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arXiv 2408.01547math.LO
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凯托内的问题及其他基数罪孽

Ketonen's question and other cardinal sins

Assaf Rinot, Zhixing You, Jiachen Yuan

AI总结:

本文通过分析ZFC模型的极限,证明弱康托尔基数携带不可分解超滤子不必可测,并解决其他两个关于强紧性和C序列数的问题。

摘要:

回答凯托恩在1970年代末提出的问题,证明了一个弱康托尔基数携带不可分解的超滤子并不需要是可测的。该结果通过分析ZFC模型的递减序列的极限获得。本文进一步展示了这种证明技术的实用性,其中还解决了Bagaria和Magidor关于强紧性的问题,以及Lambie-Hanson和Rinot关于C序列数的问题。

英文摘要:

Answering a question of Ketonen from the late 1970's, it is proved that a weakly compact cardinal carrying an indecomposable ultrafilter need not be measurable. The result is obtained by analyzing the limit of a decreasing sequence of models of ZFC. The utility of this proof technique is demonstrated further in this paper, where a problem by Bagaria and Magidor concerning strong compactness, and a problem by Lambie-Hanson and Rinot concerning the $C$-sequence number are solved 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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