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arXiv math/0609450math.FAmath.CTmath.RA
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巴拿赫代数强半格的单同调

Simplicial homology of strong semilattices of Banach algebras

Yemon Choi

摘要:

已知某些半群允许一个“强半格分解”为更简单的部分。引入了一类巴拿赫代数,推广了这类半群的$\ell^1$ -卷积代数,并得到了它们的单同调分解定理.利用这一点,我们表明,任何Clifford半群$S$的顺从群,$\lp{1}(S)$是简单平凡的:这推广了结果\cite{YC_GMJ}。一些其他的应用。

英文摘要:

Certain semigroups are known to admit a `strong semilattice decomposition' into simpler pieces. We introduce a class of Banach algebras that generalise the $\ell^1$-convolution algebras of such semigroups, and obtain a disintegration theorem for their simplicial homology. Using this we show that for any Clifford semigroup $S$ of amenable groups, $\lp{1}(S)$ is simplicially trivial: this generalises results in \cite{YC_GMJ}. Some other applications are presented.

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