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Simplicial Cohomology of Some Semigroup Algebras

Open Access article
 Printed: Mar 2007
  • F. Gourdeau
  • A. Pourabbas
  • M. C. White
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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 simplicial cohomology, semigroup algebra
MSC Classifications: 43A20 show english descriptions $L^1$-algebras on groups, semigroups, etc. 43A20 - $L^1$-algebras on groups, semigroups, etc.

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