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

Heike Mildenberger; Saharon Shelah

doi:10.2178/jsl/1318338852

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

Heike Mildenberger^*, Saharon Shelah

^*Corresponding author for this work

Einstein Institute of Mathematics

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

We prove the statement in the title.

Original language	English
Pages (from-to)	1322-1340
Number of pages	19
Journal	Journal of Symbolic Logic
Volume	76
Issue number	4
DOIs	https://doi.org/10.2178/jsl/1318338852
State	Published - Dec 2011

Keywords

Cofinality of the symmetric group
Forcing technique
Minimum cofinality of an ultrapower

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10.2178/jsl/1318338852

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abstract = "We prove the statement in the title.",

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

Abstract

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