| Casio ClassPad 300 | MVXZ10ZWNT | definition | open | Wikipedia Casio ClassPad 300, Wikidata Q494408 |
| Casio ClassPad fx-CP400 | 9MPWWSX0AG | unknown | open | Wikipedia Casio ClassPad 300#FHV1 |
| Casio fx-39 | TSS4SYV5FG | definition | open | Wikipedia Casio fx-39, Wikidata Q23679941 |
| Casio fx-3900Pv | 2HH4NTFT4Z | definition | open | Wikipedia Casio fx-3900Pv, Wikidata Q5048919 |
| Casio fx-7000G | XPEAVKP38Z | definition | open | Wikipedia Casio fx-7000G, Wikidata Q5048937 |
| Casio fx-92 | HSJBZ2W9N6 | unknown | open | Wikipedia Casio V.P.A.M. calculators#6KAC |
| Casio fx-CG500 | VSED7C7BCW | unknown | open | Wikipedia Casio ClassPad 300#MANE |
| Casio V.P.A.M. calculators | 3V87GSTBK7 | definition | open | Wikipedia Casio V.P.A.M. calculators, Wikidata Q22909598 |
| Casorati–Weierstrass theorem | 8D5P9Q9AHV | statement | node (a node has the same name as the row) | mathlib_1000 Q2226962, Wikidata Q2226962, thousand_plus Q2226962, Wikipedia Weierstrass–Casorati theorem, Wikipedia Casorati–Weierstrass theorem |
| Caspar Isenkrahe | 6VBVWXZT2N | topic | open | Wikipedia List of German mathematicians#J18W |
| Caspar Isenkrahe | J5DVYH1BKZ | topic | open | Wikipedia Caspar Isenkrahe, Wikidata Q106628 |
| Caspar Wessel | 2BCDMX1YKZ | topic | open | Wikipedia Caspar Wessel, Wikidata Q372017 |
| Casselman-Wallach | XFQAZPEQYR | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv math/0301148#0IL8 |
| Cassels' conjecture | XJ3P0PH7B1 | statement | open | Wikipedia Kummer sum#NN8Q |
| Cassels–Swinnerton-Dyer conjecture | E7Q6VSK8PW | statement | open | Wikipedia Littlewood conjecture#GP9U |
| Cassini and Catalan identities | 8VRZDXJERA | definition | open | Wikipedia List of mathematical identities#P02D |
| Cassini and Catalan identities | XKFW9K5RGG | definition | open | Wikipedia Cassini and Catalan identities, Wikidata Q4459371 |
| Cassini oval | B6X3CD58XM | concept | open | Wikidata Q728699, MathWorld CassiniOvals, Wikipedia Cassini oval |
| Cassini oval | DEWPRC0RMB | definition | open | Wikipedia List of mathematical shapes#RFIC, Wikipedia List of curves#8N8Z |
| Cassini projection | JVA92JGBSE | unknown | open | Wikidata Q5049440, MathWorld CassiniProjection |
| Cassini's identity | 718ASJGP7D | concept | node (a node has the same name as the row) | Wikidata Q123169377, MathWorld CassinisIdentity |
| Cassinoide | VSPG0Z9DR4 | definition | open | Wikipedia List of mathematical shapes#UZZN, Wikipedia List of curves#X8Z1 |
| Cassius Ionescu-Tulcea | X9T9KYBX14 | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q15222811, ProofWiki Mathematician:Cassius_Tocqueville_Ionescu_Tulcea |
| Cassius Jackson Keyser | AGENZ5MTBE | unknown | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#20ZD |
| Casson | 7DQVXF2QB0 | definition | open | Wikipedia Glossary of algebraic topology#S482 |
| Casson handle | V94ZQY82B4 | definition | open | Wikipedia Casson handle, Wikidata Q5049506 |
| Casson invariant | WQZW8X237K | definition | open | Wikidata Q5049507, nLab Casson invariant, Wikipedia Casson invariant |
| CAST-128 | TP0AFG7815 | definition | open | Wikipedia CAST-128, Wikidata Q53735 |
| CAST-256 | 73EH502WYV | definition | open | Wikipedia CAST-256, Wikidata Q1022875 |
| CAST5 | QPAS4BFSPQ | definition | open | Wikipedia List of cryptosystems#N8R5 |
| Castelnuovo curve | KW1SX19MSD | definition | open | Wikipedia Castelnuovo curve, Wikidata Q5049715 |
| Castelnuovo surface | 369DATSGPQ | definition | open | Wikipedia Castelnuovo surface, Wikidata Q5049718 |
| Castelnuovo surface | KRMJZ8B5JZ | definition | open | Wikipedia List of complex and algebraic surfaces#LCQG |
| Castelnuovo theorem | 33T0HS9DF9 | definition | open | Wikipedia List of theorems#GCSB |
| Castelnuovo's contraction theorem | ZHXQ5TD3C5 | statement | open | Wikipedia Castelnuovo's contraction theorem, Wikidata Q25303824 |
| Castelnuovo's Theorem | AHYXJ9W0PD | statement | open | Wikipedia Algebraic surface#U4ZM |
| Castelnuovo's theorem | TY170T94MB | statement | open | Wikipedia Rational surface#JVRK |
| Castelnuovo–de Franchis theorem | E10ZC9JX8H | statement | open | mathlib_1000 Q5049717, Wikidata Q5049717, thousand_plus Q5049717, Wikipedia Castelnuovo–de Franchis theorem |
| Castelnuovo–de Franchis theorem | Y8RKY6FE24 | statement | open | Wikipedia List of theorems#SLLT |
| Castelnuovo–Mumford regularity | J732XK8GD4 | definition | open | Wikipedia Glossary of algebraic geometry#VBP3 |
| Castelnuovo–Mumford regularity | JY211JP8BS | definition | open | Wikidata Q5049716, nLab wall crossing, Wikipedia Castelnuovo–Mumford regularity |
| Castelnuovo–Severi inequality | A75SS2XFTE | unknown | open | Wikipedia List of inequalities#N4M6 |
| Castigliano's first and second theorems | HJ84Q3E2AK | definition | open | Wikipedia List of theorems#WVEL |
| Castigliano's first theorem – for forces in an elastic structure | F5QBKSRR7C | statement | open | Wikipedia Castigliano's method#RBR5 |
| Castigliano's method | VCJP3641ST | statement | open | mathlib_1000 Q858978, Wikidata Q858978, thousand_plus Q858978, Wikipedia Castigliano's method |
| Castigliano's second theorem – for displacements in a linearly elastic structure | 1VZCJ0SZ5Q | statement | open | Wikipedia Castigliano's method#WOAG |
| Castigliano's theorems | W599HNSMZ9 | statement | open | Wikipedia Castigliano's method#R5GK |
| Casting out nines | H9YXA5ZSXE | definition | node (a node has the same Wikidata item as the row) | Wikidata Q1757155, MathWorld CastingOutNines, Wikipedia Casting out nines |
| Casting out nines | R77HHFKEHZ | definition | open | Wikipedia List of algebraic coding theory topics#TG55 |
| Castles, Ian | 18AENDQZSV | unknown | open | Wikipedia List of statisticians#E8N9 |
| Castleton Four Corners, Vermont | Y7Q56CXNAC | unknown | open | Wikipedia List of places with numeric names#MWFC |
| castling | Q6Y8428TM9 | definition | open | Wikidata Q102877, ProofWiki Definition:Chess/Rules/Castling |
| Castro--Lazer | PCXN6SYGAH | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.21533#7ZLX |
| casus irreducibilis | 1TRVSHZVFW | definition | open | Wikidata Q5050952, MathWorld CasusIrreducibilis, Wikipedia Casus irreducibilis |
| Cat's cradle | 8DA58JH0KY | definition | open | Wikipedia Cat's cradle, Wikidata Q15304688 |
| CAT(0) group | D0J7VT97HD | definition | open | Wikipedia CAT(0) group, Wikidata Q5008888 |
| CAT(k) space | 40DYERGXXK | definition | open | Wikipedia List of things named after Élie Cartan#J2RP |
| CAT(k) space | D94J5XPYQ2 | definition | open | Wikipedia CAT(k) space, Wikidata Q5008891 |
| CAT0TGM61K | CAT0TGM61K | statement | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2610.18929#R0JD |
| Catalan Mathematical Society | MDR6VZKE9P | definition | open | Wikipedia List of mathematical societies#82SK |
| Catalan Mathematical Society | PZ73NZDZE4 | definition | open | Wikipedia Catalan Mathematical Society, Wikidata Q11703964 |
| Catalan number | 8PGZ64R8KA | object | open | Wikipedia List of factorial and binomial topics#W821 |
| Catalan number | GWBS24PWD9 | definition | node (a node has the same Wikidata item as the row) | Wikidata Q270513, MathWorld CatalanNumber, nLab Catalan number, OEIS A000108, ProofWiki Definition:Catalan_Number, Wikipedia Catalan number |
| Catalan number | VJKHVGX95A | concept | open | applied_combinatorics index/2.5/catalan-number |
| Catalan numbers | BYEJDYYJYT | unknown | node (a node has the same name as the row) | mathlib_overview Combinatorics > Enumerative combinatorics > Catalan numbers, Mathlib catalan |
| Catalan pseudoprime | WCP4FB2VW9 | definition | open | Wikidata Q5051230, OEIS A163209, Wikipedia Catalan pseudoprime |
| Catalan solid | 1E5M62E230 | definition | open | Wikidata Q258921, MathWorld CatalanSolid, Wikipedia Catalan solid |
| Catalan solid | K3SHJ6PSX6 | definition | open | Wikipedia List of mathematical shapes#IYIY |
| Catalan surface | 7Y7XKVHR60 | definition | open | Wikipedia List of surfaces#M9UY |
| Catalan surface | Q4Q8ZEFTVT | definition | open | Wikipedia Catalan surface, Wikidata Q4119065 |
| Catalan tiling | PMXP82MCDD | unknown | open | Wikipedia List of Euclidean uniform tilings#VQ2G |
| Catalan's conjecture | 8XHDKP80HK | statement | open | Wikipedia Catalan's conjecture#A30J |
| Catalan's conjecture | CVQDNGMW73 | statement | open | Wikipedia List of number theory topics#1WPS |
| Catalan's conjecture | GBD06TTNJ5 | statement | open | mathlib_1000 Q174955, Wikidata Q174955, thousand_plus Q174955, Wikipedia Mihăilescu's theorem, MathWorld CatalansConjecture, Wikipedia Catalan's conjecture |
| Catalan's constant | V5GCSVXCRH | definition | open | Wikidata Q855282, MathWorld CatalansConstant, OEIS A006752, Wikipedia Catalan's constant |
| Catalan's identity | P9M5FBDXHS | statement | open | Wikidata Q118220479, MathWorld CatalansIdentity |
| Catalan's Mersenne conjecture | QFMBT5P700 | conjecture | open | Wikipedia List of unsolved problems in mathematics#88DP |
| Catalan's minimal surface | DTZ140XR1F | definition | open | Wikipedia List of mathematical shapes#6WX1, Wikipedia List of surfaces#8KN4 |
| Catalan's minimal surface | E7HHSVEK60 | definition | open | Wikidata Q5051207, MathWorld CatalansSurface, Wikipedia Catalan's minimal surface |
| Catalan's triangle | XBQWBC60Z2 | definition | open | Wikidata Q5051208, MathWorld CatalansTriangle, OEIS A009766, Wikipedia Catalan's triangle |
| Catalan–Dickson conjecture | XG6PFR4EMY | statement | open | Wikipedia Aliquot sequence#PYOK |
| Catalan–Dickson conjecture on aliquot sequences | EZN696XDYQ | definition | open | Wikipedia List of unsolved problems in mathematics#3O4J |
| Catalan–Mersenne number conjecture | AHRJN0HV63 | statement | open | Wikipedia Double Mersenne number#34F9 |
| Cataldo Agostinelli | 6YVVKJXGQH | topic | open | Wikipedia Cataldo Agostinelli, Wikidata Q2941600 |
| Cataldo Agostinelli | G0PVP7QGZ5 | topic | open | Wikipedia List of Italian mathematicians#GOWP |
| Catalecticant | 4460SQF8HN | definition | open | Wikipedia Catalecticant, Wikidata Q5051240 |
| catalecticant | F853V1V9DV | definition | open | Wikipedia Glossary of classical algebraic geometry#TYY7 |
| catalecticant | QG11W2AWVW | definition | open | Wikipedia Glossary of invariant theory#PRKG |
| Catalog of articles in probability theory | RWDHFN5YK6 | definition | open | Wikipedia Catalog of articles in probability theory, Wikidata Q5051309 |
| Catalogue of Triangle Cubics | 1WEE6BGGYK | definition | open | Wikipedia Catalogue of Triangle Cubics, Wikidata Q109973376 |
| Catalogue of Triangle Cubics | EE4RFC6HHC | definition | open | Wikipedia List of triangle topics#EZKY |
| Catalogue Paradox | T1Q0V6PH00 | unknown | open | Wikidata Q3895086, MathWorld CatalogueParadox |
| catamorphism | 6ZFJEPC3YV | unknown | open | Wikidata Q1959790, nLab catamorphism |
| Catanese surface | CNR77G76XE | definition | open | Wikipedia Catanese surface, Wikidata Q5051426 |
| Catanese surface | YDSBYGGMB0 | definition | open | Wikipedia List of complex and algebraic surfaces#CLJN |
| Catarina Dutilh Novaes | K72QTVYGKK | unknown | open | Wikipedia List of women logicians#T5GN |
| Catastro of Ensenada | R9CDCY38RC | definition | open | Wikipedia List of statistics articles#ONT0 |
| Catastro of Ensenada | RZXSYB34TN | definition | open | Wikipedia Catastro of Ensenada, Wikidata Q2932613 |
| catastrophe | 3NPAQ4JKRJ | unknown | open | Wikidata Q132320242, MathWorld Catastrophe |
| Catastrophe principle | R0SKBD922E | unknown | open | Wikipedia Heavy-tailed distribution#NJ9Z |