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arXiv 2403.01337math.OA
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高阶图在群胚中的可嵌入性及其 C*-代数的结构

Embeddability of higher-rank graphs in groupoids, and the structure of their C*-algebras

Nathan Brownlowe, Alex Kumjian, David Pask, Aidan Sims

AI总结:

本文研究行有限无源 k-图的 C*-代数结构,证明其与 AF 代数交叉积 Morita 等价,并刻画可嵌入基本群胚的条件及交换情形。

摘要:

我们证明了行有限且无源的 k-图的 C*-代数与一个 AF 代数被该 k-图的基本群所作的交叉积 Rieffel–Morita 等价。当该 k-图可嵌入其基本群胚时,这个 AF 代数是 Fell 代数;而某个子 1-图的单连通性刻画了该 Fell 代数何时与一个交换 C*-代数 Rieffel–Morita 等价。我们给出了一整套重要结果,用于判定给定 k-图是否可嵌入其基本群胚,并借助 Cartwright、Robertson、Steger 等人源于 $\ ilde{A_2}$ 群理论的工作,提供了一大类确实可嵌入的例子。

英文摘要:

We show that the C*-algebra of a row-finite source-free k-graph is Rieffel-Morita equivalent to a crossed product of an AF algebra by the fundamental group of the k-graph. When the k-graph embeds in its fundamental groupoid, this AF algebra is a Fell algebra; and simple-connectedness of a certain sub-1-graph characterises when this Fell algebra is Rieffel--Morita equivalent to a commutative C*-algebra. We provide a substantial suite of results for determining if a given k-graph embeds in its fundamental groupoid, and provide a large class of examples, arising via work of Cartwright, Robertson, Steger et al. from the theory of $\tilde{A_2}$-groups, that do embed.

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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