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The first omitting cardinal for Magidority
Authors:Shimon Garti  Yair Hayut
Abstract:An infinite cardinal λ is Magidor if and only if urn:x-wiley:09425616:media:malq201800026:malq201800026-math-0001. It is known that if λ is Magidor then urn:x-wiley:09425616:media:malq201800026:malq201800026-math-0002 for some urn:x-wiley:09425616:media:malq201800026:malq201800026-math-0003, and the first such α is denoted by urn:x-wiley:09425616:media:malq201800026:malq201800026-math-0004. In this paper we try to understand some of the properties of urn:x-wiley:09425616:media:malq201800026:malq201800026-math-0005. We prove that urn:x-wiley:09425616:media:malq201800026:malq201800026-math-0006 can be the successor of a supercompact cardinal, when λ is a Magidor cardinal. From this result we obtain the consistency of urn:x-wiley:09425616:media:malq201800026:malq201800026-math-0007 being a successor of a singular cardinal with uncountable cofinality.
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