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

Heike Mildenberger; Saharon Shelah

doi:10.2178/jsl/1318338852

Abstract

We prove the statement in the title.

Citation

Heike Mildenberger. Saharon Shelah. "The minimal cofinality of an ultrapower of ω and the cofinality of the symmetric groupcan be larger than 𝔟⁺." J. Symbolic Logic 76 (4) 1322 - 1340, December 2011. https://doi.org/10.2178/jsl/1318338852

Information

Published: December 2011

First available in Project Euclid: 11 October 2011

zbMATH: 1271.03067

MathSciNet: MR2895398

Digital Object Identifier: 10.2178/jsl/1318338852

Subjects:

Primary: 03E05 , 03E17 , 03E35

Keywords: cofinality of the symmetric group , forcing technique , minimum cofinality of an ultrapower

Abstract

Citation

Information

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