Semiproper forcing axiom implies Martin maximum but not PFA+
Semiproper forcing axiom implies Martin maximum but not PFA+
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半适当的强迫公理意味着 Martin 最大值,但不是 PFA
DOI:
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发表时间:
1987
期刊:
影响因子:
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通讯作者:
S. Shelah
中科院分区:
文献类型:
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作者:
S. Shelah
Abstract We prove that MM (Martin maximum) is equivalent (in ZFC) to the older axiom SPFA (semiproper forcing axiom). We also prove that SPFA does not imply SPFA+ or even PFA+ (using the consistency of a large cardinal).