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1. CMB 2007 (vol 50 pp. 56)

Gourdeau, F.; Pourabbas, A.; White, M. C.
Simplicial Cohomology of Some Semigroup Algebras
In this paper, we investigate the higher simplicial cohomology groups of the convolution algebra $\ell^1(S)$ for various semigroups $S$. The classes of semigroups considered are semilattices, Clifford semigroups, regular Rees semigroups and the additive semigroups of integers greater than $a$ for some integer $a$. Our results are of two types: in some cases, we show that some cohomology groups are $0$, while in some other cases, we show that some cohomology groups are Banach spaces.

Keywords:simplicial cohomology, semigroup algebra

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