arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1802.02513math.DSmath.GRmath.LO
收藏

Fraïssé结构与Furstenberg猜想

Fraïssé structures and a conjecture of Furstenberg

Dana Bartošová, Andy Zucker

摘要:

研究可数一阶结构的自同构群的Samuel紧化问题。一个关键的激励问题是一个问题的弗斯滕伯格和反猜想佩斯托夫之间的差异$S(G)$,塞缪尔紧化,和$E(M(G))$,包络半群的普遍最小流。我们解决了Furstenberg问题的几个自同构群和$G = S_\infty$的情况下进行了详细的研究,导致我们定义和研究可数集上的几种新类型的超滤子。

英文摘要:

We study problems concerning the Samuel compactification of the automorphism group of a countable first-order structure. A key motivating question is a problem of Furstenberg and a counter-conjecture by Pestov regarding the difference between $S(G)$, the Samuel compactification, and $E(M(G))$, the enveloping semigroup of the universal minimal flow. We resolve Furstenberg's problem for several automorphism groups and give a detailed study in the case of $G = S_\infty$, leading us to define and investigate several new types of ultrafilter on a countable set.

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。

↑