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arXiv 2209.04784math.LO
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关于乘积在不可达基数上的近似钻石原理

Approximating diamond principles on products at an inaccessible cardinal

Omer Ben-Neria, Jing Zhang

摘要:

我们隔离\emph{the approximating diamond principles},这是钻石原则在不可达基数的后果。我们利用这些原则找到新的方法来否定钻石原则在大基数。最值得注意的是,我们证明,使用Gitik的重叠扩展强迫,一种新的方法来获得的钻石原则的失败在一个大基数$θ$的一致性,而不改变共尾性或添加快速俱乐部$θ$。此外,我们证明了近似钻石原则必然保持在一个弱紧基数。这一结果,结合在所有已知的模型中,钻石原则失败的近似钻石原则也失败在一个不可达基数的事实,表现出必要的组合障碍,使钻石原则失败在一个弱紧基数。

英文摘要:

We isolate \emph{the approximating diamond principles}, which are consequences of the diamond principle at an inaccessible cardinal. We use these principles to find new methods for negating the diamond principle at large cardinals. Most notably, we demonstrate, using Gitik's overlapping extenders forcing, a new method to get the consistency of the failure of the diamond principle at a large cardinal $θ$ without changing cofinalities or adding fast clubs to $θ$. In addition, we show that the approximating diamond principles necessarily hold at a weakly compact cardinal. This result, combined with the fact that in all known models where the diamond principle fails the approximating diamond principles also fail at an inaccessible cardinal, exhibits essential combinatorial obstacles to make the diamond principle fail at a weakly compact cardinal.

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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