arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.04074math.LO
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带滤子的博弈

Games with Filters

Matthew Foreman, Menachem Magidor, Martin Zeman

AI总结:

本文研究 Welch 博弈变体,证明玩家 II 在不同长度博弈中获胜与大基数性质的等价关系,并构造模型展示这些结果非空且具有中间长度的区分性。

摘要:

本文分为两部分。第一部分研究由 Holy 和 Schlicht 引入的一类博弈的变体,我们称之为 Welch 博弈。玩家 II 在 $κ$ 上长度为 $ω$ 的 Welch 博弈中拥有获胜策略,等价于弱紧致性。赢得长度为 $2^κ$ 的博弈等价于 $κ$ 是可测的。我们证明,对于中间长度 $γ$ 的博弈,II 获胜蕴含存在带有 $γ$-闭、$γ$-稠密树的 precipitous ideals。第二部分证明第一部分并非无意义。对于 $ω$ 和 $κ^+$ 之间的每个 $γ$,它给出了一个模型,其中 II 赢得长度为 $γ$ 的博弈,但不赢得 $γ^+$ 的博弈。该技术还给出了这样的模型:对于所有 $ω_1< γ≤κ$,存在 $κ$-完全、正规、$κ^+$-分配的 ideals,其稠密集是 $γ$-闭的,但不是 $γ^+$-闭的。

英文摘要:

This paper has two parts. The first is concerned with a variant of a family of games introduced by Holy and Schlicht, that we call \emph{Welch games}. Player II having a winning strategy in the Welch game of length $ω$ on $κ$ is equivalent to weak compactness. Winning the game of length $2^κ$ is equivalent to $κ$ being measurable. We show that for games of intermediate length $γ$, II winning implies the existence of precipitous ideals with $γ$-closed, $γ$-dense trees. The second part shows the first is not vacuous. For each $γ$ between $ω$ and $κ^+$, it gives a model where II wins the games of length $γ$, but not $γ^+$. The technique also gives models where for all $ω_1< γ\leκ$ there are $κ$-complete, normal, $κ^+$-distributive ideals having dense sets that are $γ$-closed, but not $γ^+$-closed.

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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