The least weakly compact cardinal can be unfoldable, weakly measurable and nearly θ-supercompact

Brent Cody*, Moti Gitik, Joel David Hamkins, Jason A. Schanker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We prove from suitable large cardinal hypotheses that the least weakly compact cardinal can be unfoldable, weakly measurable and even nearly θ-supercompact, for any desired θ. In addition, we prove several global results showing how the entire class of weakly compactcardinals, a proper class, can be made to coincide with the class of unfoldable cardinals, with the class of weakly measurable cardinals or with the class of nearly θκ-supercompact cardinals κ, for nearly any desired function κ↦θκ. These results answer several questions that had been open in the literature and extend to these large cardinals the identity-crises phenomenon, first identified by Magidor with the strongly compact cardinals.

Original languageEnglish
Pages (from-to)491-510
Number of pages20
JournalArchive for Mathematical Logic
Volume54
Issue number5-6
DOIs
StatePublished - 27 Aug 2015

Keywords

  • Identity crisis
  • Nearly supercompact
  • Unfoldable
  • Weakly compact
  • Weakly measurable

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