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Second nonabelian group cohomology: cocycles vs. gerbes

The cocycle data which you review together is a map of 2-groupoids $B \Gamma \to B Aut(B G)$ to the delooping of the automorphism 2-group "of $G$" (really: of $BG$). As for any cocycle with coefficien …
Urs Schreiber's user avatar