On the Spectrum of Characters of Ultrafilters

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Notre Dame Journal of Formal Logic 59 (3):371-379 (2018)
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Abstract

We show that the character spectrum Spχ(λ) (for a singular cardinal λ of countable cofinality) may include any prescribed set of regular cardinals between λ and 2λ.

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10.1215/00294527-2018-0006

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A strong polarized relation.Shimon Garti & Saharon Shelah - 2012 - Journal of Symbolic Logic 77 (3):766-776.

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