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arXiv 1607.02575math.DSmath.GRmath.NT
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amenable groups遍历作用的近似不变性

Approximate invariance for ergodic actions of amenable groups

Michael Björklund, Alexander Fish

摘要:

本文发展了一些分析顺从群的保持概率测度作用的小加倍作用集的一般方法。作为这些技术的应用,我们证明了动态推广Kneser的著名的密度定理的子集在$(\bZ,+)$,有效的任何可数服从组,我们展示了它如何可以用来建立一个新的逆积集定理的上,下渐近密度。我们提供了几个例子,证明我们的结果是最佳的设置下研究。

英文摘要:

We develop in this paper some general techniques to analyze action sets of small doubling for probability measure-preserving actions of amenable groups. As an application of these techniques, we prove a dynamical generalization of Kneser's celebrated density theorem for subsets in $(\bZ,+)$, valid for any countable amenable group, and we show how it can be used to establish a plethora of new inverse product set theorems for upper and lower asymptotic densities. We provide several examples demonstrating that our results are optimal for the settings under study.

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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