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arXiv 2005.08714math.RAmath.CTmath.OA
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逆半群的覆盖

Coverages on Inverse Semigroups

Gilles G. de Castro

摘要:

首先给出了逆半群上的覆盖的一个定义,它比Lawson和Lenz给出的定义弱,推广了Johnstone给出的半格上的覆盖的定义。给定这样的覆盖,我们证明了存在一个伪群,是普遍的意义上说,它转换覆盖到连接幂等纯映射到幂等纯伪群同态。然后,我们展示了如何从伪群上的核到相应群胚的拓扑群胚嵌入。最后,我们将研究结果Exel的概念紧过滤器和紧广群。

英文摘要:

First we give a definition of a coverage on a inverse semigroup that is weaker than the one gave by a Lawson and Lenz and that generalizes the definition of a coverage on a semilattice given by Johnstone. Given such a coverage, we prove that there exists a pseudogroup that is universal in the sense that it transforms cover-to-join idempotent-pure maps into idempotent-pure pseudogroup homomorphisms. Then, we show how to go from a nucleus on a pseudogroup to a topological groupoid embedding of the corresponding groupoids. Finally, we apply the results found to study Exel's notions of tight filters and tight groupoids.

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