arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1306.5388math.GRmath.RA
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拓扑图逆半群

Topological Graph Inverse Semigroups

Z. Mesyan, J. D. Mitchell, M. Morayne, Y. H. Péresse

摘要:

对于每个有向图$E$,可以关联\emph{graph inverse semigroup} $G(E)$,其中元素大致对应于$E$中的可能路径。这些半群推广了多圈幺半群,它们出现在Leavitt路代数、Cohn路代数、Cuntz-Krieger $C^*$ -代数和Toeplitz $C^*$ -代数的研究中。我们研究的拓扑结构,把$G(E)$到一个拓扑半群。例如,我们表明,在任何这样的拓扑结构是Hausdorff,$G(E)\setminus \{0\}$必须是离散的任何有向图$E$。另一方面,$G(E)$在Hausdorff半群拓扑中不需要是离散的,并且对于某些图$E$,$G(E)$允许一个$T_1$半群拓扑,其中$G(E)\setminus \{0\}$不是离散的。我们还描述了,在各种情况下,代数结构和可能的基数的封闭的$G(E)$在较大的拓扑半群。

英文摘要:

To every directed graph $E$ one can associate a \emph{graph inverse semigroup} $G(E)$, where elements roughly correspond to possible paths in $E$. These semigroups generalize polycylic monoids, and they arise in the study of Leavitt path algebras, Cohn path algebras, Cuntz-Krieger $C^*$-algebras, and Toeplitz $C^*$-algebras. We investigate topologies that turn $G(E)$ into a topological semigroup. For instance, we show that in any such topology that is Hausdorff, $G(E)\setminus \{0\}$ must be discrete for any directed graph $E$. On the other hand, $G(E)$ need not be discrete in a Hausdorff semigroup topology, and for certain graphs $E$, $G(E)$ admits a $T_1$ semigroup topology in which $G(E)\setminus \{0\}$ is not discrete. We also describe, in various situations, the algebraic structure and possible cardinality of the closure of $G(E)$ in larger topological semigroups.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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