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An unpublished theorem of Solovay on OD partitions of reals into two non-OD parts, revisited
Journal of Mathematical Logic ( IF 0.9 ) Pub Date : 2020-12-26 , DOI: 10.1142/s0219061321500148
Ali Enayat 1 , Vladimir Kanovei 2
Affiliation  

A definable pair of disjoint non-OD sets of reals (hence, indiscernible sets) exists in the Sacks and 𝔼0-large generic extensions of the constructible universe L. More specifically, if a2ω is either Sacks generic or 𝔼0-large generic real over L, then it is true in L[a] that there is a lightface Π21 equivalence relation Q on the Π21 set U=2ω \L with exactly two equivalence classes, and both those classes are non-OD sets.

中文翻译:

Solovay 未发表的关于实数 OD 划分为两个非 OD 部分的定理,重新审视

可定义的一对不相交的非 OD 实数集(因此,不可识别集)存在于 Sacks 和 𝔼 0 - 可构造宇宙的大型泛型扩展大号. 更具体地说,如果一种2ω是 Sacks 通用或 𝔼 0 -large generic real over大号, 那么它在大号[一种] 有一个光面Π21等价关系Π21ü=2ω \大号恰好有两个等价类,并且这两个类都是非 OD 集。
更新日期:2020-12-26
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