Abstract
Short exact sequences of groups are introduced, and their isomorphism classes are identified with the second cohomology group of an appropriate cochain complex.
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Penner, R. (2020). Group Extensions and Cohomology. In: Topology and K-Theory. Lecture Notes in Mathematics(), vol 2262. Springer, Cham. https://doi.org/10.1007/978-3-030-43996-5_1
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DOI: https://doi.org/10.1007/978-3-030-43996-5_1
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Online ISBN: 978-3-030-43996-5
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