Critical Cardinals

Hayut, Yair and Karagila, Asaf ORCID: (2020) Critical Cardinals. Israel Journal of Mathematics, 236 (1). 449–472. ISSN 0021-2172

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We introduce the notion of a critical cardinal as the critical point of sufficiently strong elementary embedding between transitive sets. Assuming the axiom of choice this is equivalent to measurability, but it is well-known that choice is necessary for the equivalence. Oddly enough, this central notion was never investigated on its own before. We prove a technical criterion for lifting elementary embeddings to symmetric extensions, and we use this to show that it is consistent relative to a supercompact cardinal that there is a critical cardinal whose successor is singular.

Item Type: Article
Faculty \ School: Faculty of Science > School of Mathematics
UEA Research Groups: Faculty of Science > Research Groups > Logic
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Depositing User: LivePure Connector
Date Deposited: 30 May 2019 14:30
Last Modified: 22 Oct 2022 04:47
DOI: 10.1007/s11856-020-1998-8


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