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arXiv 1105.4017math.GR
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Thompson群F在单位区间和康托尔集上作用的Schreier图

Schreier graphs of actions of Thompson's group F on the unit interval and on the Cantor set

Dmytro Savchuk

摘要:

明确地构造了Thompson群$F$在单位区间上所有点的轨道上的作用和康托尔集关于标准生成集$\{x_0,x_1\}$的作用的Schreier图.描述了$F$作用在并元有理数轨道上的点Schreier图空间的封闭性及相应的Schreier动力系统.特别是,我们回答的问题Grigorchuk的Cantor-Bendixson秩的基础空间的Schreier动力系统的上下文中的$F$。作为应用,我们证明了由$(0,1)$中的点构成的点Schreier图是顺从的,有无穷多个端点,并且是两两不同构的.证明了点$x,y\in(0,1)$具有同构的非点Schreier图当且仅当它们属于$F$的同一轨道.

英文摘要:

Schreier graphs of the actions of Thompson's group $F$ on the orbits of all points of the unit interval and of the Cantor set with respect to the standard generating set $\{x_0,x_1\}$ are explicitly constructed. The closure of the space of pointed Schreier graphs of the action of $F$ on the orbits of dyadic rational numbers and corresponding Schreier dynamical system are described. In particular, we answer the question of Grigorchuk on the Cantor-Bendixson rank of the underlying space of the Schreier dynamical system in the context of $F$. As applications we prove that the pointed Schreier graphs of points from $(0,1)$ are amenable, have infinitely many ends, and are pairwise non-isomorphic. Moreover, we prove that points $x,y\in(0,1)$ have isomorphic non-pointed Schreier graphs if and only if they belong to the same orbit of $F$.

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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