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Indecomposable projective representations of direct products of finite groups over a ring of formal power series

Barannyk L. F.

Scientific Issues of Jan Długosz University in Częstochowa. Mathematics

2010

Vol. 15

9--24

Let F be a field of characteristic p > O, S = F[[X]] the ring of formal power series in the indeterminate X with coefficients in the field F, F* the multiplicative group of F, G = Gp x B a finite group, where Gp is a p-group and B is a p'-group. We give necessary and sufficient conditions for G and F under which there exists a cocycle λ ∈ Z2 (G, F*) such that every indecomposable projective 5-representation of G with the cocycle λ is the outer tensor product of an indecomposable projective 5-representation of Gp and an irreducible projective 5-representation of B.