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Lookup NU author(s): Dr Frederic Gourdeau,
Professor Barry Johnson,
Dr Michael White
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Let A= l1(Z+) be the unital semigroup algebra of N. We show that the cyclic cohomology groups ℋCn(A, A′) vanish when n is odd and are one dimensional when n is even (n ≥ 2). Using Connes' exact sequence, these results are used to show that the simplicial cohomology groups ℋn(A, A′) vanish for n ≥ 2. The results obtained are extended to unital algebras l1(S) for some other semigroups of R. © 2005 American Mathematical Society.
Author(s): Gourdeau F, Johnson BE, White MC
Publication type: Article
Publication status: Published
Journal: Transactions of the American Mathematical Society
Print publication date: 01/12/2005
ISSN (print): 0002-9947
ISSN (electronic): 1088-6850
Publisher: American Mathematical Society
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