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Cardinality of wellordered disjoint unions of quotients of smooth equivalence relations
Annals of Pure and Applied Logic ( IF 0.6 ) Pub Date : 2021-04-29 , DOI: 10.1016/j.apal.2021.102988
William Chan , Stephen Jackson

Assume ZF+AD++V=L(P(R)). Let ≈ denote the relation of being in bijection. Let κON and Eα:α<κ be such that for all α<κ, Eα is an equivalence relation on R with all classes countable and R/EαR. Then the disjoint union α<κR/Eα is in bijection with R×κ and α<κR/Eα has the Jónsson property.

Assume ZF+AD++V=L(P(R)). A set X[ω1]<ω1 has a sequence Eα:α<ω1 of equivalence relations on R such that R/EαR and Xα<ω1R/Eα if and only if Rω1 injects into X.

Assume AD. Suppose R[ω1]ω×R is a relation such that for all f[ω1]ω, Rf={xR:R(f,x)} is nonempty and countable. Then there is an uncountable Xω1 and function Φ:[X]ωR which uniformizes R on [X]ω: that is, for all f[X]ω, R(f,Φ(f)).

Under AD, if κ is an ordinal and Eα:α<κ is a sequence of equivalence relations on R with all classes countable, then [ω1]ω does not inject into α<κR/Eα.



中文翻译:

光滑对等关系的商的有序不相交并的基数

认为 采埃孚+一种d++伏特=大号P[R。让≈表示存在双射的关系。让κËαα<κ 对所有人来说 α<κËα 是上的等价关系 [R 所有班级都是可数的 [R/Ëα[R。然后是脱节的联合α<κ[R/Ëα[R×κα<κ[R/Ëα 拥有Jónsson属性。

认为 采埃孚+一种d++伏特=大号P[R。一套X[ω1个]<ω1个 有一个序列 Ëαα<ω1个 等价关系 [R 这样 [R/Ëα[RXα<ω1个[R/Ëα 当且仅当 [Rω1个注入到X

认为 广告。认为[R[ω1个]ω×[R 是这样的关系,对于所有人 F[ω1个]ω[RF={X[R[RFX}是非空且可数的。然后有一个不可数的Xω1个 和功能 Φ[X]ω[R使R on均匀化[X]ω:也就是说,对于所有人 F[X]ω[RFΦF

在下面 广告,如果κ是序数且Ëαα<κ 是一个等价关系的序列 [R 所有班级都是可数的,那么 [ω1个]ω 不注入 α<κ[R/Ëα

更新日期:2021-05-05
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