the OBAFGKM sequence, and the luminosity classes of the MK system add a second dimension for surface gravity.\n",{"path":9044,"title":9045,"module":9037,"summary":9046},"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Ftelescopes-and-detectors-across-the-spectrum","Telescopes and Detectors Across the Spectrum","A telescope collects light in proportion to its collecting area and resolves detail down to the diffraction limit set by its aperture and the observing wavelength. The atmosphere blurs and blocks large parts of the spectrum, which drives the choice between ground and space and between refractors, reflectors, and radio dishes. CCDs record the light with high quantum efficiency, and interferometry synthesizes an aperture as large as the separation of two telescopes.\n",{"path":9048,"title":9049,"module":9037,"summary":9050},"\u002Fastrophysics-cosmology\u002Fobservational-foundations\u002Fthe-cosmic-distance-ladder","The Cosmic Distance Ladder","No single method measures distances from the nearest stars to the far reaches of the universe. Instead a ladder of overlapping techniques, each calibrated by the one below it, extends the scale rung by rung: trigonometric parallax, main-sequence fitting, pulsating variables, the tip of the red-giant branch, the Tully-Fisher relation, and Type Ia supernovae. Each rung inherits the uncertainty of every rung beneath it, so the whole chain sets the accuracy of the Hubble constant.\n",{"path":9052,"title":9053,"module":9054,"summary":9055},"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fblackbody-radiation-and-specific-intensity","Blackbody Radiation and Specific Intensity","Radiation and Matter","Specific intensity is the fundamental measure of a radiation field: energy per unit area, time, frequency, and solid angle. It is conserved along a ray in empty space, and its angular moments give the mean intensity, flux, and radiation pressure. In thermal equilibrium the intensity equals the Planck function, whose limits and integrals reproduce the Rayleigh-Jeans law, the Wien law, Stefan-Boltzmann, and Wien's displacement law.\n",{"path":9057,"title":9058,"module":9054,"summary":9059},"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fradiative-transfer-and-the-transfer-equation","Radiative Transfer and the Transfer Equation","Along a ray, matter adds intensity through emission and removes it through absorption. Measuring path length in optical depth turns this into the transfer equation, whose formal solution superposes an attenuated background on the source function integrated along the line of sight. In local thermodynamic equilibrium the source function is the Planck function, and the Eddington-Barbier relation shows that the emergent intensity samples the source function at optical depth of order unity, explaining absorption lines and solar limb darkening.\n",{"path":9061,"title":9062,"module":9054,"summary":9063},"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fspectral-line-formation-and-broadening","Spectral-Line Formation and Broadening","A spectral line is a bound-bound transition whose strength is set by an oscillator strength and whose shape is set by three broadening mechanisms: the Lorentzian natural and collisional wings, the Gaussian thermal Doppler core, and their Voigt convolution. Equivalent width measures the total absorption, and the curve of growth relates it to the number of absorbers through a linear, saturated, and damping regime, turning line strengths into abundances.\n",{"path":9065,"title":9066,"module":9054,"summary":9067},"\u002Fastrophysics-cosmology\u002Fradiation-and-matter\u002Fopacity-and-the-rosseland-mean","Opacity Sources and the Rosseland Mean","Stellar opacity comes from four processes: bound-bound line absorption, bound-free photoionization, free-free absorption, and electron scattering. The bound-free and free-free terms follow a Kramers law, electron scattering sets a frequency-flat floor, and the negative hydrogen ion dominates cool photospheres. The Rosseland mean averages these harmonically, weighting transparent frequencies because they carry the flux, and its value fixes the radiative temperature gradient and decides where a star becomes convective.\n",{"path":9069,"title":9070,"module":9071,"summary":9072},"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fhydrostatic-equilibrium-and-the-virial-theorem","Hydrostatic Equilibrium and the Virial Theorem","Stellar Structure","A star holds itself up by balancing the inward pull of gravity against an outward pressure gradient. This balance, hydrostatic equilibrium, fixes a lower bound on the central pressure and, combined with the gravitational potential energy, yields the virial theorem. The virial relation gives a star a negative heat capacity, so that losing energy makes it hotter, and sets the Kelvin-Helmholtz timescale over which contraction alone can power the Sun.\n",{"path":9074,"title":9075,"module":9071,"summary":9076},"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fthe-equations-of-stellar-structure","The Equations of Stellar Structure","A static star is described by four coupled first-order differential equations in the interior mass or radius: mass conservation, hydrostatic equilibrium, energy generation, and energy transport. Closed with an equation of state, opacity, and reaction rates, and subject to central and surface boundary conditions, they determine the structure uniquely from mass and composition, the Vogt-Russell theorem. Energy moves by radiation until the temperature gradient exceeds the Schwarzschild limit, where convection takes over.\n",{"path":9078,"title":9079,"module":9071,"summary":9080},"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fthe-equation-of-state-and-polytropes","The Equation of State and Polytropes","Stellar pressure comes from gas, radiation, and, at high density, degenerate electrons. When pressure depends on density as a power law, hydrostatic equilibrium reduces to the Lane-Emden equation, whose solutions describe polytropes of index n. The relativistic degenerate case, n equal to three, gives a mass independent of radius, the Chandrasekhar mass. Eddington's standard model treats a radiation-supported star as an n equal to three polytrope and yields the quartic relating radiation fraction to mass.\n",{"path":9082,"title":9083,"module":9071,"summary":9084},"\u002Fastrophysics-cosmology\u002Fstellar-structure\u002Fthe-standard-solar-model","The Standard Solar Model","The standard solar model integrates the structure equations for one solar mass and calibrates the composition and convection parameter to reproduce the Sun's observed luminosity, radius, and age. Helioseismology tests the model's sound speed through the Sun's acoustic p-mode oscillations, and the model predicts a neutrino flux by production channel. The measured deficit, the solar-neutrino problem, is resolved by matter-enhanced flavor oscillation, confirmed when SNO measured the total flux across all flavors.\n",{"path":9086,"title":9087,"module":9088,"summary":9089},"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fthermonuclear-reaction-rates-and-the-gamow-peak","Thermonuclear Reaction Rates and the Gamow Peak","Nuclear Astrophysics","Stellar fusion proceeds only by quantum tunneling through the Coulomb barrier, because thermal energies are a thousand times smaller than the barrier height. The reaction rate is an integral over the Maxwell–Boltzmann distribution and the tunneling probability, whose product is sharply peaked at the Gamow energy. The astrophysical S-factor isolates the nuclear physics from the barrier penetration, and the steep temperature dependence follows from the width and position of the Gamow peak.\n",{"path":9091,"title":9092,"module":9088,"summary":9093},"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fhydrogen-burning-pp-chains-and-cno","Hydrogen Burning: pp Chains and the CNO Cycle","Four protons fuse into one helium-4 nucleus, releasing 26.7 MeV, through two competing networks. The pp chain begins with a weak-interaction bottleneck and branches three ways; the CNO cycle uses carbon, nitrogen, and oxygen as catalysts and is limited by nitrogen-14 proton capture. Their steep and gentle temperature dependences cross near 1.8e7 K, which divides pp-powered lower-main-sequence stars from CNO-powered upper-main-sequence stars.\n",{"path":9095,"title":9096,"module":9088,"summary":9097},"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fhelium-burning-and-the-triple-alpha-process","Helium Burning and the Triple-Alpha Process","Helium fuses to carbon in two steps through the unbound beryllium-8 nucleus and a resonant excited state of carbon-12, the Hoyle state, whose existence was predicted from the observed carbon abundance. The rate scales as roughly the fortieth power of temperature, and in a degenerate low-mass core this drives the runaway helium flash. A competing alpha capture on carbon-12 sets the carbon-to-oxygen ratio and the composition of the resulting white dwarf.\n",{"path":9099,"title":9100,"module":9088,"summary":9101},"\u002Fastrophysics-cosmology\u002Fnuclear-astrophysics\u002Fadvanced-burning-and-neutron-capture-nucleosynthesis","Advanced Burning, the Iron Peak, and the s\u002Fr Processes","Massive stars burn carbon, neon, oxygen, and silicon in ever-shorter stages, building an onion-shell interior and reaching nuclear statistical equilibrium at the iron peak, where the binding-energy-per-nucleon curve turns over and fusion can release no more energy. Elements beyond iron form by neutron capture: the slow s-process in AGB stars tracks the valley of stability, while the rapid r-process in supernovae and neutron-star mergers builds the heaviest nuclei far from it.\n",{"path":9103,"title":9104,"module":9105,"summary":9106},"\u002Fastrophysics-cosmology\u002Fism-and-star-formation\u002Fphases-of-the-interstellar-medium","The Phases of the Interstellar Medium","The Interstellar Medium","The gas between the stars separates into distinct thermal phases, from cold molecular clouds at 10 K to a diffuse million-degree corona, held near a common pressure by a balance of photoelectric heating and radiative cooling. Neutral hydrogen is traced by the 21-cm hyperfine line, dust reddens and extinguishes starlight along a characteristic wavelength law, and the ultraviolet output of hot stars carves ionized Strömgren spheres out of the surrounding gas.\n",{"path":9108,"title":9109,"module":9105,"summary":9110},"\u002Fastrophysics-cosmology\u002Fism-and-star-formation\u002Fmolecular-clouds-and-gravitational-collapse","Molecular Clouds and Gravitational Collapse","Stars form in cold, dense molecular clouds when self-gravity overcomes thermal and magnetic support. The virial theorem fixes the Jeans mass and length at which a clump becomes unstable, the free-fall time sets how fast it collapses, and a fragmentation cascade — cut off at a minimum mass by the onset of opacity — turns one cloud into a whole cluster, imprinting the stellar initial mass function.\n",{"path":9112,"title":9113,"module":9105,"summary":9114},"\u002Fastrophysics-cosmology\u002Fism-and-star-formation\u002Fprotostars-and-the-pre-main-sequence","Protostars and Pre-Main-Sequence Evolution","A collapsing core becomes optically thick and forms a protostar that grows by accretion through a disk while driving bipolar outflows. The newborn star appears on the birthline and contracts down the fully convective Hayashi track, then crosses the radiative Henyey track to the zero-age main sequence, powered by gravitational contraction until hydrogen ignites. Below about 0.08 solar masses degeneracy halts contraction before ignition, dividing stars from brown dwarfs.\n",{"path":9116,"title":9117,"module":9118,"summary":9119},"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fthe-main-sequence-and-its-structure","The Main Sequence and Its Structure","Stellar Evolution","A star settles onto the zero-age main sequence when core hydrogen ignition halts contraction. Homology scaling of the structure equations reproduces the mass–luminosity relation, and the burning mode splits the sequence into an upper branch with a convective core and a lower branch with a convective envelope. The main-sequence lifetime falls steeply with mass, and the turnoff of a coeval cluster serves as a clock.\n",{"path":9121,"title":9122,"module":9118,"summary":9123},"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fpost-main-sequence-low-mass-evolution","Post-Main-Sequence Evolution of Low-Mass Stars","When a low-mass star exhausts core hydrogen, burning moves to a shell, the core contracts, and the envelope swells into a red giant. A degenerate helium core ignites in a flash, settles onto the horizontal branch, and after a second contraction the star climbs the asymptotic giant branch with two burning shells. Thermal pulses and dredge-up enrich the surface, and mass loss ejects a planetary nebula, leaving a carbon–oxygen white dwarf.\n",{"path":9125,"title":9126,"module":9118,"summary":9127},"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fthe-evolution-of-massive-stars","The Evolution of Massive Stars","Stars above about eight solar masses burn through hydrogen, helium, carbon, neon, oxygen, and silicon in stages that grow shorter as neutrino losses accelerate contraction. The interior becomes an onion of concentric burning shells around an inert iron core. Radiation pressure near the Eddington limit drives fierce winds that can strip the hydrogen envelope entirely, and silicon burning builds an iron core toward the threshold of collapse.\n",{"path":9129,"title":9130,"module":9118,"summary":9131},"\u002Fastrophysics-cosmology\u002Fstellar-evolution\u002Fstellar-pulsation-and-the-instability-strip","Stellar Pulsation and the Instability Strip","Radial pulsation is a standing sound wave whose period scales inversely with the square root of the mean density. The kappa mechanism, an opacity valve seated in the helium partial-ionization zone, turns a star into a heat engine that pumps the oscillation. Stars in the instability strip pulsate as Cepheids, RR Lyrae, and Mira variables, and the Cepheid period–luminosity relation calibrates the distance ladder.\n",{"path":9133,"title":7553,"module":9134,"summary":9135},"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fwhite-dwarfs-and-the-chandrasekhar-limit","Stellar Death and Compact Remnants","A white dwarf is held up by the degeneracy pressure of its electrons, a quantum-mechanical stiffness that survives to zero temperature. Filling the Fermi sea sets a pressure that scales as density to the five-thirds power when the electrons are slow and only four-thirds when they are relativistic. The softer relativistic law produces the inverted mass-radius relation and a maximum mass, the Chandrasekhar limit near 1.4 solar masses, above which no cold equilibrium exists. Cooling and crystallization then turn the white-dwarf population into a clock for the Galactic disk.\n",{"path":9137,"title":9138,"module":9134,"summary":9139},"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fcore-collapse-supernovae","Core-Collapse Supernovae","When a massive star builds an iron core past the Chandrasekhar mass, degeneracy fails and the core collapses in less than a second. Photodisintegration and electron capture remove pressure support and neutronize the matter; the collapse halts abruptly at nuclear density, launching a shock that stalls and is revived by neutrino heating. The event is a Type II or stripped-envelope Ib\u002FIc supernova, and the neutrinos from SN 1987A confirmed the picture directly.\n",{"path":9141,"title":9142,"module":9134,"summary":9143},"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fthermonuclear-supernovae-type-ia","Thermonuclear Supernovae","A carbon-oxygen white dwarf driven toward the Chandrasekhar mass ignites its degenerate fuel and unbinds itself in a thermonuclear runaway, the Type Ia supernova. The light curve is powered by the radioactive decay of nickel-56 to cobalt-56 to iron-56, and the Phillips relation between peak brightness and decline rate makes these events standardizable candles. Their near-uniform luminosity turns them into the distance indicators that revealed cosmic acceleration.\n",{"path":9145,"title":9146,"module":9134,"summary":9147},"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fneutron-stars-and-pulsars","Neutron Stars and Pulsars","A neutron star is held up by neutron degeneracy and the repulsive nuclear force, with a maximum mass, the Tolman-Oppenheimer-Volkoff limit, set by an uncertain dense-matter equation of state. Its rotating magnetic dipole sweeps a beam past Earth as a pulsar, and magnetic braking traces a track across the period-period- derivative diagram. Millisecond pulsars, magnetars, glitches, and the orbital decay of the Hulse-Taylor binary follow from the same structure.\n",{"path":9149,"title":9150,"module":9134,"summary":9151},"\u002Fastrophysics-cosmology\u002Fstellar-death-and-compact-remnants\u002Fblack-holes-schwarzschild-and-kerr","Black Holes, Schwarzschild and Kerr","Above the neutron-star mass limit gravity wins completely and the remnant is a black hole. The Schwarzschild solution gives the event horizon, gravitational redshift, and time dilation; the innermost stable circular orbit sets the efficiency of accretion. Rotating Kerr black holes drag spacetime and carry an ergosphere. Stellar-mass black holes are found in X-ray binaries, and the Event Horizon Telescope has imaged the shadow of a supermassive one.\n",{"path":9153,"title":9154,"module":9155,"summary":9156},"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Fbinary-systems-and-mass-transfer","Binary Systems and Mass Transfer","Binaries and Gravitational Waves","Most stars are born in pairs, and a binary is the only setting where a stellar mass can be measured directly. Visual, spectroscopic, and eclipsing binaries each expose a different combination of the orbital elements, and together they calibrate the mass-luminosity relation. When one star swells to fill its Roche lobe, gas streams through the inner Lagrange point onto its companion. Conservative transfer widens or shrinks the orbit depending on the mass ratio, and the sign of that response explains the Algol paradox.\n",{"path":9158,"title":9159,"module":9155,"summary":9160},"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Faccreting-compact-objects","Accreting Compact Objects","Gas falling onto a compact object converts gravitational binding energy into radiation with an efficiency set by the depth of the potential well, up to tens of percent of the rest mass for a neutron star or black hole. Angular momentum forces the flow into a disk, and viscous dissipation gives a temperature profile that falls as radius to the minus three-quarters, producing a multicolor blackbody spectrum. Radiation pressure caps the steady luminosity at the Eddington limit. Unstable nuclear burning of the accreted fuel powers classical novae on white dwarfs and Type I X-ray bursts on neutron stars.\n",{"path":9162,"title":9163,"module":9155,"summary":9164},"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Fgravitational-waves-from-inspiraling-binaries","Gravitational Waves from Inspiraling Binaries","A time-varying mass quadrupole radiates gravitational waves, ripples in spacetime that stretch and squeeze a ring of free masses along two polarizations. The radiated power drains a binary's orbital energy, shrinking the orbit and sweeping the wave frequency upward in a chirp whose rate fixes the chirp mass. Laser interferometers with kilometre arms measure the resulting strain of order ten to the minus twenty-one. The first detection, GW150914, matched a template for two merging black holes near thirty solar masses each.\n",{"path":9166,"title":9167,"module":9155,"summary":9168},"\u002Fastrophysics-cosmology\u002Fbinaries-and-gravitational-waves\u002Fmultimessenger-astronomy-and-gamma-ray-bursts","Multimessenger Astronomy and Gamma-Ray Bursts","Gamma-ray bursts split into two populations: long bursts from the collapse of massive stars and short bursts from merging compact objects. The compactness problem forces the emitting plasma to move at ultra-relativistic speed, beaming the radiation into a narrow jet. The neutron-star merger GW170817 tied a gravitational chirp to a short gamma-ray burst, a radioactive kilonova, and a broadband afterglow, confirming that mergers forge r-process elements. A merger with a measured redshift is a standard siren that reads the Hubble constant from gravitational data alone.\n",{"path":9170,"title":9171,"module":9172,"summary":9173},"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fthe-milky-way","The Milky Way Galaxy","Galaxies and Dark Matter","The Galaxy resolves into a thin disk of gas and young stars, a central bar and bulge, and a diffuse old halo studded with globular clusters. Star counts and the reddening of distant light map these components, while the differential rotation of the disk — encoded in the Oort constants and the flat rotation curve — measures the enclosed mass and reveals more than the stars can account for. Spiral arms are density waves, not material structures, and the innermost stellar orbits around Sgr A* weigh a four-million-solar-mass black hole.\n",{"path":9175,"title":9176,"module":9172,"summary":9177},"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fgalaxy-morphology-and-classification","Galaxy Morphology and Classification","Galaxies sort along the Hubble tuning fork from smooth ellipticals through lenticulars to grand-design and barred spirals, with irregulars off the end. The light of a spheroid follows the de Vaucouleurs quarter-power law while a disk fades exponentially, and the general Sérsic profile interpolates between them. Virial scaling relations — Tully–Fisher for disks, Faber–Jackson and the fundamental plane for spheroids — tie luminosity to internal motions, and the Schechter function fixes the abundance of galaxies as a function of luminosity.\n",{"path":9179,"title":9180,"module":9172,"summary":9181},"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fgalaxy-rotation-curves-and-dark-matter","Galaxy Rotation Curves and Dark Matter","The rotation curves of disk galaxies stay flat far beyond the light, demanding an extended halo whose density falls as the inverse square of radius. Decomposing the curve into disk, bulge, and halo, and fitting isothermal or NFW profiles, quantifies the missing mass. Gravitational lensing weighs the same mass without dynamics, the mass-to-light ratio climbs from stars to clusters, and the Bullet Cluster separates the collisionless dark matter from the colliding gas — evidence that MOND strains to match.\n",{"path":9183,"title":9184,"module":9172,"summary":9185},"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Factive-galactic-nuclei-and-supermassive-black-holes","Active Galactic Nuclei","A small fraction of galaxies pour out enormous luminosity from a region smaller than the solar system. Accretion onto a supermassive black hole, limited by the Eddington balance of radiation pressure and gravity, powers the Seyferts, quasars, radio galaxies, and blazars — one engine seen from different angles through an obscuring torus. Relativistic jets produce apparent superluminal motion, reverberation mapping and stellar dynamics weigh the central mass, and the M–sigma relation ties that mass to the host bulge.\n",{"path":9187,"title":9188,"module":9172,"summary":9189},"\u002Fastrophysics-cosmology\u002Fgalaxies\u002Fgalaxy-clusters-and-large-scale-structure","Galaxy Clusters and Large-Scale Structure","Galaxies gather into groups and rich clusters bound by a common dark halo and filled with hot X-ray gas. Three independent probes — the virial theorem, the hydrostatic X-ray temperature, and gravitational lensing — agree on a mass that dwarfs the stars. On the largest scales galaxies trace a cosmic web of filaments, walls, and voids, quantified by the two-point correlation function, whose baryon acoustic oscillation bump provides a standard ruler for cosmology.\n",{"path":9191,"title":9192,"module":9193,"summary":9194},"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fthe-expanding-universe-and-hubbles-law","The Expanding Universe and Hubble's Law","Cosmic Expansion and Dynamics","The universe is homogeneous and isotropic on large scales, so its expansion is captured by a single function of time, the scale factor. Comoving coordinates stay fixed while proper distances grow in proportion to the scale factor, producing Hubble's law and a cosmological redshift that measures stretched space rather than a Doppler shift. A Newtonian energy argument reproduces the dynamics, and the same finite, expanding cosmos resolves Olbers' paradox.\n",{"path":9196,"title":9197,"module":9193,"summary":9198},"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fthe-frw-metric-and-cosmological-redshift","The FRW Metric and Cosmological Redshift","The geometry of a homogeneous, isotropic universe is fixed by symmetry to the Robertson-Walker metric, with the entire freedom reduced to a scale factor and a single curvature constant selecting an open, flat, or closed space. From the metric the null geodesic of light gives comoving distance, the exact cosmological redshift, and the distinction between the proper distance we cannot measure and the redshift we can.\n",{"path":9200,"title":6271,"module":9193,"summary":9201},"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fthe-friedmann-equations-and-cosmic-dynamics","The scale factor obeys the Friedmann equation, the acceleration equation, and the fluid equation, only two of which are independent. An equation of state fixes how each component behaves under expansion, so radiation dilutes as the inverse fourth power of the scale factor, matter as the inverse cube, and vacuum energy not at all. The critical density defines the density parameters, and the deceleration parameter encodes whether gravity or dark energy is winning.\n",{"path":9203,"title":9204,"module":9193,"summary":9205},"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fcosmological-models-and-distances","Cosmological Models and Distances","Integrating the Friedmann equation for particular mixtures gives the benchmark models, from the matter-only Einstein-de Sitter universe to the concordance Lambda-CDM, each with its own scale-factor history and age. Because the redshift is the only direct observable, several distance measures diverge at high redshift, and the angular-diameter distance even turns over so that the most distant objects look larger. The horizon and lookback time set what is causally and observationally reachable.\n",{"path":9207,"title":9208,"module":9193,"summary":9209},"\u002Fastrophysics-cosmology\u002Fcosmology-expansion-and-dynamics\u002Fdark-energy-and-the-accelerating-universe","Dark Energy and the Accelerating Universe","In 1998 two teams found that distant Type Ia supernovae are fainter than a decelerating universe predicts, revealing that the expansion is accelerating and that a component with negative pressure dominates the energy budget. The simplest candidate is the cosmological constant, or vacuum energy, with an equation of state near minus one. It works observationally but leaves two deep puzzles: why the vacuum energy is a hundred and twenty orders of magnitude smaller than expected, and why it is comparable to the matter density just now.\n",{"path":9211,"title":9212,"module":9213,"summary":9214},"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fthe-thermal-history-of-the-universe","The Thermal History of the Universe","The Hot Big Bang","Running the expansion backward compresses and heats the universe, so its past is a sequence of thermal epochs set by temperature. Temperature scales as the inverse scale factor; species stay in equilibrium while their interaction rate exceeds the expansion rate and freeze out when it drops below. The effective degrees of freedom count the relativistic species and step down through mass thresholds, and neutrino decoupling just before electron-positron annihilation leaves a relic neutrino background slightly cooler than the photons.\n",{"path":9216,"title":9217,"module":9213,"summary":9218},"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fbig-bang-nucleosynthesis","Big Bang Nucleosynthesis","In the first three minutes the weak interactions freeze out the neutron-to-proton ratio, and once deuterium survives photodissociation a fast reaction network converts nearly all free neutrons into helium-4. The primordial abundances of deuterium, helium-3, helium-4, and lithium-7 depend on a single free parameter, the baryon-to-photon ratio, so measuring them fixes the baryon density. The predictions match observation across nine decades of abundance, with a persistent discrepancy in lithium-7.\n",{"path":9220,"title":9221,"module":9213,"summary":9222},"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Frecombination-and-the-cosmic-microwave-background","Recombination and the Cosmic Microwave Background","As the universe cooled through a few thousand kelvin the free electrons bound to protons, and the Saha equation tracks the falling ionization fraction. Once the plasma neutralized, photons stopped scattering and streamed freely from a spherical surface of last scattering at redshift about 1100. Those photons are the cosmic microwave background, an almost perfect blackbody at 2.725 kelvin with a dipole from our motion through it.\n",{"path":9224,"title":9225,"module":9213,"summary":9226},"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fcmb-anisotropies-and-cosmological-parameters","CMB Anisotropies and Cosmological Parameters","The cosmic microwave background carries temperature fluctuations at the ten-parts-per-million level, imprinted by sound waves in the photon-baryon plasma before recombination. Decomposed into spherical harmonics, the fluctuations form an angular power spectrum whose acoustic peaks encode the geometry and contents of the universe: the first peak fixes spatial flatness, the odd-even peak ratio the baryon density, and the third peak the dark-matter density. Polarization adds an independent channel, and the Planck measurements pin the concordance parameters.\n",{"path":9228,"title":9229,"module":9213,"summary":9230},"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fcosmic-inflation","Cosmic Inflation","The hot Big Bang leaves three initial-condition puzzles unexplained: why causally disconnected patches share a temperature, why the geometry is so nearly flat, and why no magnetic monopoles are seen. A brief epoch of accelerated expansion driven by a slowly rolling scalar field solves all three by stretching a small causal patch across the observable universe. The same accelerated expansion freezes quantum fluctuations into a near-scale-invariant spectrum of density perturbations, seeding all later structure.\n",{"path":9232,"title":9233,"module":9213,"summary":9234},"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fstructure-formation-and-the-growth-of-perturbations","Structure Formation and the Growth of Perturbations","The near-uniform early universe grew its galaxies and clusters by gravitational instability acting on the tiny inflationary perturbations. In an expanding background the growth is slowed to a power law rather than the exponential of a static medium; perturbations stall during radiation domination and grow with the scale factor once matter dominates. The transfer function turns the primordial spectrum into the processed matter power spectrum, and cold dark matter builds structure from the bottom up.\n",{"path":9236,"title":9237,"module":9213,"summary":9238},"\u002Fastrophysics-cosmology\u002Fthe-hot-big-bang\u002Fdark-matter-dark-energy-and-open-questions","Dark Matter, Dark Energy, and Open Questions","Five independent lines of evidence converge on a universe whose energy budget is dominated by dark energy and dark matter, with ordinary baryons a small remainder. The candidate particles for dark matter range from WIMPs to axions to sterile neutrinos, each with its own detection strategy. The concordance model fits the data with six parameters but leaves the nature of dark energy, the Hubble tension, small-scale structure, and the matter-antimatter asymmetry unexplained.\n",{"path":9240,"title":9241,"module":6,"summary":6},"\u002Fastrophysics-cosmology","Astrophysics & Cosmology",{"path":9243,"title":9244,"module":6,"summary":6},"\u002Fcolophon","Colophon",{"path":3377,"title":9246,"module":6,"summary":6},"Study Notes",[9248,9261,9273,9282,9291,9306,9361,9380],{"module":3628,"moduleNumber":2642,"slug":9249,"lessons":9250},"foundations",[9251,9253,9255,9257,9259],{"title":8609,"path":8608,"lessonNumber":2642,"topics":9252,"summary":8610},[3628],{"title":5,"path":3630,"lessonNumber":2648,"topics":9254,"summary":3646},[3628],{"title":8614,"path":8613,"lessonNumber":2654,"topics":9256,"summary":8615},[3628],{"title":8618,"path":8617,"lessonNumber":2660,"topics":9258,"summary":8619},[3628],{"title":8622,"path":8621,"lessonNumber":2666,"topics":9260,"summary":8623},[3628],{"module":8627,"moduleNumber":2648,"slug":9262,"lessons":9263},"classification",[9264,9267,9269,9271],{"title":8626,"path":8625,"lessonNumber":2642,"topics":9265,"summary":8628},[9266],"Classification",{"title":8631,"path":8630,"lessonNumber":2648,"topics":9268,"summary":8632},[9266],{"title":8635,"path":8634,"lessonNumber":2654,"topics":9270,"summary":8636},[9266],{"title":8638,"path":3412,"lessonNumber":2660,"topics":9272,"summary":8639},[9266],{"module":8643,"moduleNumber":2654,"slug":9274,"lessons":9275},"semantics",[9276,9278,9280],{"title":8642,"path":8641,"lessonNumber":2642,"topics":9277,"summary":8644},[8643],{"title":8647,"path":8646,"lessonNumber":2648,"topics":9279,"summary":8648},[8643],{"title":8651,"path":8650,"lessonNumber":2654,"topics":9281,"summary":8652},[8643],{"module":5030,"moduleNumber":2660,"slug":9283,"lessons":9284},"sequences",[9285,9287,9289],{"title":8655,"path":8654,"lessonNumber":2642,"topics":9286,"summary":8656},[5030],{"title":8659,"path":8658,"lessonNumber":2648,"topics":9288,"summary":8660},[5030],{"title":8663,"path":8662,"lessonNumber":2654,"topics":9290,"summary":8664},[5030],{"module":5512,"moduleNumber":2666,"slug":9292,"lessons":9293},"transformers",[9294,9296,9298,9300,9302,9304],{"title":8667,"path":8666,"lessonNumber":2642,"topics":9295,"summary":8668},[5512],{"title":7224,"path":8670,"lessonNumber":2648,"topics":9297,"summary":8671},[5512],{"title":7332,"path":8673,"lessonNumber":2654,"topics":9299,"summary":8674},[5512],{"title":8677,"path":8676,"lessonNumber":2660,"topics":9301,"summary":8678},[5512],{"title":8681,"path":8680,"lessonNumber":2666,"topics":9303,"summary":8682},[5512],{"title":8685,"path":8684,"lessonNumber":2672,"topics":9305,"summary":8686},[5512],{"module":8690,"moduleNumber":2672,"slug":9307,"lessons":9308},"linguistic-structure",[9309,9312,9314,9316,9318,9320,9322,9324,9326,9328,9331,9334,9337,9340,9343,9346,9349,9352,9355,9358],{"title":8689,"path":8688,"lessonNumber":2642,"topics":9310,"summary":8691},[9311],"Structure",{"title":8694,"path":8693,"lessonNumber":2648,"topics":9313,"summary":8695},[9311],{"title":8698,"path":8697,"lessonNumber":2654,"topics":9315,"summary":8699},[9311],{"title":8702,"path":8701,"lessonNumber":2660,"topics":9317,"summary":8703},[9311],{"title":8706,"path":8705,"lessonNumber":2666,"topics":9319,"summary":8707},[9311],{"title":8710,"path":8709,"lessonNumber":2672,"topics":9321,"summary":8711},[9311],{"title":8714,"path":8713,"lessonNumber":2678,"topics":9323,"summary":8715},[9311],{"title":8718,"path":8717,"lessonNumber":2684,"topics":9325,"summary":8719},[9311],{"title":8722,"path":8721,"lessonNumber":2690,"topics":9327,"summary":8723},[9311],{"title":8726,"path":8725,"lessonNumber":9329,"topics":9330,"summary":8727},10,[9311],{"title":8730,"path":8729,"lessonNumber":9332,"topics":9333,"summary":8731},11,[9311],{"title":8734,"path":8733,"lessonNumber":9335,"topics":9336,"summary":8735},12,[9311],{"title":8738,"path":8737,"lessonNumber":9338,"topics":9339,"summary":8739},13,[9311],{"title":8742,"path":8741,"lessonNumber":9341,"topics":9342,"summary":8743},14,[9311],{"title":8746,"path":8745,"lessonNumber":9344,"topics":9345,"summary":8747},15,[9311],{"title":8750,"path":8749,"lessonNumber":9347,"topics":9348,"summary":8751},16,[9311],{"title":8754,"path":8753,"lessonNumber":9350,"topics":9351,"summary":8755},17,[9311],{"title":8758,"path":8757,"lessonNumber":9353,"topics":9354,"summary":8759},18,[9311],{"title":8762,"path":8761,"lessonNumber":9356,"topics":9357,"summary":8763},19,[9311],{"title":8766,"path":8765,"lessonNumber":9359,"topics":9360,"summary":8767},20,[9311],{"module":7320,"moduleNumber":2678,"slug":9362,"lessons":9363},"applications",[9364,9366,9368,9370,9372,9374,9376,9378],{"title":8770,"path":8769,"lessonNumber":2642,"topics":9365,"summary":8771},[7320],{"title":8774,"path":8773,"lessonNumber":2648,"topics":9367,"summary":8775},[7320],{"title":8778,"path":8777,"lessonNumber":2654,"topics":9369,"summary":8779},[7320],{"title":8782,"path":8781,"lessonNumber":2660,"topics":9371,"summary":8783},[7320],{"title":8786,"path":8785,"lessonNumber":2666,"topics":9373,"summary":8787},[7320],{"title":8790,"path":8789,"lessonNumber":2672,"topics":9375,"summary":8791},[7320],{"title":8794,"path":8793,"lessonNumber":2678,"topics":9377,"summary":8795},[7320],{"title":8798,"path":8797,"lessonNumber":2684,"topics":9379,"summary":8799},[7320],{"module":8803,"moduleNumber":2684,"slug":9381,"lessons":9382},"speech",[9383,9385,9387,9389],{"title":8802,"path":8801,"lessonNumber":2642,"topics":9384,"summary":8804},[8803],{"title":8807,"path":8806,"lessonNumber":2648,"topics":9386,"summary":8808},[8803],{"title":8811,"path":8810,"lessonNumber":2654,"topics":9388,"summary":8812},[8803],{"title":8815,"path":8814,"lessonNumber":2660,"topics":9390,"summary":8816},[8803],"\u003Csvg style=\"width:100%;max-width:283.423px;height:auto\" xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" viewBox=\"-75 -75 212.567 134.637\">\u003Cg stroke=\"currentColor\" style=\"stroke-miterlimit:10;stroke-width:.4\">\u003Cg stroke=\"var(--tk-accent)\" style=\"stroke-width:.8\">\u003Cpath fill=\"none\" d=\"M-68.537-46.263H56.655V-71.87H-68.537Z\"\u002F>\u003Cg fill=\"var(--tk-accent)\" stroke=\"none\" font-size=\"8\">\u003Cg transform=\"translate(-33.46 -83.358)\">\u003Cpath d=\"M-3.820 27.843L-5.675 27.843L-5.675 27.550Q-5.406 27.550-5.238 27.505Q-5.070 27.460-5.070 27.284L-5.070 23.460Q-5.070 23.253-5.226 23.200Q-5.382 23.147-5.675 23.147L-5.675 22.851L-4.453 22.765L-4.453 23.230Q-4.222 23.007-3.908 22.886Q-3.593 22.765-3.253 22.765Q-2.781 22.765-2.377 23.011Q-1.972 23.257-1.740 23.673Q-1.507 24.089-1.507 24.565Q-1.507 24.940-1.656 25.269Q-1.804 25.597-2.074 25.849Q-2.343 26.101-2.687 26.235Q-3.031 26.370-3.390 26.370Q-3.679 26.370-3.951 26.249Q-4.222 26.128-4.429 25.917L-4.429 27.284Q-4.429 27.460-4.261 27.505Q-4.093 27.550-3.820 27.550L-3.820 27.843M-4.429 23.628L-4.429 25.468Q-4.277 25.757-4.015 25.937Q-3.753 26.116-3.445 26.116Q-3.160 26.116-2.937 25.978Q-2.714 25.839-2.562 25.608Q-2.410 25.378-2.332 25.106Q-2.253 24.835-2.253 24.565Q-2.253 24.233-2.378 23.876Q-2.503 23.519-2.752 23.282Q-3 23.046-3.347 23.046Q-3.671 23.046-3.966 23.202Q-4.261 23.358-4.429 23.628M-0.886 25.460Q-0.886 24.976-0.484 24.681Q-0.082 24.386 0.469 24.267Q1.020 24.147 1.512 24.147L1.512 23.858Q1.512 23.632 1.397 23.425Q1.282 23.218 1.084 23.099Q0.887 22.980 0.657 22.980Q0.231 22.980-0.054 23.085Q0.016 23.112 0.063 23.167Q0.110 23.222 0.135 23.292Q0.161 23.362 0.161 23.437Q0.161 23.542 0.110 23.634Q0.059 23.726-0.033 23.776Q-0.125 23.827-0.230 23.827Q-0.336 23.827-0.427 23.776Q-0.519 23.726-0.570 23.634Q-0.621 23.542-0.621 23.437Q-0.621 23.019-0.232 22.872Q0.157 22.726 0.657 22.726Q0.989 22.726 1.342 22.856Q1.696 22.987 1.924 23.241Q2.153 23.495 2.153 23.843L2.153 25.644Q2.153 25.776 2.225 25.886Q2.297 25.995 2.426 25.995Q2.551 25.995 2.620 25.890Q2.688 25.784 2.688 25.644L2.688 25.132L2.969 25.132L2.969 25.644Q2.969 25.847 2.852 26.005Q2.735 26.163 2.553 26.247Q2.372 26.331 2.168 26.331Q1.938 26.331 1.786 26.159Q1.633 25.987 1.602 25.757Q1.442 26.038 1.133 26.204Q0.825 26.370 0.473 26.370Q-0.039 26.370-0.462 26.147Q-0.886 25.925-0.886 25.460M-0.199 25.460Q-0.199 25.745 0.028 25.931Q0.254 26.116 0.547 26.116Q0.793 26.116 1.018 25.999Q1.243 25.882 1.377 25.679Q1.512 25.476 1.512 25.222L1.512 24.390Q1.247 24.390 0.961 24.444Q0.676 24.499 0.405 24.628Q0.133 24.757-0.033 24.964Q-0.199 25.171-0.199 25.460M5.270 26.292L3.289 26.292L3.289 25.995Q3.559 25.995 3.727 25.950Q3.895 25.905 3.895 25.733L3.895 23.597Q3.895 23.382 3.832 23.286Q3.770 23.190 3.653 23.169Q3.536 23.147 3.289 23.147L3.289 22.851L4.457 22.765L4.457 23.550Q4.536 23.339 4.688 23.153Q4.840 22.968 5.039 22.866Q5.239 22.765 5.465 22.765Q5.711 22.765 5.903 22.909Q6.094 23.054 6.094 23.284Q6.094 23.440 5.989 23.550Q5.883 23.659 5.727 23.659Q5.571 23.659 5.461 23.550Q5.352 23.440 5.352 23.284Q5.352 23.124 5.457 23.019Q5.133 23.019 4.918 23.247Q4.704 23.476 4.608 23.815Q4.512 24.155 4.512 24.460L4.512 25.733Q4.512 25.901 4.739 25.948Q4.965 25.995 5.270 25.995L5.270 26.292M6.575 24.538Q6.575 24.058 6.807 23.642Q7.039 23.226 7.450 22.976Q7.860 22.726 8.336 22.726Q9.067 22.726 9.465 23.167Q9.864 23.608 9.864 24.339Q9.864 24.444 9.770 24.468L7.321 24.468L7.321 24.538Q7.321 24.948 7.442 25.304Q7.563 25.659 7.834 25.876Q8.106 26.093 8.536 26.093Q8.899 26.093 9.196 25.864Q9.493 25.636 9.594 25.284Q9.602 25.237 9.688 25.222L9.770 25.222Q9.864 25.249 9.864 25.331Q9.864 25.339 9.856 25.370Q9.793 25.597 9.655 25.780Q9.516 25.964 9.325 26.097Q9.133 26.230 8.914 26.300Q8.696 26.370 8.457 26.370Q8.086 26.370 7.748 26.233Q7.411 26.097 7.143 25.845Q6.875 25.593 6.725 25.253Q6.575 24.913 6.575 24.538M7.329 24.230L9.289 24.230Q9.289 23.925 9.188 23.634Q9.086 23.343 8.870 23.161Q8.653 22.980 8.336 22.980Q8.036 22.980 7.805 23.167Q7.575 23.355 7.452 23.646Q7.329 23.937 7.329 24.230M12.282 26.292L10.426 26.292L10.426 25.995Q10.700 25.995 10.868 25.948Q11.036 25.901 11.036 25.733L11.036 23.597Q11.036 23.382 10.973 23.286Q10.911 23.190 10.791 23.169Q10.672 23.147 10.426 23.147L10.426 22.851L11.618 22.765L11.618 23.499Q11.731 23.284 11.924 23.116Q12.118 22.948 12.356 22.856Q12.594 22.765 12.848 22.765Q14.016 22.765 14.016 23.843L14.016 25.733Q14.016 25.901 14.186 25.948Q14.356 25.995 14.625 25.995L14.625 26.292L12.770 26.292L12.770 25.995Q13.043 25.995 13.211 25.948Q13.379 25.901 13.379 25.733L13.379 23.858Q13.379 23.476 13.258 23.247Q13.137 23.019 12.786 23.019Q12.473 23.019 12.219 23.181Q11.965 23.343 11.819 23.612Q11.672 23.882 11.672 24.179L11.672 25.733Q11.672 25.901 11.842 25.948Q12.012 25.995 12.282 25.995\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-33.46 -83.358)\">\u003Cpath d=\"M15.471 25.331L15.471 23.140L14.768 23.140L14.768 22.886Q15.124 22.886 15.366 22.653Q15.608 22.421 15.719 22.073Q15.831 21.726 15.831 21.370L16.112 21.370L16.112 22.843L17.288 22.843L17.288 23.140L16.112 23.140L16.112 25.315Q16.112 25.636 16.231 25.864Q16.350 26.093 16.631 26.093Q16.811 26.093 16.928 25.970Q17.046 25.847 17.098 25.667Q17.151 25.487 17.151 25.315L17.151 24.843L17.432 24.843L17.432 25.331Q17.432 25.585 17.327 25.825Q17.221 26.065 17.024 26.218Q16.827 26.370 16.569 26.370Q16.253 26.370 16.001 26.247Q15.749 26.124 15.610 25.890Q15.471 25.655 15.471 25.331M20.081 26.292L18.225 26.292L18.225 25.995Q18.499 25.995 18.667 25.948Q18.835 25.901 18.835 25.733L18.835 21.573Q18.835 21.358 18.772 21.263Q18.710 21.167 18.590 21.146Q18.471 21.124 18.225 21.124L18.225 20.827L19.448 20.741L19.448 23.444Q19.573 23.233 19.760 23.083Q19.948 22.933 20.174 22.849Q20.401 22.765 20.647 22.765Q21.815 22.765 21.815 23.843L21.815 25.733Q21.815 25.901 21.985 25.948Q22.155 25.995 22.424 25.995L22.424 26.292L20.569 26.292L20.569 25.995Q20.842 25.995 21.010 25.948Q21.178 25.901 21.178 25.733L21.178 23.858Q21.178 23.476 21.057 23.247Q20.936 23.019 20.585 23.019Q20.272 23.019 20.018 23.181Q19.764 23.343 19.618 23.612Q19.471 23.882 19.471 24.179L19.471 25.733Q19.471 25.901 19.641 25.948Q19.811 25.995 20.081 25.995L20.081 26.292M22.870 24.538Q22.870 24.058 23.102 23.642Q23.335 23.226 23.745 22.976Q24.155 22.726 24.631 22.726Q25.362 22.726 25.760 23.167Q26.159 23.608 26.159 24.339Q26.159 24.444 26.065 24.468L23.616 24.468L23.616 24.538Q23.616 24.948 23.737 25.304Q23.858 25.659 24.129 25.876Q24.401 26.093 24.831 26.093Q25.194 26.093 25.491 25.864Q25.788 25.636 25.889 25.284Q25.897 25.237 25.983 25.222L26.065 25.222Q26.159 25.249 26.159 25.331Q26.159 25.339 26.151 25.370Q26.088 25.597 25.950 25.780Q25.811 25.964 25.620 26.097Q25.428 26.230 25.210 26.300Q24.991 26.370 24.753 26.370Q24.381 26.370 24.044 26.233Q23.706 26.097 23.438 25.845Q23.171 25.593 23.020 25.253Q22.870 24.913 22.870 24.538M23.624 24.230L25.585 24.230Q25.585 23.925 25.483 23.634Q25.381 23.343 25.165 23.161Q24.948 22.980 24.631 22.980Q24.331 22.980 24.100 23.167Q23.870 23.355 23.747 23.646Q23.624 23.937 23.624 24.230M26.690 26.284L26.690 25.062Q26.690 25.034 26.721 25.003Q26.753 24.972 26.776 24.972L26.881 24.972Q26.952 24.972 26.967 25.034Q27.030 25.355 27.169 25.595Q27.307 25.835 27.540 25.976Q27.772 26.116 28.081 26.116Q28.319 26.116 28.528 26.056Q28.737 25.995 28.874 25.847Q29.010 25.698 29.010 25.452Q29.010 25.198 28.799 25.032Q28.588 24.866 28.319 24.812L27.698 24.698Q27.292 24.620 26.991 24.364Q26.690 24.108 26.690 23.733Q26.690 23.366 26.891 23.144Q27.092 22.921 27.417 22.823Q27.741 22.726 28.081 22.726Q28.546 22.726 28.842 22.933L29.065 22.749Q29.088 22.726 29.120 22.726L29.171 22.726Q29.202 22.726 29.229 22.753Q29.256 22.780 29.256 22.812L29.256 23.796Q29.256 23.827 29.231 23.856Q29.206 23.886 29.171 23.886L29.065 23.886Q29.030 23.886 29.003 23.858Q28.975 23.831 28.975 23.796Q28.975 23.397 28.723 23.177Q28.471 22.956 28.073 22.956Q27.717 22.956 27.434 23.079Q27.151 23.202 27.151 23.507Q27.151 23.726 27.352 23.858Q27.553 23.991 27.799 24.034L28.424 24.147Q28.854 24.237 29.163 24.534Q29.471 24.831 29.471 25.245Q29.471 25.815 29.073 26.093Q28.674 26.370 28.081 26.370Q27.530 26.370 27.178 26.034L26.881 26.347Q26.858 26.370 26.823 26.370L26.776 26.370Q26.753 26.370 26.721 26.339Q26.690 26.308 26.690 26.284M29.999 24.538Q29.999 24.058 30.231 23.642Q30.463 23.226 30.874 22.976Q31.284 22.726 31.760 22.726Q32.491 22.726 32.889 23.167Q33.288 23.608 33.288 24.339Q33.288 24.444 33.194 24.468L30.745 24.468L30.745 24.538Q30.745 24.948 30.866 25.304Q30.987 25.659 31.258 25.876Q31.530 26.093 31.960 26.093Q32.323 26.093 32.620 25.864Q32.917 25.636 33.018 25.284Q33.026 25.237 33.112 25.222L33.194 25.222Q33.288 25.249 33.288 25.331Q33.288 25.339 33.280 25.370Q33.217 25.597 33.079 25.780Q32.940 25.964 32.749 26.097Q32.557 26.230 32.338 26.300Q32.120 26.370 31.881 26.370Q31.510 26.370 31.172 26.233Q30.835 26.097 30.567 25.845Q30.299 25.593 30.149 25.253Q29.999 24.913 29.999 24.538M30.753 24.230L32.713 24.230Q32.713 23.925 32.612 23.634Q32.510 23.343 32.294 23.161Q32.077 22.980 31.760 22.980Q31.460 22.980 31.229 23.167Q30.999 23.355 30.876 23.646Q30.753 23.937 30.753 24.230M33.819 26.284L33.819 25.062Q33.819 25.034 33.850 25.003Q33.881 24.972 33.905 24.972L34.010 24.972Q34.081 24.972 34.096 25.034Q34.159 25.355 34.297 25.595Q34.436 25.835 34.669 25.976Q34.901 26.116 35.210 26.116Q35.448 26.116 35.657 26.056Q35.866 25.995 36.003 25.847Q36.139 25.698 36.139 25.452Q36.139 25.198 35.928 25.032Q35.717 24.866 35.448 24.812L34.827 24.698Q34.421 24.620 34.120 24.364Q33.819 24.108 33.819 23.733Q33.819 23.366 34.020 23.144Q34.221 22.921 34.546 22.823Q34.870 22.726 35.210 22.726Q35.674 22.726 35.971 22.933L36.194 22.749Q36.217 22.726 36.249 22.726L36.299 22.726Q36.331 22.726 36.358 22.753Q36.385 22.780 36.385 22.812L36.385 23.796Q36.385 23.827 36.360 23.856Q36.335 23.886 36.299 23.886L36.194 23.886Q36.159 23.886 36.131 23.858Q36.104 23.831 36.104 23.796Q36.104 23.397 35.852 23.177Q35.600 22.956 35.202 22.956Q34.846 22.956 34.563 23.079Q34.280 23.202 34.280 23.507Q34.280 23.726 34.481 23.858Q34.682 23.991 34.928 24.034L35.553 24.147Q35.983 24.237 36.292 24.534Q36.600 24.831 36.600 25.245Q36.600 25.815 36.202 26.093Q35.803 26.370 35.210 26.370Q34.659 26.370 34.307 26.034L34.010 26.347Q33.987 26.370 33.952 26.370L33.905 26.370Q33.881 26.370 33.850 26.339Q33.819 26.308 33.819 26.284\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-33.46 -83.358)\">\u003Cpath d=\"M42.844 26.933Q42.313 26.624 41.913 26.136Q41.512 25.647 41.301 25.054Q41.090 24.460 41.090 23.843Q41.090 23.226 41.299 22.638Q41.508 22.050 41.905 21.569Q42.301 21.089 42.836 20.765Q42.907 20.741 42.938 20.741L43.028 20.741Q43.126 20.753 43.192 20.819Q43.258 20.886 43.258 20.987Q43.258 21.132 43.157 21.194Q42.708 21.483 42.381 21.899Q42.055 22.315 41.893 22.808Q41.731 23.300 41.731 23.843Q41.731 24.249 41.827 24.636Q41.922 25.022 42.100 25.358Q42.278 25.694 42.538 25.978Q42.797 26.261 43.145 26.491Q43.258 26.569 43.258 26.706Q43.258 26.804 43.192 26.874Q43.126 26.944 43.028 26.956L42.938 26.956Q42.879 26.956 42.844 26.933M45.544 25.733Q45.544 25.511 45.710 25.345Q45.876 25.179 46.106 25.179Q46.254 25.179 46.381 25.257Q46.508 25.335 46.583 25.460Q46.657 25.585 46.657 25.733Q46.657 25.960 46.491 26.126Q46.325 26.292 46.106 26.292Q45.879 26.292 45.711 26.124Q45.544 25.956 45.544 25.733M49.790 25.733Q49.790 25.511 49.956 25.345Q50.122 25.179 50.352 25.179Q50.501 25.179 50.627 25.257Q50.754 25.335 50.829 25.460Q50.903 25.585 50.903 25.733Q50.903 25.960 50.737 26.126Q50.571 26.292 50.352 26.292Q50.126 26.292 49.958 26.124Q49.790 25.956 49.790 25.733M54.036 25.733Q54.036 25.511 54.202 25.345Q54.368 25.179 54.598 25.179Q54.747 25.179 54.874 25.257Q55.001 25.335 55.075 25.460Q55.149 25.585 55.149 25.733Q55.149 25.960 54.983 26.126Q54.817 26.292 54.598 26.292Q54.372 26.292 54.204 26.124Q54.036 25.956 54.036 25.733M57.754 26.956L57.669 26.956Q57.563 26.944 57.495 26.872Q57.426 26.800 57.426 26.706Q57.426 26.565 57.532 26.499Q57.868 26.284 58.137 25.995Q58.407 25.706 58.590 25.358Q58.774 25.011 58.864 24.632Q58.954 24.253 58.954 23.843Q58.954 23.304 58.790 22.812Q58.626 22.319 58.307 21.905Q57.989 21.491 57.547 21.202Q57.426 21.120 57.426 20.987Q57.426 20.890 57.495 20.821Q57.563 20.753 57.669 20.741L57.754 20.741Q57.809 20.741 57.844 20.765Q58.231 20.987 58.571 21.335Q58.911 21.683 59.131 22.077Q59.352 22.472 59.473 22.917Q59.594 23.362 59.594 23.843Q59.594 24.327 59.473 24.778Q59.352 25.230 59.127 25.626Q58.903 26.022 58.579 26.356Q58.254 26.690 57.852 26.933Q57.782 26.956 57.754 26.956\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003C\u002Fg>\u003Cpath fill=\"none\" d=\"M-68.537-12.12H56.655v-25.607H-68.537Z\"\u002F>\u003Cg stroke=\"none\" font-size=\"8\">\u003Cg transform=\"translate(-36.507 -48.755)\">\u003Cpath d=\"M-5.660 24.565Q-5.660 24.069-5.410 23.644Q-5.160 23.218-4.740 22.972Q-4.320 22.726-3.820 22.726Q-3.281 22.726-2.890 22.851Q-2.500 22.976-2.500 23.390Q-2.500 23.495-2.550 23.587Q-2.601 23.679-2.693 23.730Q-2.785 23.780-2.894 23.780Q-3 23.780-3.091 23.730Q-3.183 23.679-3.234 23.587Q-3.285 23.495-3.285 23.390Q-3.285 23.167-3.117 23.062Q-3.339 23.003-3.812 23.003Q-4.109 23.003-4.324 23.142Q-4.539 23.280-4.670 23.511Q-4.800 23.741-4.859 24.011Q-4.918 24.280-4.918 24.565Q-4.918 24.960-4.785 25.310Q-4.652 25.659-4.380 25.876Q-4.109 26.093-3.711 26.093Q-3.336 26.093-3.060 25.876Q-2.785 25.659-2.683 25.300Q-2.668 25.237-2.605 25.237L-2.500 25.237Q-2.464 25.237-2.439 25.265Q-2.414 25.292-2.414 25.331L-2.414 25.355Q-2.546 25.835-2.931 26.103Q-3.316 26.370-3.820 26.370Q-4.183 26.370-4.517 26.233Q-4.851 26.097-5.111 25.847Q-5.371 25.597-5.515 25.261Q-5.660 24.925-5.660 24.565M-1.925 24.597Q-1.925 24.093-1.670 23.661Q-1.414 23.230-0.978 22.978Q-0.543 22.726-0.043 22.726Q0.344 22.726 0.686 22.870Q1.028 23.015 1.289 23.276Q1.551 23.538 1.694 23.874Q1.836 24.210 1.836 24.597Q1.836 25.089 1.573 25.499Q1.309 25.909 0.879 26.140Q0.450 26.370-0.043 26.370Q-0.535 26.370-0.968 26.138Q-1.402 25.905-1.664 25.497Q-1.925 25.089-1.925 24.597M-0.043 26.093Q0.414 26.093 0.666 25.870Q0.918 25.647 1.006 25.296Q1.094 24.944 1.094 24.499Q1.094 24.069 1 23.731Q0.907 23.394 0.653 23.187Q0.399 22.980-0.043 22.980Q-0.691 22.980-0.935 23.396Q-1.179 23.812-1.179 24.499Q-1.179 24.944-1.091 25.296Q-1.003 25.647-0.752 25.870Q-0.500 26.093-0.043 26.093M3.004 25.339L3.004 23.597Q3.004 23.382 2.942 23.286Q2.879 23.190 2.760 23.169Q2.641 23.147 2.395 23.147L2.395 22.851L3.641 22.765L3.641 25.315L3.641 25.339Q3.641 25.651 3.696 25.813Q3.750 25.976 3.901 26.046Q4.051 26.116 4.372 26.116Q4.801 26.116 5.075 25.778Q5.348 25.440 5.348 24.995L5.348 23.597Q5.348 23.382 5.286 23.286Q5.223 23.190 5.104 23.169Q4.985 23.147 4.739 23.147L4.739 22.851L5.985 22.765L5.985 25.550Q5.985 25.761 6.047 25.856Q6.110 25.952 6.229 25.974Q6.348 25.995 6.594 25.995L6.594 26.292L5.372 26.370L5.372 25.749Q5.204 26.038 4.922 26.204Q4.641 26.370 4.321 26.370Q3.004 26.370 3.004 25.339M8.969 26.292L7.114 26.292L7.114 25.995Q7.387 25.995 7.555 25.948Q7.723 25.901 7.723 25.733L7.723 23.597Q7.723 23.382 7.661 23.286Q7.598 23.190 7.479 23.169Q7.360 23.147 7.114 23.147L7.114 22.851L8.305 22.765L8.305 23.499Q8.418 23.284 8.612 23.116Q8.805 22.948 9.043 22.856Q9.282 22.765 9.536 22.765Q10.704 22.765 10.704 23.843L10.704 25.733Q10.704 25.901 10.873 25.948Q11.043 25.995 11.313 25.995L11.313 26.292L9.457 26.292L9.457 25.995Q9.731 25.995 9.899 25.948Q10.067 25.901 10.067 25.733L10.067 23.858Q10.067 23.476 9.946 23.247Q9.825 23.019 9.473 23.019Q9.161 23.019 8.907 23.181Q8.653 23.343 8.506 23.612Q8.360 23.882 8.360 24.179L8.360 25.733Q8.360 25.901 8.530 25.948Q8.700 25.995 8.969 25.995\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-36.507 -48.755)\">\u003Cpath d=\"M12.159 25.331L12.159 23.140L11.456 23.140L11.456 22.886Q11.812 22.886 12.054 22.653Q12.296 22.421 12.407 22.073Q12.519 21.726 12.519 21.370L12.800 21.370L12.800 22.843L13.976 22.843L13.976 23.140L12.800 23.140L12.800 25.315Q12.800 25.636 12.919 25.864Q13.038 26.093 13.319 26.093Q13.499 26.093 13.616 25.970Q13.733 25.847 13.786 25.667Q13.839 25.487 13.839 25.315L13.839 24.843L14.120 24.843L14.120 25.331Q14.120 25.585 14.015 25.825Q13.909 26.065 13.712 26.218Q13.515 26.370 13.257 26.370Q12.941 26.370 12.689 26.247Q12.437 26.124 12.298 25.890Q12.159 25.655 12.159 25.331M14.839 24.538Q14.839 24.058 15.071 23.642Q15.304 23.226 15.714 22.976Q16.124 22.726 16.601 22.726Q17.331 22.726 17.730 23.167Q18.128 23.608 18.128 24.339Q18.128 24.444 18.034 24.468L15.585 24.468L15.585 24.538Q15.585 24.948 15.706 25.304Q15.827 25.659 16.099 25.876Q16.370 26.093 16.800 26.093Q17.163 26.093 17.460 25.864Q17.757 25.636 17.858 25.284Q17.866 25.237 17.952 25.222L18.034 25.222Q18.128 25.249 18.128 25.331Q18.128 25.339 18.120 25.370Q18.058 25.597 17.919 25.780Q17.780 25.964 17.589 26.097Q17.398 26.230 17.179 26.300Q16.960 26.370 16.722 26.370Q16.351 26.370 16.013 26.233Q15.675 26.097 15.407 25.845Q15.140 25.593 14.989 25.253Q14.839 24.913 14.839 24.538M15.593 24.230L17.554 24.230Q17.554 23.925 17.452 23.634Q17.351 23.343 17.134 23.161Q16.917 22.980 16.601 22.980Q16.300 22.980 16.069 23.167Q15.839 23.355 15.716 23.646Q15.593 23.937 15.593 24.230M20.624 26.292L18.644 26.292L18.644 25.995Q18.913 25.995 19.081 25.950Q19.249 25.905 19.249 25.733L19.249 23.597Q19.249 23.382 19.187 23.286Q19.124 23.190 19.007 23.169Q18.890 23.147 18.644 23.147L18.644 22.851L19.812 22.765L19.812 23.550Q19.890 23.339 20.042 23.153Q20.194 22.968 20.394 22.866Q20.593 22.765 20.819 22.765Q21.066 22.765 21.257 22.909Q21.448 23.054 21.448 23.284Q21.448 23.440 21.343 23.550Q21.237 23.659 21.081 23.659Q20.925 23.659 20.816 23.550Q20.706 23.440 20.706 23.284Q20.706 23.124 20.812 23.019Q20.487 23.019 20.273 23.247Q20.058 23.476 19.962 23.815Q19.866 24.155 19.866 24.460L19.866 25.733Q19.866 25.901 20.093 25.948Q20.319 25.995 20.624 25.995L20.624 26.292M21.972 26.284L21.972 25.062Q21.972 25.034 22.003 25.003Q22.034 24.972 22.058 24.972L22.163 24.972Q22.233 24.972 22.249 25.034Q22.312 25.355 22.450 25.595Q22.589 25.835 22.821 25.976Q23.054 26.116 23.362 26.116Q23.601 26.116 23.810 26.056Q24.019 25.995 24.155 25.847Q24.292 25.698 24.292 25.452Q24.292 25.198 24.081 25.032Q23.870 24.866 23.601 24.812L22.980 24.698Q22.573 24.620 22.273 24.364Q21.972 24.108 21.972 23.733Q21.972 23.366 22.173 23.144Q22.374 22.921 22.698 22.823Q23.023 22.726 23.362 22.726Q23.827 22.726 24.124 22.933L24.347 22.749Q24.370 22.726 24.401 22.726L24.452 22.726Q24.483 22.726 24.511 22.753Q24.538 22.780 24.538 22.812L24.538 23.796Q24.538 23.827 24.513 23.856Q24.487 23.886 24.452 23.886L24.347 23.886Q24.312 23.886 24.284 23.858Q24.257 23.831 24.257 23.796Q24.257 23.397 24.005 23.177Q23.753 22.956 23.355 22.956Q22.999 22.956 22.716 23.079Q22.433 23.202 22.433 23.507Q22.433 23.726 22.634 23.858Q22.835 23.991 23.081 24.034L23.706 24.147Q24.136 24.237 24.444 24.534Q24.753 24.831 24.753 25.245Q24.753 25.815 24.355 26.093Q23.956 26.370 23.362 26.370Q22.812 26.370 22.460 26.034L22.163 26.347Q22.140 26.370 22.105 26.370L22.058 26.370Q22.034 26.370 22.003 26.339Q21.972 26.308 21.972 26.284\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-36.507 -48.755)\">\u003Cpath d=\"M28.726 24.866Q28.605 24.866 28.513 24.774Q28.421 24.683 28.421 24.558Q28.421 24.480 28.470 24.405Q28.519 24.331 28.581 24.300L29.421 23.843L28.581 23.397Q28.421 23.312 28.421 23.140Q28.421 23.007 28.511 22.917Q28.601 22.827 28.726 22.827Q28.800 22.827 28.878 22.866L29.718 23.370L29.694 22.421Q29.694 22.292 29.784 22.208Q29.874 22.124 29.999 22.124Q30.124 22.124 30.214 22.210Q30.304 22.296 30.304 22.429L30.276 23.370L31.116 22.866Q31.202 22.827 31.269 22.827Q31.394 22.827 31.483 22.917Q31.573 23.007 31.573 23.140Q31.573 23.315 31.413 23.397L30.573 23.843L31.413 24.300Q31.483 24.331 31.528 24.405Q31.573 24.480 31.573 24.558Q31.573 24.683 31.482 24.774Q31.390 24.866 31.269 24.866Q31.202 24.866 31.116 24.827L30.276 24.323L30.304 25.276Q30.304 25.401 30.214 25.487Q30.124 25.573 29.999 25.573Q29.874 25.573 29.784 25.487Q29.694 25.401 29.694 25.269L29.718 24.323L28.878 24.827Q28.800 24.866 28.726 24.866\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-36.507 -48.755)\">\u003Cpath d=\"M36.777 25.370L36.777 24.155L35.563 24.155Q35.438 24.144 35.352 24.058Q35.266 23.972 35.266 23.843Q35.266 23.714 35.352 23.632Q35.438 23.550 35.563 23.538L36.777 23.538L36.777 22.315Q36.789 22.190 36.875 22.108Q36.961 22.026 37.090 22.026Q37.219 22.026 37.301 22.108Q37.383 22.190 37.395 22.315L37.395 23.538L38.609 23.538Q38.734 23.550 38.816 23.632Q38.898 23.714 38.898 23.843Q38.898 23.972 38.816 24.058Q38.734 24.144 38.609 24.155L37.395 24.155L37.395 25.370Q37.383 25.495 37.301 25.581Q37.219 25.667 37.090 25.667Q36.961 25.667 36.875 25.581Q36.789 25.495 36.777 25.370\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-36.507 -48.755)\">\u003Cpath d=\"M43.588 25.866L43.588 25.812Q43.588 25.647 43.729 25.522Q43.869 25.397 44.037 25.397Q44.205 25.397 44.346 25.519Q44.486 25.640 44.486 25.812L44.486 25.866Q44.486 26.042 44.346 26.167Q44.205 26.292 44.037 26.292Q43.869 26.292 43.729 26.165Q43.588 26.038 43.588 25.866M43.678 24.522L43.678 24.202Q43.678 23.921 43.803 23.661Q43.928 23.401 44.135 23.194Q44.279 23.050 44.541 22.858Q44.615 22.812 44.815 22.702Q45.014 22.593 45.076 22.522Q45.143 22.425 45.143 22.355Q45.143 22.101 44.785 22.013Q44.428 21.925 44.045 21.925Q43.533 21.925 43.291 22.132Q43.358 22.241 43.358 22.355Q43.358 22.526 43.242 22.646Q43.127 22.765 42.955 22.765Q42.779 22.765 42.664 22.640Q42.549 22.515 42.549 22.339Q42.549 22.069 42.690 21.880Q42.830 21.690 43.053 21.575Q43.275 21.460 43.525 21.411Q43.775 21.362 44.037 21.362Q44.436 21.362 44.828 21.442Q45.221 21.522 45.500 21.743Q45.779 21.964 45.779 22.355Q45.779 22.659 45.609 22.837Q45.440 23.015 45.096 23.231Q44.752 23.448 44.574 23.661Q44.397 23.874 44.397 24.237L44.397 24.522Q44.373 24.730 44.166 24.757L43.916 24.757Q43.705 24.733 43.678 24.522\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-36.507 -48.755)\">\u003Cpath d=\"M50.143 26.054L50.143 25.964Q50.186 25.757 50.393 25.733L50.815 25.733L50.815 23.405L50.393 23.405Q50.186 23.382 50.143 23.163L50.143 23.077Q50.190 22.866 50.393 22.843L51.210 22.843Q51.405 22.866 51.456 23.077L51.456 23.163L51.448 23.187Q51.675 23.007 51.948 22.905Q52.221 22.804 52.514 22.804Q52.862 22.804 53.100 22.944Q53.339 23.085 53.454 23.343Q53.569 23.601 53.569 23.956L53.569 25.733L53.995 25.733Q54.202 25.757 54.241 25.964L54.241 26.054Q54.202 26.269 53.995 26.292L52.600 26.292Q52.405 26.269 52.354 26.054L52.354 25.964Q52.405 25.753 52.600 25.733L52.928 25.733L52.928 23.987Q52.928 23.679 52.839 23.521Q52.749 23.362 52.456 23.362Q52.186 23.362 51.958 23.493Q51.729 23.624 51.593 23.853Q51.456 24.081 51.456 24.347L51.456 25.733L51.882 25.733Q52.089 25.757 52.128 25.964L52.128 26.054Q52.089 26.269 51.882 26.292L50.393 26.292Q50.186 26.269 50.143 26.054M55.886 25.733Q55.886 25.511 56.052 25.345Q56.218 25.179 56.448 25.179Q56.596 25.179 56.723 25.257Q56.850 25.335 56.925 25.460Q56.999 25.585 56.999 25.733Q56.999 25.960 56.833 26.126Q56.667 26.292 56.448 26.292Q56.221 26.292 56.053 26.124Q55.886 25.956 55.886 25.733M60.132 25.733Q60.132 25.511 60.298 25.345Q60.464 25.179 60.694 25.179Q60.843 25.179 60.969 25.257Q61.096 25.335 61.171 25.460Q61.245 25.585 61.245 25.733Q61.245 25.960 61.079 26.126Q60.913 26.292 60.694 26.292Q60.468 26.292 60.300 26.124Q60.132 25.956 60.132 25.733M62.757 26.054L62.757 25.964Q62.807 25.753 63.003 25.733L63.202 25.733L63.202 23.405L63.003 23.405Q62.796 23.382 62.757 23.163L62.757 23.077Q62.807 22.862 63.003 22.843L63.483 22.843Q63.675 22.866 63.733 23.077Q64.053 22.804 64.468 22.804Q64.659 22.804 64.827 22.913Q64.995 23.022 65.069 23.194Q65.245 23.003 65.468 22.903Q65.690 22.804 65.932 22.804Q66.350 22.804 66.505 23.146Q66.659 23.487 66.659 23.956L66.659 25.733L66.858 25.733Q67.069 25.757 67.108 25.964L67.108 26.054Q67.057 26.269 66.858 26.292L66.042 26.292Q65.846 26.269 65.796 26.054L65.796 25.964Q65.846 25.757 66.042 25.733L66.132 25.733L66.132 23.987Q66.132 23.362 65.882 23.362Q65.550 23.362 65.372 23.673Q65.194 23.983 65.194 24.347L65.194 25.733L65.397 25.733Q65.604 25.757 65.643 25.964L65.643 26.054Q65.593 26.269 65.397 26.292L64.581 26.292Q64.382 26.269 64.331 26.054L64.331 25.964Q64.382 25.757 64.581 25.733L64.667 25.733L64.667 23.987Q64.667 23.362 64.421 23.362Q64.089 23.362 63.911 23.675Q63.733 23.987 63.733 24.347L63.733 25.733L63.932 25.733Q64.139 25.757 64.178 25.964L64.178 26.054Q64.128 26.272 63.932 26.292L63.003 26.292Q62.796 26.269 62.757 26.054\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cpath fill=\"none\" d=\"M-68.537 22.024H56.655V-3.584H-68.537Z\"\u002F>\u003Cg stroke=\"none\" font-family=\"cmr8\" font-size=\"8\">\u003Cg transform=\"translate(-34.547 -15.072)\">\u003Cpath d=\"M-5.660 26.284L-5.660 25.062Q-5.660 25.034-5.628 25.003Q-5.597 24.972-5.574 24.972L-5.468 24.972Q-5.398 24.972-5.382 25.034Q-5.320 25.355-5.181 25.595Q-5.043 25.835-4.810 25.976Q-4.578 26.116-4.269 26.116Q-4.031 26.116-3.822 26.056Q-3.613 25.995-3.476 25.847Q-3.339 25.698-3.339 25.452Q-3.339 25.198-3.550 25.032Q-3.761 24.866-4.031 24.812L-4.652 24.698Q-5.058 24.620-5.359 24.364Q-5.660 24.108-5.660 23.733Q-5.660 23.366-5.459 23.144Q-5.257 22.921-4.933 22.823Q-4.609 22.726-4.269 22.726Q-3.804 22.726-3.507 22.933L-3.285 22.749Q-3.261 22.726-3.230 22.726L-3.179 22.726Q-3.148 22.726-3.121 22.753Q-3.093 22.780-3.093 22.812L-3.093 23.796Q-3.093 23.827-3.119 23.856Q-3.144 23.886-3.179 23.886L-3.285 23.886Q-3.320 23.886-3.347 23.858Q-3.375 23.831-3.375 23.796Q-3.375 23.397-3.627 23.177Q-3.878 22.956-4.277 22.956Q-4.632 22.956-4.916 23.079Q-5.199 23.202-5.199 23.507Q-5.199 23.726-4.998 23.858Q-4.796 23.991-4.550 24.034L-3.925 24.147Q-3.496 24.237-3.187 24.534Q-2.878 24.831-2.878 25.245Q-2.878 25.815-3.277 26.093Q-3.675 26.370-4.269 26.370Q-4.820 26.370-5.171 26.034L-5.468 26.347Q-5.492 26.370-5.527 26.370L-5.574 26.370Q-5.597 26.370-5.628 26.339Q-5.660 26.308-5.660 26.284M-2.351 24.538Q-2.351 24.058-2.119 23.642Q-1.886 23.226-1.476 22.976Q-1.066 22.726-0.589 22.726Q0.141 22.726 0.539 23.167Q0.938 23.608 0.938 24.339Q0.938 24.444 0.844 24.468L-1.605 24.468L-1.605 24.538Q-1.605 24.948-1.484 25.304Q-1.363 25.659-1.091 25.876Q-0.820 26.093-0.390 26.093Q-0.027 26.093 0.270 25.864Q0.567 25.636 0.668 25.284Q0.676 25.237 0.762 25.222L0.844 25.222Q0.938 25.249 0.938 25.331Q0.938 25.339 0.930 25.370Q0.868 25.597 0.729 25.780Q0.590 25.964 0.399 26.097Q0.207 26.230-0.011 26.300Q-0.230 26.370-0.468 26.370Q-0.839 26.370-1.177 26.233Q-1.515 26.097-1.783 25.845Q-2.050 25.593-2.201 25.253Q-2.351 24.913-2.351 24.538M-1.597 24.230L0.364 24.230Q0.364 23.925 0.262 23.634Q0.161 23.343-0.056 23.161Q-0.273 22.980-0.589 22.980Q-0.890 22.980-1.121 23.167Q-1.351 23.355-1.474 23.646Q-1.597 23.937-1.597 24.230M5.645 27.843L3.789 27.843L3.789 27.550Q4.059 27.550 4.227 27.505Q4.395 27.460 4.395 27.284L4.395 25.835Q4.192 26.081 3.891 26.226Q3.590 26.370 3.258 26.370Q2.774 26.370 2.362 26.128Q1.950 25.886 1.709 25.474Q1.469 25.062 1.469 24.565Q1.469 24.069 1.725 23.655Q1.981 23.241 2.411 23.003Q2.840 22.765 3.332 22.765Q3.688 22.765 3.995 22.944Q4.301 23.124 4.493 23.437L4.782 22.765L5.036 22.765L5.036 27.284Q5.036 27.460 5.204 27.505Q5.372 27.550 5.645 27.550L5.645 27.843M3.317 26.116Q3.684 26.116 3.977 25.884Q4.270 25.651 4.418 25.292L4.418 23.956Q4.325 23.573 4.051 23.310Q3.778 23.046 3.403 23.046Q3.043 23.046 2.770 23.276Q2.497 23.507 2.354 23.864Q2.211 24.222 2.211 24.573Q2.211 24.909 2.336 25.271Q2.461 25.632 2.713 25.874Q2.965 26.116 3.317 26.116M6.590 25.339L6.590 23.597Q6.590 23.382 6.528 23.286Q6.465 23.190 6.346 23.169Q6.227 23.147 5.981 23.147L5.981 22.851L7.227 22.765L7.227 25.315L7.227 25.339Q7.227 25.651 7.282 25.813Q7.336 25.976 7.487 26.046Q7.637 26.116 7.957 26.116Q8.387 26.116 8.661 25.778Q8.934 25.440 8.934 24.995L8.934 23.597Q8.934 23.382 8.872 23.286Q8.809 23.190 8.690 23.169Q8.571 23.147 8.325 23.147L8.325 22.851L9.571 22.765L9.571 25.550Q9.571 25.761 9.633 25.856Q9.696 25.952 9.815 25.974Q9.934 25.995 10.180 25.995L10.180 26.292L8.957 26.370L8.957 25.749Q8.789 26.038 8.508 26.204Q8.227 26.370 7.907 26.370Q6.590 26.370 6.590 25.339M10.625 24.538Q10.625 24.058 10.858 23.642Q11.090 23.226 11.500 22.976Q11.911 22.726 12.387 22.726Q13.118 22.726 13.516 23.167Q13.914 23.608 13.914 24.339Q13.914 24.444 13.821 24.468L11.372 24.468L11.372 24.538Q11.372 24.948 11.493 25.304Q11.614 25.659 11.885 25.876Q12.157 26.093 12.586 26.093Q12.950 26.093 13.247 25.864Q13.543 25.636 13.645 25.284Q13.653 25.237 13.739 25.222L13.821 25.222Q13.914 25.249 13.914 25.331Q13.914 25.339 13.907 25.370Q13.844 25.597 13.705 25.780Q13.567 25.964 13.375 26.097Q13.184 26.230 12.965 26.300Q12.747 26.370 12.508 26.370Q12.137 26.370 11.799 26.233Q11.461 26.097 11.194 25.845Q10.926 25.593 10.776 25.253Q10.625 24.913 10.625 24.538M11.379 24.230L13.340 24.230Q13.340 23.925 13.239 23.634Q13.137 23.343 12.920 23.161Q12.704 22.980 12.387 22.980Q12.086 22.980 11.856 23.167Q11.625 23.355 11.502 23.646Q11.379 23.937 11.379 24.230M16.332 26.292L14.477 26.292L14.477 25.995Q14.750 25.995 14.918 25.948Q15.086 25.901 15.086 25.733L15.086 23.597Q15.086 23.382 15.024 23.286Q14.961 23.190 14.842 23.169Q14.723 23.147 14.477 23.147L14.477 22.851L15.668 22.765L15.668 23.499Q15.782 23.284 15.975 23.116Q16.168 22.948 16.407 22.856Q16.645 22.765 16.899 22.765Q18.067 22.765 18.067 23.843L18.067 25.733Q18.067 25.901 18.237 25.948Q18.407 25.995 18.676 25.995L18.676 26.292L16.821 26.292L16.821 25.995Q17.094 25.995 17.262 25.948Q17.430 25.901 17.430 25.733L17.430 23.858Q17.430 23.476 17.309 23.247Q17.188 23.019 16.836 23.019Q16.524 23.019 16.270 23.181Q16.016 23.343 15.870 23.612Q15.723 23.882 15.723 24.179L15.723 25.733Q15.723 25.901 15.893 25.948Q16.063 25.995 16.332 25.995L16.332 26.292M19.164 24.565Q19.164 24.069 19.414 23.644Q19.664 23.218 20.084 22.972Q20.504 22.726 21.004 22.726Q21.543 22.726 21.934 22.851Q22.325 22.976 22.325 23.390Q22.325 23.495 22.274 23.587Q22.223 23.679 22.131 23.730Q22.039 23.780 21.930 23.780Q21.825 23.780 21.733 23.730Q21.641 23.679 21.590 23.587Q21.539 23.495 21.539 23.390Q21.539 23.167 21.707 23.062Q21.485 23.003 21.012 23.003Q20.715 23.003 20.500 23.142Q20.286 23.280 20.155 23.511Q20.024 23.741 19.965 24.011Q19.907 24.280 19.907 24.565Q19.907 24.960 20.039 25.310Q20.172 25.659 20.444 25.876Q20.715 26.093 21.114 26.093Q21.489 26.093 21.764 25.876Q22.039 25.659 22.141 25.300Q22.157 25.237 22.219 25.237L22.325 25.237Q22.360 25.237 22.385 25.265Q22.411 25.292 22.411 25.331L22.411 25.355Q22.278 25.835 21.893 26.103Q21.508 26.370 21.004 26.370Q20.641 26.370 20.307 26.233Q19.973 26.097 19.713 25.847Q19.454 25.597 19.309 25.261Q19.164 24.925 19.164 24.565M22.899 24.538Q22.899 24.058 23.131 23.642Q23.364 23.226 23.774 22.976Q24.184 22.726 24.661 22.726Q25.391 22.726 25.789 23.167Q26.188 23.608 26.188 24.339Q26.188 24.444 26.094 24.468L23.645 24.468L23.645 24.538Q23.645 24.948 23.766 25.304Q23.887 25.659 24.159 25.876Q24.430 26.093 24.860 26.093Q25.223 26.093 25.520 25.864Q25.817 25.636 25.918 25.284Q25.926 25.237 26.012 25.222L26.094 25.222Q26.188 25.249 26.188 25.331Q26.188 25.339 26.180 25.370Q26.118 25.597 25.979 25.780Q25.840 25.964 25.649 26.097Q25.457 26.230 25.239 26.300Q25.020 26.370 24.782 26.370Q24.411 26.370 24.073 26.233Q23.735 26.097 23.467 25.845Q23.200 25.593 23.049 25.253Q22.899 24.913 22.899 24.538M23.653 24.230L25.614 24.230Q25.614 23.925 25.512 23.634Q25.411 23.343 25.194 23.161Q24.977 22.980 24.661 22.980Q24.360 22.980 24.129 23.167Q23.899 23.355 23.776 23.646Q23.653 23.937 23.653 24.230M26.719 26.284L26.719 25.062Q26.719 25.034 26.750 25.003Q26.782 24.972 26.805 24.972L26.911 24.972Q26.981 24.972 26.997 25.034Q27.059 25.355 27.198 25.595Q27.336 25.835 27.569 25.976Q27.801 26.116 28.110 26.116Q28.348 26.116 28.557 26.056Q28.766 25.995 28.903 25.847Q29.039 25.698 29.039 25.452Q29.039 25.198 28.829 25.032Q28.618 24.866 28.348 24.812L27.727 24.698Q27.321 24.620 27.020 24.364Q26.719 24.108 26.719 23.733Q26.719 23.366 26.920 23.144Q27.122 22.921 27.446 22.823Q27.770 22.726 28.110 22.726Q28.575 22.726 28.872 22.933L29.094 22.749Q29.118 22.726 29.149 22.726L29.200 22.726Q29.231 22.726 29.258 22.753Q29.286 22.780 29.286 22.812L29.286 23.796Q29.286 23.827 29.260 23.856Q29.235 23.886 29.200 23.886L29.094 23.886Q29.059 23.886 29.032 23.858Q29.004 23.831 29.004 23.796Q29.004 23.397 28.752 23.177Q28.500 22.956 28.102 22.956Q27.747 22.956 27.463 23.079Q27.180 23.202 27.180 23.507Q27.180 23.726 27.381 23.858Q27.582 23.991 27.829 24.034L28.454 24.147Q28.883 24.237 29.192 24.534Q29.500 24.831 29.500 25.245Q29.500 25.815 29.102 26.093Q28.704 26.370 28.110 26.370Q27.559 26.370 27.207 26.034L26.911 26.347Q26.887 26.370 26.852 26.370L26.805 26.370Q26.782 26.370 26.750 26.339Q26.719 26.308 26.719 26.284M30.614 27.698Q30.614 27.675 30.645 27.628Q30.938 27.366 31.104 26.999Q31.270 26.632 31.270 26.245L31.270 26.187Q31.141 26.292 30.973 26.292Q30.782 26.292 30.645 26.159Q30.508 26.026 30.508 25.827Q30.508 25.636 30.645 25.503Q30.782 25.370 30.973 25.370Q31.274 25.370 31.399 25.640Q31.524 25.909 31.524 26.245Q31.524 26.694 31.342 27.108Q31.161 27.522 30.821 27.819Q30.797 27.843 30.758 27.843Q30.711 27.843 30.663 27.798Q30.614 27.753 30.614 27.698\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-34.547 -15.072)\">\u003Cpath d=\"M35.338 25.460Q35.338 24.976 35.740 24.681Q36.143 24.386 36.693 24.267Q37.244 24.147 37.736 24.147L37.736 23.858Q37.736 23.632 37.621 23.425Q37.506 23.218 37.309 23.099Q37.111 22.980 36.881 22.980Q36.455 22.980 36.170 23.085Q36.240 23.112 36.287 23.167Q36.334 23.222 36.359 23.292Q36.385 23.362 36.385 23.437Q36.385 23.542 36.334 23.634Q36.283 23.726 36.191 23.776Q36.100 23.827 35.994 23.827Q35.889 23.827 35.797 23.776Q35.705 23.726 35.654 23.634Q35.604 23.542 35.604 23.437Q35.604 23.019 35.992 22.872Q36.381 22.726 36.881 22.726Q37.213 22.726 37.566 22.856Q37.920 22.987 38.148 23.241Q38.377 23.495 38.377 23.843L38.377 25.644Q38.377 25.776 38.449 25.886Q38.522 25.995 38.650 25.995Q38.775 25.995 38.844 25.890Q38.912 25.784 38.912 25.644L38.912 25.132L39.193 25.132L39.193 25.644Q39.193 25.847 39.076 26.005Q38.959 26.163 38.777 26.247Q38.596 26.331 38.393 26.331Q38.162 26.331 38.010 26.159Q37.857 25.987 37.826 25.757Q37.666 26.038 37.357 26.204Q37.049 26.370 36.697 26.370Q36.186 26.370 35.762 26.147Q35.338 25.925 35.338 25.460M36.025 25.460Q36.025 25.745 36.252 25.931Q36.479 26.116 36.772 26.116Q37.018 26.116 37.242 25.999Q37.467 25.882 37.602 25.679Q37.736 25.476 37.736 25.222L37.736 24.390Q37.471 24.390 37.186 24.444Q36.900 24.499 36.629 24.628Q36.357 24.757 36.191 24.964Q36.025 25.171 36.025 25.460M41.416 26.292L39.561 26.292L39.561 25.995Q39.834 25.995 40.002 25.948Q40.170 25.901 40.170 25.733L40.170 23.597Q40.170 23.382 40.107 23.286Q40.045 23.190 39.926 23.169Q39.807 23.147 39.561 23.147L39.561 22.851L40.752 22.765L40.752 23.499Q40.865 23.284 41.059 23.116Q41.252 22.948 41.490 22.856Q41.729 22.765 41.982 22.765Q43.150 22.765 43.150 23.843L43.150 25.733Q43.150 25.901 43.320 25.948Q43.490 25.995 43.760 25.995L43.760 26.292L41.904 26.292L41.904 25.995Q42.178 25.995 42.346 25.948Q42.514 25.901 42.514 25.733L42.514 23.858Q42.514 23.476 42.393 23.247Q42.272 23.019 41.920 23.019Q41.607 23.019 41.354 23.181Q41.100 23.343 40.953 23.612Q40.807 23.882 40.807 24.179L40.807 25.733Q40.807 25.901 40.977 25.948Q41.147 25.995 41.416 25.995L41.416 26.292M44.248 24.565Q44.248 24.069 44.498 23.644Q44.748 23.218 45.168 22.972Q45.588 22.726 46.088 22.726Q46.627 22.726 47.018 22.851Q47.408 22.976 47.408 23.390Q47.408 23.495 47.357 23.587Q47.307 23.679 47.215 23.730Q47.123 23.780 47.014 23.780Q46.908 23.780 46.816 23.730Q46.725 23.679 46.674 23.587Q46.623 23.495 46.623 23.390Q46.623 23.167 46.791 23.062Q46.568 23.003 46.096 23.003Q45.799 23.003 45.584 23.142Q45.369 23.280 45.238 23.511Q45.107 23.741 45.049 24.011Q44.990 24.280 44.990 24.565Q44.990 24.960 45.123 25.310Q45.256 25.659 45.527 25.876Q45.799 26.093 46.197 26.093Q46.572 26.093 46.848 25.876Q47.123 25.659 47.225 25.300Q47.240 25.237 47.303 25.237L47.408 25.237Q47.443 25.237 47.469 25.265Q47.494 25.292 47.494 25.331L47.494 25.355Q47.361 25.835 46.977 26.103Q46.592 26.370 46.088 26.370Q45.725 26.370 45.391 26.233Q45.057 26.097 44.797 25.847Q44.537 25.597 44.393 25.261Q44.248 24.925 44.248 24.565\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-34.547 -15.072)\">\u003Cpath d=\"M49.684 26.292L47.828 26.292L47.828 25.995Q48.102 25.995 48.270 25.948Q48.438 25.901 48.438 25.733L48.438 21.573Q48.438 21.358 48.375 21.263Q48.313 21.167 48.194 21.146Q48.075 21.124 47.828 21.124L47.828 20.827L49.051 20.741L49.051 23.444Q49.176 23.233 49.364 23.083Q49.551 22.933 49.778 22.849Q50.004 22.765 50.250 22.765Q51.418 22.765 51.418 23.843L51.418 25.733Q51.418 25.901 51.588 25.948Q51.758 25.995 52.028 25.995L52.028 26.292L50.172 26.292L50.172 25.995Q50.446 25.995 50.614 25.948Q50.782 25.901 50.782 25.733L50.782 23.858Q50.782 23.476 50.661 23.247Q50.539 23.019 50.188 23.019Q49.875 23.019 49.621 23.181Q49.368 23.343 49.221 23.612Q49.075 23.882 49.075 24.179L49.075 25.733Q49.075 25.901 49.245 25.948Q49.414 25.995 49.684 25.995L49.684 26.292M52.473 24.597Q52.473 24.093 52.729 23.661Q52.985 23.230 53.420 22.978Q53.856 22.726 54.356 22.726Q54.743 22.726 55.084 22.870Q55.426 23.015 55.688 23.276Q55.950 23.538 56.092 23.874Q56.235 24.210 56.235 24.597Q56.235 25.089 55.971 25.499Q55.707 25.909 55.278 26.140Q54.848 26.370 54.356 26.370Q53.864 26.370 53.430 26.138Q52.996 25.905 52.735 25.497Q52.473 25.089 52.473 24.597M54.356 26.093Q54.813 26.093 55.065 25.870Q55.317 25.647 55.405 25.296Q55.493 24.944 55.493 24.499Q55.493 24.069 55.399 23.731Q55.305 23.394 55.051 23.187Q54.797 22.980 54.356 22.980Q53.707 22.980 53.463 23.396Q53.219 23.812 53.219 24.499Q53.219 24.944 53.307 25.296Q53.395 25.647 53.647 25.870Q53.899 26.093 54.356 26.093M58.727 26.292L56.746 26.292L56.746 25.995Q57.016 25.995 57.184 25.950Q57.352 25.905 57.352 25.733L57.352 23.597Q57.352 23.382 57.289 23.286Q57.227 23.190 57.110 23.169Q56.993 23.147 56.746 23.147L56.746 22.851L57.914 22.765L57.914 23.550Q57.993 23.339 58.145 23.153Q58.297 22.968 58.496 22.866Q58.696 22.765 58.922 22.765Q59.168 22.765 59.360 22.909Q59.551 23.054 59.551 23.284Q59.551 23.440 59.446 23.550Q59.340 23.659 59.184 23.659Q59.028 23.659 58.918 23.550Q58.809 23.440 58.809 23.284Q58.809 23.124 58.914 23.019Q58.590 23.019 58.375 23.247Q58.161 23.476 58.065 23.815Q57.969 24.155 57.969 24.460L57.969 25.733Q57.969 25.901 58.196 25.948Q58.422 25.995 58.727 25.995L58.727 26.292M60.075 26.284L60.075 25.062Q60.075 25.034 60.106 25.003Q60.137 24.972 60.161 24.972L60.266 24.972Q60.336 24.972 60.352 25.034Q60.414 25.355 60.553 25.595Q60.692 25.835 60.924 25.976Q61.157 26.116 61.465 26.116Q61.703 26.116 61.912 26.056Q62.121 25.995 62.258 25.847Q62.395 25.698 62.395 25.452Q62.395 25.198 62.184 25.032Q61.973 24.866 61.703 24.812L61.082 24.698Q60.676 24.620 60.375 24.364Q60.075 24.108 60.075 23.733Q60.075 23.366 60.276 23.144Q60.477 22.921 60.801 22.823Q61.125 22.726 61.465 22.726Q61.930 22.726 62.227 22.933L62.450 22.749Q62.473 22.726 62.504 22.726L62.555 22.726Q62.586 22.726 62.614 22.753Q62.641 22.780 62.641 22.812L62.641 23.796Q62.641 23.827 62.616 23.856Q62.590 23.886 62.555 23.886L62.450 23.886Q62.414 23.886 62.387 23.858Q62.360 23.831 62.360 23.796Q62.360 23.397 62.108 23.177Q61.856 22.956 61.457 22.956Q61.102 22.956 60.819 23.079Q60.536 23.202 60.536 23.507Q60.536 23.726 60.737 23.858Q60.938 23.991 61.184 24.034L61.809 24.147Q62.239 24.237 62.547 24.534Q62.856 24.831 62.856 25.245Q62.856 25.815 62.457 26.093Q62.059 26.370 61.465 26.370Q60.914 26.370 60.563 26.034L60.266 26.347Q60.243 26.370 60.207 26.370L60.161 26.370Q60.137 26.370 60.106 26.339Q60.075 26.308 60.075 26.284\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cpath fill=\"none\" d=\"M-68.537 56.167H56.655V30.56H-68.537Z\"\u002F>\u003Cg stroke=\"none\" font-family=\"cmr8\" font-size=\"8\">\u003Cg transform=\"translate(-33.08 19.072)\">\u003Cpath d=\"M-3.886 26.370Q-4.367 26.370-4.775 26.126Q-5.183 25.882-5.421 25.468Q-5.660 25.054-5.660 24.565Q-5.660 24.073-5.402 23.657Q-5.144 23.241-4.712 23.003Q-4.281 22.765-3.789 22.765Q-3.168 22.765-2.718 23.202L-2.718 21.573Q-2.718 21.358-2.781 21.263Q-2.843 21.167-2.961 21.146Q-3.078 21.124-3.324 21.124L-3.324 20.827L-2.101 20.741L-2.101 25.550Q-2.101 25.761-2.039 25.856Q-1.976 25.952-1.859 25.974Q-1.742 25.995-1.492 25.995L-1.492 26.292L-2.742 26.370L-2.742 25.886Q-3.207 26.370-3.886 26.370M-3.820 26.116Q-3.480 26.116-3.187 25.925Q-2.894 25.733-2.742 25.437L-2.742 23.605Q-2.890 23.331-3.152 23.175Q-3.414 23.019-3.726 23.019Q-4.351 23.019-4.634 23.466Q-4.918 23.913-4.918 24.573Q-4.918 25.218-4.666 25.667Q-4.414 26.116-3.820 26.116M0.875 26.292L-0.902 26.292L-0.902 25.995Q-0.628 25.995-0.461 25.948Q-0.293 25.901-0.293 25.733L-0.293 23.597Q-0.293 23.382-0.349 23.286Q-0.406 23.190-0.519 23.169Q-0.632 23.147-0.878 23.147L-0.878 22.851L0.321 22.765L0.321 25.733Q0.321 25.901 0.467 25.948Q0.614 25.995 0.875 25.995L0.875 26.292M-0.566 21.370Q-0.566 21.179-0.431 21.048Q-0.296 20.917-0.101 20.917Q0.020 20.917 0.123 20.980Q0.227 21.042 0.289 21.146Q0.352 21.249 0.352 21.370Q0.352 21.565 0.221 21.700Q0.090 21.835-0.101 21.835Q-0.300 21.835-0.433 21.702Q-0.566 21.569-0.566 21.370M1.418 26.284L1.418 25.062Q1.418 25.034 1.450 25.003Q1.481 24.972 1.504 24.972L1.610 24.972Q1.680 24.972 1.696 25.034Q1.758 25.355 1.897 25.595Q2.036 25.835 2.268 25.976Q2.500 26.116 2.809 26.116Q3.047 26.116 3.256 26.056Q3.465 25.995 3.602 25.847Q3.739 25.698 3.739 25.452Q3.739 25.198 3.528 25.032Q3.317 24.866 3.047 24.812L2.426 24.698Q2.020 24.620 1.719 24.364Q1.418 24.108 1.418 23.733Q1.418 23.366 1.620 23.144Q1.821 22.921 2.145 22.823Q2.469 22.726 2.809 22.726Q3.274 22.726 3.571 22.933L3.793 22.749Q3.817 22.726 3.848 22.726L3.899 22.726Q3.930 22.726 3.957 22.753Q3.985 22.780 3.985 22.812L3.985 23.796Q3.985 23.827 3.959 23.856Q3.934 23.886 3.899 23.886L3.793 23.886Q3.758 23.886 3.731 23.858Q3.704 23.831 3.704 23.796Q3.704 23.397 3.452 23.177Q3.200 22.956 2.801 22.956Q2.446 22.956 2.163 23.079Q1.879 23.202 1.879 23.507Q1.879 23.726 2.080 23.858Q2.282 23.991 2.528 24.034L3.153 24.147Q3.582 24.237 3.891 24.534Q4.200 24.831 4.200 25.245Q4.200 25.815 3.801 26.093Q3.403 26.370 2.809 26.370Q2.258 26.370 1.907 26.034L1.610 26.347Q1.586 26.370 1.551 26.370L1.504 26.370Q1.481 26.370 1.450 26.339Q1.418 26.308 1.418 26.284M4.168 27.269Q4.168 27.163 4.219 27.071Q4.270 26.980 4.362 26.929Q4.454 26.878 4.559 26.878Q4.668 26.878 4.760 26.929Q4.852 26.980 4.903 27.071Q4.954 27.163 4.954 27.269Q4.954 27.483 4.762 27.605Q4.918 27.667 5.145 27.667Q5.446 27.667 5.575 27.358Q5.704 27.050 5.704 26.683L5.704 23.597Q5.704 23.292 5.557 23.220Q5.411 23.147 5.032 23.147L5.032 22.851L6.321 22.765L6.321 26.706Q6.321 27.026 6.161 27.310Q6 27.593 5.723 27.759Q5.446 27.925 5.129 27.925Q4.770 27.925 4.469 27.761Q4.168 27.597 4.168 27.269M5.399 21.370Q5.399 21.187 5.538 21.052Q5.676 20.917 5.864 20.917Q6.051 20.917 6.186 21.048Q6.321 21.179 6.321 21.370Q6.321 21.569 6.188 21.702Q6.055 21.835 5.864 21.835Q5.672 21.835 5.536 21.698Q5.399 21.562 5.399 21.370M8.004 25.339L8.004 23.597Q8.004 23.382 7.942 23.286Q7.879 23.190 7.760 23.169Q7.641 23.147 7.395 23.147L7.395 22.851L8.641 22.765L8.641 25.315L8.641 25.339Q8.641 25.651 8.696 25.813Q8.750 25.976 8.901 26.046Q9.051 26.116 9.372 26.116Q9.801 26.116 10.075 25.778Q10.348 25.440 10.348 24.995L10.348 23.597Q10.348 23.382 10.286 23.286Q10.223 23.190 10.104 23.169Q9.985 23.147 9.739 23.147L9.739 22.851L10.985 22.765L10.985 25.550Q10.985 25.761 11.047 25.856Q11.110 25.952 11.229 25.974Q11.348 25.995 11.594 25.995L11.594 26.292L10.372 26.370L10.372 25.749Q10.204 26.038 9.922 26.204Q9.641 26.370 9.321 26.370Q8.004 26.370 8.004 25.339M13.969 26.292L12.114 26.292L12.114 25.995Q12.387 25.995 12.555 25.948Q12.723 25.901 12.723 25.733L12.723 23.597Q12.723 23.382 12.661 23.286Q12.598 23.190 12.479 23.169Q12.360 23.147 12.114 23.147L12.114 22.851L13.305 22.765L13.305 23.499Q13.418 23.284 13.612 23.116Q13.805 22.948 14.043 22.856Q14.282 22.765 14.536 22.765Q15.704 22.765 15.704 23.843L15.704 25.733Q15.704 25.901 15.873 25.948Q16.043 25.995 16.313 25.995L16.313 26.292L14.457 26.292L14.457 25.995Q14.731 25.995 14.899 25.948Q15.067 25.901 15.067 25.733L15.067 23.858Q15.067 23.476 14.946 23.247Q14.825 23.019 14.473 23.019Q14.161 23.019 13.907 23.181Q13.653 23.343 13.506 23.612Q13.360 23.882 13.360 24.179L13.360 25.733Q13.360 25.901 13.530 25.948Q13.700 25.995 13.969 25.995L13.969 26.292M16.801 24.565Q16.801 24.069 17.051 23.644Q17.301 23.218 17.721 22.972Q18.141 22.726 18.641 22.726Q19.180 22.726 19.571 22.851Q19.961 22.976 19.961 23.390Q19.961 23.495 19.911 23.587Q19.860 23.679 19.768 23.730Q19.676 23.780 19.567 23.780Q19.461 23.780 19.370 23.730Q19.278 23.679 19.227 23.587Q19.176 23.495 19.176 23.390Q19.176 23.167 19.344 23.062Q19.122 23.003 18.649 23.003Q18.352 23.003 18.137 23.142Q17.922 23.280 17.791 23.511Q17.661 23.741 17.602 24.011Q17.543 24.280 17.543 24.565Q17.543 24.960 17.676 25.310Q17.809 25.659 18.080 25.876Q18.352 26.093 18.750 26.093Q19.125 26.093 19.401 25.876Q19.676 25.659 19.778 25.300Q19.793 25.237 19.856 25.237L19.961 25.237Q19.997 25.237 20.022 25.265Q20.047 25.292 20.047 25.331L20.047 25.355Q19.914 25.835 19.530 26.103Q19.145 26.370 18.641 26.370Q18.278 26.370 17.944 26.233Q17.610 26.097 17.350 25.847Q17.090 25.597 16.946 25.261Q16.801 24.925 16.801 24.565M21.161 25.331L21.161 23.140L20.457 23.140L20.457 22.886Q20.813 22.886 21.055 22.653Q21.297 22.421 21.409 22.073Q21.520 21.726 21.520 21.370L21.801 21.370L21.801 22.843L22.977 22.843L22.977 23.140L21.801 23.140L21.801 25.315Q21.801 25.636 21.920 25.864Q22.039 26.093 22.321 26.093Q22.500 26.093 22.618 25.970Q22.735 25.847 22.788 25.667Q22.840 25.487 22.840 25.315L22.840 24.843L23.122 24.843L23.122 25.331Q23.122 25.585 23.016 25.825Q22.911 26.065 22.713 26.218Q22.516 26.370 22.258 26.370Q21.942 26.370 21.690 26.247Q21.438 26.124 21.299 25.890Q21.161 25.655 21.161 25.331M25.700 26.292L23.922 26.292L23.922 25.995Q24.196 25.995 24.364 25.948Q24.532 25.901 24.532 25.733L24.532 23.597Q24.532 23.382 24.475 23.286Q24.418 23.190 24.305 23.169Q24.192 23.147 23.946 23.147L23.946 22.851L25.145 22.765L25.145 25.733Q25.145 25.901 25.291 25.948Q25.438 25.995 25.700 25.995L25.700 26.292M24.258 21.370Q24.258 21.179 24.393 21.048Q24.528 20.917 24.723 20.917Q24.844 20.917 24.948 20.980Q25.051 21.042 25.114 21.146Q25.176 21.249 25.176 21.370Q25.176 21.565 25.045 21.700Q24.914 21.835 24.723 21.835Q24.524 21.835 24.391 21.702Q24.258 21.569 24.258 21.370M26.200 24.597Q26.200 24.093 26.455 23.661Q26.711 23.230 27.147 22.978Q27.582 22.726 28.082 22.726Q28.469 22.726 28.811 22.870Q29.153 23.015 29.414 23.276Q29.676 23.538 29.819 23.874Q29.961 24.210 29.961 24.597Q29.961 25.089 29.698 25.499Q29.434 25.909 29.004 26.140Q28.575 26.370 28.082 26.370Q27.590 26.370 27.157 26.138Q26.723 25.905 26.461 25.497Q26.200 25.089 26.200 24.597M28.082 26.093Q28.539 26.093 28.791 25.870Q29.043 25.647 29.131 25.296Q29.219 24.944 29.219 24.499Q29.219 24.069 29.125 23.731Q29.032 23.394 28.778 23.187Q28.524 22.980 28.082 22.980Q27.434 22.980 27.190 23.396Q26.946 23.812 26.946 24.499Q26.946 24.944 27.034 25.296Q27.122 25.647 27.373 25.870Q27.625 26.093 28.082 26.093M32.375 26.292L30.520 26.292L30.520 25.995Q30.793 25.995 30.961 25.948Q31.129 25.901 31.129 25.733L31.129 23.597Q31.129 23.382 31.067 23.286Q31.004 23.190 30.885 23.169Q30.766 23.147 30.520 23.147L30.520 22.851L31.711 22.765L31.711 23.499Q31.825 23.284 32.018 23.116Q32.211 22.948 32.450 22.856Q32.688 22.765 32.942 22.765Q34.110 22.765 34.110 23.843L34.110 25.733Q34.110 25.901 34.280 25.948Q34.450 25.995 34.719 25.995L34.719 26.292L32.864 26.292L32.864 25.995Q33.137 25.995 33.305 25.948Q33.473 25.901 33.473 25.733L33.473 23.858Q33.473 23.476 33.352 23.247Q33.231 23.019 32.879 23.019Q32.567 23.019 32.313 23.181Q32.059 23.343 31.913 23.612Q31.766 23.882 31.766 24.179L31.766 25.733Q31.766 25.901 31.936 25.948Q32.106 25.995 32.375 25.995\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-33.08 19.072)\">\u003Cpath d=\"M40.405 28.284Q39.792 27.827 39.390 27.192Q38.987 26.558 38.792 25.812Q38.597 25.065 38.597 24.292Q38.597 23.519 38.792 22.772Q38.987 22.026 39.390 21.392Q39.792 20.757 40.405 20.300Q40.417 20.296 40.425 20.294Q40.433 20.292 40.444 20.292L40.522 20.292Q40.561 20.292 40.587 20.319Q40.612 20.347 40.612 20.390Q40.612 20.440 40.581 20.460Q40.073 20.913 39.751 21.536Q39.429 22.159 39.288 22.855Q39.147 23.550 39.147 24.292Q39.147 25.026 39.286 25.726Q39.425 26.425 39.749 27.050Q40.073 27.675 40.581 28.124Q40.612 28.144 40.612 28.194Q40.612 28.237 40.587 28.265Q40.561 28.292 40.522 28.292L40.444 28.292Q40.436 28.288 40.427 28.286Q40.417 28.284 40.405 28.284M43.214 27.843L41.358 27.843L41.358 27.550Q41.628 27.550 41.796 27.505Q41.964 27.460 41.964 27.284L41.964 23.460Q41.964 23.253 41.808 23.200Q41.651 23.147 41.358 23.147L41.358 22.851L42.581 22.765L42.581 23.230Q42.811 23.007 43.126 22.886Q43.440 22.765 43.780 22.765Q44.253 22.765 44.657 23.011Q45.061 23.257 45.294 23.673Q45.526 24.089 45.526 24.565Q45.526 24.940 45.378 25.269Q45.229 25.597 44.960 25.849Q44.690 26.101 44.347 26.235Q44.003 26.370 43.643 26.370Q43.354 26.370 43.083 26.249Q42.811 26.128 42.604 25.917L42.604 27.284Q42.604 27.460 42.772 27.505Q42.940 27.550 43.214 27.550L43.214 27.843M42.604 23.628L42.604 25.468Q42.757 25.757 43.018 25.937Q43.280 26.116 43.589 26.116Q43.874 26.116 44.097 25.978Q44.319 25.839 44.472 25.608Q44.624 25.378 44.702 25.106Q44.780 24.835 44.780 24.565Q44.780 24.233 44.655 23.876Q44.530 23.519 44.282 23.282Q44.034 23.046 43.686 23.046Q43.362 23.046 43.067 23.202Q42.772 23.358 42.604 23.628M47.909 26.292L46.132 26.292L46.132 25.995Q46.405 25.995 46.573 25.948Q46.741 25.901 46.741 25.733L46.741 23.597Q46.741 23.382 46.684 23.286Q46.628 23.190 46.515 23.169Q46.401 23.147 46.155 23.147L46.155 22.851L47.354 22.765L47.354 25.733Q47.354 25.901 47.501 25.948Q47.647 25.995 47.909 25.995L47.909 26.292M46.468 21.370Q46.468 21.179 46.602 21.048Q46.737 20.917 46.933 20.917Q47.054 20.917 47.157 20.980Q47.261 21.042 47.323 21.146Q47.386 21.249 47.386 21.370Q47.386 21.565 47.255 21.700Q47.124 21.835 46.933 21.835Q46.733 21.835 46.600 21.702Q46.468 21.569 46.468 21.370M50.292 27.843L48.436 27.843L48.436 27.550Q48.706 27.550 48.874 27.505Q49.042 27.460 49.042 27.284L49.042 23.460Q49.042 23.253 48.886 23.200Q48.729 23.147 48.436 23.147L48.436 22.851L49.659 22.765L49.659 23.230Q49.890 23.007 50.204 22.886Q50.518 22.765 50.858 22.765Q51.331 22.765 51.735 23.011Q52.140 23.257 52.372 23.673Q52.604 24.089 52.604 24.565Q52.604 24.940 52.456 25.269Q52.308 25.597 52.038 25.849Q51.768 26.101 51.425 26.235Q51.081 26.370 50.722 26.370Q50.433 26.370 50.161 26.249Q49.890 26.128 49.683 25.917L49.683 27.284Q49.683 27.460 49.850 27.505Q50.018 27.550 50.292 27.550L50.292 27.843M49.683 23.628L49.683 25.468Q49.835 25.757 50.097 25.937Q50.358 26.116 50.667 26.116Q50.952 26.116 51.175 25.978Q51.397 25.839 51.550 25.608Q51.702 25.378 51.780 25.106Q51.858 24.835 51.858 24.565Q51.858 24.233 51.733 23.876Q51.608 23.519 51.360 23.282Q51.112 23.046 50.765 23.046Q50.440 23.046 50.145 23.202Q49.850 23.358 49.683 23.628\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-33.08 19.072)\">\u003Cpath d=\"M53.373 24.538Q53.373 24.058 53.606 23.642Q53.838 23.226 54.248 22.976Q54.658 22.726 55.135 22.726Q55.865 22.726 56.264 23.167Q56.662 23.608 56.662 24.339Q56.662 24.444 56.569 24.468L54.119 24.468L54.119 24.538Q54.119 24.948 54.240 25.304Q54.362 25.659 54.633 25.876Q54.905 26.093 55.334 26.093Q55.697 26.093 55.994 25.864Q56.291 25.636 56.393 25.284Q56.401 25.237 56.487 25.222L56.569 25.222Q56.662 25.249 56.662 25.331Q56.662 25.339 56.655 25.370Q56.592 25.597 56.453 25.780Q56.315 25.964 56.123 26.097Q55.932 26.230 55.713 26.300Q55.494 26.370 55.256 26.370Q54.885 26.370 54.547 26.233Q54.209 26.097 53.942 25.845Q53.674 25.593 53.524 25.253Q53.373 24.913 53.373 24.538M54.127 24.230L56.088 24.230Q56.088 23.925 55.987 23.634Q55.885 23.343 55.668 23.161Q55.451 22.980 55.135 22.980Q54.834 22.980 54.604 23.167Q54.373 23.355 54.250 23.646Q54.127 23.937 54.127 24.230M57.553 28.292L57.471 28.292Q57.436 28.292 57.410 28.263Q57.385 28.233 57.385 28.194Q57.385 28.144 57.416 28.124Q57.803 27.788 58.086 27.339Q58.369 26.890 58.535 26.390Q58.701 25.890 58.776 25.372Q58.850 24.855 58.850 24.292Q58.850 23.722 58.776 23.206Q58.701 22.690 58.535 22.194Q58.369 21.698 58.090 21.251Q57.811 20.804 57.416 20.460Q57.385 20.440 57.385 20.390Q57.385 20.351 57.410 20.321Q57.436 20.292 57.471 20.292L57.553 20.292Q57.565 20.292 57.574 20.294Q57.584 20.296 57.592 20.300Q58.205 20.757 58.608 21.392Q59.010 22.026 59.205 22.772Q59.401 23.519 59.401 24.292Q59.401 25.065 59.205 25.812Q59.010 26.558 58.608 27.192Q58.205 27.827 57.592 28.284Q57.580 28.284 57.572 28.286Q57.565 28.288 57.553 28.292\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cpath fill=\"none\" d=\"M-5.94-45.863v5.936\"\u002F>\u003Cpath stroke=\"none\" d=\"m-5.94-37.927 1.6-3.2-1.6 1.2-1.6-1.2\"\u002F>\u003Cpath fill=\"none\" d=\"M-5.94-11.92v6.136\"\u002F>\u003Cpath stroke=\"none\" d=\"m-5.94-3.784 1.6-3.2-1.6 1.2-1.6-1.2\"\u002F>\u003Cpath fill=\"none\" d=\"M-5.94 22.224v6.136\"\u002F>\u003Cpath stroke=\"none\" d=\"m-5.94 30.36 1.6-3.2-1.6 1.2-1.6-1.2\"\u002F>\u003Cg fill=\"var(--tk-accent)\" stroke=\"none\" font-family=\"cmr8\" font-size=\"8\">\u003Cg transform=\"translate(86.046 -83.358)\">\u003Cpath d=\"M-4.789 26.292L-5.070 26.292L-5.070 21.573Q-5.070 21.358-5.132 21.263Q-5.195 21.167-5.312 21.146Q-5.429 21.124-5.675 21.124L-5.675 20.827L-4.453 20.741L-4.453 23.230Q-3.976 22.765-3.277 22.765Q-2.796 22.765-2.388 23.009Q-1.980 23.253-1.744 23.667Q-1.507 24.081-1.507 24.565Q-1.507 24.940-1.656 25.269Q-1.804 25.597-2.074 25.849Q-2.343 26.101-2.687 26.235Q-3.031 26.370-3.390 26.370Q-3.711 26.370-4.009 26.222Q-4.308 26.073-4.515 25.812L-4.789 26.292M-4.429 23.620L-4.429 25.460Q-4.277 25.757-4.017 25.937Q-3.757 26.116-3.445 26.116Q-3.019 26.116-2.752 25.897Q-2.484 25.679-2.369 25.333Q-2.253 24.987-2.253 24.565Q-2.253 23.917-2.502 23.468Q-2.750 23.019-3.347 23.019Q-3.683 23.019-3.972 23.177Q-4.261 23.335-4.429 23.620M0.875 26.292L-0.902 26.292L-0.902 25.995Q-0.628 25.995-0.461 25.948Q-0.293 25.901-0.293 25.733L-0.293 23.597Q-0.293 23.382-0.349 23.286Q-0.406 23.190-0.519 23.169Q-0.632 23.147-0.878 23.147L-0.878 22.851L0.321 22.765L0.321 25.733Q0.321 25.901 0.467 25.948Q0.614 25.995 0.875 25.995L0.875 26.292M-0.566 21.370Q-0.566 21.179-0.431 21.048Q-0.296 20.917-0.101 20.917Q0.020 20.917 0.123 20.980Q0.227 21.042 0.289 21.146Q0.352 21.249 0.352 21.370Q0.352 21.565 0.221 21.700Q0.090 21.835-0.101 21.835Q-0.300 21.835-0.433 21.702Q-0.566 21.569-0.566 21.370M3.305 26.292L1.450 26.292L1.450 25.995Q1.723 25.995 1.891 25.948Q2.059 25.901 2.059 25.733L2.059 23.597Q2.059 23.382 1.997 23.286Q1.934 23.190 1.815 23.169Q1.696 23.147 1.450 23.147L1.450 22.851L2.641 22.765L2.641 23.499Q2.754 23.284 2.948 23.116Q3.141 22.948 3.379 22.856Q3.618 22.765 3.872 22.765Q5.039 22.765 5.039 23.843L5.039 25.733Q5.039 25.901 5.209 25.948Q5.379 25.995 5.649 25.995L5.649 26.292L3.793 26.292L3.793 25.995Q4.067 25.995 4.235 25.948Q4.403 25.901 4.403 25.733L4.403 23.858Q4.403 23.476 4.282 23.247Q4.161 23.019 3.809 23.019Q3.497 23.019 3.243 23.181Q2.989 23.343 2.842 23.612Q2.696 23.882 2.696 24.179L2.696 25.733Q2.696 25.901 2.866 25.948Q3.036 25.995 3.305 25.995L3.305 26.292M7.911 26.370Q7.430 26.370 7.022 26.126Q6.614 25.882 6.375 25.468Q6.137 25.054 6.137 24.565Q6.137 24.073 6.395 23.657Q6.653 23.241 7.084 23.003Q7.516 22.765 8.008 22.765Q8.629 22.765 9.079 23.202L9.079 21.573Q9.079 21.358 9.016 21.263Q8.954 21.167 8.836 21.146Q8.719 21.124 8.473 21.124L8.473 20.827L9.696 20.741L9.696 25.550Q9.696 25.761 9.758 25.856Q9.821 25.952 9.938 25.974Q10.055 25.995 10.305 25.995L10.305 26.292L9.055 26.370L9.055 25.886Q8.590 26.370 7.911 26.370M7.977 26.116Q8.317 26.116 8.610 25.925Q8.903 25.733 9.055 25.437L9.055 23.605Q8.907 23.331 8.645 23.175Q8.383 23.019 8.071 23.019Q7.446 23.019 7.163 23.466Q6.879 23.913 6.879 24.573Q6.879 25.218 7.131 25.667Q7.383 26.116 7.977 26.116M10.856 26.284L10.856 25.062Q10.856 25.034 10.887 25.003Q10.918 24.972 10.942 24.972L11.047 24.972Q11.118 24.972 11.133 25.034Q11.196 25.355 11.334 25.595Q11.473 25.835 11.705 25.976Q11.938 26.116 12.247 26.116Q12.485 26.116 12.694 26.056Q12.903 25.995 13.039 25.847Q13.176 25.698 13.176 25.452Q13.176 25.198 12.965 25.032Q12.754 24.866 12.485 24.812L11.864 24.698Q11.457 24.620 11.157 24.364Q10.856 24.108 10.856 23.733Q10.856 23.366 11.057 23.144Q11.258 22.921 11.582 22.823Q11.907 22.726 12.247 22.726Q12.711 22.726 13.008 22.933L13.231 22.749Q13.254 22.726 13.286 22.726L13.336 22.726Q13.368 22.726 13.395 22.753Q13.422 22.780 13.422 22.812L13.422 23.796Q13.422 23.827 13.397 23.856Q13.372 23.886 13.336 23.886L13.231 23.886Q13.196 23.886 13.168 23.858Q13.141 23.831 13.141 23.796Q13.141 23.397 12.889 23.177Q12.637 22.956 12.239 22.956Q11.883 22.956 11.600 23.079Q11.317 23.202 11.317 23.507Q11.317 23.726 11.518 23.858Q11.719 23.991 11.965 24.034L12.590 24.147Q13.020 24.237 13.329 24.534Q13.637 24.831 13.637 25.245Q13.637 25.815 13.239 26.093Q12.840 26.370 12.247 26.370Q11.696 26.370 11.344 26.034L11.047 26.347Q11.024 26.370 10.989 26.370L10.942 26.370Q10.918 26.370 10.887 26.339Q10.856 26.308 10.856 26.284\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(86.046 -83.358)\">\u003Cpath d=\"M17.637 25.331L17.637 23.140L16.934 23.140L16.934 22.886Q17.290 22.886 17.532 22.653Q17.774 22.421 17.885 22.073Q17.997 21.726 17.997 21.370L18.278 21.370L18.278 22.843L19.454 22.843L19.454 23.140L18.278 23.140L18.278 25.315Q18.278 25.636 18.397 25.864Q18.516 26.093 18.797 26.093Q18.977 26.093 19.094 25.970Q19.212 25.847 19.264 25.667Q19.317 25.487 19.317 25.315L19.317 24.843L19.598 24.843L19.598 25.331Q19.598 25.585 19.493 25.825Q19.387 26.065 19.190 26.218Q18.993 26.370 18.735 26.370Q18.419 26.370 18.167 26.247Q17.915 26.124 17.776 25.890Q17.637 25.655 17.637 25.331M22.176 26.292L20.399 26.292L20.399 25.995Q20.672 25.995 20.840 25.948Q21.008 25.901 21.008 25.733L21.008 23.597Q21.008 23.382 20.952 23.286Q20.895 23.190 20.782 23.169Q20.669 23.147 20.422 23.147L20.422 22.851L21.622 22.765L21.622 25.733Q21.622 25.901 21.768 25.948Q21.915 25.995 22.176 25.995L22.176 26.292M20.735 21.370Q20.735 21.179 20.870 21.048Q21.004 20.917 21.200 20.917Q21.321 20.917 21.424 20.980Q21.528 21.042 21.590 21.146Q21.653 21.249 21.653 21.370Q21.653 21.565 21.522 21.700Q21.391 21.835 21.200 21.835Q21.001 21.835 20.868 21.702Q20.735 21.569 20.735 21.370M22.676 26.901Q22.676 26.620 22.887 26.409Q23.098 26.198 23.383 26.108Q23.227 25.983 23.149 25.794Q23.071 25.605 23.071 25.405Q23.071 25.050 23.301 24.757Q22.934 24.417 22.934 23.948Q22.934 23.597 23.137 23.327Q23.340 23.058 23.661 22.911Q23.981 22.765 24.325 22.765Q24.844 22.765 25.215 23.046Q25.579 22.675 26.126 22.675Q26.305 22.675 26.432 22.802Q26.559 22.929 26.559 23.108Q26.559 23.214 26.481 23.292Q26.403 23.370 26.294 23.370Q26.184 23.370 26.108 23.294Q26.032 23.218 26.032 23.108Q26.032 23.007 26.071 22.956Q26.079 22.948 26.083 22.942Q26.087 22.937 26.087 22.933Q25.712 22.933 25.391 23.187Q25.712 23.526 25.712 23.948Q25.712 24.218 25.594 24.435Q25.477 24.651 25.272 24.810Q25.067 24.968 24.825 25.050Q24.583 25.132 24.325 25.132Q24.106 25.132 23.893 25.073Q23.680 25.015 23.485 24.894Q23.391 25.034 23.391 25.214Q23.391 25.421 23.528 25.573Q23.665 25.726 23.872 25.726L24.567 25.726Q25.055 25.726 25.467 25.810Q25.879 25.894 26.159 26.151Q26.438 26.409 26.438 26.901Q26.438 27.265 26.118 27.497Q25.797 27.730 25.356 27.831Q24.915 27.933 24.559 27.933Q24.204 27.933 23.760 27.831Q23.317 27.730 22.997 27.497Q22.676 27.265 22.676 26.901M23.180 26.901Q23.180 27.097 23.325 27.245Q23.469 27.394 23.682 27.483Q23.895 27.573 24.135 27.620Q24.376 27.667 24.559 27.667Q24.801 27.667 25.131 27.589Q25.462 27.511 25.698 27.337Q25.934 27.163 25.934 26.901Q25.934 26.495 25.524 26.386Q25.114 26.276 24.551 26.276L23.872 26.276Q23.602 26.276 23.391 26.454Q23.180 26.632 23.180 26.901M24.325 24.866Q25.047 24.866 25.047 23.948Q25.047 23.026 24.325 23.026Q23.598 23.026 23.598 23.948Q23.598 24.866 24.325 24.866M28.852 26.292L26.997 26.292L26.997 25.995Q27.270 25.995 27.438 25.948Q27.606 25.901 27.606 25.733L27.606 21.573Q27.606 21.358 27.544 21.263Q27.481 21.167 27.362 21.146Q27.243 21.124 26.997 21.124L26.997 20.827L28.219 20.741L28.219 23.444Q28.344 23.233 28.532 23.083Q28.719 22.933 28.946 22.849Q29.172 22.765 29.419 22.765Q30.587 22.765 30.587 23.843L30.587 25.733Q30.587 25.901 30.756 25.948Q30.926 25.995 31.196 25.995L31.196 26.292L29.340 26.292L29.340 25.995Q29.614 25.995 29.782 25.948Q29.950 25.901 29.950 25.733L29.950 23.858Q29.950 23.476 29.829 23.247Q29.708 23.019 29.356 23.019Q29.044 23.019 28.790 23.181Q28.536 23.343 28.389 23.612Q28.243 23.882 28.243 24.179L28.243 25.733Q28.243 25.901 28.413 25.948Q28.583 25.995 28.852 25.995\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(86.046 -83.358)\">\u003Cpath d=\"M32.040 25.331L32.040 23.140L31.337 23.140L31.337 22.886Q31.693 22.886 31.935 22.653Q32.177 22.421 32.288 22.073Q32.400 21.726 32.400 21.370L32.681 21.370L32.681 22.843L33.857 22.843L33.857 23.140L32.681 23.140L32.681 25.315Q32.681 25.636 32.800 25.864Q32.919 26.093 33.200 26.093Q33.380 26.093 33.497 25.970Q33.614 25.847 33.667 25.667Q33.720 25.487 33.720 25.315L33.720 24.843L34.001 24.843L34.001 25.331Q34.001 25.585 33.896 25.825Q33.790 26.065 33.593 26.218Q33.396 26.370 33.138 26.370Q32.822 26.370 32.570 26.247Q32.318 26.124 32.179 25.890Q32.040 25.655 32.040 25.331M34.720 24.538Q34.720 24.058 34.952 23.642Q35.185 23.226 35.595 22.976Q36.005 22.726 36.482 22.726Q37.212 22.726 37.611 23.167Q38.009 23.608 38.009 24.339Q38.009 24.444 37.915 24.468L35.466 24.468L35.466 24.538Q35.466 24.948 35.587 25.304Q35.708 25.659 35.980 25.876Q36.251 26.093 36.681 26.093Q37.044 26.093 37.341 25.864Q37.638 25.636 37.739 25.284Q37.747 25.237 37.833 25.222L37.915 25.222Q38.009 25.249 38.009 25.331Q38.009 25.339 38.001 25.370Q37.939 25.597 37.800 25.780Q37.661 25.964 37.470 26.097Q37.279 26.230 37.060 26.300Q36.841 26.370 36.603 26.370Q36.232 26.370 35.894 26.233Q35.556 26.097 35.288 25.845Q35.021 25.593 34.870 25.253Q34.720 24.913 34.720 24.538M35.474 24.230L37.435 24.230Q37.435 23.925 37.333 23.634Q37.232 23.343 37.015 23.161Q36.798 22.980 36.482 22.980Q36.181 22.980 35.950 23.167Q35.720 23.355 35.597 23.646Q35.474 23.937 35.474 24.230M38.540 26.284L38.540 25.062Q38.540 25.034 38.572 25.003Q38.603 24.972 38.626 24.972L38.732 24.972Q38.802 24.972 38.818 25.034Q38.880 25.355 39.019 25.595Q39.157 25.835 39.390 25.976Q39.622 26.116 39.931 26.116Q40.169 26.116 40.378 26.056Q40.587 25.995 40.724 25.847Q40.861 25.698 40.861 25.452Q40.861 25.198 40.650 25.032Q40.439 24.866 40.169 24.812L39.548 24.698Q39.142 24.620 38.841 24.364Q38.540 24.108 38.540 23.733Q38.540 23.366 38.741 23.144Q38.943 22.921 39.267 22.823Q39.591 22.726 39.931 22.726Q40.396 22.726 40.693 22.933L40.915 22.749Q40.939 22.726 40.970 22.726L41.021 22.726Q41.052 22.726 41.079 22.753Q41.107 22.780 41.107 22.812L41.107 23.796Q41.107 23.827 41.081 23.856Q41.056 23.886 41.021 23.886L40.915 23.886Q40.880 23.886 40.853 23.858Q40.825 23.831 40.825 23.796Q40.825 23.397 40.573 23.177Q40.322 22.956 39.923 22.956Q39.568 22.956 39.284 23.079Q39.001 23.202 39.001 23.507Q39.001 23.726 39.202 23.858Q39.404 23.991 39.650 24.034L40.275 24.147Q40.704 24.237 41.013 24.534Q41.322 24.831 41.322 25.245Q41.322 25.815 40.923 26.093Q40.525 26.370 39.931 26.370Q39.380 26.370 39.029 26.034L38.732 26.347Q38.708 26.370 38.673 26.370L38.626 26.370Q38.603 26.370 38.572 26.339Q38.540 26.308 38.540 26.284M42.474 25.331L42.474 23.140L41.771 23.140L41.771 22.886Q42.126 22.886 42.368 22.653Q42.611 22.421 42.722 22.073Q42.833 21.726 42.833 21.370L43.114 21.370L43.114 22.843L44.290 22.843L44.290 23.140L43.114 23.140L43.114 25.315Q43.114 25.636 43.234 25.864Q43.353 26.093 43.634 26.093Q43.814 26.093 43.931 25.970Q44.048 25.847 44.101 25.667Q44.154 25.487 44.154 25.315L44.154 24.843L44.435 24.843L44.435 25.331Q44.435 25.585 44.329 25.825Q44.224 26.065 44.027 26.218Q43.829 26.370 43.572 26.370Q43.255 26.370 43.003 26.247Q42.751 26.124 42.613 25.890Q42.474 25.655 42.474 25.331\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cg stroke=\"none\" font-family=\"cmr8\" font-size=\"8\">\u003Cg transform=\"translate(86.046 19.85)\">\u003Cpath d=\"M-4.789 26.292L-5.070 26.292L-5.070 21.573Q-5.070 21.358-5.132 21.263Q-5.195 21.167-5.312 21.146Q-5.429 21.124-5.675 21.124L-5.675 20.827L-4.453 20.741L-4.453 23.230Q-3.976 22.765-3.277 22.765Q-2.796 22.765-2.388 23.009Q-1.980 23.253-1.744 23.667Q-1.507 24.081-1.507 24.565Q-1.507 24.940-1.656 25.269Q-1.804 25.597-2.074 25.849Q-2.343 26.101-2.687 26.235Q-3.031 26.370-3.390 26.370Q-3.711 26.370-4.009 26.222Q-4.308 26.073-4.515 25.812L-4.789 26.292M-4.429 23.620L-4.429 25.460Q-4.277 25.757-4.017 25.937Q-3.757 26.116-3.445 26.116Q-3.019 26.116-2.752 25.897Q-2.484 25.679-2.369 25.333Q-2.253 24.987-2.253 24.565Q-2.253 23.917-2.502 23.468Q-2.750 23.019-3.347 23.019Q-3.683 23.019-3.972 23.177Q-4.261 23.335-4.429 23.620M0.875 26.292L-0.902 26.292L-0.902 25.995Q-0.628 25.995-0.461 25.948Q-0.293 25.901-0.293 25.733L-0.293 23.597Q-0.293 23.382-0.349 23.286Q-0.406 23.190-0.519 23.169Q-0.632 23.147-0.878 23.147L-0.878 22.851L0.321 22.765L0.321 25.733Q0.321 25.901 0.467 25.948Q0.614 25.995 0.875 25.995L0.875 26.292M-0.566 21.370Q-0.566 21.179-0.431 21.048Q-0.296 20.917-0.101 20.917Q0.020 20.917 0.123 20.980Q0.227 21.042 0.289 21.146Q0.352 21.249 0.352 21.370Q0.352 21.565 0.221 21.700Q0.090 21.835-0.101 21.835Q-0.300 21.835-0.433 21.702Q-0.566 21.569-0.566 21.370M3.305 26.292L1.450 26.292L1.450 25.995Q1.723 25.995 1.891 25.948Q2.059 25.901 2.059 25.733L2.059 23.597Q2.059 23.382 1.997 23.286Q1.934 23.190 1.815 23.169Q1.696 23.147 1.450 23.147L1.450 22.851L2.641 22.765L2.641 23.499Q2.754 23.284 2.948 23.116Q3.141 22.948 3.379 22.856Q3.618 22.765 3.872 22.765Q5.039 22.765 5.039 23.843L5.039 25.733Q5.039 25.901 5.209 25.948Q5.379 25.995 5.649 25.995L5.649 26.292L3.793 26.292L3.793 25.995Q4.067 25.995 4.235 25.948Q4.403 25.901 4.403 25.733L4.403 23.858Q4.403 23.476 4.282 23.247Q4.161 23.019 3.809 23.019Q3.497 23.019 3.243 23.181Q2.989 23.343 2.842 23.612Q2.696 23.882 2.696 24.179L2.696 25.733Q2.696 25.901 2.866 25.948Q3.036 25.995 3.305 25.995L3.305 26.292M7.911 26.370Q7.430 26.370 7.022 26.126Q6.614 25.882 6.375 25.468Q6.137 25.054 6.137 24.565Q6.137 24.073 6.395 23.657Q6.653 23.241 7.084 23.003Q7.516 22.765 8.008 22.765Q8.629 22.765 9.079 23.202L9.079 21.573Q9.079 21.358 9.016 21.263Q8.954 21.167 8.836 21.146Q8.719 21.124 8.473 21.124L8.473 20.827L9.696 20.741L9.696 25.550Q9.696 25.761 9.758 25.856Q9.821 25.952 9.938 25.974Q10.055 25.995 10.305 25.995L10.305 26.292L9.055 26.370L9.055 25.886Q8.590 26.370 7.911 26.370M7.977 26.116Q8.317 26.116 8.610 25.925Q8.903 25.733 9.055 25.437L9.055 23.605Q8.907 23.331 8.645 23.175Q8.383 23.019 8.071 23.019Q7.446 23.019 7.163 23.466Q6.879 23.913 6.879 24.573Q6.879 25.218 7.131 25.667Q7.383 26.116 7.977 26.116M10.856 26.284L10.856 25.062Q10.856 25.034 10.887 25.003Q10.918 24.972 10.942 24.972L11.047 24.972Q11.118 24.972 11.133 25.034Q11.196 25.355 11.334 25.595Q11.473 25.835 11.705 25.976Q11.938 26.116 12.247 26.116Q12.485 26.116 12.694 26.056Q12.903 25.995 13.039 25.847Q13.176 25.698 13.176 25.452Q13.176 25.198 12.965 25.032Q12.754 24.866 12.485 24.812L11.864 24.698Q11.457 24.620 11.157 24.364Q10.856 24.108 10.856 23.733Q10.856 23.366 11.057 23.144Q11.258 22.921 11.582 22.823Q11.907 22.726 12.247 22.726Q12.711 22.726 13.008 22.933L13.231 22.749Q13.254 22.726 13.286 22.726L13.336 22.726Q13.368 22.726 13.395 22.753Q13.422 22.780 13.422 22.812L13.422 23.796Q13.422 23.827 13.397 23.856Q13.372 23.886 13.336 23.886L13.231 23.886Q13.196 23.886 13.168 23.858Q13.141 23.831 13.141 23.796Q13.141 23.397 12.889 23.177Q12.637 22.956 12.239 22.956Q11.883 22.956 11.600 23.079Q11.317 23.202 11.317 23.507Q11.317 23.726 11.518 23.858Q11.719 23.991 11.965 24.034L12.590 24.147Q13.020 24.237 13.329 24.534Q13.637 24.831 13.637 25.245Q13.637 25.815 13.239 26.093Q12.840 26.370 12.247 26.370Q11.696 26.370 11.344 26.034L11.047 26.347Q11.024 26.370 10.989 26.370L10.942 26.370Q10.918 26.370 10.887 26.339Q10.856 26.308 10.856 26.284\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(86.046 19.85)\">\u003Cpath d=\"M18.926 26.292L17.094 26.292L17.094 25.995Q17.368 25.995 17.536 25.948Q17.704 25.901 17.704 25.733L17.704 21.573Q17.704 21.358 17.641 21.263Q17.579 21.167 17.460 21.146Q17.340 21.124 17.094 21.124L17.094 20.827L18.317 20.741L18.317 25.733Q18.317 25.901 18.485 25.948Q18.653 25.995 18.926 25.995L18.926 26.292M19.372 24.597Q19.372 24.093 19.628 23.661Q19.883 23.230 20.319 22.978Q20.754 22.726 21.254 22.726Q21.641 22.726 21.983 22.870Q22.325 23.015 22.587 23.276Q22.848 23.538 22.991 23.874Q23.133 24.210 23.133 24.597Q23.133 25.089 22.870 25.499Q22.606 25.909 22.176 26.140Q21.747 26.370 21.254 26.370Q20.762 26.370 20.329 26.138Q19.895 25.905 19.633 25.497Q19.372 25.089 19.372 24.597M21.254 26.093Q21.712 26.093 21.963 25.870Q22.215 25.647 22.303 25.296Q22.391 24.944 22.391 24.499Q22.391 24.069 22.297 23.731Q22.204 23.394 21.950 23.187Q21.696 22.980 21.254 22.980Q20.606 22.980 20.362 23.396Q20.118 23.812 20.118 24.499Q20.118 24.944 20.206 25.296Q20.294 25.647 20.545 25.870Q20.797 26.093 21.254 26.093\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(86.046 19.85)\">\u003Cpath d=\"M23.859 24.597Q23.859 24.093 24.115 23.661Q24.371 23.230 24.807 22.978Q25.242 22.726 25.742 22.726Q26.129 22.726 26.471 22.870Q26.812 23.015 27.074 23.276Q27.336 23.538 27.478 23.874Q27.621 24.210 27.621 24.597Q27.621 25.089 27.357 25.499Q27.094 25.909 26.664 26.140Q26.234 26.370 25.742 26.370Q25.250 26.370 24.816 26.138Q24.383 25.905 24.121 25.497Q23.859 25.089 23.859 24.597M25.742 26.093Q26.199 26.093 26.451 25.870Q26.703 25.647 26.791 25.296Q26.879 24.944 26.879 24.499Q26.879 24.069 26.785 23.731Q26.691 23.394 26.437 23.187Q26.183 22.980 25.742 22.980Q25.094 22.980 24.850 23.396Q24.605 23.812 24.605 24.499Q24.605 24.944 24.693 25.296Q24.781 25.647 25.033 25.870Q25.285 26.093 25.742 26.093M28.148 26.284L28.148 25.062Q28.148 25.034 28.180 25.003Q28.211 24.972 28.234 24.972L28.340 24.972Q28.410 24.972 28.426 25.034Q28.488 25.355 28.627 25.595Q28.766 25.835 28.998 25.976Q29.230 26.116 29.539 26.116Q29.777 26.116 29.986 26.056Q30.195 25.995 30.332 25.847Q30.469 25.698 30.469 25.452Q30.469 25.198 30.258 25.032Q30.047 24.866 29.777 24.812L29.156 24.698Q28.750 24.620 28.449 24.364Q28.148 24.108 28.148 23.733Q28.148 23.366 28.350 23.144Q28.551 22.921 28.875 22.823Q29.199 22.726 29.539 22.726Q30.004 22.726 30.301 22.933L30.523 22.749Q30.547 22.726 30.578 22.726L30.629 22.726Q30.660 22.726 30.687 22.753Q30.715 22.780 30.715 22.812L30.715 23.796Q30.715 23.827 30.689 23.856Q30.664 23.886 30.629 23.886L30.523 23.886Q30.488 23.886 30.461 23.858Q30.433 23.831 30.433 23.796Q30.433 23.397 30.182 23.177Q29.930 22.956 29.531 22.956Q29.176 22.956 28.892 23.079Q28.609 23.202 28.609 23.507Q28.609 23.726 28.810 23.858Q29.012 23.991 29.258 24.034L29.883 24.147Q30.312 24.237 30.621 24.534Q30.930 24.831 30.930 25.245Q30.930 25.815 30.531 26.093Q30.133 26.370 29.539 26.370Q28.988 26.370 28.637 26.034L28.340 26.347Q28.316 26.370 28.281 26.370L28.234 26.370Q28.211 26.370 28.180 26.339Q28.148 26.308 28.148 26.284M31.457 24.538Q31.457 24.058 31.689 23.642Q31.922 23.226 32.332 22.976Q32.742 22.726 33.219 22.726Q33.949 22.726 34.348 23.167Q34.746 23.608 34.746 24.339Q34.746 24.444 34.652 24.468L32.203 24.468L32.203 24.538Q32.203 24.948 32.324 25.304Q32.445 25.659 32.717 25.876Q32.988 26.093 33.418 26.093Q33.781 26.093 34.078 25.864Q34.375 25.636 34.476 25.284Q34.484 25.237 34.570 25.222L34.652 25.222Q34.746 25.249 34.746 25.331Q34.746 25.339 34.738 25.370Q34.676 25.597 34.537 25.780Q34.398 25.964 34.207 26.097Q34.016 26.230 33.797 26.300Q33.578 26.370 33.340 26.370Q32.969 26.370 32.631 26.233Q32.293 26.097 32.025 25.845Q31.758 25.593 31.607 25.253Q31.457 24.913 31.457 24.538M32.211 24.230L34.172 24.230Q34.172 23.925 34.070 23.634Q33.969 23.343 33.752 23.161Q33.535 22.980 33.219 22.980Q32.918 22.980 32.687 23.167Q32.457 23.355 32.334 23.646Q32.211 23.937 32.211 24.230M35.277 26.284L35.277 25.062Q35.277 25.034 35.308 25.003Q35.340 24.972 35.363 24.972L35.469 24.972Q35.539 24.972 35.555 25.034Q35.617 25.355 35.756 25.595Q35.894 25.835 36.127 25.976Q36.359 26.116 36.668 26.116Q36.906 26.116 37.115 26.056Q37.324 25.995 37.461 25.847Q37.598 25.698 37.598 25.452Q37.598 25.198 37.387 25.032Q37.176 24.866 36.906 24.812L36.285 24.698Q35.879 24.620 35.578 24.364Q35.277 24.108 35.277 23.733Q35.277 23.366 35.478 23.144Q35.680 22.921 36.004 22.823Q36.328 22.726 36.668 22.726Q37.133 22.726 37.430 22.933L37.652 22.749Q37.676 22.726 37.707 22.726L37.758 22.726Q37.789 22.726 37.816 22.753Q37.844 22.780 37.844 22.812L37.844 23.796Q37.844 23.827 37.818 23.856Q37.793 23.886 37.758 23.886L37.652 23.886Q37.617 23.886 37.590 23.858Q37.562 23.831 37.562 23.796Q37.562 23.397 37.310 23.177Q37.058 22.956 36.660 22.956Q36.305 22.956 36.021 23.079Q35.738 23.202 35.738 23.507Q35.738 23.726 35.939 23.858Q36.141 23.991 36.387 24.034L37.012 24.147Q37.441 24.237 37.750 24.534Q38.058 24.831 38.058 25.245Q38.058 25.815 37.660 26.093Q37.262 26.370 36.668 26.370Q36.117 26.370 35.766 26.034L35.469 26.347Q35.445 26.370 35.410 26.370L35.363 26.370Q35.340 26.370 35.308 26.339Q35.277 26.308 35.277 26.284M39.211 25.331L39.211 23.140L38.508 23.140L38.508 22.886Q38.863 22.886 39.105 22.653Q39.348 22.421 39.459 22.073Q39.570 21.726 39.570 21.370L39.851 21.370L39.851 22.843L41.027 22.843L41.027 23.140L39.851 23.140L39.851 25.315Q39.851 25.636 39.971 25.864Q40.090 26.093 40.371 26.093Q40.551 26.093 40.668 25.970Q40.785 25.847 40.838 25.667Q40.891 25.487 40.891 25.315L40.891 24.843L41.172 24.843L41.172 25.331Q41.172 25.585 41.066 25.825Q40.961 26.065 40.764 26.218Q40.566 26.370 40.308 26.370Q39.992 26.370 39.740 26.247Q39.488 26.124 39.350 25.890Q39.211 25.655 39.211 25.331\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003C\u002Fg>\u003C\u002Fsvg>\u003Cfigcaption class=\"tikz-cap\">The regular-expression operator precedence hierarchy: parentheses bind tightest, then counters, then sequences and anchors, and disjunction loosest — the order that resolves an otherwise ambiguous pattern.\u003C\u002Ffigcaption>","\u003Csvg style=\"width:100%;max-width:331.915px;height:auto\" xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" viewBox=\"-75 -75 248.936 120.611\">\u003Cg stroke=\"currentColor\" style=\"stroke-miterlimit:10;stroke-width:.4\">\u003Cpath fill=\"none\" d=\"M-68.737-49.108h85.359V-71.87h-85.359Z\"\u002F>\u003Cg stroke=\"none\" font-size=\"8\">\u003Cg transform=\"translate(-24.91 -89.049)\">\u003Cpath d=\"M-22.546 29.072L-24.988 29.072Q-24.933 29.349-24.736 29.572Q-24.538 29.794-24.261 29.917Q-23.984 30.040-23.699 30.040Q-23.226 30.040-23.003 29.751Q-22.995 29.740-22.939 29.634Q-22.882 29.529-22.833 29.486Q-22.785 29.443-22.691 29.431L-22.546 29.431Q-22.355 29.451-22.296 29.665L-22.296 29.720Q-22.363 30.021-22.593 30.218Q-22.824 30.415-23.136 30.507Q-23.449 30.599-23.753 30.599Q-24.238 30.599-24.677 30.371Q-25.117 30.142-25.384 29.742Q-25.652 29.341-25.652 28.849L-25.652 28.790Q-25.652 28.322-25.406 27.919Q-25.160 27.517-24.751 27.283Q-24.343 27.048-23.874 27.048Q-23.370 27.048-23.017 27.271Q-22.663 27.494-22.480 27.882Q-22.296 28.271-22.296 28.775L-22.296 28.833Q-22.355 29.048-22.546 29.072M-24.980 28.521L-22.953 28.521Q-22.999 28.111-23.238 27.859Q-23.476 27.607-23.874 27.607Q-24.269 27.607-24.576 27.869Q-24.882 28.130-24.980 28.521\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-24.91 -89.049)\">\u003Cpath d=\"M-17.334 30.322L-17.334 30.232Q-17.276 30.025-17.084 30.001L-16.373 30.001L-16.373 27.673L-17.084 27.673Q-17.280 27.650-17.334 27.431L-17.334 27.345Q-17.276 27.134-17.084 27.111L-15.983 27.111Q-15.784 27.130-15.733 27.345L-15.733 27.673Q-15.471 27.388-15.116 27.230Q-14.760 27.072-14.373 27.072Q-14.080 27.072-13.846 27.206Q-13.612 27.341-13.612 27.607Q-13.612 27.775-13.721 27.892Q-13.830 28.009-13.998 28.009Q-14.151 28.009-14.266 27.898Q-14.381 27.787-14.381 27.630Q-14.756 27.630-15.071 27.831Q-15.385 28.033-15.559 28.367Q-15.733 28.701-15.733 29.080L-15.733 30.001L-14.787 30.001Q-14.580 30.025-14.541 30.232L-14.541 30.322Q-14.580 30.537-14.787 30.560L-17.084 30.560Q-17.276 30.537-17.334 30.322\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-24.91 -89.049)\">\u003Cpath d=\"M-7.857 32.552Q-8.470 32.095-8.872 31.460Q-9.275 30.826-9.470 30.080Q-9.665 29.333-9.665 28.560Q-9.665 27.787-9.470 27.040Q-9.275 26.294-8.872 25.660Q-8.470 25.025-7.857 24.568Q-7.845 24.564-7.837 24.562Q-7.829 24.560-7.818 24.560L-7.740 24.560Q-7.701 24.560-7.675 24.587Q-7.650 24.615-7.650 24.658Q-7.650 24.708-7.681 24.728Q-8.189 25.181-8.511 25.804Q-8.833 26.427-8.974 27.122Q-9.115 27.818-9.115 28.560Q-9.115 29.294-8.976 29.994Q-8.837 30.693-8.513 31.318Q-8.189 31.943-7.681 32.392Q-7.650 32.412-7.650 32.462Q-7.650 32.505-7.675 32.533Q-7.701 32.560-7.740 32.560L-7.818 32.560Q-7.826 32.556-7.835 32.554Q-7.845 32.552-7.857 32.552M-6.888 28.833Q-6.888 28.337-6.638 27.912Q-6.388 27.486-5.968 27.240Q-5.548 26.994-5.048 26.994Q-4.509 26.994-4.119 27.119Q-3.728 27.244-3.728 27.658Q-3.728 27.763-3.779 27.855Q-3.829 27.947-3.921 27.997Q-4.013 28.048-4.122 28.048Q-4.228 28.048-4.320 27.997Q-4.412 27.947-4.462 27.855Q-4.513 27.763-4.513 27.658Q-4.513 27.435-4.345 27.330Q-4.568 27.271-5.040 27.271Q-5.337 27.271-5.552 27.410Q-5.767 27.548-5.898 27.779Q-6.029 28.009-6.087 28.279Q-6.146 28.548-6.146 28.833Q-6.146 29.228-6.013 29.578Q-5.880 29.927-5.609 30.144Q-5.337 30.361-4.939 30.361Q-4.564 30.361-4.288 30.144Q-4.013 29.927-3.912 29.568Q-3.896 29.505-3.833 29.505L-3.728 29.505Q-3.693 29.505-3.667 29.533Q-3.642 29.560-3.642 29.599L-3.642 29.622Q-3.775 30.103-4.160 30.371Q-4.544 30.638-5.048 30.638Q-5.412 30.638-5.745 30.501Q-6.079 30.365-6.339 30.115Q-6.599 29.865-6.744 29.529Q-6.888 29.193-6.888 28.833M-3.154 28.865Q-3.154 28.361-2.898 27.929Q-2.642 27.497-2.206 27.246Q-1.771 26.994-1.271 26.994Q-0.884 26.994-0.542 27.138Q-0.201 27.283 0.061 27.544Q0.323 27.806 0.465 28.142Q0.608 28.478 0.608 28.865Q0.608 29.357 0.344 29.767Q0.081 30.177-0.349 30.408Q-0.779 30.638-1.271 30.638Q-1.763 30.638-2.197 30.406Q-2.630 30.173-2.892 29.765Q-3.154 29.357-3.154 28.865M-1.271 30.361Q-0.814 30.361-0.562 30.138Q-0.310 29.915-0.222 29.564Q-0.134 29.212-0.134 28.767Q-0.134 28.337-0.228 27.999Q-0.322 27.662-0.576 27.455Q-0.829 27.247-1.271 27.247Q-1.919 27.247-2.163 27.664Q-2.408 28.080-2.408 28.767Q-2.408 29.212-2.320 29.564Q-2.232 29.915-1.980 30.138Q-1.728 30.361-1.271 30.361M1.776 29.607L1.776 27.865Q1.776 27.650 1.713 27.554Q1.651 27.458 1.532 27.437Q1.413 27.415 1.167 27.415L1.167 27.119L2.413 27.033L2.413 29.583L2.413 29.607Q2.413 29.919 2.467 30.081Q2.522 30.244 2.672 30.314Q2.823 30.384 3.143 30.384Q3.573 30.384 3.846 30.046Q4.120 29.708 4.120 29.263L4.120 27.865Q4.120 27.650 4.057 27.554Q3.995 27.458 3.876 27.437Q3.756 27.415 3.510 27.415L3.510 27.119L4.756 27.033L4.756 29.818Q4.756 30.029 4.819 30.124Q4.881 30.220 5.001 30.242Q5.120 30.263 5.366 30.263L5.366 30.560L4.143 30.638L4.143 30.017Q3.975 30.306 3.694 30.472Q3.413 30.638 3.092 30.638Q1.776 30.638 1.776 29.607M7.741 30.560L5.885 30.560L5.885 30.263Q6.159 30.263 6.327 30.216Q6.495 30.169 6.495 30.001L6.495 27.865Q6.495 27.650 6.432 27.554Q6.370 27.458 6.251 27.437Q6.131 27.415 5.885 27.415L5.885 27.119L7.077 27.033L7.077 27.767Q7.190 27.552 7.383 27.384Q7.577 27.216 7.815 27.124Q8.053 27.033 8.307 27.033Q9.475 27.033 9.475 28.111L9.475 30.001Q9.475 30.169 9.645 30.216Q9.815 30.263 10.085 30.263L10.085 30.560L8.229 30.560L8.229 30.263Q8.503 30.263 8.671 30.216Q8.838 30.169 8.838 30.001L8.838 28.126Q8.838 27.744 8.717 27.515Q8.596 27.287 8.245 27.287Q7.932 27.287 7.678 27.449Q7.424 27.611 7.278 27.880Q7.131 28.150 7.131 28.447L7.131 30.001Q7.131 30.169 7.301 30.216Q7.471 30.263 7.741 30.263\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-24.91 -89.049)\">\u003Cpath d=\"M10.931 29.599L10.931 27.408L10.228 27.408L10.228 27.154Q10.584 27.154 10.826 26.921Q11.068 26.689 11.179 26.341Q11.291 25.994 11.291 25.638L11.572 25.638L11.572 27.111L12.748 27.111L12.748 27.408L11.572 27.408L11.572 29.583Q11.572 29.904 11.691 30.132Q11.810 30.361 12.091 30.361Q12.271 30.361 12.388 30.238Q12.505 30.115 12.558 29.935Q12.611 29.755 12.611 29.583L12.611 29.111L12.892 29.111L12.892 29.599Q12.892 29.853 12.787 30.093Q12.681 30.333 12.484 30.486Q12.287 30.638 12.029 30.638Q11.713 30.638 11.461 30.515Q11.209 30.392 11.070 30.158Q10.931 29.923 10.931 29.599\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-24.91 -89.049)\">\u003Cpath d=\"M17.199 30.216Q17.430 30.455 17.977 30.455Q18.230 30.455 18.453 30.331Q18.676 30.208 18.846 29.992Q19.016 29.775 19.109 29.544Q19.234 29.232 19.273 28.892Q19.312 28.552 19.312 28.103Q19.145 28.435 18.861 28.630Q18.578 28.826 18.238 28.826Q17.875 28.826 17.562 28.681Q17.250 28.537 17.027 28.285Q16.805 28.033 16.682 27.706Q16.559 27.380 16.559 27.025Q16.559 26.529 16.801 26.119Q17.043 25.708 17.461 25.474Q17.879 25.240 18.375 25.240Q19.332 25.240 19.713 26.070Q20.094 26.900 20.094 27.974Q20.094 28.607 19.844 29.251Q19.594 29.896 19.111 30.312Q18.629 30.728 17.977 30.728Q17.473 30.728 17.123 30.511Q16.773 30.294 16.773 29.826Q16.773 29.658 16.887 29.544Q17 29.431 17.168 29.431Q17.273 29.431 17.365 29.482Q17.457 29.533 17.508 29.624Q17.559 29.716 17.559 29.826Q17.559 29.974 17.457 30.095Q17.355 30.216 17.199 30.216M18.277 28.568Q18.609 28.568 18.842 28.357Q19.074 28.146 19.186 27.824Q19.297 27.501 19.297 27.185Q19.297 27.087 19.285 27.033Q19.289 27.025 19.293 27.013Q19.297 27.001 19.297 26.994Q19.297 26.751 19.254 26.488Q19.211 26.224 19.109 25.996Q19.008 25.767 18.826 25.624Q18.645 25.482 18.375 25.482Q17.941 25.482 17.715 25.703Q17.488 25.923 17.416 26.255Q17.344 26.587 17.344 27.025Q17.344 27.470 17.400 27.792Q17.457 28.115 17.662 28.341Q17.867 28.568 18.277 28.568M21.094 32.560L21.012 32.560Q20.977 32.560 20.951 32.531Q20.926 32.501 20.926 32.462Q20.926 32.412 20.957 32.392Q21.344 32.056 21.627 31.607Q21.910 31.158 22.076 30.658Q22.242 30.158 22.316 29.640Q22.391 29.122 22.391 28.560Q22.391 27.990 22.316 27.474Q22.242 26.958 22.076 26.462Q21.910 25.966 21.631 25.519Q21.352 25.072 20.957 24.728Q20.926 24.708 20.926 24.658Q20.926 24.619 20.951 24.589Q20.977 24.560 21.012 24.560L21.094 24.560Q21.105 24.560 21.115 24.562Q21.125 24.564 21.133 24.568Q21.746 25.025 22.148 25.660Q22.551 26.294 22.746 27.040Q22.941 27.787 22.941 28.560Q22.941 29.333 22.746 30.080Q22.551 30.826 22.148 31.460Q21.746 32.095 21.133 32.552Q21.121 32.552 21.113 32.554Q21.105 32.556 21.094 32.560\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cpath fill=\"none\" d=\"M-68.737-3.584h85.359v-22.762h-85.359Z\"\u002F>\u003Cg stroke=\"none\">\u003Cg transform=\"translate(-26.44 -43.525)\">\u003Cpath d=\"M-22.546 29.072L-24.988 29.072Q-24.933 29.349-24.736 29.572Q-24.538 29.794-24.261 29.917Q-23.984 30.040-23.699 30.040Q-23.226 30.040-23.003 29.751Q-22.995 29.740-22.939 29.634Q-22.882 29.529-22.833 29.486Q-22.785 29.443-22.691 29.431L-22.546 29.431Q-22.355 29.451-22.296 29.665L-22.296 29.720Q-22.363 30.021-22.593 30.218Q-22.824 30.415-23.136 30.507Q-23.449 30.599-23.753 30.599Q-24.238 30.599-24.677 30.371Q-25.117 30.142-25.384 29.742Q-25.652 29.341-25.652 28.849L-25.652 28.790Q-25.652 28.322-25.406 27.919Q-25.160 27.517-24.751 27.283Q-24.343 27.048-23.874 27.048Q-23.370 27.048-23.017 27.271Q-22.663 27.494-22.480 27.882Q-22.296 28.271-22.296 28.775L-22.296 28.833Q-22.355 29.048-22.546 29.072M-24.980 28.521L-22.953 28.521Q-22.999 28.111-23.238 27.859Q-23.476 27.607-23.874 27.607Q-24.269 27.607-24.576 27.869Q-24.882 28.130-24.980 28.521M-21.589 30.322L-21.589 30.232Q-21.531 30.025-21.339 30.001L-20.628 30.001L-20.628 27.673L-21.339 27.673Q-21.535 27.650-21.589 27.431L-21.589 27.345Q-21.531 27.134-21.339 27.111L-20.238 27.111Q-20.038 27.130-19.988 27.345L-19.988 27.673Q-19.726 27.388-19.370 27.230Q-19.015 27.072-18.628 27.072Q-18.335 27.072-18.101 27.206Q-17.867 27.341-17.867 27.607Q-17.867 27.775-17.976 27.892Q-18.085 28.009-18.253 28.009Q-18.406 28.009-18.521 27.898Q-18.636 27.787-18.636 27.630Q-19.011 27.630-19.326 27.831Q-19.640 28.033-19.814 28.367Q-19.988 28.701-19.988 29.080L-19.988 30.001L-19.042 30.001Q-18.835 30.025-18.796 30.232L-18.796 30.322Q-18.835 30.537-19.042 30.560L-21.339 30.560Q-21.531 30.537-21.589 30.322\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cpath d=\"M-39.237-13.365h2.55v.4h-2.55z\"\u002F>\u003Cg transform=\"translate(-26.44 -43.525)\">\u003Cpath d=\"M-4.797 32.552Q-5.410 32.095-5.812 31.460Q-6.215 30.826-6.410 30.080Q-6.605 29.333-6.605 28.560Q-6.605 27.787-6.410 27.040Q-6.215 26.294-5.812 25.660Q-5.410 25.025-4.797 24.568Q-4.785 24.564-4.777 24.562Q-4.769 24.560-4.758 24.560L-4.680 24.560Q-4.641 24.560-4.615 24.587Q-4.590 24.615-4.590 24.658Q-4.590 24.708-4.621 24.728Q-5.129 25.181-5.451 25.804Q-5.773 26.427-5.914 27.122Q-6.055 27.818-6.055 28.560Q-6.055 29.294-5.916 29.994Q-5.777 30.693-5.453 31.318Q-5.129 31.943-4.621 32.392Q-4.590 32.412-4.590 32.462Q-4.590 32.505-4.615 32.533Q-4.641 32.560-4.680 32.560L-4.758 32.560Q-4.766 32.556-4.775 32.554Q-4.785 32.552-4.797 32.552M-3.828 28.833Q-3.828 28.337-3.578 27.912Q-3.328 27.486-2.908 27.240Q-2.488 26.994-1.988 26.994Q-1.449 26.994-1.059 27.119Q-0.668 27.244-0.668 27.658Q-0.668 27.763-0.719 27.855Q-0.769 27.947-0.861 27.997Q-0.953 28.048-1.062 28.048Q-1.168 28.048-1.260 27.997Q-1.351 27.947-1.402 27.855Q-1.453 27.763-1.453 27.658Q-1.453 27.435-1.285 27.330Q-1.508 27.271-1.980 27.271Q-2.277 27.271-2.492 27.410Q-2.707 27.548-2.838 27.779Q-2.969 28.009-3.027 28.279Q-3.086 28.548-3.086 28.833Q-3.086 29.228-2.953 29.578Q-2.820 29.927-2.549 30.144Q-2.277 30.361-1.879 30.361Q-1.504 30.361-1.228 30.144Q-0.953 29.927-0.851 29.568Q-0.836 29.505-0.773 29.505L-0.668 29.505Q-0.633 29.505-0.607 29.533Q-0.582 29.560-0.582 29.599L-0.582 29.622Q-0.715 30.103-1.100 30.371Q-1.484 30.638-1.988 30.638Q-2.351 30.638-2.685 30.501Q-3.019 30.365-3.279 30.115Q-3.539 29.865-3.684 29.529Q-3.828 29.193-3.828 28.833M-0.094 28.865Q-0.094 28.361 0.162 27.929Q0.418 27.497 0.854 27.246Q1.289 26.994 1.789 26.994Q2.176 26.994 2.518 27.138Q2.859 27.283 3.121 27.544Q3.383 27.806 3.525 28.142Q3.668 28.478 3.668 28.865Q3.668 29.357 3.404 29.767Q3.141 30.177 2.711 30.408Q2.281 30.638 1.789 30.638Q1.297 30.638 0.863 30.406Q0.430 30.173 0.168 29.765Q-0.094 29.357-0.094 28.865M1.789 30.361Q2.246 30.361 2.498 30.138Q2.750 29.915 2.838 29.564Q2.926 29.212 2.926 28.767Q2.926 28.337 2.832 27.999Q2.738 27.662 2.484 27.455Q2.231 27.247 1.789 27.247Q1.141 27.247 0.897 27.664Q0.652 28.080 0.652 28.767Q0.652 29.212 0.740 29.564Q0.828 29.915 1.080 30.138Q1.332 30.361 1.789 30.361M4.836 29.607L4.836 27.865Q4.836 27.650 4.774 27.554Q4.711 27.458 4.592 27.437Q4.473 27.415 4.227 27.415L4.227 27.119L5.473 27.033L5.473 29.583L5.473 29.607Q5.473 29.919 5.527 30.081Q5.582 30.244 5.732 30.314Q5.883 30.384 6.203 30.384Q6.633 30.384 6.906 30.046Q7.180 29.708 7.180 29.263L7.180 27.865Q7.180 27.650 7.117 27.554Q7.055 27.458 6.936 27.437Q6.816 27.415 6.570 27.415L6.570 27.119L7.816 27.033L7.816 29.818Q7.816 30.029 7.879 30.124Q7.941 30.220 8.061 30.242Q8.180 30.263 8.426 30.263L8.426 30.560L7.203 30.638L7.203 30.017Q7.035 30.306 6.754 30.472Q6.473 30.638 6.152 30.638Q4.836 30.638 4.836 29.607M10.801 30.560L8.945 30.560L8.945 30.263Q9.219 30.263 9.387 30.216Q9.555 30.169 9.555 30.001L9.555 27.865Q9.555 27.650 9.492 27.554Q9.430 27.458 9.311 27.437Q9.191 27.415 8.945 27.415L8.945 27.119L10.137 27.033L10.137 27.767Q10.250 27.552 10.443 27.384Q10.637 27.216 10.875 27.124Q11.113 27.033 11.367 27.033Q12.535 27.033 12.535 28.111L12.535 30.001Q12.535 30.169 12.705 30.216Q12.875 30.263 13.145 30.263L13.145 30.560L11.289 30.560L11.289 30.263Q11.563 30.263 11.731 30.216Q11.899 30.169 11.899 30.001L11.899 28.126Q11.899 27.744 11.777 27.515Q11.656 27.287 11.305 27.287Q10.992 27.287 10.738 27.449Q10.484 27.611 10.338 27.880Q10.191 28.150 10.191 28.447L10.191 30.001Q10.191 30.169 10.361 30.216Q10.531 30.263 10.801 30.263\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-26.44 -43.525)\">\u003Cpath d=\"M13.991 29.599L13.991 27.408L13.288 27.408L13.288 27.154Q13.644 27.154 13.886 26.921Q14.128 26.689 14.239 26.341Q14.351 25.994 14.351 25.638L14.632 25.638L14.632 27.111L15.808 27.111L15.808 27.408L14.632 27.408L14.632 29.583Q14.632 29.904 14.751 30.132Q14.870 30.361 15.151 30.361Q15.331 30.361 15.448 30.238Q15.566 30.115 15.618 29.935Q15.671 29.755 15.671 29.583L15.671 29.111L15.952 29.111L15.952 29.599Q15.952 29.853 15.847 30.093Q15.741 30.333 15.544 30.486Q15.347 30.638 15.089 30.638Q14.773 30.638 14.521 30.515Q14.269 30.392 14.130 30.158Q13.991 29.923 13.991 29.599\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-26.44 -43.525)\">\u003Cpath d=\"M20.259 30.216Q20.490 30.455 21.037 30.455Q21.290 30.455 21.513 30.331Q21.736 30.208 21.906 29.992Q22.076 29.775 22.169 29.544Q22.294 29.232 22.333 28.892Q22.372 28.552 22.372 28.103Q22.204 28.435 21.921 28.630Q21.638 28.826 21.298 28.826Q20.935 28.826 20.622 28.681Q20.310 28.537 20.087 28.285Q19.865 28.033 19.742 27.706Q19.619 27.380 19.619 27.025Q19.619 26.529 19.861 26.119Q20.103 25.708 20.521 25.474Q20.939 25.240 21.435 25.240Q22.392 25.240 22.773 26.070Q23.154 26.900 23.154 27.974Q23.154 28.607 22.904 29.251Q22.654 29.896 22.171 30.312Q21.689 30.728 21.037 30.728Q20.533 30.728 20.183 30.511Q19.833 30.294 19.833 29.826Q19.833 29.658 19.947 29.544Q20.060 29.431 20.228 29.431Q20.333 29.431 20.425 29.482Q20.517 29.533 20.568 29.624Q20.619 29.716 20.619 29.826Q20.619 29.974 20.517 30.095Q20.415 30.216 20.259 30.216M21.337 28.568Q21.669 28.568 21.902 28.357Q22.134 28.146 22.246 27.824Q22.357 27.501 22.357 27.185Q22.357 27.087 22.345 27.033Q22.349 27.025 22.353 27.013Q22.357 27.001 22.357 26.994Q22.357 26.751 22.314 26.488Q22.271 26.224 22.169 25.996Q22.068 25.767 21.886 25.624Q21.704 25.482 21.435 25.482Q21.001 25.482 20.775 25.703Q20.548 25.923 20.476 26.255Q20.404 26.587 20.404 27.025Q20.404 27.470 20.460 27.792Q20.517 28.115 20.722 28.341Q20.927 28.568 21.337 28.568M24.154 32.560L24.072 32.560Q24.037 32.560 24.011 32.531Q23.986 32.501 23.986 32.462Q23.986 32.412 24.017 32.392Q24.404 32.056 24.687 31.607Q24.970 31.158 25.136 30.658Q25.302 30.158 25.376 29.640Q25.451 29.122 25.451 28.560Q25.451 27.990 25.376 27.474Q25.302 26.958 25.136 26.462Q24.970 25.966 24.691 25.519Q24.412 25.072 24.017 24.728Q23.986 24.708 23.986 24.658Q23.986 24.619 24.011 24.589Q24.037 24.560 24.072 24.560L24.154 24.560Q24.165 24.560 24.175 24.562Q24.185 24.564 24.193 24.568Q24.806 25.025 25.208 25.660Q25.611 26.294 25.806 27.040Q26.001 27.787 26.001 28.560Q26.001 29.333 25.806 30.080Q25.611 30.826 25.208 31.460Q24.806 32.095 24.193 32.552Q24.181 32.552 24.173 32.554Q24.165 32.556 24.154 32.560\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cpath fill=\"none\" d=\"M-68.737 41.94h85.359V19.18h-85.359Z\"\u002F>\u003Cg stroke=\"none\" font-size=\"8\">\u003Cg transform=\"translate(-24.91 2)\">\u003Cpath d=\"M-25.988 30.322L-25.988 30.232Q-25.945 30.025-25.738 30.001L-25.316 30.001L-25.316 27.673L-25.738 27.673Q-25.945 27.650-25.988 27.431L-25.988 27.345Q-25.941 27.134-25.738 27.111L-24.921 27.111Q-24.726 27.134-24.675 27.345L-24.675 27.431L-24.683 27.455Q-24.456 27.275-24.183 27.173Q-23.910 27.072-23.617 27.072Q-23.269 27.072-23.031 27.212Q-22.792 27.353-22.677 27.611Q-22.562 27.869-22.562 28.224L-22.562 30.001L-22.136 30.001Q-21.929 30.025-21.890 30.232L-21.890 30.322Q-21.929 30.537-22.136 30.560L-23.531 30.560Q-23.726 30.537-23.777 30.322L-23.777 30.232Q-23.726 30.021-23.531 30.001L-23.203 30.001L-23.203 28.255Q-23.203 27.947-23.292 27.789Q-23.382 27.630-23.675 27.630Q-23.945 27.630-24.173 27.761Q-24.402 27.892-24.538 28.121Q-24.675 28.349-24.675 28.615L-24.675 30.001L-24.249 30.001Q-24.042 30.025-24.003 30.232L-24.003 30.322Q-24.042 30.537-24.249 30.560L-25.738 30.560Q-25.945 30.537-25.988 30.322\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-24.91 2)\">\u003Cpath d=\"M-14.045 29.072L-16.487 29.072Q-16.432 29.349-16.235 29.572Q-16.037 29.794-15.760 29.917Q-15.483 30.040-15.198 30.040Q-14.725 30.040-14.502 29.751Q-14.494 29.740-14.438 29.634Q-14.381 29.529-14.332 29.486Q-14.284 29.443-14.190 29.431L-14.045 29.431Q-13.854 29.451-13.795 29.665L-13.795 29.720Q-13.862 30.021-14.092 30.218Q-14.323 30.415-14.635 30.507Q-14.948 30.599-15.252 30.599Q-15.737 30.599-16.176 30.371Q-16.616 30.142-16.883 29.742Q-17.151 29.341-17.151 28.849L-17.151 28.790Q-17.151 28.322-16.905 27.919Q-16.659 27.517-16.250 27.283Q-15.842 27.048-15.373 27.048Q-14.869 27.048-14.516 27.271Q-14.162 27.494-13.979 27.882Q-13.795 28.271-13.795 28.775L-13.795 28.833Q-13.854 29.048-14.045 29.072M-16.479 28.521L-14.452 28.521Q-14.498 28.111-14.737 27.859Q-14.975 27.607-15.373 27.607Q-15.768 27.607-16.075 27.869Q-16.381 28.130-16.479 28.521\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-24.91 2)\">\u003Cpath d=\"M-7.857 32.552Q-8.470 32.095-8.872 31.460Q-9.275 30.826-9.470 30.080Q-9.665 29.333-9.665 28.560Q-9.665 27.787-9.470 27.040Q-9.275 26.294-8.872 25.660Q-8.470 25.025-7.857 24.568Q-7.845 24.564-7.837 24.562Q-7.829 24.560-7.818 24.560L-7.740 24.560Q-7.701 24.560-7.675 24.587Q-7.650 24.615-7.650 24.658Q-7.650 24.708-7.681 24.728Q-8.189 25.181-8.511 25.804Q-8.833 26.427-8.974 27.122Q-9.115 27.818-9.115 28.560Q-9.115 29.294-8.976 29.994Q-8.837 30.693-8.513 31.318Q-8.189 31.943-7.681 32.392Q-7.650 32.412-7.650 32.462Q-7.650 32.505-7.675 32.533Q-7.701 32.560-7.740 32.560L-7.818 32.560Q-7.826 32.556-7.835 32.554Q-7.845 32.552-7.857 32.552M-6.888 28.833Q-6.888 28.337-6.638 27.912Q-6.388 27.486-5.968 27.240Q-5.548 26.994-5.048 26.994Q-4.509 26.994-4.119 27.119Q-3.728 27.244-3.728 27.658Q-3.728 27.763-3.779 27.855Q-3.829 27.947-3.921 27.997Q-4.013 28.048-4.122 28.048Q-4.228 28.048-4.320 27.997Q-4.412 27.947-4.462 27.855Q-4.513 27.763-4.513 27.658Q-4.513 27.435-4.345 27.330Q-4.568 27.271-5.040 27.271Q-5.337 27.271-5.552 27.410Q-5.767 27.548-5.898 27.779Q-6.029 28.009-6.087 28.279Q-6.146 28.548-6.146 28.833Q-6.146 29.228-6.013 29.578Q-5.880 29.927-5.609 30.144Q-5.337 30.361-4.939 30.361Q-4.564 30.361-4.288 30.144Q-4.013 29.927-3.912 29.568Q-3.896 29.505-3.833 29.505L-3.728 29.505Q-3.693 29.505-3.667 29.533Q-3.642 29.560-3.642 29.599L-3.642 29.622Q-3.775 30.103-4.160 30.371Q-4.544 30.638-5.048 30.638Q-5.412 30.638-5.745 30.501Q-6.079 30.365-6.339 30.115Q-6.599 29.865-6.744 29.529Q-6.888 29.193-6.888 28.833M-3.154 28.865Q-3.154 28.361-2.898 27.929Q-2.642 27.497-2.206 27.246Q-1.771 26.994-1.271 26.994Q-0.884 26.994-0.542 27.138Q-0.201 27.283 0.061 27.544Q0.323 27.806 0.465 28.142Q0.608 28.478 0.608 28.865Q0.608 29.357 0.344 29.767Q0.081 30.177-0.349 30.408Q-0.779 30.638-1.271 30.638Q-1.763 30.638-2.197 30.406Q-2.630 30.173-2.892 29.765Q-3.154 29.357-3.154 28.865M-1.271 30.361Q-0.814 30.361-0.562 30.138Q-0.310 29.915-0.222 29.564Q-0.134 29.212-0.134 28.767Q-0.134 28.337-0.228 27.999Q-0.322 27.662-0.576 27.455Q-0.829 27.247-1.271 27.247Q-1.919 27.247-2.163 27.664Q-2.408 28.080-2.408 28.767Q-2.408 29.212-2.320 29.564Q-2.232 29.915-1.980 30.138Q-1.728 30.361-1.271 30.361M1.776 29.607L1.776 27.865Q1.776 27.650 1.713 27.554Q1.651 27.458 1.532 27.437Q1.413 27.415 1.167 27.415L1.167 27.119L2.413 27.033L2.413 29.583L2.413 29.607Q2.413 29.919 2.467 30.081Q2.522 30.244 2.672 30.314Q2.823 30.384 3.143 30.384Q3.573 30.384 3.846 30.046Q4.120 29.708 4.120 29.263L4.120 27.865Q4.120 27.650 4.057 27.554Q3.995 27.458 3.876 27.437Q3.756 27.415 3.510 27.415L3.510 27.119L4.756 27.033L4.756 29.818Q4.756 30.029 4.819 30.124Q4.881 30.220 5.001 30.242Q5.120 30.263 5.366 30.263L5.366 30.560L4.143 30.638L4.143 30.017Q3.975 30.306 3.694 30.472Q3.413 30.638 3.092 30.638Q1.776 30.638 1.776 29.607M7.741 30.560L5.885 30.560L5.885 30.263Q6.159 30.263 6.327 30.216Q6.495 30.169 6.495 30.001L6.495 27.865Q6.495 27.650 6.432 27.554Q6.370 27.458 6.251 27.437Q6.131 27.415 5.885 27.415L5.885 27.119L7.077 27.033L7.077 27.767Q7.190 27.552 7.383 27.384Q7.577 27.216 7.815 27.124Q8.053 27.033 8.307 27.033Q9.475 27.033 9.475 28.111L9.475 30.001Q9.475 30.169 9.645 30.216Q9.815 30.263 10.085 30.263L10.085 30.560L8.229 30.560L8.229 30.263Q8.503 30.263 8.671 30.216Q8.838 30.169 8.838 30.001L8.838 28.126Q8.838 27.744 8.717 27.515Q8.596 27.287 8.245 27.287Q7.932 27.287 7.678 27.449Q7.424 27.611 7.278 27.880Q7.131 28.150 7.131 28.447L7.131 30.001Q7.131 30.169 7.301 30.216Q7.471 30.263 7.741 30.263\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-24.91 2)\">\u003Cpath d=\"M10.931 29.599L10.931 27.408L10.228 27.408L10.228 27.154Q10.584 27.154 10.826 26.921Q11.068 26.689 11.179 26.341Q11.291 25.994 11.291 25.638L11.572 25.638L11.572 27.111L12.748 27.111L12.748 27.408L11.572 27.408L11.572 29.583Q11.572 29.904 11.691 30.132Q11.810 30.361 12.091 30.361Q12.271 30.361 12.388 30.238Q12.505 30.115 12.558 29.935Q12.611 29.755 12.611 29.583L12.611 29.111L12.892 29.111L12.892 29.599Q12.892 29.853 12.787 30.093Q12.681 30.333 12.484 30.486Q12.287 30.638 12.029 30.638Q11.713 30.638 11.461 30.515Q11.209 30.392 11.070 30.158Q10.931 29.923 10.931 29.599\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(-24.91 2)\">\u003Cpath d=\"M16.559 29.337Q16.559 28.841 16.885 28.476Q17.211 28.111 17.734 27.865L17.465 27.705Q17.168 27.521 16.984 27.226Q16.801 26.931 16.801 26.591Q16.801 26.197 17.020 25.886Q17.238 25.576 17.592 25.408Q17.945 25.240 18.328 25.240Q18.602 25.240 18.875 25.318Q19.148 25.396 19.365 25.544Q19.582 25.693 19.719 25.919Q19.855 26.146 19.855 26.439Q19.855 26.845 19.586 27.152Q19.316 27.458 18.895 27.673L19.344 27.943Q19.562 28.080 19.730 28.273Q19.898 28.466 19.996 28.705Q20.094 28.943 20.094 29.201Q20.094 29.540 19.943 29.828Q19.793 30.115 19.547 30.312Q19.301 30.509 18.977 30.619Q18.652 30.728 18.328 30.728Q17.898 30.728 17.492 30.566Q17.086 30.404 16.822 30.085Q16.559 29.767 16.559 29.337M17.047 29.337Q17.047 29.822 17.437 30.138Q17.828 30.455 18.328 30.455Q18.621 30.455 18.920 30.343Q19.219 30.232 19.412 30.013Q19.605 29.794 19.605 29.482Q19.605 29.251 19.465 29.040Q19.324 28.830 19.117 28.712L18.008 28.033Q17.590 28.236 17.318 28.572Q17.047 28.908 17.047 29.337M17.633 26.904L18.621 27.505Q18.969 27.322 19.195 27.052Q19.422 26.783 19.422 26.439Q19.422 26.220 19.330 26.044Q19.238 25.869 19.084 25.746Q18.930 25.622 18.728 25.552Q18.527 25.482 18.328 25.482Q17.922 25.482 17.576 25.693Q17.230 25.904 17.230 26.287Q17.230 26.470 17.342 26.632Q17.453 26.794 17.633 26.904M21.094 32.560L21.012 32.560Q20.977 32.560 20.951 32.531Q20.926 32.501 20.926 32.462Q20.926 32.412 20.957 32.392Q21.344 32.056 21.627 31.607Q21.910 31.158 22.076 30.658Q22.242 30.158 22.316 29.640Q22.391 29.122 22.391 28.560Q22.391 27.990 22.316 27.474Q22.242 26.958 22.076 26.462Q21.910 25.966 21.631 25.519Q21.352 25.072 20.957 24.728Q20.926 24.708 20.926 24.658Q20.926 24.619 20.951 24.589Q20.977 24.560 21.012 24.560L21.094 24.560Q21.105 24.560 21.115 24.562Q21.125 24.564 21.133 24.568Q21.746 25.025 22.148 25.660Q22.551 26.294 22.746 27.040Q22.941 27.787 22.941 28.560Q22.941 29.333 22.746 30.080Q22.551 30.826 22.148 31.460Q21.746 32.095 21.133 32.552Q21.121 32.552 21.113 32.554Q21.105 32.556 21.094 32.560\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cg stroke=\"var(--tk-accent)\" style=\"stroke-width:.8\">\u003Cpath fill=\"none\" d=\"M84.908-49.108h85.358V-71.87H84.908Z\"\u002F>\u003Cg fill=\"var(--tk-accent)\" stroke=\"none\" font-size=\"8\">\u003Cg transform=\"translate(141.13 -88.27)\">\u003Cpath d=\"M-25.722 29.728Q-25.722 29.244-25.320 28.949Q-24.917 28.654-24.367 28.535Q-23.816 28.415-23.324 28.415L-23.324 28.126Q-23.324 27.900-23.439 27.693Q-23.554 27.486-23.751 27.367Q-23.949 27.247-24.179 27.247Q-24.605 27.247-24.890 27.353Q-24.820 27.380-24.773 27.435Q-24.726 27.490-24.701 27.560Q-24.675 27.630-24.675 27.705Q-24.675 27.810-24.726 27.902Q-24.777 27.994-24.869 28.044Q-24.960 28.095-25.066 28.095Q-25.171 28.095-25.263 28.044Q-25.355 27.994-25.406 27.902Q-25.456 27.810-25.456 27.705Q-25.456 27.287-25.068 27.140Q-24.679 26.994-24.179 26.994Q-23.847 26.994-23.494 27.124Q-23.140 27.255-22.912 27.509Q-22.683 27.763-22.683 28.111L-22.683 29.912Q-22.683 30.044-22.611 30.154Q-22.538 30.263-22.410 30.263Q-22.285 30.263-22.216 30.158Q-22.148 30.052-22.148 29.912L-22.148 29.400L-21.867 29.400L-21.867 29.912Q-21.867 30.115-21.984 30.273Q-22.101 30.431-22.283 30.515Q-22.464 30.599-22.667 30.599Q-22.898 30.599-23.050 30.427Q-23.203 30.255-23.234 30.025Q-23.394 30.306-23.703 30.472Q-24.011 30.638-24.363 30.638Q-24.874 30.638-25.298 30.415Q-25.722 30.193-25.722 29.728M-25.035 29.728Q-25.035 30.013-24.808 30.199Q-24.581 30.384-24.288 30.384Q-24.042 30.384-23.818 30.267Q-23.593 30.150-23.458 29.947Q-23.324 29.744-23.324 29.490L-23.324 28.658Q-23.589 28.658-23.874 28.712Q-24.160 28.767-24.431 28.896Q-24.703 29.025-24.869 29.232Q-25.035 29.439-25.035 29.728M-19.757 30.638Q-20.238 30.638-20.646 30.394Q-21.054 30.150-21.292 29.736Q-21.531 29.322-21.531 28.833Q-21.531 28.341-21.273 27.925Q-21.015 27.509-20.583 27.271Q-20.152 27.033-19.660 27.033Q-19.038 27.033-18.589 27.470L-18.589 25.841Q-18.589 25.626-18.652 25.531Q-18.714 25.435-18.831 25.414Q-18.949 25.392-19.195 25.392L-19.195 25.095L-17.972 25.009L-17.972 29.818Q-17.972 30.029-17.910 30.124Q-17.847 30.220-17.730 30.242Q-17.613 30.263-17.363 30.263L-17.363 30.560L-18.613 30.638L-18.613 30.154Q-19.078 30.638-19.757 30.638M-19.691 30.384Q-19.351 30.384-19.058 30.193Q-18.765 30.001-18.613 29.705L-18.613 27.872Q-18.761 27.599-19.023 27.443Q-19.285 27.287-19.597 27.287Q-20.222 27.287-20.505 27.734Q-20.788 28.181-20.788 28.841Q-20.788 29.486-20.537 29.935Q-20.285 30.384-19.691 30.384M-15.038 30.638Q-15.519 30.638-15.927 30.394Q-16.335 30.150-16.574 29.736Q-16.812 29.322-16.812 28.833Q-16.812 28.341-16.554 27.925Q-16.296 27.509-15.865 27.271Q-15.433 27.033-14.941 27.033Q-14.320 27.033-13.870 27.470L-13.870 25.841Q-13.870 25.626-13.933 25.531Q-13.995 25.435-14.113 25.414Q-14.230 25.392-14.476 25.392L-14.476 25.095L-13.253 25.009L-13.253 29.818Q-13.253 30.029-13.191 30.124Q-13.128 30.220-13.011 30.242Q-12.894 30.263-12.644 30.263L-12.644 30.560L-13.894 30.638L-13.894 30.154Q-14.359 30.638-15.038 30.638M-14.972 30.384Q-14.632 30.384-14.339 30.193Q-14.046 30.001-13.894 29.705L-13.894 27.872Q-14.042 27.599-14.304 27.443Q-14.566 27.287-14.878 27.287Q-15.503 27.287-15.787 27.734Q-16.070 28.181-16.070 28.841Q-16.070 29.486-15.818 29.935Q-15.566 30.384-14.972 30.384\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(141.13 -88.27)\">\u003Cpath d=\"M-6.018 29.072L-8.460 29.072Q-8.405 29.349-8.208 29.572Q-8.010 29.794-7.733 29.917Q-7.456 30.040-7.171 30.040Q-6.698 30.040-6.475 29.751Q-6.467 29.740-6.411 29.634Q-6.354 29.529-6.305 29.486Q-6.257 29.443-6.163 29.431L-6.018 29.431Q-5.827 29.451-5.768 29.665L-5.768 29.720Q-5.835 30.021-6.065 30.218Q-6.296 30.415-6.608 30.507Q-6.921 30.599-7.225 30.599Q-7.710 30.599-8.149 30.371Q-8.589 30.142-8.856 29.742Q-9.124 29.341-9.124 28.849L-9.124 28.790Q-9.124 28.322-8.878 27.919Q-8.632 27.517-8.223 27.283Q-7.815 27.048-7.346 27.048Q-6.842 27.048-6.489 27.271Q-6.135 27.494-5.952 27.882Q-5.768 28.271-5.768 28.775L-5.768 28.833Q-5.827 29.048-6.018 29.072M-8.452 28.521L-6.425 28.521Q-6.471 28.111-6.710 27.859Q-6.948 27.607-7.346 27.607Q-7.741 27.607-8.048 27.869Q-8.354 28.130-8.452 28.521M-5.061 30.322L-5.061 30.232Q-5.003 30.025-4.811 30.001L-4.100 30.001L-4.100 27.673L-4.811 27.673Q-5.007 27.650-5.061 27.431L-5.061 27.345Q-5.003 27.134-4.811 27.111L-3.710 27.111Q-3.510 27.130-3.460 27.345L-3.460 27.673Q-3.198 27.388-2.842 27.230Q-2.487 27.072-2.100 27.072Q-1.807 27.072-1.573 27.206Q-1.339 27.341-1.339 27.607Q-1.339 27.775-1.448 27.892Q-1.557 28.009-1.725 28.009Q-1.878 28.009-1.993 27.898Q-2.108 27.787-2.108 27.630Q-2.483 27.630-2.798 27.831Q-3.112 28.033-3.286 28.367Q-3.460 28.701-3.460 29.080L-3.460 30.001L-2.514 30.001Q-2.307 30.025-2.268 30.232L-2.268 30.322Q-2.307 30.537-2.514 30.560L-4.811 30.560Q-5.003 30.537-5.061 30.322\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003C\u002Fg>\u003Cg stroke=\"var(--tk-accent)\" style=\"stroke-width:.8\">\u003Cpath fill=\"none\" d=\"M84.908-3.584h85.358v-22.762H84.908Z\"\u002F>\u003Cg fill=\"var(--tk-accent)\" stroke=\"none\">\u003Cg transform=\"translate(139.6 -42.747)\">\u003Cpath d=\"M-25.722 29.728Q-25.722 29.244-25.320 28.949Q-24.917 28.654-24.367 28.535Q-23.816 28.415-23.324 28.415L-23.324 28.126Q-23.324 27.900-23.439 27.693Q-23.554 27.486-23.751 27.367Q-23.949 27.247-24.179 27.247Q-24.605 27.247-24.890 27.353Q-24.820 27.380-24.773 27.435Q-24.726 27.490-24.701 27.560Q-24.675 27.630-24.675 27.705Q-24.675 27.810-24.726 27.902Q-24.777 27.994-24.869 28.044Q-24.960 28.095-25.066 28.095Q-25.171 28.095-25.263 28.044Q-25.355 27.994-25.406 27.902Q-25.456 27.810-25.456 27.705Q-25.456 27.287-25.068 27.140Q-24.679 26.994-24.179 26.994Q-23.847 26.994-23.494 27.124Q-23.140 27.255-22.912 27.509Q-22.683 27.763-22.683 28.111L-22.683 29.912Q-22.683 30.044-22.611 30.154Q-22.538 30.263-22.410 30.263Q-22.285 30.263-22.216 30.158Q-22.148 30.052-22.148 29.912L-22.148 29.400L-21.867 29.400L-21.867 29.912Q-21.867 30.115-21.984 30.273Q-22.101 30.431-22.283 30.515Q-22.464 30.599-22.667 30.599Q-22.898 30.599-23.050 30.427Q-23.203 30.255-23.234 30.025Q-23.394 30.306-23.703 30.472Q-24.011 30.638-24.363 30.638Q-24.874 30.638-25.298 30.415Q-25.722 30.193-25.722 29.728M-25.035 29.728Q-25.035 30.013-24.808 30.199Q-24.581 30.384-24.288 30.384Q-24.042 30.384-23.818 30.267Q-23.593 30.150-23.458 29.947Q-23.324 29.744-23.324 29.490L-23.324 28.658Q-23.589 28.658-23.874 28.712Q-24.160 28.767-24.431 28.896Q-24.703 29.025-24.869 29.232Q-25.035 29.439-25.035 29.728M-19.757 30.638Q-20.238 30.638-20.646 30.394Q-21.054 30.150-21.292 29.736Q-21.531 29.322-21.531 28.833Q-21.531 28.341-21.273 27.925Q-21.015 27.509-20.583 27.271Q-20.152 27.033-19.660 27.033Q-19.038 27.033-18.589 27.470L-18.589 25.841Q-18.589 25.626-18.652 25.531Q-18.714 25.435-18.831 25.414Q-18.949 25.392-19.195 25.392L-19.195 25.095L-17.972 25.009L-17.972 29.818Q-17.972 30.029-17.910 30.124Q-17.847 30.220-17.730 30.242Q-17.613 30.263-17.363 30.263L-17.363 30.560L-18.613 30.638L-18.613 30.154Q-19.078 30.638-19.757 30.638M-19.691 30.384Q-19.351 30.384-19.058 30.193Q-18.765 30.001-18.613 29.705L-18.613 27.872Q-18.761 27.599-19.023 27.443Q-19.285 27.287-19.597 27.287Q-20.222 27.287-20.505 27.734Q-20.788 28.181-20.788 28.841Q-20.788 29.486-20.537 29.935Q-20.285 30.384-19.691 30.384M-15.038 30.638Q-15.519 30.638-15.927 30.394Q-16.335 30.150-16.574 29.736Q-16.812 29.322-16.812 28.833Q-16.812 28.341-16.554 27.925Q-16.296 27.509-15.865 27.271Q-15.433 27.033-14.941 27.033Q-14.320 27.033-13.870 27.470L-13.870 25.841Q-13.870 25.626-13.933 25.531Q-13.995 25.435-14.113 25.414Q-14.230 25.392-14.476 25.392L-14.476 25.095L-13.253 25.009L-13.253 29.818Q-13.253 30.029-13.191 30.124Q-13.128 30.220-13.011 30.242Q-12.894 30.263-12.644 30.263L-12.644 30.560L-13.894 30.638L-13.894 30.154Q-14.359 30.638-15.038 30.638M-14.972 30.384Q-14.632 30.384-14.339 30.193Q-14.046 30.001-13.894 29.705L-13.894 27.872Q-14.042 27.599-14.304 27.443Q-14.566 27.287-14.878 27.287Q-15.503 27.287-15.787 27.734Q-16.070 28.181-16.070 28.841Q-16.070 29.486-15.818 29.935Q-15.566 30.384-14.972 30.384\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(139.6 -42.747)\">\u003Cpath d=\"M-6.018 29.072L-8.460 29.072Q-8.405 29.349-8.208 29.572Q-8.010 29.794-7.733 29.917Q-7.456 30.040-7.171 30.040Q-6.698 30.040-6.475 29.751Q-6.467 29.740-6.411 29.634Q-6.354 29.529-6.305 29.486Q-6.257 29.443-6.163 29.431L-6.018 29.431Q-5.827 29.451-5.768 29.665L-5.768 29.720Q-5.835 30.021-6.065 30.218Q-6.296 30.415-6.608 30.507Q-6.921 30.599-7.225 30.599Q-7.710 30.599-8.149 30.371Q-8.589 30.142-8.856 29.742Q-9.124 29.341-9.124 28.849L-9.124 28.790Q-9.124 28.322-8.878 27.919Q-8.632 27.517-8.223 27.283Q-7.815 27.048-7.346 27.048Q-6.842 27.048-6.489 27.271Q-6.135 27.494-5.952 27.882Q-5.768 28.271-5.768 28.775L-5.768 28.833Q-5.827 29.048-6.018 29.072M-8.452 28.521L-6.425 28.521Q-6.471 28.111-6.710 27.859Q-6.948 27.607-7.346 27.607Q-7.741 27.607-8.048 27.869Q-8.354 28.130-8.452 28.521M-5.061 30.322L-5.061 30.232Q-5.003 30.025-4.811 30.001L-4.100 30.001L-4.100 27.673L-4.811 27.673Q-5.007 27.650-5.061 27.431L-5.061 27.345Q-5.003 27.134-4.811 27.111L-3.710 27.111Q-3.510 27.130-3.460 27.345L-3.460 27.673Q-3.198 27.388-2.842 27.230Q-2.487 27.072-2.100 27.072Q-1.807 27.072-1.573 27.206Q-1.339 27.341-1.339 27.607Q-1.339 27.775-1.448 27.892Q-1.557 28.009-1.725 28.009Q-1.878 28.009-1.993 27.898Q-2.108 27.787-2.108 27.630Q-2.483 27.630-2.798 27.831Q-3.112 28.033-3.286 28.367Q-3.460 28.701-3.460 29.080L-3.460 30.001L-2.514 30.001Q-2.307 30.025-2.268 30.232L-2.268 30.322Q-2.307 30.537-2.514 30.560L-4.811 30.560Q-5.003 30.537-5.061 30.322\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cpath d=\"M139.082-12.587h2.55v.4h-2.55z\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cg stroke=\"var(--tk-accent)\" style=\"stroke-width:.8\">\u003Cpath fill=\"none\" d=\"M84.908 41.94h85.358V19.18H84.908Z\"\u002F>\u003Cg fill=\"var(--tk-accent)\" stroke=\"none\" font-size=\"8\">\u003Cg transform=\"translate(141.13 2.778)\">\u003Cpath d=\"M-25.722 29.728Q-25.722 29.244-25.320 28.949Q-24.917 28.654-24.367 28.535Q-23.816 28.415-23.324 28.415L-23.324 28.126Q-23.324 27.900-23.439 27.693Q-23.554 27.486-23.751 27.367Q-23.949 27.247-24.179 27.247Q-24.605 27.247-24.890 27.353Q-24.820 27.380-24.773 27.435Q-24.726 27.490-24.701 27.560Q-24.675 27.630-24.675 27.705Q-24.675 27.810-24.726 27.902Q-24.777 27.994-24.869 28.044Q-24.960 28.095-25.066 28.095Q-25.171 28.095-25.263 28.044Q-25.355 27.994-25.406 27.902Q-25.456 27.810-25.456 27.705Q-25.456 27.287-25.068 27.140Q-24.679 26.994-24.179 26.994Q-23.847 26.994-23.494 27.124Q-23.140 27.255-22.912 27.509Q-22.683 27.763-22.683 28.111L-22.683 29.912Q-22.683 30.044-22.611 30.154Q-22.538 30.263-22.410 30.263Q-22.285 30.263-22.216 30.158Q-22.148 30.052-22.148 29.912L-22.148 29.400L-21.867 29.400L-21.867 29.912Q-21.867 30.115-21.984 30.273Q-22.101 30.431-22.283 30.515Q-22.464 30.599-22.667 30.599Q-22.898 30.599-23.050 30.427Q-23.203 30.255-23.234 30.025Q-23.394 30.306-23.703 30.472Q-24.011 30.638-24.363 30.638Q-24.874 30.638-25.298 30.415Q-25.722 30.193-25.722 29.728M-25.035 29.728Q-25.035 30.013-24.808 30.199Q-24.581 30.384-24.288 30.384Q-24.042 30.384-23.818 30.267Q-23.593 30.150-23.458 29.947Q-23.324 29.744-23.324 29.490L-23.324 28.658Q-23.589 28.658-23.874 28.712Q-24.160 28.767-24.431 28.896Q-24.703 29.025-24.869 29.232Q-25.035 29.439-25.035 29.728M-19.757 30.638Q-20.238 30.638-20.646 30.394Q-21.054 30.150-21.292 29.736Q-21.531 29.322-21.531 28.833Q-21.531 28.341-21.273 27.925Q-21.015 27.509-20.583 27.271Q-20.152 27.033-19.660 27.033Q-19.038 27.033-18.589 27.470L-18.589 25.841Q-18.589 25.626-18.652 25.531Q-18.714 25.435-18.831 25.414Q-18.949 25.392-19.195 25.392L-19.195 25.095L-17.972 25.009L-17.972 29.818Q-17.972 30.029-17.910 30.124Q-17.847 30.220-17.730 30.242Q-17.613 30.263-17.363 30.263L-17.363 30.560L-18.613 30.638L-18.613 30.154Q-19.078 30.638-19.757 30.638M-19.691 30.384Q-19.351 30.384-19.058 30.193Q-18.765 30.001-18.613 29.705L-18.613 27.872Q-18.761 27.599-19.023 27.443Q-19.285 27.287-19.597 27.287Q-20.222 27.287-20.505 27.734Q-20.788 28.181-20.788 28.841Q-20.788 29.486-20.537 29.935Q-20.285 30.384-19.691 30.384M-15.038 30.638Q-15.519 30.638-15.927 30.394Q-16.335 30.150-16.574 29.736Q-16.812 29.322-16.812 28.833Q-16.812 28.341-16.554 27.925Q-16.296 27.509-15.865 27.271Q-15.433 27.033-14.941 27.033Q-14.320 27.033-13.870 27.470L-13.870 25.841Q-13.870 25.626-13.933 25.531Q-13.995 25.435-14.113 25.414Q-14.230 25.392-14.476 25.392L-14.476 25.095L-13.253 25.009L-13.253 29.818Q-13.253 30.029-13.191 30.124Q-13.128 30.220-13.011 30.242Q-12.894 30.263-12.644 30.263L-12.644 30.560L-13.894 30.638L-13.894 30.154Q-14.359 30.638-15.038 30.638M-14.972 30.384Q-14.632 30.384-14.339 30.193Q-14.046 30.001-13.894 29.705L-13.894 27.872Q-14.042 27.599-14.304 27.443Q-14.566 27.287-14.878 27.287Q-15.503 27.287-15.787 27.734Q-16.070 28.181-16.070 28.841Q-16.070 29.486-15.818 29.935Q-15.566 30.384-14.972 30.384\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(141.13 2.778)\">\u003Cpath d=\"M-9.460 30.322L-9.460 30.232Q-9.417 30.025-9.210 30.001L-8.788 30.001L-8.788 27.673L-9.210 27.673Q-9.417 27.650-9.460 27.431L-9.460 27.345Q-9.413 27.134-9.210 27.111L-8.393 27.111Q-8.198 27.134-8.147 27.345L-8.147 27.431L-8.155 27.455Q-7.928 27.275-7.655 27.173Q-7.382 27.072-7.089 27.072Q-6.741 27.072-6.503 27.212Q-6.264 27.353-6.149 27.611Q-6.034 27.869-6.034 28.224L-6.034 30.001L-5.608 30.001Q-5.401 30.025-5.362 30.232L-5.362 30.322Q-5.401 30.537-5.608 30.560L-7.003 30.560Q-7.198 30.537-7.249 30.322L-7.249 30.232Q-7.198 30.021-7.003 30.001L-6.675 30.001L-6.675 28.255Q-6.675 27.947-6.764 27.789Q-6.854 27.630-7.147 27.630Q-7.417 27.630-7.645 27.761Q-7.874 27.892-8.010 28.121Q-8.147 28.349-8.147 28.615L-8.147 30.001L-7.721 30.001Q-7.514 30.025-7.475 30.232L-7.475 30.322Q-7.514 30.537-7.721 30.560L-9.210 30.560Q-9.417 30.537-9.460 30.322M-1.772 29.072L-4.214 29.072Q-4.159 29.349-3.962 29.572Q-3.764 29.794-3.487 29.917Q-3.210 30.040-2.925 30.040Q-2.452 30.040-2.229 29.751Q-2.221 29.740-2.165 29.634Q-2.108 29.529-2.059 29.486Q-2.010 29.443-1.917 29.431L-1.772 29.431Q-1.581 29.451-1.522 29.665L-1.522 29.720Q-1.589 30.021-1.819 30.218Q-2.050 30.415-2.362 30.507Q-2.675 30.599-2.979 30.599Q-3.464 30.599-3.903 30.371Q-4.342 30.142-4.610 29.742Q-4.878 29.341-4.878 28.849L-4.878 28.790Q-4.878 28.322-4.632 27.919Q-4.385 27.517-3.977 27.283Q-3.569 27.048-3.100 27.048Q-2.596 27.048-2.243 27.271Q-1.889 27.494-1.706 27.882Q-1.522 28.271-1.522 28.775L-1.522 28.833Q-1.581 29.048-1.772 29.072M-4.206 28.521L-2.178 28.521Q-2.225 28.111-2.464 27.859Q-2.702 27.607-3.100 27.607Q-3.495 27.607-3.801 27.869Q-4.108 28.130-4.206 28.521\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003C\u002Fg>\u003Cg fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" style=\"stroke-width:.8\">\u003Cpath fill=\"none\" d=\"M16.822-60.489h65.086\"\u002F>\u003Cpath stroke=\"none\" d=\"m84.508-60.489-4.16-2.08 1.56 2.08-1.56 2.08\"\u002F>\u003Cg transform=\"translate(66.326 -96.143)\">\u003Cpath d=\"M-24.062 30.560L-25.696 30.560L-25.696 30.280Q-25.467 30.280-25.318 30.246Q-25.169 30.211-25.169 30.071L-25.169 28.222Q-25.169 27.952-25.277 27.891Q-25.385 27.829-25.696 27.829L-25.696 27.549L-24.636 27.474L-24.636 28.123Q-24.465 27.815-24.161 27.644Q-23.857 27.474-23.512 27.474Q-23.112 27.474-22.835 27.614Q-22.558 27.754-22.473 28.102Q-22.305 27.809-22.006 27.641Q-21.707 27.474-21.362 27.474Q-20.856 27.474-20.572 27.697Q-20.288 27.921-20.288 28.417L-20.288 30.071Q-20.288 30.208-20.140 30.244Q-19.991 30.280-19.766 30.280L-19.766 30.560L-21.396 30.560L-21.396 30.280Q-21.170 30.280-21.020 30.244Q-20.870 30.208-20.870 30.071L-20.870 28.431Q-20.870 28.096-20.989 27.896Q-21.109 27.696-21.423 27.696Q-21.693 27.696-21.927 27.832Q-22.162 27.969-22.300 28.203Q-22.438 28.437-22.438 28.711L-22.438 30.071Q-22.438 30.208-22.290 30.244Q-22.141 30.280-21.915 30.280L-21.915 30.560L-23.546 30.560L-23.546 30.280Q-23.317 30.280-23.168 30.246Q-23.019 30.211-23.019 30.071L-23.019 28.431Q-23.019 28.096-23.139 27.896Q-23.259 27.696-23.573 27.696Q-23.843 27.696-24.077 27.832Q-24.311 27.969-24.450 28.203Q-24.588 28.437-24.588 28.711L-24.588 30.071Q-24.588 30.208-24.438 30.244Q-24.287 30.280-24.062 30.280L-24.062 30.560M-19.219 29.025Q-19.219 28.704-19.094 28.415Q-18.969 28.126-18.744 27.903Q-18.518 27.679-18.222 27.559Q-17.927 27.439-17.609 27.439Q-17.281 27.439-17.019 27.539Q-16.758 27.638-16.582 27.820Q-16.406 28.003-16.312 28.261Q-16.218 28.519-16.218 28.851Q-16.218 28.943-16.300 28.964L-18.556 28.964L-18.556 29.025Q-18.556 29.613-18.272 29.996Q-17.988 30.379-17.421 30.379Q-17.100 30.379-16.831 30.186Q-16.563 29.993-16.474 29.678Q-16.467 29.637-16.392 29.623L-16.300 29.623Q-16.218 29.647-16.218 29.719Q-16.218 29.726-16.225 29.753Q-16.337 30.150-16.708 30.389Q-17.079 30.628-17.503 30.628Q-17.940 30.628-18.340 30.420Q-18.740 30.211-18.979 29.844Q-19.219 29.477-19.219 29.025M-18.549 28.755L-16.734 28.755Q-16.734 28.478-16.831 28.226Q-16.929 27.973-17.127 27.817Q-17.325 27.662-17.609 27.662Q-17.886 27.662-18.099 27.820Q-18.313 27.979-18.431 28.234Q-18.549 28.489-18.549 28.755M-13.880 30.560L-15.616 30.560L-15.616 30.280Q-15.387 30.280-15.238 30.246Q-15.090 30.211-15.090 30.071L-15.090 28.222Q-15.090 27.952-15.197 27.891Q-15.305 27.829-15.616 27.829L-15.616 27.549L-14.587 27.474L-14.587 28.181Q-14.457 27.873-14.215 27.674Q-13.972 27.474-13.654 27.474Q-13.435 27.474-13.265 27.598Q-13.094 27.723-13.094 27.935Q-13.094 28.072-13.193 28.171Q-13.292 28.270-13.425 28.270Q-13.562 28.270-13.661 28.171Q-13.760 28.072-13.760 27.935Q-13.760 27.795-13.661 27.696Q-13.952 27.696-14.152 27.892Q-14.351 28.089-14.444 28.383Q-14.536 28.677-14.536 28.957L-14.536 30.071Q-14.536 30.280-13.880 30.280L-13.880 30.560M-12.550 31.093Q-12.550 30.847-12.354 30.663Q-12.157 30.478-11.901 30.399Q-12.037 30.287-12.109 30.126Q-12.181 29.965-12.181 29.784Q-12.181 29.463-11.969 29.217Q-12.304 28.919-12.304 28.509Q-12.304 28.048-11.914 27.761Q-11.525 27.474-11.046 27.474Q-10.575 27.474-10.240 27.720Q-10.065 27.566-9.855 27.484Q-9.645 27.402-9.416 27.402Q-9.252 27.402-9.131 27.509Q-9.009 27.617-9.009 27.781Q-9.009 27.877-9.081 27.949Q-9.153 28.020-9.245 28.020Q-9.344 28.020-9.414 27.947Q-9.484 27.873-9.484 27.774Q-9.484 27.720-9.471 27.689L-9.464 27.675Q-9.457 27.655-9.448 27.644Q-9.440 27.634-9.436 27.627Q-9.792 27.627-10.079 27.850Q-9.792 28.143-9.792 28.509Q-9.792 28.824-9.976 29.056Q-10.161 29.289-10.450 29.417Q-10.739 29.545-11.046 29.545Q-11.248 29.545-11.439 29.495Q-11.631 29.446-11.808 29.336Q-11.901 29.463-11.901 29.606Q-11.901 29.788-11.773 29.923Q-11.644 30.058-11.460 30.058L-10.828 30.058Q-10.380 30.058-10.011 30.129Q-9.641 30.201-9.382 30.430Q-9.122 30.659-9.122 31.093Q-9.122 31.414-9.418 31.616Q-9.713 31.818-10.117 31.907Q-10.520 31.996-10.834 31.996Q-11.152 31.996-11.556 31.907Q-11.959 31.818-12.255 31.616Q-12.550 31.414-12.550 31.093M-12.096 31.093Q-12.096 31.322-11.877 31.471Q-11.658 31.620-11.366 31.688Q-11.074 31.756-10.834 31.756Q-10.670 31.756-10.462 31.720Q-10.253 31.685-10.047 31.604Q-9.840 31.524-9.708 31.396Q-9.577 31.268-9.577 31.093Q-9.577 30.741-9.958 30.647Q-10.339 30.553-10.841 30.553L-11.460 30.553Q-11.699 30.553-11.897 30.704Q-12.096 30.854-12.096 31.093M-11.046 29.306Q-10.380 29.306-10.380 28.509Q-10.380 27.709-11.046 27.709Q-11.716 27.709-11.716 28.509Q-11.716 29.306-11.046 29.306M-8.568 29.025Q-8.568 28.704-8.443 28.415Q-8.319 28.126-8.093 27.903Q-7.868 27.679-7.572 27.559Q-7.276 27.439-6.958 27.439Q-6.630 27.439-6.369 27.539Q-6.107 27.638-5.931 27.820Q-5.755 28.003-5.661 28.261Q-5.567 28.519-5.567 28.851Q-5.567 28.943-5.649 28.964L-7.905 28.964L-7.905 29.025Q-7.905 29.613-7.621 29.996Q-7.338 30.379-6.770 30.379Q-6.449 30.379-6.181 30.186Q-5.912 29.993-5.824 29.678Q-5.817 29.637-5.742 29.623L-5.649 29.623Q-5.567 29.647-5.567 29.719Q-5.567 29.726-5.574 29.753Q-5.687 30.150-6.058 30.389Q-6.429 30.628-6.852 30.628Q-7.290 30.628-7.690 30.420Q-8.090 30.211-8.329 29.844Q-8.568 29.477-8.568 29.025M-7.898 28.755L-6.083 28.755Q-6.083 28.478-6.181 28.226Q-6.278 27.973-6.476 27.817Q-6.675 27.662-6.958 27.662Q-7.235 27.662-7.449 27.820Q-7.662 27.979-7.780 28.234Q-7.898 28.489-7.898 28.755\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cg fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" style=\"stroke-width:.8\">\u003Cpath fill=\"none\" d=\"M16.822-14.965h65.086\"\u002F>\u003Cpath stroke=\"none\" d=\"m84.508-14.965-4.16-2.08 1.56 2.08-1.56 2.08\"\u002F>\u003Cg transform=\"translate(66.326 -50.619)\">\u003Cpath d=\"M-24.062 30.560L-25.696 30.560L-25.696 30.280Q-25.467 30.280-25.318 30.246Q-25.169 30.211-25.169 30.071L-25.169 28.222Q-25.169 27.952-25.277 27.891Q-25.385 27.829-25.696 27.829L-25.696 27.549L-24.636 27.474L-24.636 28.123Q-24.465 27.815-24.161 27.644Q-23.857 27.474-23.512 27.474Q-23.112 27.474-22.835 27.614Q-22.558 27.754-22.473 28.102Q-22.305 27.809-22.006 27.641Q-21.707 27.474-21.362 27.474Q-20.856 27.474-20.572 27.697Q-20.288 27.921-20.288 28.417L-20.288 30.071Q-20.288 30.208-20.140 30.244Q-19.991 30.280-19.766 30.280L-19.766 30.560L-21.396 30.560L-21.396 30.280Q-21.170 30.280-21.020 30.244Q-20.870 30.208-20.870 30.071L-20.870 28.431Q-20.870 28.096-20.989 27.896Q-21.109 27.696-21.423 27.696Q-21.693 27.696-21.927 27.832Q-22.162 27.969-22.300 28.203Q-22.438 28.437-22.438 28.711L-22.438 30.071Q-22.438 30.208-22.290 30.244Q-22.141 30.280-21.915 30.280L-21.915 30.560L-23.546 30.560L-23.546 30.280Q-23.317 30.280-23.168 30.246Q-23.019 30.211-23.019 30.071L-23.019 28.431Q-23.019 28.096-23.139 27.896Q-23.259 27.696-23.573 27.696Q-23.843 27.696-24.077 27.832Q-24.311 27.969-24.450 28.203Q-24.588 28.437-24.588 28.711L-24.588 30.071Q-24.588 30.208-24.438 30.244Q-24.287 30.280-24.062 30.280L-24.062 30.560M-19.219 29.025Q-19.219 28.704-19.094 28.415Q-18.969 28.126-18.744 27.903Q-18.518 27.679-18.222 27.559Q-17.927 27.439-17.609 27.439Q-17.281 27.439-17.019 27.539Q-16.758 27.638-16.582 27.820Q-16.406 28.003-16.312 28.261Q-16.218 28.519-16.218 28.851Q-16.218 28.943-16.300 28.964L-18.556 28.964L-18.556 29.025Q-18.556 29.613-18.272 29.996Q-17.988 30.379-17.421 30.379Q-17.100 30.379-16.831 30.186Q-16.563 29.993-16.474 29.678Q-16.467 29.637-16.392 29.623L-16.300 29.623Q-16.218 29.647-16.218 29.719Q-16.218 29.726-16.225 29.753Q-16.337 30.150-16.708 30.389Q-17.079 30.628-17.503 30.628Q-17.940 30.628-18.340 30.420Q-18.740 30.211-18.979 29.844Q-19.219 29.477-19.219 29.025M-18.549 28.755L-16.734 28.755Q-16.734 28.478-16.831 28.226Q-16.929 27.973-17.127 27.817Q-17.325 27.662-17.609 27.662Q-17.886 27.662-18.099 27.820Q-18.313 27.979-18.431 28.234Q-18.549 28.489-18.549 28.755M-13.880 30.560L-15.616 30.560L-15.616 30.280Q-15.387 30.280-15.238 30.246Q-15.090 30.211-15.090 30.071L-15.090 28.222Q-15.090 27.952-15.197 27.891Q-15.305 27.829-15.616 27.829L-15.616 27.549L-14.587 27.474L-14.587 28.181Q-14.457 27.873-14.215 27.674Q-13.972 27.474-13.654 27.474Q-13.435 27.474-13.265 27.598Q-13.094 27.723-13.094 27.935Q-13.094 28.072-13.193 28.171Q-13.292 28.270-13.425 28.270Q-13.562 28.270-13.661 28.171Q-13.760 28.072-13.760 27.935Q-13.760 27.795-13.661 27.696Q-13.952 27.696-14.152 27.892Q-14.351 28.089-14.444 28.383Q-14.536 28.677-14.536 28.957L-14.536 30.071Q-14.536 30.280-13.880 30.280L-13.880 30.560M-12.550 31.093Q-12.550 30.847-12.354 30.663Q-12.157 30.478-11.901 30.399Q-12.037 30.287-12.109 30.126Q-12.181 29.965-12.181 29.784Q-12.181 29.463-11.969 29.217Q-12.304 28.919-12.304 28.509Q-12.304 28.048-11.914 27.761Q-11.525 27.474-11.046 27.474Q-10.575 27.474-10.240 27.720Q-10.065 27.566-9.855 27.484Q-9.645 27.402-9.416 27.402Q-9.252 27.402-9.131 27.509Q-9.009 27.617-9.009 27.781Q-9.009 27.877-9.081 27.949Q-9.153 28.020-9.245 28.020Q-9.344 28.020-9.414 27.947Q-9.484 27.873-9.484 27.774Q-9.484 27.720-9.471 27.689L-9.464 27.675Q-9.457 27.655-9.448 27.644Q-9.440 27.634-9.436 27.627Q-9.792 27.627-10.079 27.850Q-9.792 28.143-9.792 28.509Q-9.792 28.824-9.976 29.056Q-10.161 29.289-10.450 29.417Q-10.739 29.545-11.046 29.545Q-11.248 29.545-11.439 29.495Q-11.631 29.446-11.808 29.336Q-11.901 29.463-11.901 29.606Q-11.901 29.788-11.773 29.923Q-11.644 30.058-11.460 30.058L-10.828 30.058Q-10.380 30.058-10.011 30.129Q-9.641 30.201-9.382 30.430Q-9.122 30.659-9.122 31.093Q-9.122 31.414-9.418 31.616Q-9.713 31.818-10.117 31.907Q-10.520 31.996-10.834 31.996Q-11.152 31.996-11.556 31.907Q-11.959 31.818-12.255 31.616Q-12.550 31.414-12.550 31.093M-12.096 31.093Q-12.096 31.322-11.877 31.471Q-11.658 31.620-11.366 31.688Q-11.074 31.756-10.834 31.756Q-10.670 31.756-10.462 31.720Q-10.253 31.685-10.047 31.604Q-9.840 31.524-9.708 31.396Q-9.577 31.268-9.577 31.093Q-9.577 30.741-9.958 30.647Q-10.339 30.553-10.841 30.553L-11.460 30.553Q-11.699 30.553-11.897 30.704Q-12.096 30.854-12.096 31.093M-11.046 29.306Q-10.380 29.306-10.380 28.509Q-10.380 27.709-11.046 27.709Q-11.716 27.709-11.716 28.509Q-11.716 29.306-11.046 29.306M-8.568 29.025Q-8.568 28.704-8.443 28.415Q-8.319 28.126-8.093 27.903Q-7.868 27.679-7.572 27.559Q-7.276 27.439-6.958 27.439Q-6.630 27.439-6.369 27.539Q-6.107 27.638-5.931 27.820Q-5.755 28.003-5.661 28.261Q-5.567 28.519-5.567 28.851Q-5.567 28.943-5.649 28.964L-7.905 28.964L-7.905 29.025Q-7.905 29.613-7.621 29.996Q-7.338 30.379-6.770 30.379Q-6.449 30.379-6.181 30.186Q-5.912 29.993-5.824 29.678Q-5.817 29.637-5.742 29.623L-5.649 29.623Q-5.567 29.647-5.567 29.719Q-5.567 29.726-5.574 29.753Q-5.687 30.150-6.058 30.389Q-6.429 30.628-6.852 30.628Q-7.290 30.628-7.690 30.420Q-8.090 30.211-8.329 29.844Q-8.568 29.477-8.568 29.025M-7.898 28.755L-6.083 28.755Q-6.083 28.478-6.181 28.226Q-6.278 27.973-6.476 27.817Q-6.675 27.662-6.958 27.662Q-7.235 27.662-7.449 27.820Q-7.662 27.979-7.780 28.234Q-7.898 28.489-7.898 28.755\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cg fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" style=\"stroke-width:.8\">\u003Cpath fill=\"none\" d=\"M16.822 30.56h65.086\"\u002F>\u003Cpath stroke=\"none\" d=\"m84.508 30.56-4.16-2.08 1.56 2.08-1.56 2.08\"\u002F>\u003Cg transform=\"translate(66.326 -5.094)\">\u003Cpath d=\"M-24.062 30.560L-25.696 30.560L-25.696 30.280Q-25.467 30.280-25.318 30.246Q-25.169 30.211-25.169 30.071L-25.169 28.222Q-25.169 27.952-25.277 27.891Q-25.385 27.829-25.696 27.829L-25.696 27.549L-24.636 27.474L-24.636 28.123Q-24.465 27.815-24.161 27.644Q-23.857 27.474-23.512 27.474Q-23.112 27.474-22.835 27.614Q-22.558 27.754-22.473 28.102Q-22.305 27.809-22.006 27.641Q-21.707 27.474-21.362 27.474Q-20.856 27.474-20.572 27.697Q-20.288 27.921-20.288 28.417L-20.288 30.071Q-20.288 30.208-20.140 30.244Q-19.991 30.280-19.766 30.280L-19.766 30.560L-21.396 30.560L-21.396 30.280Q-21.170 30.280-21.020 30.244Q-20.870 30.208-20.870 30.071L-20.870 28.431Q-20.870 28.096-20.989 27.896Q-21.109 27.696-21.423 27.696Q-21.693 27.696-21.927 27.832Q-22.162 27.969-22.300 28.203Q-22.438 28.437-22.438 28.711L-22.438 30.071Q-22.438 30.208-22.290 30.244Q-22.141 30.280-21.915 30.280L-21.915 30.560L-23.546 30.560L-23.546 30.280Q-23.317 30.280-23.168 30.246Q-23.019 30.211-23.019 30.071L-23.019 28.431Q-23.019 28.096-23.139 27.896Q-23.259 27.696-23.573 27.696Q-23.843 27.696-24.077 27.832Q-24.311 27.969-24.450 28.203Q-24.588 28.437-24.588 28.711L-24.588 30.071Q-24.588 30.208-24.438 30.244Q-24.287 30.280-24.062 30.280L-24.062 30.560M-19.219 29.025Q-19.219 28.704-19.094 28.415Q-18.969 28.126-18.744 27.903Q-18.518 27.679-18.222 27.559Q-17.927 27.439-17.609 27.439Q-17.281 27.439-17.019 27.539Q-16.758 27.638-16.582 27.820Q-16.406 28.003-16.312 28.261Q-16.218 28.519-16.218 28.851Q-16.218 28.943-16.300 28.964L-18.556 28.964L-18.556 29.025Q-18.556 29.613-18.272 29.996Q-17.988 30.379-17.421 30.379Q-17.100 30.379-16.831 30.186Q-16.563 29.993-16.474 29.678Q-16.467 29.637-16.392 29.623L-16.300 29.623Q-16.218 29.647-16.218 29.719Q-16.218 29.726-16.225 29.753Q-16.337 30.150-16.708 30.389Q-17.079 30.628-17.503 30.628Q-17.940 30.628-18.340 30.420Q-18.740 30.211-18.979 29.844Q-19.219 29.477-19.219 29.025M-18.549 28.755L-16.734 28.755Q-16.734 28.478-16.831 28.226Q-16.929 27.973-17.127 27.817Q-17.325 27.662-17.609 27.662Q-17.886 27.662-18.099 27.820Q-18.313 27.979-18.431 28.234Q-18.549 28.489-18.549 28.755M-13.880 30.560L-15.616 30.560L-15.616 30.280Q-15.387 30.280-15.238 30.246Q-15.090 30.211-15.090 30.071L-15.090 28.222Q-15.090 27.952-15.197 27.891Q-15.305 27.829-15.616 27.829L-15.616 27.549L-14.587 27.474L-14.587 28.181Q-14.457 27.873-14.215 27.674Q-13.972 27.474-13.654 27.474Q-13.435 27.474-13.265 27.598Q-13.094 27.723-13.094 27.935Q-13.094 28.072-13.193 28.171Q-13.292 28.270-13.425 28.270Q-13.562 28.270-13.661 28.171Q-13.760 28.072-13.760 27.935Q-13.760 27.795-13.661 27.696Q-13.952 27.696-14.152 27.892Q-14.351 28.089-14.444 28.383Q-14.536 28.677-14.536 28.957L-14.536 30.071Q-14.536 30.280-13.880 30.280L-13.880 30.560M-12.550 31.093Q-12.550 30.847-12.354 30.663Q-12.157 30.478-11.901 30.399Q-12.037 30.287-12.109 30.126Q-12.181 29.965-12.181 29.784Q-12.181 29.463-11.969 29.217Q-12.304 28.919-12.304 28.509Q-12.304 28.048-11.914 27.761Q-11.525 27.474-11.046 27.474Q-10.575 27.474-10.240 27.720Q-10.065 27.566-9.855 27.484Q-9.645 27.402-9.416 27.402Q-9.252 27.402-9.131 27.509Q-9.009 27.617-9.009 27.781Q-9.009 27.877-9.081 27.949Q-9.153 28.020-9.245 28.020Q-9.344 28.020-9.414 27.947Q-9.484 27.873-9.484 27.774Q-9.484 27.720-9.471 27.689L-9.464 27.675Q-9.457 27.655-9.448 27.644Q-9.440 27.634-9.436 27.627Q-9.792 27.627-10.079 27.850Q-9.792 28.143-9.792 28.509Q-9.792 28.824-9.976 29.056Q-10.161 29.289-10.450 29.417Q-10.739 29.545-11.046 29.545Q-11.248 29.545-11.439 29.495Q-11.631 29.446-11.808 29.336Q-11.901 29.463-11.901 29.606Q-11.901 29.788-11.773 29.923Q-11.644 30.058-11.460 30.058L-10.828 30.058Q-10.380 30.058-10.011 30.129Q-9.641 30.201-9.382 30.430Q-9.122 30.659-9.122 31.093Q-9.122 31.414-9.418 31.616Q-9.713 31.818-10.117 31.907Q-10.520 31.996-10.834 31.996Q-11.152 31.996-11.556 31.907Q-11.959 31.818-12.255 31.616Q-12.550 31.414-12.550 31.093M-12.096 31.093Q-12.096 31.322-11.877 31.471Q-11.658 31.620-11.366 31.688Q-11.074 31.756-10.834 31.756Q-10.670 31.756-10.462 31.720Q-10.253 31.685-10.047 31.604Q-9.840 31.524-9.708 31.396Q-9.577 31.268-9.577 31.093Q-9.577 30.741-9.958 30.647Q-10.339 30.553-10.841 30.553L-11.460 30.553Q-11.699 30.553-11.897 30.704Q-12.096 30.854-12.096 31.093M-11.046 29.306Q-10.380 29.306-10.380 28.509Q-10.380 27.709-11.046 27.709Q-11.716 27.709-11.716 28.509Q-11.716 29.306-11.046 29.306M-8.568 29.025Q-8.568 28.704-8.443 28.415Q-8.319 28.126-8.093 27.903Q-7.868 27.679-7.572 27.559Q-7.276 27.439-6.958 27.439Q-6.630 27.439-6.369 27.539Q-6.107 27.638-5.931 27.820Q-5.755 28.003-5.661 28.261Q-5.567 28.519-5.567 28.851Q-5.567 28.943-5.649 28.964L-7.905 28.964L-7.905 29.025Q-7.905 29.613-7.621 29.996Q-7.338 30.379-6.770 30.379Q-6.449 30.379-6.181 30.186Q-5.912 29.993-5.824 29.678Q-5.817 29.637-5.742 29.623L-5.649 29.623Q-5.567 29.647-5.567 29.719Q-5.567 29.726-5.574 29.753Q-5.687 30.150-6.058 30.389Q-6.429 30.628-6.852 30.628Q-7.290 30.628-7.690 30.420Q-8.090 30.211-8.329 29.844Q-8.568 29.477-8.568 29.025M-7.898 28.755L-6.083 28.755Q-6.083 28.478-6.181 28.226Q-6.278 27.973-6.476 27.817Q-6.675 27.662-6.958 27.662Q-7.235 27.662-7.449 27.820Q-7.662 27.979-7.780 28.234Q-7.898 28.489-7.898 28.755\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cpath fill=\"none\" d=\"M127.587-48.708c0 5.29-153.645 10.981-153.645 20.162\"\u002F>\u003Cpath stroke=\"none\" d=\"m-26.058-26.546 1.6-3.2-1.6 1.2-1.6-1.2\"\u002F>\u003Cg stroke=\"none\" font-family=\"cmr7\" font-size=\"7\">\u003Cg transform=\"translate(78.066 -78.079)\">\u003Cpath d=\"M-23.994 30.560L-25.730 30.560L-25.730 30.280Q-25.501 30.280-25.352 30.246Q-25.204 30.211-25.204 30.071L-25.204 28.222Q-25.204 27.952-25.311 27.891Q-25.419 27.829-25.730 27.829L-25.730 27.549L-24.701 27.474L-24.701 28.181Q-24.571 27.873-24.329 27.674Q-24.086 27.474-23.768 27.474Q-23.549 27.474-23.378 27.598Q-23.207 27.723-23.207 27.935Q-23.207 28.072-23.307 28.171Q-23.406 28.270-23.539 28.270Q-23.676 28.270-23.775 28.171Q-23.874 28.072-23.874 27.935Q-23.874 27.795-23.775 27.696Q-24.065 27.696-24.265 27.892Q-24.465 28.089-24.558 28.383Q-24.650 28.677-24.650 28.957L-24.650 30.071Q-24.650 30.280-23.994 30.280L-23.994 30.560M-22.664 29.025Q-22.664 28.704-22.539 28.415Q-22.414 28.126-22.189 27.903Q-21.963 27.679-21.668 27.559Q-21.372 27.439-21.054 27.439Q-20.726 27.439-20.464 27.539Q-20.203 27.638-20.027 27.820Q-19.851 28.003-19.757 28.261Q-19.663 28.519-19.663 28.851Q-19.663 28.943-19.745 28.964L-22.001 28.964L-22.001 29.025Q-22.001 29.613-21.717 29.996Q-21.433 30.379-20.866 30.379Q-20.545 30.379-20.277 30.186Q-20.008 29.993-19.919 29.678Q-19.912 29.637-19.837 29.623L-19.745 29.623Q-19.663 29.647-19.663 29.719Q-19.663 29.726-19.670 29.753Q-19.783 30.150-20.153 30.389Q-20.524 30.628-20.948 30.628Q-21.386 30.628-21.786 30.420Q-22.185 30.211-22.425 29.844Q-22.664 29.477-22.664 29.025M-21.994 28.755L-20.179 28.755Q-20.179 28.478-20.277 28.226Q-20.374 27.973-20.572 27.817Q-20.770 27.662-21.054 27.662Q-21.331 27.662-21.545 27.820Q-21.758 27.979-21.876 28.234Q-21.994 28.489-21.994 28.755M-19.075 29.049Q-19.075 28.721-18.940 28.420Q-18.805 28.120-18.569 27.899Q-18.333 27.679-18.029 27.559Q-17.725 27.439-17.400 27.439Q-16.894 27.439-16.546 27.542Q-16.197 27.644-16.197 28.020Q-16.197 28.167-16.295 28.268Q-16.392 28.369-16.539 28.369Q-16.693 28.369-16.792 28.270Q-16.891 28.171-16.891 28.020Q-16.891 27.832-16.751 27.740Q-16.953 27.689-17.393 27.689Q-17.749 27.689-17.978 27.885Q-18.207 28.082-18.308 28.391Q-18.409 28.701-18.409 29.049Q-18.409 29.398-18.282 29.704Q-18.156 30.010-17.901 30.194Q-17.646 30.379-17.291 30.379Q-17.069 30.379-16.884 30.295Q-16.700 30.211-16.565 30.056Q-16.430 29.900-16.371 29.692Q-16.358 29.637-16.303 29.637L-16.190 29.637Q-16.160 29.637-16.137 29.661Q-16.115 29.685-16.115 29.719L-16.115 29.740Q-16.201 30.027-16.389 30.225Q-16.577 30.423-16.841 30.526Q-17.106 30.628-17.400 30.628Q-17.831 30.628-18.219 30.422Q-18.607 30.215-18.841 29.852Q-19.075 29.490-19.075 29.049M-15.568 29.077Q-15.568 28.735-15.433 28.436Q-15.298 28.137-15.059 27.913Q-14.820 27.689-14.502 27.564Q-14.184 27.439-13.852 27.439Q-13.408 27.439-13.008 27.655Q-12.608 27.870-12.374 28.248Q-12.140 28.625-12.140 29.077Q-12.140 29.418-12.282 29.702Q-12.424 29.986-12.668 30.193Q-12.912 30.399-13.222 30.514Q-13.531 30.628-13.852 30.628Q-14.283 30.628-14.685 30.427Q-15.086 30.225-15.327 29.873Q-15.568 29.521-15.568 29.077M-13.852 30.379Q-13.251 30.379-13.027 30.001Q-12.803 29.623-12.803 28.991Q-12.803 28.379-13.037 28.020Q-13.271 27.662-13.852 27.662Q-14.905 27.662-14.905 28.991Q-14.905 29.623-14.680 30.001Q-14.454 30.379-13.852 30.379M-10.971 29.726L-10.971 28.222Q-10.971 27.952-11.079 27.891Q-11.186 27.829-11.497 27.829L-11.497 27.549L-10.390 27.474L-10.390 29.706L-10.390 29.726Q-10.390 30.006-10.339 30.150Q-10.287 30.293-10.146 30.350Q-10.004 30.406-9.717 30.406Q-9.464 30.406-9.259 30.266Q-9.054 30.126-8.937 29.900Q-8.821 29.675-8.821 29.425L-8.821 28.222Q-8.821 27.952-8.929 27.891Q-9.037 27.829-9.348 27.829L-9.348 27.549L-8.240 27.474L-8.240 29.887Q-8.240 30.078-8.187 30.160Q-8.134 30.242-8.033 30.261Q-7.933 30.280-7.717 30.280L-7.717 30.560L-8.794 30.628L-8.794 30.064Q-8.903 30.246-9.048 30.369Q-9.194 30.492-9.380 30.560Q-9.566 30.628-9.768 30.628Q-10.971 30.628-10.971 29.726M-5.448 30.560L-7.081 30.560L-7.081 30.280Q-6.852 30.280-6.704 30.246Q-6.555 30.211-6.555 30.071L-6.555 28.222Q-6.555 27.952-6.663 27.891Q-6.770 27.829-7.081 27.829L-7.081 27.549L-6.022 27.474L-6.022 28.123Q-5.851 27.815-5.547 27.644Q-5.243 27.474-4.897 27.474Q-4.391 27.474-4.108 27.697Q-3.824 27.921-3.824 28.417L-3.824 30.071Q-3.824 30.208-3.675 30.244Q-3.527 30.280-3.301 30.280L-3.301 30.560L-4.932 30.560L-4.932 30.280Q-4.703 30.280-4.554 30.246Q-4.405 30.211-4.405 30.071L-4.405 28.431Q-4.405 28.096-4.525 27.896Q-4.644 27.696-4.959 27.696Q-5.229 27.696-5.463 27.832Q-5.697 27.969-5.836 28.203Q-5.974 28.437-5.974 28.711L-5.974 30.071Q-5.974 30.208-5.824 30.244Q-5.673 30.280-5.448 30.280\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(78.066 -78.079)\">\u003Cpath d=\"M-2.376 29.719L-2.376 27.822L-3.015 27.822L-3.015 27.600Q-2.697 27.600-2.480 27.390Q-2.263 27.180-2.163 26.870Q-2.062 26.561-2.062 26.253L-1.795 26.253L-1.795 27.542L-0.718 27.542L-0.718 27.822L-1.795 27.822L-1.795 29.706Q-1.795 29.982-1.691 30.181Q-1.587 30.379-1.327 30.379Q-1.170 30.379-1.064 30.275Q-0.958 30.170-0.908 30.017Q-0.859 29.863-0.859 29.706L-0.859 29.292L-0.592 29.292L-0.592 29.719Q-0.592 29.945-0.691 30.155Q-0.790 30.365-0.975 30.497Q-1.159 30.628-1.388 30.628Q-1.826 30.628-2.101 30.391Q-2.376 30.153-2.376 29.719\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cpath fill=\"none\" d=\"M127.587-3.184c0 5.291-153.645 10.981-153.645 20.163\"\u002F>\u003Cpath stroke=\"none\" d=\"m-26.058 18.979 1.6-3.2-1.6 1.2-1.6-1.2\"\u002F>\u003Cg stroke=\"none\" font-family=\"cmr7\" font-size=\"7\">\u003Cg transform=\"translate(78.066 -32.555)\">\u003Cpath d=\"M-23.994 30.560L-25.730 30.560L-25.730 30.280Q-25.501 30.280-25.352 30.246Q-25.204 30.211-25.204 30.071L-25.204 28.222Q-25.204 27.952-25.311 27.891Q-25.419 27.829-25.730 27.829L-25.730 27.549L-24.701 27.474L-24.701 28.181Q-24.571 27.873-24.329 27.674Q-24.086 27.474-23.768 27.474Q-23.549 27.474-23.378 27.598Q-23.207 27.723-23.207 27.935Q-23.207 28.072-23.307 28.171Q-23.406 28.270-23.539 28.270Q-23.676 28.270-23.775 28.171Q-23.874 28.072-23.874 27.935Q-23.874 27.795-23.775 27.696Q-24.065 27.696-24.265 27.892Q-24.465 28.089-24.558 28.383Q-24.650 28.677-24.650 28.957L-24.650 30.071Q-24.650 30.280-23.994 30.280L-23.994 30.560M-22.664 29.025Q-22.664 28.704-22.539 28.415Q-22.414 28.126-22.189 27.903Q-21.963 27.679-21.668 27.559Q-21.372 27.439-21.054 27.439Q-20.726 27.439-20.464 27.539Q-20.203 27.638-20.027 27.820Q-19.851 28.003-19.757 28.261Q-19.663 28.519-19.663 28.851Q-19.663 28.943-19.745 28.964L-22.001 28.964L-22.001 29.025Q-22.001 29.613-21.717 29.996Q-21.433 30.379-20.866 30.379Q-20.545 30.379-20.277 30.186Q-20.008 29.993-19.919 29.678Q-19.912 29.637-19.837 29.623L-19.745 29.623Q-19.663 29.647-19.663 29.719Q-19.663 29.726-19.670 29.753Q-19.783 30.150-20.153 30.389Q-20.524 30.628-20.948 30.628Q-21.386 30.628-21.786 30.420Q-22.185 30.211-22.425 29.844Q-22.664 29.477-22.664 29.025M-21.994 28.755L-20.179 28.755Q-20.179 28.478-20.277 28.226Q-20.374 27.973-20.572 27.817Q-20.770 27.662-21.054 27.662Q-21.331 27.662-21.545 27.820Q-21.758 27.979-21.876 28.234Q-21.994 28.489-21.994 28.755M-19.075 29.049Q-19.075 28.721-18.940 28.420Q-18.805 28.120-18.569 27.899Q-18.333 27.679-18.029 27.559Q-17.725 27.439-17.400 27.439Q-16.894 27.439-16.546 27.542Q-16.197 27.644-16.197 28.020Q-16.197 28.167-16.295 28.268Q-16.392 28.369-16.539 28.369Q-16.693 28.369-16.792 28.270Q-16.891 28.171-16.891 28.020Q-16.891 27.832-16.751 27.740Q-16.953 27.689-17.393 27.689Q-17.749 27.689-17.978 27.885Q-18.207 28.082-18.308 28.391Q-18.409 28.701-18.409 29.049Q-18.409 29.398-18.282 29.704Q-18.156 30.010-17.901 30.194Q-17.646 30.379-17.291 30.379Q-17.069 30.379-16.884 30.295Q-16.700 30.211-16.565 30.056Q-16.430 29.900-16.371 29.692Q-16.358 29.637-16.303 29.637L-16.190 29.637Q-16.160 29.637-16.137 29.661Q-16.115 29.685-16.115 29.719L-16.115 29.740Q-16.201 30.027-16.389 30.225Q-16.577 30.423-16.841 30.526Q-17.106 30.628-17.400 30.628Q-17.831 30.628-18.219 30.422Q-18.607 30.215-18.841 29.852Q-19.075 29.490-19.075 29.049M-15.568 29.077Q-15.568 28.735-15.433 28.436Q-15.298 28.137-15.059 27.913Q-14.820 27.689-14.502 27.564Q-14.184 27.439-13.852 27.439Q-13.408 27.439-13.008 27.655Q-12.608 27.870-12.374 28.248Q-12.140 28.625-12.140 29.077Q-12.140 29.418-12.282 29.702Q-12.424 29.986-12.668 30.193Q-12.912 30.399-13.222 30.514Q-13.531 30.628-13.852 30.628Q-14.283 30.628-14.685 30.427Q-15.086 30.225-15.327 29.873Q-15.568 29.521-15.568 29.077M-13.852 30.379Q-13.251 30.379-13.027 30.001Q-12.803 29.623-12.803 28.991Q-12.803 28.379-13.037 28.020Q-13.271 27.662-13.852 27.662Q-14.905 27.662-14.905 28.991Q-14.905 29.623-14.680 30.001Q-14.454 30.379-13.852 30.379M-10.971 29.726L-10.971 28.222Q-10.971 27.952-11.079 27.891Q-11.186 27.829-11.497 27.829L-11.497 27.549L-10.390 27.474L-10.390 29.706L-10.390 29.726Q-10.390 30.006-10.339 30.150Q-10.287 30.293-10.146 30.350Q-10.004 30.406-9.717 30.406Q-9.464 30.406-9.259 30.266Q-9.054 30.126-8.937 29.900Q-8.821 29.675-8.821 29.425L-8.821 28.222Q-8.821 27.952-8.929 27.891Q-9.037 27.829-9.348 27.829L-9.348 27.549L-8.240 27.474L-8.240 29.887Q-8.240 30.078-8.187 30.160Q-8.134 30.242-8.033 30.261Q-7.933 30.280-7.717 30.280L-7.717 30.560L-8.794 30.628L-8.794 30.064Q-8.903 30.246-9.048 30.369Q-9.194 30.492-9.380 30.560Q-9.566 30.628-9.768 30.628Q-10.971 30.628-10.971 29.726M-5.448 30.560L-7.081 30.560L-7.081 30.280Q-6.852 30.280-6.704 30.246Q-6.555 30.211-6.555 30.071L-6.555 28.222Q-6.555 27.952-6.663 27.891Q-6.770 27.829-7.081 27.829L-7.081 27.549L-6.022 27.474L-6.022 28.123Q-5.851 27.815-5.547 27.644Q-5.243 27.474-4.897 27.474Q-4.391 27.474-4.108 27.697Q-3.824 27.921-3.824 28.417L-3.824 30.071Q-3.824 30.208-3.675 30.244Q-3.527 30.280-3.301 30.280L-3.301 30.560L-4.932 30.560L-4.932 30.280Q-4.703 30.280-4.554 30.246Q-4.405 30.211-4.405 30.071L-4.405 28.431Q-4.405 28.096-4.525 27.896Q-4.644 27.696-4.959 27.696Q-5.229 27.696-5.463 27.832Q-5.697 27.969-5.836 28.203Q-5.974 28.437-5.974 28.711L-5.974 30.071Q-5.974 30.208-5.824 30.244Q-5.673 30.280-5.448 30.280\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(78.066 -32.555)\">\u003Cpath d=\"M-2.376 29.719L-2.376 27.822L-3.015 27.822L-3.015 27.600Q-2.697 27.600-2.480 27.390Q-2.263 27.180-2.163 26.870Q-2.062 26.561-2.062 26.253L-1.795 26.253L-1.795 27.542L-0.718 27.542L-0.718 27.822L-1.795 27.822L-1.795 29.706Q-1.795 29.982-1.691 30.181Q-1.587 30.379-1.327 30.379Q-1.170 30.379-1.064 30.275Q-0.958 30.170-0.908 30.017Q-0.859 29.863-0.859 29.706L-0.859 29.292L-0.592 29.292L-0.592 29.719Q-0.592 29.945-0.691 30.155Q-0.790 30.365-0.975 30.497Q-1.159 30.628-1.388 30.628Q-1.826 30.628-2.101 30.391Q-2.376 30.153-2.376 29.719\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003C\u002Fg>\u003C\u002Fsvg>\u003Cfigcaption class=\"tikz-cap\">The first three BPE merges on the corpus low\u002Flowest\u002Fnewer\u002Fwider\u002Fnew. The most frequent adjacent pair is merged into a single symbol, added to the vocabulary, and rewritten throughout the corpus, then the count repeats.\u003C\u002Ffigcaption>","\u003Csvg style=\"width:100%;max-width:270.135px;height:auto\" xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" viewBox=\"-75 -75 202.601 109.270\">\u003Cg stroke=\"currentColor\" style=\"stroke-miterlimit:10;stroke-width:.4\">\u003Cg stroke=\"none\">\u003Cg transform=\"translate(3.533 -82.914)\">\u003Cpath d=\"M-68.688 18.628L-68.688 18.538Q-68.637 18.331-68.442 18.307L-67.336 18.307L-67.336 14.538L-68.442 14.538Q-68.637 14.514-68.688 14.300L-68.688 14.210Q-68.637 14.003-68.442 13.979L-66.946 13.979Q-66.754 14.003-66.696 14.210L-66.696 18.307L-65.594 18.307Q-65.395 18.331-65.344 18.538L-65.344 18.628Q-65.395 18.843-65.594 18.866L-68.442 18.866Q-68.637 18.843-68.688 18.628\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -82.914)\">\u003Cpath d=\"M-58.516 18.905Q-58.989 18.905-59.373 18.661Q-59.758 18.417-59.981 18.007Q-60.203 17.596-60.203 17.139Q-60.203 16.796-60.078 16.473Q-59.953 16.151-59.723 15.897Q-59.492 15.643-59.186 15.499Q-58.879 15.354-58.516 15.354Q-58.153 15.354-57.840 15.501Q-57.528 15.647-57.305 15.893Q-57.082 16.139-56.955 16.460Q-56.828 16.780-56.828 17.139Q-56.828 17.596-57.053 18.009Q-57.278 18.421-57.662 18.663Q-58.047 18.905-58.516 18.905M-58.516 18.346Q-58.051 18.346-57.760 17.952Q-57.469 17.557-57.469 17.073Q-57.469 16.780-57.604 16.512Q-57.739 16.245-57.979 16.079Q-58.219 15.913-58.516 15.913Q-58.821 15.913-59.059 16.079Q-59.297 16.245-59.432 16.512Q-59.567 16.780-59.567 17.073Q-59.567 17.553-59.274 17.950Q-58.981 18.346-58.516 18.346\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -82.914)\">\u003Cpath d=\"M-51.128 18.643L-51.593 15.979L-51.753 15.979Q-51.960 15.956-51.999 15.737L-51.999 15.651Q-51.960 15.440-51.753 15.417L-50.585 15.417Q-50.374 15.440-50.335 15.651L-50.335 15.737Q-50.374 15.956-50.585 15.979L-51.058 15.979Q-50.945 16.624-50.866 17.069Q-50.788 17.514-50.738 17.833Q-50.687 18.151-50.687 18.225Q-50.679 18.053-50.394 17.057Q-50.355 16.944-50.257 16.870Q-50.159 16.796-50.038 16.796L-49.960 16.796Q-49.839 16.796-49.741 16.870Q-49.644 16.944-49.609 17.057Q-49.499 17.440-49.417 17.764Q-49.335 18.089-49.335 18.225Q-49.324 17.936-48.976 15.979L-49.449 15.979Q-49.656 15.956-49.695 15.737L-49.695 15.651Q-49.656 15.440-49.449 15.417L-48.273 15.417Q-48.081 15.440-48.023 15.651L-48.023 15.737Q-48.077 15.956-48.273 15.979L-48.441 15.979L-48.906 18.643Q-48.929 18.761-49.017 18.833Q-49.105 18.905-49.226 18.905L-49.366 18.905Q-49.488 18.905-49.583 18.833Q-49.679 18.761-49.722 18.643Q-49.769 18.464-49.841 18.208Q-49.913 17.952-49.956 17.743Q-49.999 17.534-49.999 17.432Q-50.007 17.714-50.288 18.643Q-50.316 18.753-50.413 18.829Q-50.511 18.905-50.632 18.905L-50.808 18.905Q-50.929 18.905-51.017 18.833Q-51.105 18.761-51.128 18.643\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -82.914)\">\u003Cpath d=\"M-40.124 17.378L-42.566 17.378Q-42.511 17.655-42.314 17.878Q-42.116 18.100-41.839 18.223Q-41.562 18.346-41.277 18.346Q-40.804 18.346-40.581 18.057Q-40.574 18.046-40.517 17.940Q-40.460 17.835-40.411 17.792Q-40.363 17.749-40.269 17.737L-40.124 17.737Q-39.933 17.757-39.874 17.971L-39.874 18.026Q-39.941 18.327-40.171 18.524Q-40.402 18.721-40.714 18.813Q-41.027 18.905-41.331 18.905Q-41.816 18.905-42.255 18.677Q-42.695 18.448-42.962 18.048Q-43.230 17.647-43.230 17.155L-43.230 17.096Q-43.230 16.628-42.984 16.225Q-42.738 15.823-42.329 15.589Q-41.921 15.354-41.452 15.354Q-40.949 15.354-40.595 15.577Q-40.241 15.800-40.058 16.188Q-39.874 16.577-39.874 17.081L-39.874 17.139Q-39.933 17.354-40.124 17.378M-42.558 16.827L-40.531 16.827Q-40.577 16.417-40.816 16.165Q-41.054 15.913-41.452 15.913Q-41.847 15.913-42.154 16.175Q-42.460 16.436-42.558 16.827\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -82.914)\">\u003Cpath d=\"M-34.913 18.628L-34.913 18.538Q-34.855 18.331-34.663 18.307L-33.952 18.307L-33.952 15.979L-34.663 15.979Q-34.859 15.956-34.913 15.737L-34.913 15.651Q-34.855 15.440-34.663 15.417L-33.562 15.417Q-33.363 15.436-33.312 15.651L-33.312 15.979Q-33.050 15.694-32.695 15.536Q-32.339 15.378-31.952 15.378Q-31.659 15.378-31.425 15.512Q-31.191 15.647-31.191 15.913Q-31.191 16.081-31.300 16.198Q-31.409 16.315-31.577 16.315Q-31.730 16.315-31.845 16.204Q-31.960 16.093-31.960 15.936Q-32.335 15.936-32.650 16.137Q-32.964 16.339-33.138 16.673Q-33.312 17.007-33.312 17.386L-33.312 18.307L-32.366 18.307Q-32.159 18.331-32.120 18.538L-32.120 18.628Q-32.159 18.843-32.366 18.866L-34.663 18.866Q-34.855 18.843-34.913 18.628\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cpath d=\"M-22.593-64.448h2.55v.4h-2.55z\"\u002F>\u003C\u002Fg>\u003Cg stroke=\"none\" font-family=\"cmr7\" font-size=\"7\">\u003Cg transform=\"translate(128.725 -82.928)\">\u003Cpath d=\"M-68.823 18.859L-68.823 17.796Q-68.823 17.772-68.795 17.745Q-68.768 17.718-68.744 17.718L-68.635 17.718Q-68.570 17.718-68.556 17.776Q-68.460 18.210-68.214 18.461Q-67.968 18.712-67.554 18.712Q-67.213 18.712-66.960 18.579Q-66.707 18.446-66.707 18.138Q-66.707 17.981-66.801 17.866Q-66.895 17.752-67.033 17.683Q-67.172 17.615-67.339 17.577L-67.920 17.478Q-68.276 17.410-68.549 17.189Q-68.823 16.969-68.823 16.627Q-68.823 16.378-68.711 16.203Q-68.600 16.029-68.414 15.930Q-68.228 15.831-68.012 15.788Q-67.797 15.745-67.554 15.745Q-67.141 15.745-66.861 15.927L-66.645 15.752Q-66.635 15.749-66.628 15.747Q-66.621 15.745-66.611 15.745L-66.560 15.745Q-66.533 15.745-66.509 15.769Q-66.485 15.793-66.485 15.821L-66.485 16.668Q-66.485 16.689-66.509 16.716Q-66.533 16.743-66.560 16.743L-66.673 16.743Q-66.700 16.743-66.726 16.718Q-66.751 16.692-66.751 16.668Q-66.751 16.432-66.857 16.268Q-66.963 16.104-67.146 16.022Q-67.329 15.940-67.561 15.940Q-67.889 15.940-68.146 16.043Q-68.402 16.145-68.402 16.422Q-68.402 16.617-68.219 16.726Q-68.036 16.836-67.807 16.877L-67.233 16.983Q-66.987 17.031-66.773 17.159Q-66.560 17.287-66.423 17.490Q-66.286 17.694-66.286 17.943Q-66.286 18.456-66.652 18.695Q-67.018 18.934-67.554 18.934Q-68.050 18.934-68.382 18.640L-68.648 18.914Q-68.669 18.934-68.696 18.934L-68.744 18.934Q-68.768 18.934-68.795 18.907Q-68.823 18.880-68.823 18.859M-65.131 18.025L-65.131 16.128L-65.770 16.128L-65.770 15.906Q-65.452 15.906-65.235 15.696Q-65.018 15.486-64.918 15.176Q-64.817 14.867-64.817 14.559L-64.550 14.559L-64.550 15.848L-63.473 15.848L-63.473 16.128L-64.550 16.128L-64.550 18.012Q-64.550 18.288-64.446 18.487Q-64.342 18.685-64.082 18.685Q-63.925 18.685-63.819 18.581Q-63.713 18.476-63.663 18.323Q-63.614 18.169-63.614 18.012L-63.614 17.598L-63.347 17.598L-63.347 18.025Q-63.347 18.251-63.446 18.461Q-63.545 18.671-63.730 18.803Q-63.914 18.934-64.143 18.934Q-64.581 18.934-64.856 18.697Q-65.131 18.459-65.131 18.025M-62.479 18.138Q-62.479 17.806-62.255 17.579Q-62.031 17.352-61.688 17.224Q-61.344 17.095-60.971 17.043Q-60.599 16.990-60.295 16.990L-60.295 16.737Q-60.295 16.532-60.402 16.352Q-60.510 16.173-60.691 16.070Q-60.872 15.968-61.081 15.968Q-61.488 15.968-61.723 16.060Q-61.635 16.097-61.588 16.181Q-61.542 16.265-61.542 16.367Q-61.542 16.463-61.588 16.542Q-61.635 16.620-61.715 16.665Q-61.795 16.709-61.884 16.709Q-62.034 16.709-62.135 16.612Q-62.236 16.514-62.236 16.367Q-62.236 15.745-61.081 15.745Q-60.869 15.745-60.619 15.809Q-60.370 15.872-60.168 15.991Q-59.967 16.111-59.840 16.296Q-59.714 16.480-59.714 16.723L-59.714 18.299Q-59.714 18.415-59.652 18.511Q-59.591 18.606-59.478 18.606Q-59.368 18.606-59.304 18.512Q-59.239 18.418-59.239 18.299L-59.239 17.851L-58.972 17.851L-58.972 18.299Q-58.972 18.569-59.199 18.734Q-59.427 18.900-59.707 18.900Q-59.915 18.900-60.052 18.746Q-60.189 18.593-60.213 18.377Q-60.360 18.644-60.642 18.789Q-60.924 18.934-61.248 18.934Q-61.525 18.934-61.809 18.859Q-62.093 18.784-62.286 18.605Q-62.479 18.425-62.479 18.138M-61.864 18.138Q-61.864 18.312-61.763 18.442Q-61.662 18.572-61.506 18.642Q-61.351 18.712-61.187 18.712Q-60.968 18.712-60.760 18.615Q-60.551 18.517-60.423 18.336Q-60.295 18.155-60.295 17.929L-60.295 17.201Q-60.619 17.201-60.985 17.292Q-61.351 17.383-61.607 17.595Q-61.864 17.806-61.864 18.138M-56.805 18.866L-58.541 18.866L-58.541 18.586Q-58.312 18.586-58.164 18.552Q-58.015 18.517-58.015 18.377L-58.015 16.528Q-58.015 16.258-58.123 16.197Q-58.230 16.135-58.541 16.135L-58.541 15.855L-57.512 15.780L-57.512 16.487Q-57.383 16.179-57.140 15.980Q-56.897 15.780-56.579 15.780Q-56.361 15.780-56.190 15.904Q-56.019 16.029-56.019 16.241Q-56.019 16.378-56.118 16.477Q-56.217 16.576-56.350 16.576Q-56.487 16.576-56.586 16.477Q-56.685 16.378-56.685 16.241Q-56.685 16.101-56.586 16.002Q-56.877 16.002-57.077 16.198Q-57.277 16.395-57.369 16.689Q-57.461 16.983-57.461 17.263L-57.461 18.377Q-57.461 18.586-56.805 18.586L-56.805 18.866M-54.908 18.025L-54.908 16.128L-55.547 16.128L-55.547 15.906Q-55.229 15.906-55.012 15.696Q-54.795 15.486-54.694 15.176Q-54.594 14.867-54.594 14.559L-54.327 14.559L-54.327 15.848L-53.250 15.848L-53.250 16.128L-54.327 16.128L-54.327 18.012Q-54.327 18.288-54.223 18.487Q-54.118 18.685-53.859 18.685Q-53.701 18.685-53.595 18.581Q-53.490 18.476-53.440 18.323Q-53.390 18.169-53.390 18.012L-53.390 17.598L-53.124 17.598L-53.124 18.025Q-53.124 18.251-53.223 18.461Q-53.322 18.671-53.507 18.803Q-53.691 18.934-53.920 18.934Q-54.358 18.934-54.633 18.697Q-54.908 18.459-54.908 18.025M-51.914 18.446Q-51.914 18.278-51.791 18.155Q-51.668 18.032-51.493 18.032Q-51.326 18.032-51.203 18.155Q-51.080 18.278-51.080 18.446Q-51.080 18.620-51.203 18.743Q-51.326 18.866-51.493 18.866Q-51.668 18.866-51.791 18.743Q-51.914 18.620-51.914 18.446M-51.914 16.262Q-51.914 16.094-51.791 15.971Q-51.668 15.848-51.493 15.848Q-51.326 15.848-51.203 15.971Q-51.080 16.094-51.080 16.262Q-51.080 16.436-51.203 16.559Q-51.326 16.682-51.493 16.682Q-51.668 16.682-51.791 16.559Q-51.914 16.436-51.914 16.262\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(128.725 -82.928)\">\u003Cpath d=\"M-46.474 17.355Q-46.474 17.027-46.339 16.726Q-46.204 16.426-45.968 16.205Q-45.732 15.985-45.428 15.865Q-45.123 15.745-44.799 15.745Q-44.293 15.745-43.944 15.848Q-43.596 15.950-43.596 16.326Q-43.596 16.473-43.693 16.574Q-43.790 16.675-43.937 16.675Q-44.091 16.675-44.190 16.576Q-44.289 16.477-44.289 16.326Q-44.289 16.138-44.149 16.046Q-44.351 15.995-44.792 15.995Q-45.147 15.995-45.376 16.191Q-45.605 16.388-45.706 16.697Q-45.807 17.007-45.807 17.355Q-45.807 17.704-45.681 18.010Q-45.554 18.316-45.299 18.500Q-45.045 18.685-44.689 18.685Q-44.467 18.685-44.283 18.601Q-44.098 18.517-43.963 18.362Q-43.828 18.206-43.770 17.998Q-43.756 17.943-43.702 17.943L-43.589 17.943Q-43.558 17.943-43.536 17.967Q-43.514 17.991-43.514 18.025L-43.514 18.046Q-43.599 18.333-43.787 18.531Q-43.975 18.729-44.240 18.832Q-44.505 18.934-44.799 18.934Q-45.229 18.934-45.617 18.728Q-46.005 18.521-46.239 18.158Q-46.474 17.796-46.474 17.355\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(128.725 -82.928)\">\u003Cpath d=\"M-41.452 18.866L-43.086 18.866L-43.086 18.586Q-42.857 18.586-42.708 18.552Q-42.559 18.517-42.559 18.377L-42.559 14.758Q-42.559 14.488-42.667 14.426Q-42.775 14.365-43.086 14.365L-43.086 14.084L-42.006 14.009L-42.006 16.395Q-41.900 16.210-41.722 16.068Q-41.544 15.927-41.336 15.853Q-41.127 15.780-40.902 15.780Q-40.396 15.780-40.112 16.003Q-39.828 16.227-39.828 16.723L-39.828 18.377Q-39.828 18.514-39.680 18.550Q-39.531 18.586-39.305 18.586L-39.305 18.866L-40.936 18.866L-40.936 18.586Q-40.707 18.586-40.558 18.552Q-40.409 18.517-40.409 18.377L-40.409 16.737Q-40.409 16.402-40.529 16.202Q-40.649 16.002-40.963 16.002Q-41.233 16.002-41.467 16.138Q-41.701 16.275-41.840 16.509Q-41.978 16.743-41.978 17.017L-41.978 18.377Q-41.978 18.514-41.828 18.550Q-41.677 18.586-41.452 18.586L-41.452 18.866M-38.659 18.138Q-38.659 17.806-38.436 17.579Q-38.212 17.352-37.868 17.224Q-37.525 17.095-37.152 17.043Q-36.780 16.990-36.475 16.990L-36.475 16.737Q-36.475 16.532-36.583 16.352Q-36.691 16.173-36.872 16.070Q-37.053 15.968-37.261 15.968Q-37.668 15.968-37.904 16.060Q-37.815 16.097-37.769 16.181Q-37.723 16.265-37.723 16.367Q-37.723 16.463-37.769 16.542Q-37.815 16.620-37.896 16.665Q-37.976 16.709-38.065 16.709Q-38.215 16.709-38.316 16.612Q-38.417 16.514-38.417 16.367Q-38.417 15.745-37.261 15.745Q-37.050 15.745-36.800 15.809Q-36.551 15.872-36.349 15.991Q-36.147 16.111-36.021 16.296Q-35.894 16.480-35.894 16.723L-35.894 18.299Q-35.894 18.415-35.833 18.511Q-35.771 18.606-35.658 18.606Q-35.549 18.606-35.484 18.512Q-35.419 18.418-35.419 18.299L-35.419 17.851L-35.153 17.851L-35.153 18.299Q-35.153 18.569-35.380 18.734Q-35.607 18.900-35.887 18.900Q-36.096 18.900-36.233 18.746Q-36.369 18.593-36.393 18.377Q-36.540 18.644-36.822 18.789Q-37.104 18.934-37.429 18.934Q-37.706 18.934-37.990 18.859Q-38.273 18.784-38.466 18.605Q-38.659 18.425-38.659 18.138M-38.044 18.138Q-38.044 18.312-37.943 18.442Q-37.843 18.572-37.687 18.642Q-37.531 18.712-37.367 18.712Q-37.149 18.712-36.940 18.615Q-36.732 18.517-36.604 18.336Q-36.475 18.155-36.475 17.929L-36.475 17.201Q-36.800 17.201-37.166 17.292Q-37.531 17.383-37.788 17.595Q-38.044 17.806-38.044 18.138M-32.986 18.866L-34.722 18.866L-34.722 18.586Q-34.493 18.586-34.344 18.552Q-34.196 18.517-34.196 18.377L-34.196 16.528Q-34.196 16.258-34.303 16.197Q-34.411 16.135-34.722 16.135L-34.722 15.855L-33.693 15.780L-33.693 16.487Q-33.563 16.179-33.321 15.980Q-33.078 15.780-32.760 15.780Q-32.541 15.780-32.370 15.904Q-32.199 16.029-32.199 16.241Q-32.199 16.378-32.299 16.477Q-32.398 16.576-32.531 16.576Q-32.668 16.576-32.767 16.477Q-32.866 16.378-32.866 16.241Q-32.866 16.101-32.767 16.002Q-33.057 16.002-33.257 16.198Q-33.457 16.395-33.550 16.689Q-33.642 16.983-33.642 17.263L-33.642 18.377Q-33.642 18.586-32.986 18.586L-32.986 18.866M-31.557 18.138Q-31.557 17.806-31.333 17.579Q-31.109 17.352-30.766 17.224Q-30.422 17.095-30.050 17.043Q-29.677 16.990-29.373 16.990L-29.373 16.737Q-29.373 16.532-29.480 16.352Q-29.588 16.173-29.769 16.070Q-29.950 15.968-30.159 15.968Q-30.566 15.968-30.802 16.060Q-30.713 16.097-30.667 16.181Q-30.620 16.265-30.620 16.367Q-30.620 16.463-30.667 16.542Q-30.713 16.620-30.793 16.665Q-30.873 16.709-30.962 16.709Q-31.113 16.709-31.213 16.612Q-31.314 16.514-31.314 16.367Q-31.314 15.745-30.159 15.745Q-29.947 15.745-29.698 15.809Q-29.448 15.872-29.246 15.991Q-29.045 16.111-28.918 16.296Q-28.792 16.480-28.792 16.723L-28.792 18.299Q-28.792 18.415-28.730 18.511Q-28.669 18.606-28.556 18.606Q-28.447 18.606-28.382 18.512Q-28.317 18.418-28.317 18.299L-28.317 17.851L-28.050 17.851L-28.050 18.299Q-28.050 18.569-28.277 18.734Q-28.505 18.900-28.785 18.900Q-28.993 18.900-29.130 18.746Q-29.267 18.593-29.291 18.377Q-29.438 18.644-29.720 18.789Q-30.002 18.934-30.326 18.934Q-30.603 18.934-30.887 18.859Q-31.171 18.784-31.364 18.605Q-31.557 18.425-31.557 18.138M-30.942 18.138Q-30.942 18.312-30.841 18.442Q-30.740 18.572-30.584 18.642Q-30.429 18.712-30.265 18.712Q-30.046 18.712-29.838 18.615Q-29.629 18.517-29.501 18.336Q-29.373 18.155-29.373 17.929L-29.373 17.201Q-29.698 17.201-30.063 17.292Q-30.429 17.383-30.685 17.595Q-30.942 17.806-30.942 18.138M-27.633 17.355Q-27.633 17.027-27.498 16.726Q-27.363 16.426-27.127 16.205Q-26.891 15.985-26.587 15.865Q-26.283 15.745-25.958 15.745Q-25.452 15.745-25.104 15.848Q-24.755 15.950-24.755 16.326Q-24.755 16.473-24.853 16.574Q-24.950 16.675-25.097 16.675Q-25.251 16.675-25.350 16.576Q-25.449 16.477-25.449 16.326Q-25.449 16.138-25.309 16.046Q-25.511 15.995-25.951 15.995Q-26.307 15.995-26.536 16.191Q-26.765 16.388-26.866 16.697Q-26.967 17.007-26.967 17.355Q-26.967 17.704-26.840 18.010Q-26.714 18.316-26.459 18.500Q-26.204 18.685-25.849 18.685Q-25.627 18.685-25.442 18.601Q-25.258 18.517-25.123 18.362Q-24.988 18.206-24.929 17.998Q-24.916 17.943-24.861 17.943L-24.748 17.943Q-24.718 17.943-24.695 17.967Q-24.673 17.991-24.673 18.025L-24.673 18.046Q-24.759 18.333-24.947 18.531Q-25.135 18.729-25.399 18.832Q-25.664 18.934-25.958 18.934Q-26.389 18.934-26.777 18.728Q-27.165 18.521-27.399 18.158Q-27.633 17.796-27.633 17.355M-23.559 18.025L-23.559 16.128L-24.198 16.128L-24.198 15.906Q-23.880 15.906-23.663 15.696Q-23.446 15.486-23.345 15.176Q-23.244 14.867-23.244 14.559L-22.978 14.559L-22.978 15.848L-21.901 15.848L-21.901 16.128L-22.978 16.128L-22.978 18.012Q-22.978 18.288-22.874 18.487Q-22.769 18.685-22.510 18.685Q-22.352 18.685-22.246 18.581Q-22.140 18.476-22.091 18.323Q-22.041 18.169-22.041 18.012L-22.041 17.598L-21.775 17.598L-21.775 18.025Q-21.775 18.251-21.874 18.461Q-21.973 18.671-22.157 18.803Q-22.342 18.934-22.571 18.934Q-23.009 18.934-23.284 18.697Q-23.559 18.459-23.559 18.025M-21.006 17.331Q-21.006 17.010-20.881 16.721Q-20.756 16.432-20.531 16.209Q-20.305 15.985-20.009 15.865Q-19.714 15.745-19.396 15.745Q-19.068 15.745-18.806 15.845Q-18.545 15.944-18.369 16.126Q-18.193 16.309-18.099 16.567Q-18.005 16.825-18.005 17.157Q-18.005 17.249-18.087 17.270L-20.343 17.270L-20.343 17.331Q-20.343 17.919-20.059 18.302Q-19.775 18.685-19.208 18.685Q-18.886 18.685-18.618 18.492Q-18.350 18.299-18.261 17.984Q-18.254 17.943-18.179 17.929L-18.087 17.929Q-18.005 17.953-18.005 18.025Q-18.005 18.032-18.011 18.059Q-18.124 18.456-18.495 18.695Q-18.866 18.934-19.290 18.934Q-19.727 18.934-20.127 18.726Q-20.527 18.517-20.766 18.150Q-21.006 17.783-21.006 17.331M-20.336 17.061L-18.521 17.061Q-18.521 16.784-18.618 16.532Q-18.716 16.279-18.914 16.123Q-19.112 15.968-19.396 15.968Q-19.673 15.968-19.886 16.126Q-20.100 16.285-20.218 16.540Q-20.336 16.795-20.336 17.061M-15.667 18.866L-17.403 18.866L-17.403 18.586Q-17.174 18.586-17.025 18.552Q-16.877 18.517-16.877 18.377L-16.877 16.528Q-16.877 16.258-16.984 16.197Q-17.092 16.135-17.403 16.135L-17.403 15.855L-16.374 15.780L-16.374 16.487Q-16.244 16.179-16.002 15.980Q-15.759 15.780-15.441 15.780Q-15.222 15.780-15.052 15.904Q-14.881 16.029-14.881 16.241Q-14.881 16.378-14.980 16.477Q-15.079 16.576-15.212 16.576Q-15.349 16.576-15.448 16.477Q-15.547 16.378-15.547 16.241Q-15.547 16.101-15.448 16.002Q-15.739 16.002-15.938 16.198Q-16.138 16.395-16.231 16.689Q-16.323 16.983-16.323 17.263L-16.323 18.377Q-16.323 18.586-15.667 18.586L-15.667 18.866M-14.296 18.859L-14.296 17.796Q-14.296 17.772-14.269 17.745Q-14.241 17.718-14.218 17.718L-14.108 17.718Q-14.043 17.718-14.030 17.776Q-13.934 18.210-13.688 18.461Q-13.442 18.712-13.028 18.712Q-12.686 18.712-12.433 18.579Q-12.180 18.446-12.180 18.138Q-12.180 17.981-12.274 17.866Q-12.368 17.752-12.507 17.683Q-12.645 17.615-12.813 17.577L-13.394 17.478Q-13.749 17.410-14.023 17.189Q-14.296 16.969-14.296 16.627Q-14.296 16.378-14.185 16.203Q-14.074 16.029-13.888 15.930Q-13.701 15.831-13.486 15.788Q-13.271 15.745-13.028 15.745Q-12.615 15.745-12.334 15.927L-12.119 15.752Q-12.109 15.749-12.102 15.747Q-12.095 15.745-12.085 15.745L-12.033 15.745Q-12.006 15.745-11.982 15.769Q-11.958 15.793-11.958 15.821L-11.958 16.668Q-11.958 16.689-11.982 16.716Q-12.006 16.743-12.033 16.743L-12.146 16.743Q-12.174 16.743-12.199 16.718Q-12.225 16.692-12.225 16.668Q-12.225 16.432-12.331 16.268Q-12.437 16.104-12.620 16.022Q-12.802 15.940-13.035 15.940Q-13.363 15.940-13.619 16.043Q-13.876 16.145-13.876 16.422Q-13.876 16.617-13.693 16.726Q-13.510 16.836-13.281 16.877L-12.707 16.983Q-12.461 17.031-12.247 17.159Q-12.033 17.287-11.897 17.490Q-11.760 17.694-11.760 17.943Q-11.760 18.456-12.126 18.695Q-12.491 18.934-13.028 18.934Q-13.524 18.934-13.855 18.640L-14.122 18.914Q-14.142 18.934-14.170 18.934L-14.218 18.934Q-14.241 18.934-14.269 18.907Q-14.296 18.880-14.296 18.859\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cg stroke=\"none\">\u003Cg transform=\"translate(3.533 -60.151)\">\u003Cpath d=\"M-68.688 18.628L-68.688 18.538Q-68.637 18.331-68.442 18.307L-67.336 18.307L-67.336 14.538L-68.442 14.538Q-68.637 14.514-68.688 14.300L-68.688 14.210Q-68.637 14.003-68.442 13.979L-66.946 13.979Q-66.754 14.003-66.696 14.210L-66.696 18.307L-65.594 18.307Q-65.395 18.331-65.344 18.538L-65.344 18.628Q-65.395 18.843-65.594 18.866L-68.442 18.866Q-68.637 18.843-68.688 18.628\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -60.151)\">\u003Cpath d=\"M-58.516 18.905Q-58.989 18.905-59.373 18.661Q-59.758 18.417-59.981 18.007Q-60.203 17.596-60.203 17.139Q-60.203 16.796-60.078 16.473Q-59.953 16.151-59.723 15.897Q-59.492 15.643-59.186 15.499Q-58.879 15.354-58.516 15.354Q-58.153 15.354-57.840 15.501Q-57.528 15.647-57.305 15.893Q-57.082 16.139-56.955 16.460Q-56.828 16.780-56.828 17.139Q-56.828 17.596-57.053 18.009Q-57.278 18.421-57.662 18.663Q-58.047 18.905-58.516 18.905M-58.516 18.346Q-58.051 18.346-57.760 17.952Q-57.469 17.557-57.469 17.073Q-57.469 16.780-57.604 16.512Q-57.739 16.245-57.979 16.079Q-58.219 15.913-58.516 15.913Q-58.821 15.913-59.059 16.079Q-59.297 16.245-59.432 16.512Q-59.567 16.780-59.567 17.073Q-59.567 17.553-59.274 17.950Q-58.981 18.346-58.516 18.346\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -60.151)\">\u003Cpath d=\"M-51.128 18.643L-51.593 15.979L-51.753 15.979Q-51.960 15.956-51.999 15.737L-51.999 15.651Q-51.960 15.440-51.753 15.417L-50.585 15.417Q-50.374 15.440-50.335 15.651L-50.335 15.737Q-50.374 15.956-50.585 15.979L-51.058 15.979Q-50.945 16.624-50.866 17.069Q-50.788 17.514-50.738 17.833Q-50.687 18.151-50.687 18.225Q-50.679 18.053-50.394 17.057Q-50.355 16.944-50.257 16.870Q-50.159 16.796-50.038 16.796L-49.960 16.796Q-49.839 16.796-49.741 16.870Q-49.644 16.944-49.609 17.057Q-49.499 17.440-49.417 17.764Q-49.335 18.089-49.335 18.225Q-49.324 17.936-48.976 15.979L-49.449 15.979Q-49.656 15.956-49.695 15.737L-49.695 15.651Q-49.656 15.440-49.449 15.417L-48.273 15.417Q-48.081 15.440-48.023 15.651L-48.023 15.737Q-48.077 15.956-48.273 15.979L-48.441 15.979L-48.906 18.643Q-48.929 18.761-49.017 18.833Q-49.105 18.905-49.226 18.905L-49.366 18.905Q-49.488 18.905-49.583 18.833Q-49.679 18.761-49.722 18.643Q-49.769 18.464-49.841 18.208Q-49.913 17.952-49.956 17.743Q-49.999 17.534-49.999 17.432Q-50.007 17.714-50.288 18.643Q-50.316 18.753-50.413 18.829Q-50.511 18.905-50.632 18.905L-50.808 18.905Q-50.929 18.905-51.017 18.833Q-51.105 18.761-51.128 18.643\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -60.151)\">\u003Cpath d=\"M-40.124 17.378L-42.566 17.378Q-42.511 17.655-42.314 17.878Q-42.116 18.100-41.839 18.223Q-41.562 18.346-41.277 18.346Q-40.804 18.346-40.581 18.057Q-40.574 18.046-40.517 17.940Q-40.460 17.835-40.411 17.792Q-40.363 17.749-40.269 17.737L-40.124 17.737Q-39.933 17.757-39.874 17.971L-39.874 18.026Q-39.941 18.327-40.171 18.524Q-40.402 18.721-40.714 18.813Q-41.027 18.905-41.331 18.905Q-41.816 18.905-42.255 18.677Q-42.695 18.448-42.962 18.048Q-43.230 17.647-43.230 17.155L-43.230 17.096Q-43.230 16.628-42.984 16.225Q-42.738 15.823-42.329 15.589Q-41.921 15.354-41.452 15.354Q-40.949 15.354-40.595 15.577Q-40.241 15.800-40.058 16.188Q-39.874 16.577-39.874 17.081L-39.874 17.139Q-39.933 17.354-40.124 17.378M-42.558 16.827L-40.531 16.827Q-40.577 16.417-40.816 16.165Q-41.054 15.913-41.452 15.913Q-41.847 15.913-42.154 16.175Q-42.460 16.436-42.558 16.827M-39.167 18.628L-39.167 18.538Q-39.109 18.331-38.917 18.307L-38.206 18.307L-38.206 15.979L-38.917 15.979Q-39.113 15.956-39.167 15.737L-39.167 15.651Q-39.109 15.440-38.917 15.417L-37.816 15.417Q-37.616 15.436-37.566 15.651L-37.566 15.979Q-37.304 15.694-36.949 15.536Q-36.593 15.378-36.206 15.378Q-35.913 15.378-35.679 15.512Q-35.445 15.647-35.445 15.913Q-35.445 16.081-35.554 16.198Q-35.663 16.315-35.831 16.315Q-35.984 16.315-36.099 16.204Q-36.214 16.093-36.214 15.936Q-36.589 15.936-36.904 16.137Q-37.218 16.339-37.392 16.673Q-37.566 17.007-37.566 17.386L-37.566 18.307L-36.620 18.307Q-36.413 18.331-36.374 18.538L-36.374 18.628Q-36.413 18.843-36.620 18.866L-38.917 18.866Q-39.109 18.843-39.167 18.628\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cpath d=\"M-26.843-41.685h2.55v.4h-2.55z\"\u002F>\u003C\u002Fg>\u003Cg stroke=\"none\" font-family=\"cmr7\" font-size=\"7\">\u003Cg transform=\"translate(128.725 -60.846)\">\u003Cpath d=\"M-68.764 18.138Q-68.764 17.806-68.541 17.579Q-68.317 17.352-67.973 17.224Q-67.630 17.095-67.257 17.043Q-66.885 16.990-66.580 16.990L-66.580 16.737Q-66.580 16.532-66.688 16.352Q-66.796 16.173-66.977 16.070Q-67.158 15.968-67.366 15.968Q-67.773 15.968-68.009 16.060Q-67.920 16.097-67.874 16.181Q-67.828 16.265-67.828 16.367Q-67.828 16.463-67.874 16.542Q-67.920 16.620-68.001 16.665Q-68.081 16.709-68.170 16.709Q-68.320 16.709-68.421 16.612Q-68.522 16.514-68.522 16.367Q-68.522 15.745-67.366 15.745Q-67.155 15.745-66.905 15.809Q-66.656 15.872-66.454 15.991Q-66.252 16.111-66.126 16.296Q-65.999 16.480-65.999 16.723L-65.999 18.299Q-65.999 18.415-65.938 18.511Q-65.876 18.606-65.763 18.606Q-65.654 18.606-65.589 18.512Q-65.524 18.418-65.524 18.299L-65.524 17.851L-65.258 17.851L-65.258 18.299Q-65.258 18.569-65.485 18.734Q-65.712 18.900-65.992 18.900Q-66.201 18.900-66.338 18.746Q-66.474 18.593-66.498 18.377Q-66.645 18.644-66.927 18.789Q-67.209 18.934-67.534 18.934Q-67.811 18.934-68.095 18.859Q-68.378 18.784-68.571 18.605Q-68.764 18.425-68.764 18.138M-68.149 18.138Q-68.149 18.312-68.048 18.442Q-67.948 18.572-67.792 18.642Q-67.637 18.712-67.472 18.712Q-67.254 18.712-67.045 18.615Q-66.837 18.517-66.709 18.336Q-66.580 18.155-66.580 17.929L-66.580 17.201Q-66.905 17.201-67.271 17.292Q-67.637 17.383-67.893 17.595Q-68.149 17.806-68.149 18.138M-63.197 20.223L-64.827 20.223L-64.827 19.943Q-64.598 19.943-64.449 19.908Q-64.301 19.874-64.301 19.734L-64.301 16.388Q-64.301 16.217-64.437 16.176Q-64.574 16.135-64.827 16.135L-64.827 15.855L-63.747 15.780L-63.747 16.186Q-63.525 15.985-63.238 15.882Q-62.950 15.780-62.643 15.780Q-62.216 15.780-61.852 15.993Q-61.488 16.207-61.274 16.571Q-61.060 16.935-61.060 17.355Q-61.060 17.800-61.300 18.164Q-61.539 18.528-61.932 18.731Q-62.325 18.934-62.769 18.934Q-63.036 18.934-63.284 18.834Q-63.532 18.733-63.720 18.552L-63.720 19.734Q-63.720 19.871-63.571 19.907Q-63.422 19.943-63.197 19.943L-63.197 20.223M-63.720 16.535L-63.720 18.145Q-63.586 18.398-63.344 18.555Q-63.101 18.712-62.824 18.712Q-62.496 18.712-62.243 18.511Q-61.990 18.309-61.857 17.991Q-61.723 17.673-61.723 17.355Q-61.723 17.126-61.788 16.897Q-61.853 16.668-61.981 16.470Q-62.110 16.272-62.304 16.152Q-62.499 16.033-62.732 16.033Q-63.026 16.033-63.294 16.162Q-63.562 16.292-63.720 16.535M-58.781 20.223L-60.411 20.223L-60.411 19.943Q-60.182 19.943-60.033 19.908Q-59.885 19.874-59.885 19.734L-59.885 16.388Q-59.885 16.217-60.021 16.176Q-60.158 16.135-60.411 16.135L-60.411 15.855L-59.331 15.780L-59.331 16.186Q-59.109 15.985-58.822 15.882Q-58.534 15.780-58.227 15.780Q-57.800 15.780-57.436 15.993Q-57.072 16.207-56.858 16.571Q-56.644 16.935-56.644 17.355Q-56.644 17.800-56.884 18.164Q-57.123 18.528-57.516 18.731Q-57.909 18.934-58.353 18.934Q-58.620 18.934-58.868 18.834Q-59.116 18.733-59.304 18.552L-59.304 19.734Q-59.304 19.871-59.155 19.907Q-59.006 19.943-58.781 19.943L-58.781 20.223M-59.304 16.535L-59.304 18.145Q-59.170 18.398-58.928 18.555Q-58.685 18.712-58.408 18.712Q-58.080 18.712-57.827 18.511Q-57.574 18.309-57.441 17.991Q-57.307 17.673-57.307 17.355Q-57.307 17.126-57.372 16.897Q-57.437 16.668-57.565 16.470Q-57.694 16.272-57.888 16.152Q-58.083 16.033-58.316 16.033Q-58.610 16.033-58.878 16.162Q-59.146 16.292-59.304 16.535M-54.341 18.866L-55.944 18.866L-55.944 18.586Q-55.718 18.586-55.569 18.552Q-55.421 18.517-55.421 18.377L-55.421 14.758Q-55.421 14.488-55.528 14.426Q-55.636 14.365-55.944 14.365L-55.944 14.084L-54.867 14.009L-54.867 18.377Q-54.867 18.514-54.717 18.550Q-54.566 18.586-54.341 18.586L-54.341 18.866M-53.411 20.001Q-53.281 20.069-53.144 20.069Q-52.973 20.069-52.823 19.980Q-52.673 19.891-52.562 19.746Q-52.450 19.601-52.372 19.433L-52.109 18.866L-53.278 16.340Q-53.353 16.193-53.483 16.161Q-53.613 16.128-53.845 16.128L-53.845 15.848L-52.324 15.848L-52.324 16.128Q-52.673 16.128-52.673 16.275Q-52.669 16.296-52.668 16.313Q-52.666 16.330-52.666 16.340L-51.808 18.199L-51.035 16.528Q-51.001 16.460-51.001 16.381Q-51.001 16.268-51.085 16.198Q-51.169 16.128-51.282 16.128L-51.282 15.848L-50.085 15.848L-50.085 16.128Q-50.304 16.128-50.477 16.232Q-50.649 16.337-50.741 16.528L-52.078 19.433Q-52.249 19.803-52.519 20.049Q-52.789 20.295-53.144 20.295Q-53.414 20.295-53.633 20.129Q-53.852 19.963-53.852 19.700Q-53.852 19.563-53.760 19.474Q-53.667 19.386-53.527 19.386Q-53.390 19.386-53.302 19.474Q-53.213 19.563-53.213 19.700Q-53.213 19.803-53.266 19.881Q-53.319 19.960-53.411 20.001\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(128.725 -60.846)\">\u003Cpath d=\"M-46.884 17.331Q-46.884 17.010-46.759 16.721Q-46.634 16.432-46.408 16.209Q-46.183 15.985-45.887 15.865Q-45.592 15.745-45.274 15.745Q-44.946 15.745-44.684 15.845Q-44.423 15.944-44.247 16.126Q-44.071 16.309-43.977 16.567Q-43.883 16.825-43.883 17.157Q-43.883 17.249-43.965 17.270L-46.220 17.270L-46.220 17.331Q-46.220 17.919-45.937 18.302Q-45.653 18.685-45.086 18.685Q-44.764 18.685-44.496 18.492Q-44.228 18.299-44.139 17.984Q-44.132 17.943-44.057 17.929L-43.965 17.929Q-43.883 17.953-43.883 18.025Q-43.883 18.032-43.889 18.059Q-44.002 18.456-44.373 18.695Q-44.744 18.934-45.168 18.934Q-45.605 18.934-46.005 18.726Q-46.405 18.517-46.644 18.150Q-46.884 17.783-46.884 17.331M-46.214 17.061L-44.399 17.061Q-44.399 16.784-44.496 16.532Q-44.594 16.279-44.792 16.123Q-44.990 15.968-45.274 15.968Q-45.551 15.968-45.764 16.126Q-45.978 16.285-46.096 16.540Q-46.214 16.795-46.214 17.061M-40.711 19.546L-40.711 17.290L-42.960 17.290Q-43.028 17.280-43.074 17.234Q-43.120 17.188-43.120 17.116Q-43.120 16.972-42.960 16.949L-40.711 16.949L-40.711 14.693Q-40.700 14.624-40.654 14.578Q-40.608 14.532-40.536 14.532Q-40.393 14.532-40.369 14.693L-40.369 16.949L-38.127 16.949Q-37.966 16.972-37.966 17.116Q-37.966 17.188-38.012 17.234Q-38.058 17.280-38.127 17.290L-40.369 17.290L-40.369 19.546Q-40.393 19.707-40.536 19.707Q-40.608 19.707-40.654 19.661Q-40.700 19.615-40.711 19.546M-35.406 18.866L-37.142 18.866L-37.142 18.586Q-36.913 18.586-36.765 18.552Q-36.616 18.517-36.616 18.377L-36.616 16.528Q-36.616 16.258-36.724 16.197Q-36.831 16.135-37.142 16.135L-37.142 15.855L-36.114 15.780L-36.114 16.487Q-35.984 16.179-35.741 15.980Q-35.498 15.780-35.180 15.780Q-34.962 15.780-34.791 15.904Q-34.620 16.029-34.620 16.241Q-34.620 16.378-34.719 16.477Q-34.818 16.576-34.951 16.576Q-35.088 16.576-35.187 16.477Q-35.286 16.378-35.286 16.241Q-35.286 16.101-35.187 16.002Q-35.478 16.002-35.678 16.198Q-35.878 16.395-35.970 16.689Q-36.062 16.983-36.062 17.263L-36.062 18.377Q-36.062 18.586-35.406 18.586\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cg stroke=\"none\">\u003Cg transform=\"translate(3.533 -37.39)\">\u003Cpath d=\"M-68.688 18.628L-68.688 18.538Q-68.637 18.331-68.442 18.307L-67.336 18.307L-67.336 14.538L-68.442 14.538Q-68.637 14.514-68.688 14.300L-68.688 14.210Q-68.637 14.003-68.442 13.979L-66.946 13.979Q-66.754 14.003-66.696 14.210L-66.696 18.307L-65.594 18.307Q-65.395 18.331-65.344 18.538L-65.344 18.628Q-65.395 18.843-65.594 18.866L-68.442 18.866Q-68.637 18.843-68.688 18.628\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -37.39)\">\u003Cpath d=\"M-58.516 18.905Q-58.989 18.905-59.373 18.661Q-59.758 18.417-59.981 18.007Q-60.203 17.596-60.203 17.139Q-60.203 16.796-60.078 16.473Q-59.953 16.151-59.723 15.897Q-59.492 15.643-59.186 15.499Q-58.879 15.354-58.516 15.354Q-58.153 15.354-57.840 15.501Q-57.528 15.647-57.305 15.893Q-57.082 16.139-56.955 16.460Q-56.828 16.780-56.828 17.139Q-56.828 17.596-57.053 18.009Q-57.278 18.421-57.662 18.663Q-58.047 18.905-58.516 18.905M-58.516 18.346Q-58.051 18.346-57.760 17.952Q-57.469 17.557-57.469 17.073Q-57.469 16.780-57.604 16.512Q-57.739 16.245-57.979 16.079Q-58.219 15.913-58.516 15.913Q-58.821 15.913-59.059 16.079Q-59.297 16.245-59.432 16.512Q-59.567 16.780-59.567 17.073Q-59.567 17.553-59.274 17.950Q-58.981 18.346-58.516 18.346\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -37.39)\">\u003Cpath d=\"M-51.128 18.643L-51.593 15.979L-51.753 15.979Q-51.960 15.956-51.999 15.737L-51.999 15.651Q-51.960 15.440-51.753 15.417L-50.585 15.417Q-50.374 15.440-50.335 15.651L-50.335 15.737Q-50.374 15.956-50.585 15.979L-51.058 15.979Q-50.945 16.624-50.866 17.069Q-50.788 17.514-50.738 17.833Q-50.687 18.151-50.687 18.225Q-50.679 18.053-50.394 17.057Q-50.355 16.944-50.257 16.870Q-50.159 16.796-50.038 16.796L-49.960 16.796Q-49.839 16.796-49.741 16.870Q-49.644 16.944-49.609 17.057Q-49.499 17.440-49.417 17.764Q-49.335 18.089-49.335 18.225Q-49.324 17.936-48.976 15.979L-49.449 15.979Q-49.656 15.956-49.695 15.737L-49.695 15.651Q-49.656 15.440-49.449 15.417L-48.273 15.417Q-48.081 15.440-48.023 15.651L-48.023 15.737Q-48.077 15.956-48.273 15.979L-48.441 15.979L-48.906 18.643Q-48.929 18.761-49.017 18.833Q-49.105 18.905-49.226 18.905L-49.366 18.905Q-49.488 18.905-49.583 18.833Q-49.679 18.761-49.722 18.643Q-49.769 18.464-49.841 18.208Q-49.913 17.952-49.956 17.743Q-49.999 17.534-49.999 17.432Q-50.007 17.714-50.288 18.643Q-50.316 18.753-50.413 18.829Q-50.511 18.905-50.632 18.905L-50.808 18.905Q-50.929 18.905-51.017 18.833Q-51.105 18.761-51.128 18.643\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -37.39)\">\u003Cpath d=\"M-40.124 17.378L-42.566 17.378Q-42.511 17.655-42.314 17.878Q-42.116 18.100-41.839 18.223Q-41.562 18.346-41.277 18.346Q-40.804 18.346-40.581 18.057Q-40.574 18.046-40.517 17.940Q-40.460 17.835-40.411 17.792Q-40.363 17.749-40.269 17.737L-40.124 17.737Q-39.933 17.757-39.874 17.971L-39.874 18.026Q-39.941 18.327-40.171 18.524Q-40.402 18.721-40.714 18.813Q-41.027 18.905-41.331 18.905Q-41.816 18.905-42.255 18.677Q-42.695 18.448-42.962 18.048Q-43.230 17.647-43.230 17.155L-43.230 17.096Q-43.230 16.628-42.984 16.225Q-42.738 15.823-42.329 15.589Q-41.921 15.354-41.452 15.354Q-40.949 15.354-40.595 15.577Q-40.241 15.800-40.058 16.188Q-39.874 16.577-39.874 17.081L-39.874 17.139Q-39.933 17.354-40.124 17.378M-42.558 16.827L-40.531 16.827Q-40.577 16.417-40.816 16.165Q-41.054 15.913-41.452 15.913Q-41.847 15.913-42.154 16.175Q-42.460 16.436-42.558 16.827M-39.167 18.628L-39.167 18.538Q-39.109 18.331-38.917 18.307L-38.206 18.307L-38.206 15.979L-38.917 15.979Q-39.113 15.956-39.167 15.737L-39.167 15.651Q-39.109 15.440-38.917 15.417L-37.816 15.417Q-37.616 15.436-37.566 15.651L-37.566 15.979Q-37.304 15.694-36.949 15.536Q-36.593 15.378-36.206 15.378Q-35.913 15.378-35.679 15.512Q-35.445 15.647-35.445 15.913Q-35.445 16.081-35.554 16.198Q-35.663 16.315-35.831 16.315Q-35.984 16.315-36.099 16.204Q-36.214 16.093-36.214 15.936Q-36.589 15.936-36.904 16.137Q-37.218 16.339-37.392 16.673Q-37.566 17.007-37.566 17.386L-37.566 18.307L-36.620 18.307Q-36.413 18.331-36.374 18.538L-36.374 18.628Q-36.413 18.843-36.620 18.866L-38.917 18.866Q-39.109 18.843-39.167 18.628\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cpath d=\"M-31.093-18.923h2.55v.4h-2.55z\"\u002F>\u003C\u002Fg>\u003Cg stroke=\"none\">\u003Cg transform=\"translate(128.725 -38.084)\">\u003Cpath d=\"M-68.764 18.138Q-68.764 17.806-68.541 17.579Q-68.317 17.352-67.973 17.224Q-67.630 17.095-67.257 17.043Q-66.885 16.990-66.580 16.990L-66.580 16.737Q-66.580 16.532-66.688 16.352Q-66.796 16.173-66.977 16.070Q-67.158 15.968-67.366 15.968Q-67.773 15.968-68.009 16.060Q-67.920 16.097-67.874 16.181Q-67.828 16.265-67.828 16.367Q-67.828 16.463-67.874 16.542Q-67.920 16.620-68.001 16.665Q-68.081 16.709-68.170 16.709Q-68.320 16.709-68.421 16.612Q-68.522 16.514-68.522 16.367Q-68.522 15.745-67.366 15.745Q-67.155 15.745-66.905 15.809Q-66.656 15.872-66.454 15.991Q-66.252 16.111-66.126 16.296Q-65.999 16.480-65.999 16.723L-65.999 18.299Q-65.999 18.415-65.938 18.511Q-65.876 18.606-65.763 18.606Q-65.654 18.606-65.589 18.512Q-65.524 18.418-65.524 18.299L-65.524 17.851L-65.258 17.851L-65.258 18.299Q-65.258 18.569-65.485 18.734Q-65.712 18.900-65.992 18.900Q-66.201 18.900-66.338 18.746Q-66.474 18.593-66.498 18.377Q-66.645 18.644-66.927 18.789Q-67.209 18.934-67.534 18.934Q-67.811 18.934-68.095 18.859Q-68.378 18.784-68.571 18.605Q-68.764 18.425-68.764 18.138M-68.149 18.138Q-68.149 18.312-68.048 18.442Q-67.948 18.572-67.792 18.642Q-67.637 18.712-67.472 18.712Q-67.254 18.712-67.045 18.615Q-66.837 18.517-66.709 18.336Q-66.580 18.155-66.580 17.929L-66.580 17.201Q-66.905 17.201-67.271 17.292Q-67.637 17.383-67.893 17.595Q-68.149 17.806-68.149 18.138M-63.197 20.223L-64.827 20.223L-64.827 19.943Q-64.598 19.943-64.449 19.908Q-64.301 19.874-64.301 19.734L-64.301 16.388Q-64.301 16.217-64.437 16.176Q-64.574 16.135-64.827 16.135L-64.827 15.855L-63.747 15.780L-63.747 16.186Q-63.525 15.985-63.238 15.882Q-62.950 15.780-62.643 15.780Q-62.216 15.780-61.852 15.993Q-61.488 16.207-61.274 16.571Q-61.060 16.935-61.060 17.355Q-61.060 17.800-61.300 18.164Q-61.539 18.528-61.932 18.731Q-62.325 18.934-62.769 18.934Q-63.036 18.934-63.284 18.834Q-63.532 18.733-63.720 18.552L-63.720 19.734Q-63.720 19.871-63.571 19.907Q-63.422 19.943-63.197 19.943L-63.197 20.223M-63.720 16.535L-63.720 18.145Q-63.586 18.398-63.344 18.555Q-63.101 18.712-62.824 18.712Q-62.496 18.712-62.243 18.511Q-61.990 18.309-61.857 17.991Q-61.723 17.673-61.723 17.355Q-61.723 17.126-61.788 16.897Q-61.853 16.668-61.981 16.470Q-62.110 16.272-62.304 16.152Q-62.499 16.033-62.732 16.033Q-63.026 16.033-63.294 16.162Q-63.562 16.292-63.720 16.535M-58.781 20.223L-60.411 20.223L-60.411 19.943Q-60.182 19.943-60.033 19.908Q-59.885 19.874-59.885 19.734L-59.885 16.388Q-59.885 16.217-60.021 16.176Q-60.158 16.135-60.411 16.135L-60.411 15.855L-59.331 15.780L-59.331 16.186Q-59.109 15.985-58.822 15.882Q-58.534 15.780-58.227 15.780Q-57.800 15.780-57.436 15.993Q-57.072 16.207-56.858 16.571Q-56.644 16.935-56.644 17.355Q-56.644 17.800-56.884 18.164Q-57.123 18.528-57.516 18.731Q-57.909 18.934-58.353 18.934Q-58.620 18.934-58.868 18.834Q-59.116 18.733-59.304 18.552L-59.304 19.734Q-59.304 19.871-59.155 19.907Q-59.006 19.943-58.781 19.943L-58.781 20.223M-59.304 16.535L-59.304 18.145Q-59.170 18.398-58.928 18.555Q-58.685 18.712-58.408 18.712Q-58.080 18.712-57.827 18.511Q-57.574 18.309-57.441 17.991Q-57.307 17.673-57.307 17.355Q-57.307 17.126-57.372 16.897Q-57.437 16.668-57.565 16.470Q-57.694 16.272-57.888 16.152Q-58.083 16.033-58.316 16.033Q-58.610 16.033-58.878 16.162Q-59.146 16.292-59.304 16.535M-54.341 18.866L-55.944 18.866L-55.944 18.586Q-55.718 18.586-55.569 18.552Q-55.421 18.517-55.421 18.377L-55.421 14.758Q-55.421 14.488-55.528 14.426Q-55.636 14.365-55.944 14.365L-55.944 14.084L-54.867 14.009L-54.867 18.377Q-54.867 18.514-54.717 18.550Q-54.566 18.586-54.341 18.586L-54.341 18.866M-53.411 20.001Q-53.281 20.069-53.144 20.069Q-52.973 20.069-52.823 19.980Q-52.673 19.891-52.562 19.746Q-52.450 19.601-52.372 19.433L-52.109 18.866L-53.278 16.340Q-53.353 16.193-53.483 16.161Q-53.613 16.128-53.845 16.128L-53.845 15.848L-52.324 15.848L-52.324 16.128Q-52.673 16.128-52.673 16.275Q-52.669 16.296-52.668 16.313Q-52.666 16.330-52.666 16.340L-51.808 18.199L-51.035 16.528Q-51.001 16.460-51.001 16.381Q-51.001 16.268-51.085 16.198Q-51.169 16.128-51.282 16.128L-51.282 15.848L-50.085 15.848L-50.085 16.128Q-50.304 16.128-50.477 16.232Q-50.649 16.337-50.741 16.528L-52.078 19.433Q-52.249 19.803-52.519 20.049Q-52.789 20.295-53.144 20.295Q-53.414 20.295-53.633 20.129Q-53.852 19.963-53.852 19.700Q-53.852 19.563-53.760 19.474Q-53.667 19.386-53.527 19.386Q-53.390 19.386-53.302 19.474Q-53.213 19.563-53.213 19.700Q-53.213 19.803-53.266 19.881Q-53.319 19.960-53.411 20.001\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(128.725 -38.084)\">\u003Cpath d=\"M-46.884 17.331Q-46.884 17.010-46.759 16.721Q-46.634 16.432-46.408 16.209Q-46.183 15.985-45.887 15.865Q-45.592 15.745-45.274 15.745Q-44.946 15.745-44.684 15.845Q-44.423 15.944-44.247 16.126Q-44.071 16.309-43.977 16.567Q-43.883 16.825-43.883 17.157Q-43.883 17.249-43.965 17.270L-46.220 17.270L-46.220 17.331Q-46.220 17.919-45.937 18.302Q-45.653 18.685-45.086 18.685Q-44.764 18.685-44.496 18.492Q-44.228 18.299-44.139 17.984Q-44.132 17.943-44.057 17.929L-43.965 17.929Q-43.883 17.953-43.883 18.025Q-43.883 18.032-43.889 18.059Q-44.002 18.456-44.373 18.695Q-44.744 18.934-45.168 18.934Q-45.605 18.934-46.005 18.726Q-46.405 18.517-46.644 18.150Q-46.884 17.783-46.884 17.331M-46.214 17.061L-44.399 17.061Q-44.399 16.784-44.496 16.532Q-44.594 16.279-44.792 16.123Q-44.990 15.968-45.274 15.968Q-45.551 15.968-45.764 16.126Q-45.978 16.285-46.096 16.540Q-46.214 16.795-46.214 17.061M-41.545 18.866L-43.281 18.866L-43.281 18.586Q-43.052 18.586-42.903 18.552Q-42.755 18.517-42.755 18.377L-42.755 16.528Q-42.755 16.258-42.862 16.197Q-42.970 16.135-43.281 16.135L-43.281 15.855L-42.252 15.780L-42.252 16.487Q-42.122 16.179-41.880 15.980Q-41.637 15.780-41.319 15.780Q-41.100 15.780-40.929 15.904Q-40.759 16.029-40.759 16.241Q-40.759 16.378-40.858 16.477Q-40.957 16.576-41.090 16.576Q-41.227 16.576-41.326 16.477Q-41.425 16.378-41.425 16.241Q-41.425 16.101-41.326 16.002Q-41.616 16.002-41.816 16.198Q-42.016 16.395-42.109 16.689Q-42.201 16.983-42.201 17.263L-42.201 18.377Q-42.201 18.586-41.545 18.586L-41.545 18.866M-37.590 19.546L-37.590 17.290L-39.839 17.290Q-39.907 17.280-39.954 17.234Q-40 17.188-40 17.116Q-40 16.972-39.839 16.949L-37.590 16.949L-37.590 14.693Q-37.580 14.624-37.534 14.578Q-37.488 14.532-37.416 14.532Q-37.272 14.532-37.248 14.693L-37.248 16.949L-35.006 16.949Q-34.845 16.972-34.845 17.116Q-34.845 17.188-34.892 17.234Q-34.938 17.280-35.006 17.290L-37.248 17.290L-37.248 19.546Q-37.272 19.707-37.416 19.707Q-37.488 19.707-37.534 19.661Q-37.580 19.615-37.590 19.546\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003Cpath d=\"M94.865-19.618h2.392v.4h-2.392z\"\u002F>\u003C\u002Fg>\u003Cg stroke=\"none\">\u003Cg transform=\"translate(3.533 -14.627)\">\u003Cpath d=\"M-68.688 18.628L-68.688 18.538Q-68.637 18.331-68.442 18.307L-67.336 18.307L-67.336 14.538L-68.442 14.538Q-68.637 14.514-68.688 14.300L-68.688 14.210Q-68.637 14.003-68.442 13.979L-66.946 13.979Q-66.754 14.003-66.696 14.210L-66.696 18.307L-65.594 18.307Q-65.395 18.331-65.344 18.538L-65.344 18.628Q-65.395 18.843-65.594 18.866L-68.442 18.866Q-68.637 18.843-68.688 18.628M-62.770 18.905Q-63.242 18.905-63.627 18.661Q-64.012 18.417-64.235 18.007Q-64.457 17.596-64.457 17.139Q-64.457 16.796-64.332 16.473Q-64.207 16.151-63.977 15.897Q-63.746 15.643-63.440 15.499Q-63.133 15.354-62.770 15.354Q-62.407 15.354-62.094 15.501Q-61.782 15.647-61.559 15.893Q-61.336 16.139-61.209 16.460Q-61.082 16.780-61.082 17.139Q-61.082 17.596-61.307 18.009Q-61.532 18.421-61.916 18.663Q-62.301 18.905-62.770 18.905M-62.770 18.346Q-62.305 18.346-62.014 17.952Q-61.723 17.557-61.723 17.073Q-61.723 16.780-61.858 16.512Q-61.992 16.245-62.233 16.079Q-62.473 15.913-62.770 15.913Q-63.075 15.913-63.313 16.079Q-63.551 16.245-63.686 16.512Q-63.821 16.780-63.821 17.073Q-63.821 17.553-63.528 17.950Q-63.235 18.346-62.770 18.346\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -14.627)\">\u003Cpath d=\"M-55.378 18.643L-55.843 15.979L-56.003 15.979Q-56.210 15.956-56.249 15.737L-56.249 15.651Q-56.210 15.440-56.003 15.417L-54.835 15.417Q-54.624 15.440-54.585 15.651L-54.585 15.737Q-54.624 15.956-54.835 15.979L-55.308 15.979Q-55.195 16.624-55.116 17.069Q-55.038 17.514-54.988 17.833Q-54.937 18.151-54.937 18.225Q-54.929 18.053-54.644 17.057Q-54.605 16.944-54.507 16.870Q-54.409 16.796-54.288 16.796L-54.210 16.796Q-54.089 16.796-53.991 16.870Q-53.894 16.944-53.859 17.057Q-53.749 17.440-53.667 17.764Q-53.585 18.089-53.585 18.225Q-53.574 17.936-53.226 15.979L-53.699 15.979Q-53.906 15.956-53.945 15.737L-53.945 15.651Q-53.906 15.440-53.699 15.417L-52.523 15.417Q-52.331 15.440-52.273 15.651L-52.273 15.737Q-52.327 15.956-52.523 15.979L-52.691 15.979L-53.156 18.643Q-53.179 18.761-53.267 18.833Q-53.355 18.905-53.476 18.905L-53.616 18.905Q-53.738 18.905-53.833 18.833Q-53.929 18.761-53.972 18.643Q-54.019 18.464-54.091 18.208Q-54.163 17.952-54.206 17.743Q-54.249 17.534-54.249 17.432Q-54.257 17.714-54.538 18.643Q-54.566 18.753-54.663 18.829Q-54.761 18.905-54.882 18.905L-55.058 18.905Q-55.179 18.905-55.267 18.833Q-55.355 18.761-55.378 18.643\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 -14.627)\">\u003Cpath d=\"M-44.374 17.378L-46.816 17.378Q-46.761 17.655-46.564 17.878Q-46.366 18.100-46.089 18.223Q-45.812 18.346-45.527 18.346Q-45.054 18.346-44.831 18.057Q-44.824 18.046-44.767 17.940Q-44.710 17.835-44.661 17.792Q-44.613 17.749-44.519 17.737L-44.374 17.737Q-44.183 17.757-44.124 17.971L-44.124 18.026Q-44.191 18.327-44.421 18.524Q-44.652 18.721-44.964 18.813Q-45.277 18.905-45.581 18.905Q-46.066 18.905-46.505 18.677Q-46.945 18.448-47.212 18.048Q-47.480 17.647-47.480 17.155L-47.480 17.096Q-47.480 16.628-47.234 16.225Q-46.988 15.823-46.579 15.589Q-46.171 15.354-45.702 15.354Q-45.199 15.354-44.845 15.577Q-44.491 15.800-44.308 16.188Q-44.124 16.577-44.124 17.081L-44.124 17.139Q-44.183 17.354-44.374 17.378M-46.808 16.827L-44.781 16.827Q-44.827 16.417-45.066 16.165Q-45.304 15.913-45.702 15.913Q-46.097 15.913-46.404 16.175Q-46.710 16.436-46.808 16.827M-43.417 18.628L-43.417 18.538Q-43.359 18.331-43.167 18.307L-42.456 18.307L-42.456 15.979L-43.167 15.979Q-43.363 15.956-43.417 15.737L-43.417 15.651Q-43.359 15.440-43.167 15.417L-42.066 15.417Q-41.866 15.436-41.816 15.651L-41.816 15.979Q-41.554 15.694-41.199 15.536Q-40.843 15.378-40.456 15.378Q-40.163 15.378-39.929 15.512Q-39.695 15.647-39.695 15.913Q-39.695 16.081-39.804 16.198Q-39.913 16.315-40.081 16.315Q-40.234 16.315-40.349 16.204Q-40.464 16.093-40.464 15.936Q-40.839 15.936-41.154 16.137Q-41.468 16.339-41.642 16.673Q-41.816 17.007-41.816 17.386L-41.816 18.307L-40.870 18.307Q-40.663 18.331-40.624 18.538L-40.624 18.628Q-40.663 18.843-40.870 18.866L-43.167 18.866Q-43.359 18.843-43.417 18.628\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cpath d=\"M-35.343 3.839h2.55v.4h-2.55z\"\u002F>\u003C\u002Fg>\u003Cg stroke=\"none\" font-family=\"cmr7\" font-size=\"7\">\u003Cg transform=\"translate(128.725 -15.322)\">\u003Cpath d=\"M-68.764 18.138Q-68.764 17.806-68.541 17.579Q-68.317 17.352-67.973 17.224Q-67.630 17.095-67.257 17.043Q-66.885 16.990-66.580 16.990L-66.580 16.737Q-66.580 16.532-66.688 16.352Q-66.796 16.173-66.977 16.070Q-67.158 15.968-67.366 15.968Q-67.773 15.968-68.009 16.060Q-67.920 16.097-67.874 16.181Q-67.828 16.265-67.828 16.367Q-67.828 16.463-67.874 16.542Q-67.920 16.620-68.001 16.665Q-68.081 16.709-68.170 16.709Q-68.320 16.709-68.421 16.612Q-68.522 16.514-68.522 16.367Q-68.522 15.745-67.366 15.745Q-67.155 15.745-66.905 15.809Q-66.656 15.872-66.454 15.991Q-66.252 16.111-66.126 16.296Q-65.999 16.480-65.999 16.723L-65.999 18.299Q-65.999 18.415-65.938 18.511Q-65.876 18.606-65.763 18.606Q-65.654 18.606-65.589 18.512Q-65.524 18.418-65.524 18.299L-65.524 17.851L-65.258 17.851L-65.258 18.299Q-65.258 18.569-65.485 18.734Q-65.712 18.900-65.992 18.900Q-66.201 18.900-66.338 18.746Q-66.474 18.593-66.498 18.377Q-66.645 18.644-66.927 18.789Q-67.209 18.934-67.534 18.934Q-67.811 18.934-68.095 18.859Q-68.378 18.784-68.571 18.605Q-68.764 18.425-68.764 18.138M-68.149 18.138Q-68.149 18.312-68.048 18.442Q-67.948 18.572-67.792 18.642Q-67.637 18.712-67.472 18.712Q-67.254 18.712-67.045 18.615Q-66.837 18.517-66.709 18.336Q-66.580 18.155-66.580 17.929L-66.580 17.201Q-66.905 17.201-67.271 17.292Q-67.637 17.383-67.893 17.595Q-68.149 17.806-68.149 18.138M-63.197 20.223L-64.827 20.223L-64.827 19.943Q-64.598 19.943-64.449 19.908Q-64.301 19.874-64.301 19.734L-64.301 16.388Q-64.301 16.217-64.437 16.176Q-64.574 16.135-64.827 16.135L-64.827 15.855L-63.747 15.780L-63.747 16.186Q-63.525 15.985-63.238 15.882Q-62.950 15.780-62.643 15.780Q-62.216 15.780-61.852 15.993Q-61.488 16.207-61.274 16.571Q-61.060 16.935-61.060 17.355Q-61.060 17.800-61.300 18.164Q-61.539 18.528-61.932 18.731Q-62.325 18.934-62.769 18.934Q-63.036 18.934-63.284 18.834Q-63.532 18.733-63.720 18.552L-63.720 19.734Q-63.720 19.871-63.571 19.907Q-63.422 19.943-63.197 19.943L-63.197 20.223M-63.720 16.535L-63.720 18.145Q-63.586 18.398-63.344 18.555Q-63.101 18.712-62.824 18.712Q-62.496 18.712-62.243 18.511Q-61.990 18.309-61.857 17.991Q-61.723 17.673-61.723 17.355Q-61.723 17.126-61.788 16.897Q-61.853 16.668-61.981 16.470Q-62.110 16.272-62.304 16.152Q-62.499 16.033-62.732 16.033Q-63.026 16.033-63.294 16.162Q-63.562 16.292-63.720 16.535M-58.781 20.223L-60.411 20.223L-60.411 19.943Q-60.182 19.943-60.033 19.908Q-59.885 19.874-59.885 19.734L-59.885 16.388Q-59.885 16.217-60.021 16.176Q-60.158 16.135-60.411 16.135L-60.411 15.855L-59.331 15.780L-59.331 16.186Q-59.109 15.985-58.822 15.882Q-58.534 15.780-58.227 15.780Q-57.800 15.780-57.436 15.993Q-57.072 16.207-56.858 16.571Q-56.644 16.935-56.644 17.355Q-56.644 17.800-56.884 18.164Q-57.123 18.528-57.516 18.731Q-57.909 18.934-58.353 18.934Q-58.620 18.934-58.868 18.834Q-59.116 18.733-59.304 18.552L-59.304 19.734Q-59.304 19.871-59.155 19.907Q-59.006 19.943-58.781 19.943L-58.781 20.223M-59.304 16.535L-59.304 18.145Q-59.170 18.398-58.928 18.555Q-58.685 18.712-58.408 18.712Q-58.080 18.712-57.827 18.511Q-57.574 18.309-57.441 17.991Q-57.307 17.673-57.307 17.355Q-57.307 17.126-57.372 16.897Q-57.437 16.668-57.565 16.470Q-57.694 16.272-57.888 16.152Q-58.083 16.033-58.316 16.033Q-58.610 16.033-58.878 16.162Q-59.146 16.292-59.304 16.535M-54.341 18.866L-55.944 18.866L-55.944 18.586Q-55.718 18.586-55.569 18.552Q-55.421 18.517-55.421 18.377L-55.421 14.758Q-55.421 14.488-55.528 14.426Q-55.636 14.365-55.944 14.365L-55.944 14.084L-54.867 14.009L-54.867 18.377Q-54.867 18.514-54.717 18.550Q-54.566 18.586-54.341 18.586L-54.341 18.866M-53.411 20.001Q-53.281 20.069-53.144 20.069Q-52.973 20.069-52.823 19.980Q-52.673 19.891-52.562 19.746Q-52.450 19.601-52.372 19.433L-52.109 18.866L-53.278 16.340Q-53.353 16.193-53.483 16.161Q-53.613 16.128-53.845 16.128L-53.845 15.848L-52.324 15.848L-52.324 16.128Q-52.673 16.128-52.673 16.275Q-52.669 16.296-52.668 16.313Q-52.666 16.330-52.666 16.340L-51.808 18.199L-51.035 16.528Q-51.001 16.460-51.001 16.381Q-51.001 16.268-51.085 16.198Q-51.169 16.128-51.282 16.128L-51.282 15.848L-50.085 15.848L-50.085 16.128Q-50.304 16.128-50.477 16.232Q-50.649 16.337-50.741 16.528L-52.078 19.433Q-52.249 19.803-52.519 20.049Q-52.789 20.295-53.144 20.295Q-53.414 20.295-53.633 20.129Q-53.852 19.963-53.852 19.700Q-53.852 19.563-53.760 19.474Q-53.667 19.386-53.527 19.386Q-53.390 19.386-53.302 19.474Q-53.213 19.563-53.213 19.700Q-53.213 19.803-53.266 19.881Q-53.319 19.960-53.411 20.001\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(128.725 -15.322)\">\u003Cpath d=\"M-45.175 18.866L-46.778 18.866L-46.778 18.586Q-46.552 18.586-46.403 18.552Q-46.255 18.517-46.255 18.377L-46.255 14.758Q-46.255 14.488-46.362 14.426Q-46.470 14.365-46.778 14.365L-46.778 14.084L-45.701 14.009L-45.701 18.377Q-45.701 18.514-45.551 18.550Q-45.400 18.586-45.175 18.586L-45.175 18.866M-41.996 19.546L-41.996 17.290L-44.245 17.290Q-44.313 17.280-44.359 17.234Q-44.406 17.188-44.406 17.116Q-44.406 16.972-44.245 16.949L-41.996 16.949L-41.996 14.693Q-41.986 14.624-41.939 14.578Q-41.893 14.532-41.822 14.532Q-41.678 14.532-41.654 14.693L-41.654 16.949L-39.412 16.949Q-39.251 16.972-39.251 17.116Q-39.251 17.188-39.297 17.234Q-39.344 17.280-39.412 17.290L-41.654 17.290L-41.654 19.546Q-41.678 19.707-41.822 19.707Q-41.893 19.707-41.939 19.661Q-41.986 19.615-41.996 19.546M-38.482 17.383Q-38.482 17.041-38.347 16.742Q-38.212 16.443-37.973 16.219Q-37.734 15.995-37.416 15.870Q-37.098 15.745-36.766 15.745Q-36.322 15.745-35.922 15.961Q-35.522 16.176-35.288 16.554Q-35.054 16.931-35.054 17.383Q-35.054 17.724-35.196 18.008Q-35.338 18.292-35.582 18.499Q-35.826 18.705-36.136 18.820Q-36.445 18.934-36.766 18.934Q-37.197 18.934-37.599 18.733Q-38 18.531-38.241 18.179Q-38.482 17.827-38.482 17.383M-36.766 18.685Q-36.165 18.685-35.941 18.307Q-35.717 17.929-35.717 17.297Q-35.717 16.685-35.951 16.326Q-36.185 15.968-36.766 15.968Q-37.819 15.968-37.819 17.297Q-37.819 17.929-37.594 18.307Q-37.368 18.685-36.766 18.685\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cg fill=\"var(--tk-accent)\" stroke=\"none\">\u003Cg transform=\"translate(3.533 8.135)\">\u003Cpath d=\"M-68.688 18.628L-68.688 18.538Q-68.637 18.331-68.442 18.307L-67.336 18.307L-67.336 14.538L-68.442 14.538Q-68.637 14.514-68.688 14.300L-68.688 14.210Q-68.637 14.003-68.442 13.979L-66.946 13.979Q-66.754 14.003-66.696 14.210L-66.696 18.307L-65.594 18.307Q-65.395 18.331-65.344 18.538L-65.344 18.628Q-65.395 18.843-65.594 18.866L-68.442 18.866Q-68.637 18.843-68.688 18.628M-62.770 18.905Q-63.242 18.905-63.627 18.661Q-64.012 18.417-64.235 18.007Q-64.457 17.596-64.457 17.139Q-64.457 16.796-64.332 16.473Q-64.207 16.151-63.977 15.897Q-63.746 15.643-63.440 15.499Q-63.133 15.354-62.770 15.354Q-62.407 15.354-62.094 15.501Q-61.782 15.647-61.559 15.893Q-61.336 16.139-61.209 16.460Q-61.082 16.780-61.082 17.139Q-61.082 17.596-61.307 18.009Q-61.532 18.421-61.916 18.663Q-62.301 18.905-62.770 18.905M-62.770 18.346Q-62.305 18.346-62.014 17.952Q-61.723 17.557-61.723 17.073Q-61.723 16.780-61.858 16.512Q-61.992 16.245-62.233 16.079Q-62.473 15.913-62.770 15.913Q-63.075 15.913-63.313 16.079Q-63.551 16.245-63.686 16.512Q-63.821 16.780-63.821 17.073Q-63.821 17.553-63.528 17.950Q-63.235 18.346-62.770 18.346M-59.637 18.643L-60.102 15.979L-60.262 15.979Q-60.469 15.956-60.508 15.737L-60.508 15.651Q-60.469 15.440-60.262 15.417L-59.094 15.417Q-58.883 15.440-58.844 15.651L-58.844 15.737Q-58.883 15.956-59.094 15.979L-59.567 15.979Q-59.453 16.624-59.375 17.069Q-59.297 17.514-59.246 17.833Q-59.196 18.151-59.196 18.225Q-59.188 18.053-58.903 17.057Q-58.864 16.944-58.766 16.870Q-58.668 16.796-58.547 16.796L-58.469 16.796Q-58.348 16.796-58.250 16.870Q-58.153 16.944-58.117 17.057Q-58.008 17.440-57.926 17.764Q-57.844 18.089-57.844 18.225Q-57.832 17.936-57.485 15.979L-57.957 15.979Q-58.164 15.956-58.203 15.737L-58.203 15.651Q-58.164 15.440-57.957 15.417L-56.782 15.417Q-56.590 15.440-56.532 15.651L-56.532 15.737Q-56.586 15.956-56.782 15.979L-56.950 15.979L-57.414 18.643Q-57.438 18.761-57.526 18.833Q-57.614 18.905-57.735 18.905L-57.875 18.905Q-57.996 18.905-58.092 18.833Q-58.188 18.761-58.231 18.643Q-58.278 18.464-58.350 18.208Q-58.422 17.952-58.465 17.743Q-58.508 17.534-58.508 17.432Q-58.516 17.714-58.797 18.643Q-58.825 18.753-58.922 18.829Q-59.020 18.905-59.141 18.905L-59.317 18.905Q-59.438 18.905-59.526 18.833Q-59.614 18.761-59.637 18.643\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(3.533 8.135)\">\u003Cpath d=\"M-48.624 17.378L-51.066 17.378Q-51.011 17.655-50.814 17.878Q-50.616 18.100-50.339 18.223Q-50.062 18.346-49.777 18.346Q-49.304 18.346-49.081 18.057Q-49.074 18.046-49.017 17.940Q-48.960 17.835-48.911 17.792Q-48.863 17.749-48.769 17.737L-48.624 17.737Q-48.433 17.757-48.374 17.971L-48.374 18.026Q-48.441 18.327-48.671 18.524Q-48.902 18.721-49.214 18.813Q-49.527 18.905-49.831 18.905Q-50.316 18.905-50.755 18.677Q-51.195 18.448-51.462 18.048Q-51.730 17.647-51.730 17.155L-51.730 17.096Q-51.730 16.628-51.484 16.225Q-51.238 15.823-50.829 15.589Q-50.421 15.354-49.952 15.354Q-49.449 15.354-49.095 15.577Q-48.741 15.800-48.558 16.188Q-48.374 16.577-48.374 17.081L-48.374 17.139Q-48.433 17.354-48.624 17.378M-51.058 16.827L-49.031 16.827Q-49.077 16.417-49.316 16.165Q-49.554 15.913-49.952 15.913Q-50.347 15.913-50.654 16.175Q-50.960 16.436-51.058 16.827M-47.667 18.628L-47.667 18.538Q-47.609 18.331-47.417 18.307L-46.706 18.307L-46.706 15.979L-47.417 15.979Q-47.613 15.956-47.667 15.737L-47.667 15.651Q-47.609 15.440-47.417 15.417L-46.316 15.417Q-46.116 15.436-46.066 15.651L-46.066 15.979Q-45.804 15.694-45.449 15.536Q-45.093 15.378-44.706 15.378Q-44.413 15.378-44.179 15.512Q-43.945 15.647-43.945 15.913Q-43.945 16.081-44.054 16.198Q-44.163 16.315-44.331 16.315Q-44.484 16.315-44.599 16.204Q-44.714 16.093-44.714 15.936Q-45.089 15.936-45.404 16.137Q-45.718 16.339-45.892 16.673Q-46.066 17.007-46.066 17.386L-46.066 18.307L-45.120 18.307Q-44.913 18.331-44.874 18.538L-44.874 18.628Q-44.913 18.843-45.120 18.866L-47.417 18.866Q-47.609 18.843-47.667 18.628\" fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\" class=\"tikz-text\" style=\"stroke-width:0.240\"\u002F>\u003C\u002Fg>\u003Cpath d=\"M-39.593 26.6h2.55v.4h-2.55z\"\u002F>\u003C\u002Fg>\u003Cg stroke=\"none\" font-family=\"cmr7\" font-size=\"7\">\u003Cg transform=\"translate(128.725 7.44)\">\u003Cpath d=\"M-68.764 18.138Q-68.764 17.806-68.541 17.579Q-68.317 17.352-67.973 17.224Q-67.630 17.095-67.257 17.043Q-66.885 16.990-66.580 16.990L-66.580 16.737Q-66.580 16.532-66.688 16.352Q-66.796 16.173-66.977 16.070Q-67.158 15.968-67.366 15.968Q-67.773 15.968-68.009 16.060Q-67.920 16.097-67.874 16.181Q-67.828 16.265-67.828 16.367Q-67.828 16.463-67.874 16.542Q-67.920 16.620-68.001 16.665Q-68.081 16.709-68.170 16.709Q-68.320 16.709-68.421 16.612Q-68.522 16.514-68.522 16.367Q-68.522 15.745-67.366 15.745Q-67.155 15.745-66.905 15.809Q-66.656 15.872-66.454 15.991Q-66.252 16.111-66.126 16.296Q-65.999 16.480-65.999 16.723L-65.999 18.299Q-65.999 18.415-65.938 18.511Q-65.876 18.606-65.763 18.606Q-65.654 18.606-65.589 18.512Q-65.524 18.418-65.524 18.299L-65.524 17.851L-65.258 17.851L-65.258 18.299Q-65.258 18.569-65.485 18.734Q-65.712 18.900-65.992 18.900Q-66.201 18.900-66.338 18.746Q-66.474 18.593-66.498 18.377Q-66.645 18.644-66.927 18.789Q-67.209 18.934-67.534 18.934Q-67.811 18.934-68.095 18.859Q-68.378 18.784-68.571 18.605Q-68.764 18.425-68.764 18.138M-68.149 18.138Q-68.149 18.312-68.048 18.442Q-67.948 18.572-67.792 18.642Q-67.637 18.712-67.472 18.712Q-67.254 18.712-67.045 18.615Q-66.837 18.517-66.709 18.336Q-66.580 18.155-66.580 17.929L-66.580 17.201Q-66.905 17.201-67.271 17.292Q-67.637 17.383-67.893 17.595Q-68.149 17.806-68.149 18.138M-63.197 20.223L-64.827 20.223L-64.827 19.943Q-64.598 19.943-64.449 19.908Q-64.301 19.874-64.301 19.734L-64.301 16.388Q-64.301 16.217-64.437 16.176Q-64.574 16.135-64.827 16.135L-64.827 15.855L-63.747 15.780L-63.747 16.186Q-63.525 15.985-63.238 15.882Q-62.950 15.780-62.643 15.780Q-62.216 15.780-61.852 15.993Q-61.488 16.207-61.274 16.571Q-61.060 16.935-61.060 17.355Q-61.060 17.800-61.300 18.164Q-61.539 18.528-61.932 18.731Q-62.325 18.934-62.769 18.934Q-63.036 18.934-63.284 18.834Q-63.532 18.733-63.720 18.552L-63.720 19.734Q-63.720 19.871-63.571 19.907Q-63.422 19.943-63.197 19.943L-63.197 20.223M-63.720 16.535L-63.720 18.145Q-63.586 18.398-63.344 18.555Q-63.101 18.712-62.824 18.712Q-62.496 18.712-62.243 18.511Q-61.990 18.309-61.857 17.991Q-61.723 17.673-61.723 17.355Q-61.723 17.126-61.788 16.897Q-61.853 16.668-61.981 16.470Q-62.110 16.272-62.304 16.152Q-62.499 16.033-62.732 16.033Q-63.026 16.033-63.294 16.162Q-63.562 16.292-63.720 16.535M-58.781 20.223L-60.411 20.223L-60.411 19.943Q-60.182 19.943-60.033 19.908Q-59.885 19.874-59.885 19.734L-59.885 16.388Q-59.885 16.217-60.021 16.176Q-60.158 16.135-60.411 16.135L-60.411 15.855L-59.331 15.780L-59.331 16.186Q-59.109 15.985-58.822 15.882Q-58.534 15.780-58.227 15.780Q-57.800 15.780-57.436 15.993Q-57.072 16.207-56.858 16.571Q-56.644 16.935-56.644 17.355Q-56.644 17.800-56.884 18.164Q-57.123 18.528-57.516 18.731Q-57.909 18.934-58.353 18.934Q-58.620 18.934-58.868 18.834Q-59.116 18.733-59.304 18.552L-59.304 19.734Q-59.304 19.871-59.155 19.907Q-59.006 19.943-58.781 19.943L-58.781 20.223M-59.304 16.535L-59.304 18.145Q-59.170 18.398-58.928 18.555Q-58.685 18.712-58.408 18.712Q-58.080 18.712-57.827 18.511Q-57.574 18.309-57.441 17.991Q-57.307 17.673-57.307 17.355Q-57.307 17.126-57.372 16.897Q-57.437 16.668-57.565 16.470Q-57.694 16.272-57.888 16.152Q-58.083 16.033-58.316 16.033Q-58.610 16.033-58.878 16.162Q-59.146 16.292-59.304 16.535M-54.341 18.866L-55.944 18.866L-55.944 18.586Q-55.718 18.586-55.569 18.552Q-55.421 18.517-55.421 18.377L-55.421 14.758Q-55.421 14.488-55.528 14.426Q-55.636 14.365-55.944 14.365L-55.944 14.084L-54.867 14.009L-54.867 18.377Q-54.867 18.514-54.717 18.550Q-54.566 18.586-54.341 18.586L-54.341 18.866M-53.411 20.001Q-53.281 20.069-53.144 20.069Q-52.973 20.069-52.823 19.980Q-52.673 19.891-52.562 19.746Q-52.450 19.601-52.372 19.433L-52.109 18.866L-53.278 16.340Q-53.353 16.193-53.483 16.161Q-53.613 16.128-53.845 16.128L-53.845 15.848L-52.324 15.848L-52.324 16.128Q-52.673 16.128-52.673 16.275Q-52.669 16.296-52.668 16.313Q-52.666 16.330-52.666 16.340L-51.808 18.199L-51.035 16.528Q-51.001 16.460-51.001 16.381Q-51.001 16.268-51.085 16.198Q-51.169 16.128-51.282 16.128L-51.282 15.848L-50.085 15.848L-50.085 16.128Q-50.304 16.128-50.477 16.232Q-50.649 16.337-50.741 16.528L-52.078 19.433Q-52.249 19.803-52.519 20.049Q-52.789 20.295-53.144 20.295Q-53.414 20.295-53.633 20.129Q-53.852 19.963-53.852 19.700Q-53.852 19.563-53.760 19.474Q-53.667 19.386-53.527 19.386Q-53.390 19.386-53.302 19.474Q-53.213 19.563-53.213 19.700Q-53.213 19.803-53.266 19.881Q-53.319 19.960-53.411 20.001\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(128.725 7.44)\">\u003Cpath d=\"M-45.175 18.866L-46.778 18.866L-46.778 18.586Q-46.552 18.586-46.403 18.552Q-46.255 18.517-46.255 18.377L-46.255 14.758Q-46.255 14.488-46.362 14.426Q-46.470 14.365-46.778 14.365L-46.778 14.084L-45.701 14.009L-45.701 18.377Q-45.701 18.514-45.551 18.550Q-45.400 18.586-45.175 18.586L-45.175 18.866M-44.621 17.383Q-44.621 17.041-44.486 16.742Q-44.351 16.443-44.112 16.219Q-43.872 15.995-43.554 15.870Q-43.237 15.745-42.905 15.745Q-42.461 15.745-42.061 15.961Q-41.661 16.176-41.427 16.554Q-41.193 16.931-41.193 17.383Q-41.193 17.724-41.334 18.008Q-41.476 18.292-41.721 18.499Q-41.965 18.705-42.274 18.820Q-42.584 18.934-42.905 18.934Q-43.336 18.934-43.737 18.733Q-44.139 18.531-44.380 18.179Q-44.621 17.827-44.621 17.383M-42.905 18.685Q-42.303 18.685-42.080 18.307Q-41.856 17.929-41.856 17.297Q-41.856 16.685-42.090 16.326Q-42.324 15.968-42.905 15.968Q-43.958 15.968-43.958 17.297Q-43.958 17.929-43.732 18.307Q-43.507 18.685-42.905 18.685M-38.014 19.546L-38.014 17.290L-40.263 17.290Q-40.331 17.280-40.377 17.234Q-40.424 17.188-40.424 17.116Q-40.424 16.972-40.263 16.949L-38.014 16.949L-38.014 14.693Q-38.004 14.624-37.958 14.578Q-37.911 14.532-37.840 14.532Q-37.696 14.532-37.672 14.693L-37.672 16.949L-35.430 16.949Q-35.269 16.972-35.269 17.116Q-35.269 17.188-35.315 17.234Q-35.362 17.280-35.430 17.290L-37.672 17.290L-37.672 19.546Q-37.696 19.707-37.840 19.707Q-37.911 19.707-37.958 19.661Q-38.004 19.615-38.014 19.546M-33.072 18.839L-34.053 16.340Q-34.114 16.197-34.232 16.162Q-34.350 16.128-34.565 16.128L-34.565 15.848L-33.085 15.848L-33.085 16.128Q-33.465 16.128-33.465 16.289Q-33.465 16.299-33.451 16.340L-32.737 18.172L-32.063 16.467Q-32.094 16.395-32.094 16.367Q-32.094 16.340-32.121 16.340Q-32.183 16.193-32.301 16.161Q-32.419 16.128-32.631 16.128L-32.631 15.848L-31.233 15.848L-31.233 16.128Q-31.609 16.128-31.609 16.289Q-31.609 16.320-31.602 16.340L-30.846 18.278L-30.159 16.528Q-30.139 16.477-30.139 16.422Q-30.139 16.282-30.252 16.205Q-30.365 16.128-30.505 16.128L-30.505 15.848L-29.284 15.848L-29.284 16.128Q-29.490 16.128-29.645 16.234Q-29.801 16.340-29.872 16.528L-30.778 18.839Q-30.812 18.934-30.925 18.934L-30.993 18.934Q-31.103 18.934-31.140 18.839L-31.923 16.836L-32.709 18.839Q-32.743 18.934-32.856 18.934L-32.925 18.934Q-33.034 18.934-33.072 18.839M-28.256 20.096Q-28.256 20.062-28.228 20.035Q-27.958 19.806-27.810 19.483Q-27.661 19.160-27.661 18.804L-27.661 18.767Q-27.770 18.866-27.934 18.866Q-28.115 18.866-28.235 18.746Q-28.355 18.627-28.355 18.446Q-28.355 18.271-28.235 18.152Q-28.115 18.032-27.934 18.032Q-27.678 18.032-27.558 18.271Q-27.439 18.511-27.439 18.804Q-27.439 19.204-27.608 19.575Q-27.777 19.946-28.074 20.202Q-28.105 20.223-28.133 20.223Q-28.174 20.223-28.215 20.182Q-28.256 20.141-28.256 20.096\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003Cg transform=\"translate(128.725 7.44)\">\u003Cpath d=\"M-23.788 17.355Q-23.788 17.017-23.647 16.726Q-23.507 16.436-23.263 16.222Q-23.019 16.009-22.714 15.894Q-22.410 15.780-22.085 15.780Q-21.815 15.780-21.552 15.879Q-21.289 15.978-21.098 16.156L-21.098 14.758Q-21.098 14.488-21.205 14.426Q-21.313 14.365-21.624 14.365L-21.624 14.084L-20.547 14.009L-20.547 18.193Q-20.547 18.381-20.493 18.464Q-20.438 18.548-20.337 18.567Q-20.236 18.586-20.021 18.586L-20.021 18.866L-21.128 18.934L-21.128 18.517Q-21.545 18.934-22.171 18.934Q-22.602 18.934-22.974 18.722Q-23.347 18.511-23.567 18.150Q-23.788 17.789-23.788 17.355M-22.113 18.712Q-21.904 18.712-21.718 18.640Q-21.532 18.569-21.378 18.432Q-21.224 18.295-21.128 18.117L-21.128 16.508Q-21.214 16.361-21.359 16.241Q-21.504 16.121-21.674 16.062Q-21.843 16.002-22.024 16.002Q-22.584 16.002-22.853 16.391Q-23.121 16.781-23.121 17.362Q-23.121 17.933-22.887 18.323Q-22.653 18.712-22.113 18.712M-19.413 17.383Q-19.413 17.041-19.278 16.742Q-19.143 16.443-18.903 16.219Q-18.664 15.995-18.346 15.870Q-18.028 15.745-17.697 15.745Q-17.252 15.745-16.852 15.961Q-16.453 16.176-16.218 16.554Q-15.984 16.931-15.984 17.383Q-15.984 17.724-16.126 18.008Q-16.268 18.292-16.512 18.499Q-16.757 18.705-17.066 18.820Q-17.375 18.934-17.697 18.934Q-18.127 18.934-18.529 18.733Q-18.931 18.531-19.172 18.179Q-19.413 17.827-19.413 17.383M-17.697 18.685Q-17.095 18.685-16.871 18.307Q-16.647 17.929-16.647 17.297Q-16.647 16.685-16.882 16.326Q-17.116 15.968-17.697 15.968Q-18.749 15.968-18.749 17.297Q-18.749 17.929-18.524 18.307Q-18.298 18.685-17.697 18.685M-13.708 18.866L-15.342 18.866L-15.342 18.586Q-15.113 18.586-14.964 18.552Q-14.815 18.517-14.815 18.377L-14.815 16.528Q-14.815 16.258-14.923 16.197Q-15.031 16.135-15.342 16.135L-15.342 15.855L-14.282 15.780L-14.282 16.429Q-14.111 16.121-13.807 15.950Q-13.503 15.780-13.158 15.780Q-12.652 15.780-12.368 16.003Q-12.084 16.227-12.084 16.723L-12.084 18.377Q-12.084 18.514-11.936 18.550Q-11.787 18.586-11.561 18.586L-11.561 18.866L-13.192 18.866L-13.192 18.586Q-12.963 18.586-12.814 18.552Q-12.665 18.517-12.665 18.377L-12.665 16.737Q-12.665 16.402-12.785 16.202Q-12.905 16.002-13.219 16.002Q-13.489 16.002-13.723 16.138Q-13.957 16.275-14.096 16.509Q-14.234 16.743-14.234 17.017L-14.234 18.377Q-14.234 18.514-14.084 18.550Q-13.934 18.586-13.708 18.586L-13.708 18.866M-11.015 17.331Q-11.015 17.010-10.890 16.721Q-10.765 16.432-10.540 16.209Q-10.314 15.985-10.018 15.865Q-9.723 15.745-9.405 15.745Q-9.077 15.745-8.815 15.845Q-8.554 15.944-8.378 16.126Q-8.202 16.309-8.108 16.567Q-8.014 16.825-8.014 17.157Q-8.014 17.249-8.096 17.270L-10.352 17.270L-10.352 17.331Q-10.352 17.919-10.068 18.302Q-9.784 18.685-9.217 18.685Q-8.895 18.685-8.627 18.492Q-8.359 18.299-8.270 17.984Q-8.263 17.943-8.188 17.929L-8.096 17.929Q-8.014 17.953-8.014 18.025Q-8.014 18.032-8.020 18.059Q-8.133 18.456-8.504 18.695Q-8.875 18.934-9.299 18.934Q-9.736 18.934-10.136 18.726Q-10.536 18.517-10.775 18.150Q-11.015 17.783-11.015 17.331M-10.345 17.061L-8.530 17.061Q-8.530 16.784-8.627 16.532Q-8.725 16.279-8.923 16.123Q-9.121 15.968-9.405 15.968Q-9.682 15.968-9.895 16.126Q-10.109 16.285-10.227 16.540Q-10.345 16.795-10.345 17.061\" fill=\"currentColor\" stroke=\"currentColor\" class=\"tikz-text\" style=\"stroke-width:0.210\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003Cg fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\">\u003Cpath fill=\"none\" d=\"M-29.303-61.371v10.519\"\u002F>\u003Cpath stroke=\"none\" d=\"m-29.303-48.852 1.6-3.2-1.6 1.2-1.6-1.2\"\u002F>\u003C\u002Fg>\u003Cg fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\">\u003Cpath fill=\"none\" d=\"M-29.303-38.609v10.52\"\u002F>\u003Cpath stroke=\"none\" d=\"m-29.303-26.09 1.6-3.2-1.6 1.2-1.6-1.2\"\u002F>\u003C\u002Fg>\u003Cg fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\">\u003Cpath fill=\"none\" d=\"M-29.303-15.847v10.52\"\u002F>\u003Cpath stroke=\"none\" d=\"m-29.303-3.327 1.6-3.2-1.6 1.2-1.6-1.2\"\u002F>\u003C\u002Fg>\u003Cg fill=\"var(--tk-accent)\" stroke=\"var(--tk-accent)\">\u003Cpath fill=\"none\" d=\"M-29.303 6.916v10.519\"\u002F>\u003Cpath stroke=\"none\" d=\"m-29.303 19.435 1.6-3.2-1.6 1.2-1.6-1.2\"\u002F>\u003C\u002Fg>\u003C\u002Fg>\u003C\u002Fsvg>\u003Cfigcaption class=\"tikz-cap\">Segmenting the unseen word lower with the learned merge list. Starting from characters, each learned merge is applied in order where it fits; the word ends as low + er, two in-vocabulary pieces, with no unknown token.\u003C\u002Ffigcaption>",1785117819733]