一类半群代数超中心近似恒等式的存在性
On the existence of an ultra central approximate identity for certain semigroup algebras
摘要:
本文刻画了$\ell^{1}(S)$的超中心近似恒等式的存在性,其中$S$是一致局部有限逆半群.作为应用,对非空集$I$上的Brandt半群$S=M^{0}(G,I)$,我们证明了$\ell^{1}(S)$有超中心近似恒等式当且仅当$I$是有限的.
英文摘要:
In this paper we characterize the existance of an ultra central approximate identity for $\ell^{1}(S)$, where $S$ is a uniformly locally finite inverse semigroup. As an application, for the Brandt semigroup $S=M^{0}(G,I)$ over a non-empty set $I$, we show that $\ell^{1}(S)$ has an ultra central approximate identity if and only if $I$ is finite.
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