Crystalline cohomology - completely reducible - contact transformation - Calderon operator - Calderon-Vaillancourt theorem - Canonical curve - Cap product - Carleman kernel - Carleman's criterion - Carleman's inequality - Carleman transform - Cartan conjugacy theorem - Cartan criterion - Cartan-Kuranishi theorem - Cartan subgroup - Casson invariant - Castelnuovo curve - Castelnuovo-Enriques theorem - Castelnuovo lemma - Cauchy characteristic vector - Cauchy data - Cauchy formula for convex bodies - Cauchy kernel - Cayley-Brill formula - Chern-Lashof theorem - Chevalley basis - Chevalley theorem - Chordal variety - Christoffel-Darboux formula - Closed unbounded operator - Coercive form - Cohn-Vossen theorem - Complete maximum principle - Compressible mapping - Condensation of singularities - Contingent (mathematics) - Continuity principle - Coincident point - Conley-Zehnder theorem - Conley-Zehnder-Franks theorem -Cotlar-Knapp-Stein lemma - Cotlar's lemma - Coxeter element - Cremona transformation - Crofton formula - Cuspidal point of a surface - Cut locus - Crystalline cohomology - Cartan integer - Cartan involution - Cartan subgroup - Casimir polynomial - Central character - Central eigendistribution - Chevalley's criterion - Chevalley's restriction theorem - Class one representation - Closure of an operator - Compactification of a Riemannian symmetric space - Complete set of representations - Completely invariant set - Complex distance - Complex semisimple group - Complexification of a reductive group - Connection index - Contragrediant representation - co-root - countable at infinity - Coxeter-Killing transformation - Cuspidal parabolic subgroup - Cap-product - Cellular map - Chain homotopy - Characteristic map - Characteristic number - Closure-finite - Clutching function - Coaction of H-cogroup - Coexact sequence of spaces - Cofibre sequence - Cohomology theory associated with a spectrum - Cotensor product - CW-substitute - c-function - Coadjoint action - Coherence theorem -Calculus of two errors - Cech homology - Caratheodory conjecture - Clemens conjecture - Cherlin-Zilber conjecture - Canonical element conjecture - Chinburg conjecture - Connes-Kasparov conjecture - Coates-Sinnott conjecture - Connes-Kreimer conjecture
Cartan subgroup - Cartier dual - Chow scheme - CM-field - Complete reducibility - Cremona group -