Semigroup cohomology and applications

Details Semigroup cohomology and applications Semigroup cohomology and applications

2008-03-04

arxiv.org/abs/0803.0463v1

Algebra-Representation theory, NATO Sci. Ser. II, 28, Kluwer, 2001, 219-234

Mathematics

Rings and Algebras

16 pages, Latex

Scientific paper

This article is a survey of the author's research. It consists of three sections concerned three kinds of cohomologies of semigroups. Section 1 considers `classic' cohomology as it was introduced by Eilenberg and MacLane. Here the attention is concentrated mainly on semigroups having cohomological dimension 1. In Section 2 a generalization of the Eilenberg-MacLane cohomology is introduced, the so-called 0-cohomology, which appears in applied topics (projective representations of semigroups, Brauer monoids). At last Section 3 is devoted to further generalizing: partial cohomology defined and discussed in it are used then for calculation of the classic cohomology for some semigroups.

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