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arXiv 1909.07458math.LO
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函数集的高维基数特征

Higher Dimensional Cardinal Characteristics for Sets of Functions

Corey Bacal Switzer

摘要:

最近在基数特征上的许多工作都集中在通过研究在广义Baire和Cantor空间$κ^κ$和$2^κ$上的经典基数特征的类似物来将关于$ω$的结果推广到不可数基数上。在这篇笔记中,我将研究对其他函数空间的推广,特别关注函数空间$f:ω^ω\to ω^ω$。通过考虑经典的基数不变量在贝尔空间在这种情况下,我得出了一些“高维”的类似物,这样的红衣主教,最终引入18个新的基数不变量,旁边的框架,允许许多其他。这18张图分别由6位和12位枢机组成,每一张都类似于奇乔维图的版本。这些ZFC-不等式是本文的第一个主要结果。然后,我考虑这些基数之间的其他关系,以及基数$\mathfrak{c}^+$,并表明这些结果依赖于额外的假设$ω$的基数特征。最后,使用变化的科恩,Hechler,和本地化迫使我证明了一些新的基数的可能值的一致性结果。

英文摘要:

Much recent work in cardinal characteristics has focused on generalizing results about $ω$ to uncountable cardinals by studying analogues of classical cardinal characteristics on the generalized Baire and Cantor spaces $κ^κ$ and $2^κ$. In this note I look at generalizations to other function spaces, focusing particularly on the space of functions $f:ω^ω\to ω^ω$. By considering classical cardinal invariants on Baire space in this setting I derive a number of "higher dimensional" analogues of such cardinals, ultimately introducing 18 new cardinal invariants, alongside a framework that allows for numerous others. These 18 form two separate diagrams consisting of 6 and 12 cardinals respectively, each resembling versions of the Cichoń diagram. These ZFC-inequalities are the first main result of the paper. I then consider other relations between these cardinals, as well as the cardinal $\mathfrak{c}^+$ and show that these results rely on additional assumptions about cardinal characteristics on $ω$. Finally, using variations of Cohen, Hechler, and localization forcing I prove a number of consistency results for possible values of the new cardinals.

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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