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arXiv 1504.07183math.GR
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左均衡单半群

Left equalizer simple semigroups

Attila Nagy

摘要:

本文刻画并构造了右正则表示为左可消半群的半群。这些半群称为左均衡单半群。对于半群$S$上的同余$\varrho$,令${\mathbb F}[\varrho]$表示半群代数${\mathbb F}[S]$的理想,该理想决定了由$S$到$S/\varrho$上的标准同态导出的${\mathbb F}[S]$到${\mathbb F}[S/\varrho]$上的扩展同态的核.我们研究了右冒号$({\mathbb F}[\varrho]:_r{\mathbb F}[S])=\{ a\in {\mathbb F}[S]:\ {\mathbb F}[S]a\subseteq {\mathbb F}[\varrho ]\}$的一般情况,并在特殊情况下,当$\varrho$具有的性质,因子半群$S/\varrho$是左均衡简单。

英文摘要:

In this paper we characterize and construct semigroups whose right regular representation is a left cancellative semigroup. These semigroups will be called left equalizer simple semigroups. For a congruence $\varrho$ on a semigroup $S$, let ${\mathbb F}[\varrho]$ denote the ideal of the semigroup algebra ${\mathbb F}[S]$ which determines the kernel of the extended homomorphism of ${\mathbb F}[S]$ onto ${\mathbb F}[S/\varrho]$ induced by the canonical homomorphism of $S$ onto $S/\varrho$. We examine the right colons $({\mathbb F}[\varrho]:_r{\mathbb F}[S])=\{ a\in {\mathbb F}[S]:\ {\mathbb F}[S]a\subseteq {\mathbb F}[\varrho ]\}$ in general, and in that special case when $\varrho$ has the property that the factor semigroup $S/\varrho$ is left equalizer simple.

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