20Cxx Representation theory of groups [See also 19A22 (for representation rings and Burnside rings)]
 20C05 Group rings of finite groups and their modules [See also 16S34]
 20C07 Group rings of infinite groups and their modules [See also 16S34]
 20C08 Hecke algebras and their representations
 20C10 Integral representations of finite groups
 20C11 padic representations of finite groups
 20C12 Integral representations of infinite groups

20C15 Ordinary representations and characters
(2)

20C20 Modular representations and characters
(1)
 20C25 Projective representations and multipliers
 20C30 Representations of finite symmetric groups
 20C32 Representations of infinite symmetric groups

20C33 Representations of finite groups of Lie type
(3)
 20C34 Representations of sporadic groups
 20C35 Applications of group representations to physics
 20C40 Computational methods
 20C99 None of the above, but in this section