Sh:1021
- Mildenberger, H., & Shelah, S. The cofinality of the symmetric group and the cofinality of ultrapowers. Preprint.
-
Abstract:
We prove that {\mathfrak{{mcf}}} < {\rm cf} ({\rm{Sym}(\omega)}) and {\mathfrak{{mcf}}} > {\rm cf}({\rm{Sym}(\omega)})= {\mathfrak{{b}}} are both consistent relative to ZFC. This answers a question from [BanakhRepovsZdomskyy] and from [MdSh:967]. - Version 2019-02-21_11 (25p)
Bib entry
@article{Sh:1021, author = {Mildenberger, Heike and Shelah, Saharon}, title = {{The cofinality of the symmetric group and the cofinality of ultrapowers}} }