Chang’s Conjecture with $$\square _{\omega _1, 2}$$ from an $$\omega _1$$-Erdős cardinal
Chang’s Conjecture with $$\square _{\omega _1, 2}$$ from an $$\omega _1$$-Erdős cardinal
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张猜想 $$square _{omega _1, 2}$$ 来自 $$omega _1$$-ErdÅs 基数
DOI:
10.1007/s00153-020-00723-w
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发表时间:
2020
影响因子:
0.3
通讯作者:
Susice, John
中科院分区:
文献类型:
--
作者:
Neeman, Itay;Susice, John
Answering a question of Sakai (Arch Math Logic 52(1–2):29–45, 2013), we show that the existence of an-Erdős cardinal suffices to obtain the consistency of Chang’s Conjecture with. By a result of Donder (In: Set theory and model theory (Bonn, 1979), volume 872 of lecture notes in mathematics. Springer, Berlin, pp 55–97, 1981) this is best possible. We also give an answer to another question of Sakai relating to the incompatibility ofandfor uncountable.