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- W2143491612 abstract "We give an elementary proof of the well-known fact that the third cohomology group H 3 (G;M) of a group G with coecients in an abelian G-module M is in bijection to the set Ext 2 (G;M) of equivalence classes of crossed module extensions of G with M." @default.
- W2143491612 created "2016-06-24" @default.
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- W2143491612 date "2009-11-15" @default.
- W2143491612 modified "2023-09-27" @default.
- W2143491612 title "The third cohomology group classifies crossed module extensions" @default.
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