K-theory 28 Homology theory 5 Geometry, Algebraic 3 Algebra, Homological 2 Algebraic number theory 2 Associative rings 2 Categories (Mathematics) 2 Finite groups 2 Index theory (Mathematics) 2 Operator algebras 2 Surgery (Topology) 2 Topological transformation groups 2 Algebraic fields 1 Algebraic varieties 1 Arithmetic 1 C*-algebras 1 Cobordism theory 1 Commutative rings 1 Functions of complex variables 1 Functor theory 1 Galois theory 1 Geometry 1 Grothendieck groups 1 Hodge theory 1 Integral representations 1 KK-theory 1 Lie groups 1 Ordered fields 1 Rings (Algebra) 1 Spectral sequences (Mathematics) 1