围绕第一和第二不可数基数的更多可定义组合

IF 0.9 1区 数学 Q1 LOGIC Journal of Mathematical Logic Pub Date : 2023-01-01 DOI:10.1142/S0219061322500295
William Chan, Stephen Jackson, Nam Trang
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引用次数: 5

摘要

假设ZF +广告。对于P(ω1)和P(ω2)的某些子集上的函数,将给出以下两个连续性结果:对于每一个< ω1和函数Φ: [ω1]→ω1,存在一个俱乐部C≤ω1和a ζ,使得对于所有f, g∈[C]∗,如果f ζ = g ζ, sup(f) = sup(g),则Φ(f) = Φ(g)。对于每一个< ω2和函数Φ: [ω2]→ω2,存在一个ω-俱乐部C≤ω2和a ζ,使得对于所有f, g∈[C]∗,若f ζ = g ζ, sup(f) = sup(g),则Φ(f) = Φ(g)。前两个连续性结果将用于区分P(ω2)以下的基数:|[ω1] | < |[ω1]1 |。|[ω2] | < |ω2]1 | < |[ω2]1 | < |[ω2]2 |。¬(|[ω1]1 |≤[ω2] |)。¬(|[ω1]1 |≤([ω2]1 |)。[ω1]具有Jónsson性质:即对于每一个Φ:([ω1])→[ω1],存在一个|X| = |[ω1] |的X≠ω1,使得Φ[ω1]
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More definable combinatorics around the first and second uncountable cardinals
Assume ZF+AD. The following two continuity results for functions on certain subsets of P(ω1) and P(ω2) will be shown: For every < ω1 and function Φ : [ω1] → ω1, there is a club C ⊆ ω1 and a ζ < so that for all f, g ∈ [C] ∗, if f ζ = g ζ and sup(f) = sup(g), then Φ(f) = Φ(g). For every < ω2 and function Φ : [ω2] → ω2, there is an ω-club C ⊆ ω2 and a ζ < so that for all f, g ∈ [C] ∗, if f ζ = g ζ and sup(f) = sup(g), then Φ(f) = Φ(g). The previous two continuity results will be used to distinguish cardinals below P(ω2): |[ω1] | < |[ω1]1 |. |[ω2] | < |ω2]1 | < |[ω2]1 | < |[ω2]2 |. ¬(|[ω1]1 | ≤ [ω2] |). ¬(|[ω1]1 | ≤ ([ω2]1 |). [ω1] has the Jónsson property: That is, for every Φ : ([ω1]) → [ω1] , there is an X ⊆ [ω1] with |X| = |[ω1] | so that Φ[
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来源期刊
Journal of Mathematical Logic
Journal of Mathematical Logic MATHEMATICS-LOGIC
CiteScore
1.60
自引率
11.10%
发文量
23
审稿时长
>12 weeks
期刊介绍: The Journal of Mathematical Logic (JML) provides an important forum for the communication of original contributions in all areas of mathematical logic and its applications. It aims at publishing papers at the highest level of mathematical creativity and sophistication. JML intends to represent the most important and innovative developments in the subject.
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