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arXiv math/0003118math.LO
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奇异后继弱反射

Weak reflection at the successor of singular

Mirna Džamonja, Saharon Shelah

摘要:

平稳反射的概念是组合集合论中最重要的概念之一。我们研究弱反射,这是,顾名思义,一个弱版本的平稳反射。在[DjSh:545](math. LO/9601219)中介绍了这种反射,其中表明弱反射可应用于各种猜测原理,在这个意义上,如果不存在弱反射,则猜测原理成立,并且应用于处理正常滤波器的饱和。在[CDSh:571](数学LO/9504221)和[CuSh:596](数学LO/9703219)中进行了弱反射的进一步研究。虽然各种ZFC的限制,另一方面,独立的结果,发现了关于弱反射,问题的相对兼容性的存在,一个正规的基数kappa,使第一个基数弱反射在kappa是一个继任者的奇异,仍然开放。本文回答了这个问题,证明(模大基数假设接近2-hugeness),确实可以有这样一个基数卡帕。

英文摘要:

The notion of stationary reflection is one of the most important notions of combinatorial set theory. We investigate weak reflection, which is, as the name suggests, a weak version of stationary reflection. This sort of reflection was introduced in [DjSh:545] (math.LO/9601219), where it was shown that weak reflection has applications to various guessing principles, in the sense that if there is no weak reflection, than a guessing principle holds, and an application dealing with the saturation of normal filters. Further investigations of weak reflection were carried in [CDSh:571] (math.LO/9504221) and [CuSh:596] (math.LO/9703219). While various ZFC restrictions on the one hand, and independence results on the other, were discovered about the weak reflection, the question of the relative consistency of the existence of a regular cardinal kappa such that the first cardinal weakly reflecting at kappa is a successor of singular, remained open. This paper answers that question by proving that (modulo large cardinal assumptions close to 2-hugeness) that there indeed can be such a cardinal kappa.

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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