20Cxx Representation theory of groups

20C05  Group rings of finite groups and their modules, See Also {
               16S34}
20C07  Group rings of infinite groups and their modules, See Also {
               16S34}
20C10  Integral representations of finite groups
20C11  $p$-adic representations of finite groups
20C12  Integral representations of infinite groups
20C15  Ordinary representations and characters
20C20  Modular representations and characters
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
20C34  Representations of sporadic groups
20C35  Applications of group representations to physics
20C40  Computational methods
20C99  None of the above but in this section