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arXiv 2008.08471math.DSmath.GRmath.LO
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超越波兰群的拓扑动力学

Topological dynamics beyond Polish groups

Gianluca Basso, Andy Zucker

摘要:

当$G$是一个波兰群时,泛最小流的度量化性已被证明是$G$拓扑动力学复杂性的一个鲁棒分界线.我们引入一类群,CAP群,它提供了一个整洁的推广这条分界线的所有拓扑群。我们证明了这个类的一些特征,有非常不同的口味,并使用这些来证明一类的CAP组享有一些很好的封闭性。作为一个具体的应用,我们在Gheysens最近工作的基础上,计算了几个离散拓扑空间的同胚群的泛极小流。

英文摘要:

When $G$ is a Polish group, metrizability of the universal minimal flow has been shown to be a robust dividing line in the complexity of the topological dynamics of $G$. We introduce a class of groups, the CAP groups, which provides a neat generalization of this dividing line to all topological groups. We prove a number of characterizations of this class, having very different flavors, and use these to prove that the class of CAP groups enjoys a number of nice closure properties. As a concrete application, we compute the universal minimal flow of the homeomorphism groups of several scattered topological spaces, building on recent work of Gheysens.

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