Slim models of Zermelo set theory
Slim models of Zermelo set theory
复制标题
策梅洛集合论的细长模型
DOI:
10.2307/2695026
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发表时间:
2001
期刊:
影响因子:
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通讯作者:
A. R. D. Mathias
中科院分区:
文献类型:
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作者:
A. R. D. Mathias
Abstract Working in Z + KP, we give a new proof that the class of hereditarily finite sets cannot be proved to be a set in Zermelo set theory, extend the method to establish other failures of replacement, and exhibit a formula Φ(λ, a) such that for any sequence ⟨Aλ ∣ λ a limit ordinal⟩ where for each λ. Aλ ⊆ λ2, there is a supertransitive inner model of Zermelo containing all ordinals in which for every λAλ = {a ∣ Φ(λ, a)}.