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arXiv 2602.01739math.LO
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凸集与选择公理

Convex sets and Axiom of Choice

Nagoya University(名古屋大学)

Yasuo Yoshinobu

AI总结:

在ZF集合论中,研究了实向量空间子集的极大凸子集的存在性与选择公理的关系,特别指出R²和R³的情况分别等价于可数实数选择公理和均匀化公理。

摘要:

在ZF公理系统下,我们证明了每个实向量空间的每个子集都有极大凸子集的陈述等价于选择公理。我们还研究了该陈述在特定实向量空间上的强度。特别是,对于R²,该陈述等价于可数实数选择公理,而对于R³,等价于均匀化公理。我们还讨论了更高维空间中的相关陈述。

英文摘要:

Under $\mathrm{ZF}$, we show that the statement that every subset of every $\mathbb{R}$-vector space has a maximal convex subset is equivalent to the Axiom of Choice. We also study the strength of the same statement restricted to some specific $\mathbb{R}$-vector spaces. In particular, we show that the statement for $\mathbb{R}^2$ is equivalent to the Axiom of Countable Choice for reals, whereas the statement for $\mathbb{R}^3$ is equivalent to the Axiom of Uniformization. We discuss the statement for some spaces of higher dimensions as well.

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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