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 Equivariant crossed modules and cohomology of groups with operators Bull. Korean Math. Soc. 2015 Vol. 52, No. 4, 1077-1095 https://doi.org/10.4134/BKMS.2015.52.4.1077Published online July 31, 2015 Pham Thi Cuc and Nguyen Tien Quang Hongduc University, Hanoi National University of Education Abstract : In this paper we study equivariant crossed modules in its link with strict graded categorical groups. The resulting Schreier theory for equivariant group extensions of the type of an equivariant crossed module generalizes both the theory of group extensions of the type of a crossed module and the one of equivariant group extensions. Keywords : $\Gamma$-crossed module, strict graded categorical group, regular graded monoidal functor, equivariant extension, equivariant cohomology MSC numbers : 18D10, 18D30, 20E22, 20J06 Downloads: Full-text PDF