The minimal cofinality of an ultrapower of ω and the cofinality of the symmetric group can be larger than b+

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Journal of Symbolic Logic 76 (4):1322-1340 (2011)
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Abstract

We prove the statement in the title

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10.2178/jsl/1318338852

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References found in this work

Set Theory.Thomas Jech - 1999 - Studia Logica 63 (2):300-300.
Groupwise density and the cofinality of the infinite symmetric group.Simon Thomas - 1998 - Archive for Mathematical Logic 37 (7):483-493.
Cofinalities of countable ultraproducts: the existence theorem.R. Michael Canjar - 1989 - Notre Dame Journal of Formal Logic 30 (4):539-542.

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