关于难波强迫和最小坍塌

Maxwell Levine
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摘要

我们以布科夫斯基和科普拉科娃-哈托娃 1990 年的一篇论文为基础。首先,我们从他们的一个最小性结果中删除了$\textsf{CH}$的假设。然后,我们用一个可测的红心证明,有一个$|\aleph_2^V|=\aleph_1$最小扩展不是$|\aleph_3^V|=\aleph_1$扩展,从而回答了他们的第一个问题。
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On Namba Forcing and Minimal Collapses
We build on a 1990 paper of Bukovsky and Coplakova-Hartova. First, we remove the hypothesis of $\textsf{CH}$ from one of their minimality results. Then, using a measurable cardinal, we show that there is a $|\aleph_2^V|=\aleph_1$-minimal extension that is not a $|\aleph_3^V|=\aleph_1$-extension, answering the first of their questions.
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