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arXiv 1503.06703math.LO
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*变化的Banach-Mazur游戏与forcing公理

The *-variation of the Banach-Mazur game and forcing axioms

Nagoya University(名古屋大学)

Yasuo Yoshinobu

AI总结:

本文提出一种加强(ω_1+1)-strategic closedness的poset性质,并证明PFA在特定forcing下的保持性,同时应用该性质重新证明了PFA与弱square原理的一致性。

摘要:

我们介绍了一个poset的性质,该性质加强了(ω_1+1)-strategic closedness。这个性质是通过在poset上的一种Banach-Mazur游戏的变种来定义的,其中第一个玩家在每次回合中选择一个可数集的条件,而不是单个条件。我们证明PFA在任何对具有此性质的poset的forcing下都得以保持。作为应用,我们重新证明了Magidor关于PFA与某些弱化的square原理一致性的定理。我们还通过观察MA^+(ω_1-closed)的哪些部分在具有这两种性质的poset上的forcing下被保留或破坏,来论证该性质与(ω_1+1)-operational closedness的不同之处。

英文摘要:

We introduce a property of posets which strengthens (ω_1+1)-strategic closedness. This property is defined using a variation of the Banach-Mazur game on posets, where the first player chooses a countable set of conditions instead of a single condition at each turn. We prove PFA is preserved under any forcing over a poset with this property. As an application we reproduce a proof of Magidor's theorem about the consistency of PFA with some weak variations of the square principles. We also argue how different this property is from (ω_1+1)-operational closedness, which we introduced in our previous work, by observing which portions of MA^+(ω_1-closed) are preserved or destroyed under forcing over posets with either property.

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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