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The cofinality of the symmetric group and the cofinality of ultrapowers

Authors :
Heike Mildenberger
Saharon Shelah
Source :
Israel Journal of Mathematics. 242:97-128
Publication Year :
2021
Publisher :
Springer Science and Business Media LLC, 2021.

Abstract

We prove that $$\mathfrak{mcf}$$ and $$\mathfrak{mcf}$$ are both consistent relative to ZFC. This answers a question by Banakh, Repovs and Zdomskyy and a question from [MS11].

Details

ISSN :
15658511 and 00212172
Volume :
242
Database :
OpenAIRE
Journal :
Israel Journal of Mathematics
Accession number :
edsair.doi...........80c0cdbf46351ea09aa44fb921e9ac98
Full Text :
https://doi.org/10.1007/s11856-021-2124-2