Generic central extensions and projective representations of finite groups

Author:

Quinlan Rachel

Abstract

Any free presentation for the finite group G G determines a central extension ( R , F ) (R,F) for G G having the projective lifting property for G G over any field k k . The irreducible representations of F F which arise as lifts of irreducible projective representations of G G are investigated by considering the structure of the group algebra k F kF , which is greatly influenced by the fact that the set of torsion elements of F F is equal to its commutator subgroup and, in particular, is finite. A correspondence between projective equivalence classes of absolutely irreducible projective representations of G G and F F -orbits of absolutely irreducible characters of F F’ is established and employed in a discussion of realizability of projective representations over small fields.

Publisher

American Mathematical Society (AMS)

Subject

Mathematics (miscellaneous)

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Twisted group rings of metacyclic groups;Representation Theory of the American Mathematical Society;2003-06-26

2. Very Simple Representations: Variations on a Theme of Clifford;Developments in Mathematics

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