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arXiv 1006.4776math.RA
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部分定义动力系统的斜范畴代数

Skew Category Algebras Associated with Partially Defined Dynamical Systems

Patrik Lundström, Johan Öinert

摘要:

我们引入定义在拓扑空间上的部分定义动力系统。对于每一个这样的系统,我们从一个范畴$G$到$\Top^{\op}$关联一个函子$s$,并证明它定义了我们所说的斜范畴代数$A \rtimes^σ G$。本文研究了$s$的拓扑自由性与$A \rtimes^σ G$的理想性质和$A \rtimes^σ G$中$A$的最大交换性之间的关系.特别地,我们证明了如果$G$是广群,且对每个$e \in \ob(G)$,所有态射的群$e \rightarrow e$是可数的,且拓扑空间$s(e)$是Tychonoff和Baire,则下列断言等价:(i)$s$是拓扑自由的;(ii)$A$具有理想交性质,即如果$I$是$A \rtimes^σ G$的非零理想,则$I \cap A \neq \{0\}$ ;(iii)环$A$是$A \rtimes^σ G$的极大阿贝尔复子代数.从而将Svensson,Silvestrov和de Jeu的一个结果从整数的加法群推广到一大类群胚。

英文摘要:

We introduce partially defined dynamical systems defined on a topological space. To each such system we associate a functor $s$ from a category $G$ to $\Top^{\op}$ and show that it defines what we call a skew category algebra $A \rtimes^σ G$. We study the connection between topological freeness of $s$ and, on the one hand, ideal properties of $A \rtimes^σ G$ and, on the other hand, maximal commutativity of $A$ in $A \rtimes^σ G$. In particular, we show that if $G$ is a groupoid and for each $e \in \ob(G)$ the group of all morphisms $e \rightarrow e$ is countable and the topological space $s(e)$ is Tychonoff and Baire, then the following assertions are equivalent: (i) $s$ is topologically free; (ii) $A$ has the ideal intersection property, that is if $I$ is a nonzero ideal of $A \rtimes^σ G$, then $I \cap A \neq \{0\}$; (iii) the ring $A$ is a maximal abelian complex subalgebra of $A \rtimes^σ G$. Thereby, we generalize a result by Svensson, Silvestrov and de Jeu from the additive group of integers to a large class of groupoids.

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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