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arXiv 2201.11622math.LO
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开着色公理

The Open Coloring Axiom

Tonatiuh Matos-Wiederhold

AI总结:

本文系统阐释了Todorcěvić提出的开着色公理,给出其若干应用,并通过一个技术性引理证明该公理与ZFC相对一致,同时证明它蕴含b=ℵ₂从而与连续统假设不相容。

摘要:

本文关注由Todorcěvić在文献[stevo]中引入的一条公理,该公理构成了一个关于实数拓扑的Ramsey型命题。我们的目标是详细解释该公理,给出一些有趣的应用,并最终证明该公理确实与ZFC相容,从而使得从一开始就考虑在其下工作是有意义的。就这一特定的学术工作而言,我们涵盖了集合论中的若干高级主题,包括Hausdorff间隙、力迫、无穷组合学以及少量拓扑学等概念。例如,我们采用了一个基于Rothberger定理的论证来证明开着色公理蕴含等式$\mathfrak b=\aleph_2$,这反过来使该公理与CH不相容。换言之,在ZFC中,开着色公理可能为假。为了证明其相对一致性,我们通过遵循Todorcěvić的一个相当长且技术性的引理来证明该公理可以为真,这构成了本文的高潮。

英文摘要:

This work is concerned with an axiom introduced by Todorcěvić in \cite{stevo} that constitutes a Ramsey-like statement regarding the topology of the reals. Our aim is to explain the axiom in detail, give some interesting applications and finally prove that the axiom is indeed consistent with ZFC, so that it makes sense to consider working with it in the first place. For this particular academic endeavor, we cover several advanced topics in set theory, including concepts like {\sl Hausdorff gaps}, forcing, infinitary combinatorics and a tad of topology. We employ, for example, an argument based on Rothberger's theorem to show that the Open Coloring Axiom implies the equality $\mathfrak b=\aleph_2$, which in turn makes this axiom inconsistent with CH. In other words, in ZFC, the Open Coloring Axiom could be false. To prove its relative consistency, we show that the axiom could be true by following a rather long and technical lemma of Todorcěvić, which leads to the culmination of this work.

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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