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arXiv 1912.03336math.LO
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Sigma-Prikry强迫II:迭代方案

Sigma-Prikry forcing II: Iteration Scheme

Alejandro Poveda, Assaf Rinot, Dima Sinapova

摘要:

在本系列的第一部分中,我们介绍了一类我们称之为Sigma-Prikry的强迫概念,并证明了许多已知的以可数共尾性的奇异基数为中心的强迫概念都是Sigma-Prikry。我们证明了,给定一个Sigma-Prikry偏序集P和一个非反射平稳集T的P-名称,存在一个对应的Sigma-Prikry偏序集,它投射到P并杀死T的平稳性。在本文中,我们发展了一个迭代Sigma-Prikry偏序集的一般方案,作为应用,我们爆破了Laver-不可破坏超紧基数的可数极限的幂,然后迭代地杀死其后继者的所有非反射平稳子集。这产生了一个模型,其中的奇异基数假设失败,同时反映有限家庭的固定集举行。

英文摘要:

In Part I of this series, we introduced a class of notions of forcing which we call Sigma-Prikry, and showed that many of the known Prikry-type notions of forcing that center around singular cardinals of countable cofinality are Sigma-Prikry. We showed that given a Sigma-Prikry poset P and a P-name for a non-reflecting stationary set T, there exists a corresponding Sigma-Prikry poset that projects to P and kills the stationarity of T. In this paper, we develop a general scheme for iterating Sigma-Prikry posets and, as an application, we blow up the power of a countable limit of Laver-indestructible supercompact cardinals, and then iteratively kill all non-reflecting stationary subsets of its successor. This yields a model in which the singular cardinal hypothesis fails and simultaneous reflection of finite families of stationary sets holds.

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