More forcing notions imply diamond

More forcing notions imply diamond
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更多强迫观念意味着钻石

DOI:
10.1007/s001530050047
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发表时间:
1994
影响因子:
0.3
通讯作者:
S. Shelah
S. Shelah
中科院分区:
数学4区
文献类型:
--
作者:
A. Roslanowski;S. Shelah

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摘要。我们证明了萨克斯力将连续体坍缩到
Abstract.We prove that the Sacks forcing collapses the continuum onto ${\frak d}$, answering the question of Carlson and Laver. Next we prove that if a proper forcing of the size at most continuum collapses $\omega_2$ then it forces $\diamondsuit_{\omega_{1}}$.