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arXiv 2406.12697math.DSmath.OA
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乘积中的小边界性质

The small boundary property in products

David Kerr, Hanfeng Li

AI总结:

本文刻画可数群连续作用的小边界性质,证明其与无有限轨道条件等价于对任意第二作用的乘积保持该性质,并以小边界版 Urysohn 引理证明。

摘要:

对于可数群在紧可度量化空间上的连续作用 $G\curvearrowright X$,我们证明以下条件等价:(i) 作用 $G\curvearrowright X$ 具有小边界性质且没有有限轨道;(ii) 对于可数群在紧可度量化空间上的每个连续作用 $H\curvearrowright Y$,乘积作用 $G\times H\curvearrowright X\times Y$ 都具有小边界性质。特别地,当 $G$ 无限且作用 $G\curvearrowright X$ 是极小的并具有小边界性质时,(ii) 自动成立。该论证依赖于 Urysohn 引理的小边界版本。

英文摘要:

For a continuous action $G\curvearrowright X$ of a countable group on a compact metrizable space we show that the following are equivalent: (i) the action $G\curvearrowright X$ has the small boundary property and no finite orbits, (ii) for every continuous action $H\curvearrowright Y$ of a countable group on a compact metrizable space, the product action $G\times H\curvearrowright X\times Y$ has the small boundary property. In particular, (ii) is automatic when $G$ is infinite and the action $G\curvearrowright X$ is minimal and has the small boundary property. The argument relies on a small boundary version of the Urysohn lemma.

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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