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jandan.net
28 天
数学家发现新的无穷大
然而,它们挑战了关于无限强公理的常规直觉。 我们证明,“超精确基数”在存在I₀嵌入的假设下,与包含选择公理(ZFC)的Zermelo-Fraenkel集合论是相容的。然而,如果一个可测基数以下存在超精确基数,这将意味着ZFC与包含适当类I₀嵌入的一致性,从而挑战了大 ...
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