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arXiv 1912.03335math.LO
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Sigma-Prikry强迫I:公理

Sigma-Prikry forcing I: The Axioms

Alejandro Poveda, Assaf Rinot, Dima Sinapova

摘要:

我们引入了一类强迫的概念,我们称之为$Σ$ -Prikry,并表明,许多已知的Prikry型强迫中心周围的可数共尾奇异基数的概念是$Σ$ -Prikry。我们证明了给定一个$Σ$ -Prikry偏序集$\mathbb P$和一个非反射平稳集$T$的名称,存在一个相应的$Σ$ -Prikry偏序集,它投射到$\mathbb P$并杀死$T$的平稳性.然后,在本文的续集,我们开发了一个迭代计划的$Σ$ -Prikry偏序集。把这两个作品放在一起,我们得到了以下证明。定理如果$κ$是超紧基数列的可数增序列的极限,则存在保共尾的力迫扩张,其中$κ$保持强极限,$κ^+$的每个有限集的平稳子集同时反映,并且$2^κ=κ^{++}$ .

英文摘要:

We introduce a class of notions of forcing which we call $Σ$-Prikry, and show that many of the known Prikry-type notions of forcing that centers around singular cardinals of countable cofinality are $Σ$-Prikry. We show that given a $Σ$-Prikry poset $\mathbb P$ and a name for a non-reflecting stationary set $T$, there exists a corresponding $Σ$-Prikry poset that projects to $\mathbb P$ and kills the stationarity of $T$. Then, in a sequel to this paper, we develop an iteration scheme for $Σ$-Prikry posets. Putting the two works together, we obtain a proof of the following. Theorem. If $κ$ is the limit of a countable increasing sequence of supercompact cardinals, then there exists a cofinality-preserving forcing extension in which $κ$ remains a strong limit, every finite collection of stationary subsets of $κ^+$ reflects simultaneously, and $2^κ=κ^{++}$.

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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