6,356 research outputs found

    A hierarchy of Ramsey-like cardinals

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    We introduce a hierarchy of large cardinals between weakly compact and measurable cardinals, that is closely related to the Ramsey-like cardinals introduced by Victoria Gitman, and is based on certain infinite filter games, however also has a range of equivalent characterizations in terms of elementary embeddings. The aim of this paper is to locate the Ramsey-like cardinals studied by Gitman, and other well-known large cardinal notions, in this hierarchy

    Combinatorial Properties and Dependent choice in symmetric extensions based on L\'{e}vy Collapse

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    We work with symmetric extensions based on L\'{e}vy Collapse and extend a few results of Arthur Apter. We prove a conjecture of Ioanna Dimitriou from her P.h.d. thesis. We also observe that if VV is a model of ZFC, then DC<κDC_{<\kappa} can be preserved in the symmetric extension of VV in terms of symmetric system ⟨P,G,F⟩\langle \mathbb{P},\mathcal{G},\mathcal{F}\rangle, if P\mathbb{P} is κ\kappa-distributive and F\mathcal{F} is κ\kappa-complete. Further we observe that if VV is a model of ZF + DCκDC_{\kappa}, then DC<κDC_{<\kappa} can be preserved in the symmetric extension of VV in terms of symmetric system ⟨P,G,F⟩\langle \mathbb{P},\mathcal{G},\mathcal{F}\rangle, if P\mathbb{P} is κ\kappa-strategically closed and F\mathcal{F} is κ\kappa-complete.Comment: Revised versio
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