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arXiv 2601.04417math.LO
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可Borel图化的等价关系及其无直径小于3的Borel图化

A Borel graphable equivalence relation with no Borel graphing of diameter two

University of Michigan(密歇根大学)

Patrick Lutz

AI总结:

本文研究了一种可Borel图化的等价关系,证明其不存在直径小于3的Borel图化,且通过计算论通用性引理得出结论。

摘要:

我们回答了Arant、Kechris和Lutz提出的问题,证明存在一个可Borel图化的等价关系,其没有直径小于3的Borel图化。更具体地说,我们证明存在一个等价关系,其具有直径至多为4的Borel图化,但没有直径小于3的Borel图化。我们的证明依赖于一个关于计算论通用性的技术引理,这可能有其他应用。

英文摘要:

We answer a question of Arant, Kechris and Lutz by showing that there is a Borel graphable equivalence relation with no Borel graphing of diameter less than 3. More specifically, we prove that there is an equivalence relation with a Borel graphing of diameter at most 4 but no Borel graphing of diameter less than 3. Our proof relies on a technical lemma about computability-theoretic genericity, which may have other applications.

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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