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arXiv 2009.09113math.COmath.LO
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局部有限图的Borel组合

Borel Combinatorics of Locally Finite Graphs

Oleg Pikhurko

摘要:

我们提供了一个温和的介绍,针对非专家,波莱尔组合学,研究可定义的图形上的拓扑空间。这是一个新兴的领域之间的边界组合学和描述集合论与许多其他领域的深刻联系。在给出一些背景材料后,我们仔细详细地介绍了一些基本的工具和结果的存在Borel满意的分配:Borel版本的贪婪算法和增广程序,局部规则,Borel横截,等。此外,我们提出了建设安德鲁马克的无环Borel图的贪婪界$Δ+1$上的Borel色数是最好的可能。在其余的文件,我们简要讨论了各种主题,如关系,以tagraphs算法,可衡量的版本霍尔的婚姻定理和Lovász局部引理,应用equidecomposability等。

英文摘要:

We provide a gentle introduction, aimed at non-experts, to Borel combinatorics that studies definable graphs on topological spaces. This is an emerging field on the borderline between combinatorics and descriptive set theory with deep connections to many other areas. After giving some background material, we present in careful detail some basic tools and results on the existence of Borel satisfying assignments: Borel versions of greedy algorithms and augmenting procedures, local rules, Borel transversals, etc. Also, we present the construction of Andrew Marks of acyclic Borel graphs for which the greedy bound $Δ+1$ on the Borel chromatic number is best possible. In the remainder of the paper we briefly discuss various topics such as relations to LOCAL algorithms, measurable versions of Hall's marriage theorem and of Lovász Local Lemma, applications to equidecomposability, etc.

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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