When a relation with all Borel sections will be Borel somewhere?
When a relation with all Borel sections will be Borel somewhere?
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当与所有 Borel 部分的关系将在某处成为 Borel 时?
DOI:
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发表时间:
2021
影响因子:
1
通讯作者:
M. Magidor
中科院分区:
文献类型:
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作者:
William Chan;M. Magidor
In ZFC, if there is a measurable cardinal with infinitely many Woodin cardinals below it, then for every binary relation R ∈ L(R) on R with all sections ∆1 (Σ1 or Π1) and every σ-ideal I on R so that the associated forcing PI of I+ ∆1 subsets is proper, there exists some I+ ∆1 set C so that R∩ (C ×R) is ∆1 (Σ 1 1 or Π 1 1, respectively).