The spectrum of characters of ultrafilters on ω

Saharon Shelah*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We show the consistency of the statement: “the set of regular cardinals which are the characters of ultrafilters on ω is not convex”. We also deal with the set of π-characters of ultrafilters on ω.

Original languageEnglish
Pages (from-to)213-220
Number of pages8
JournalColloquium Mathematicum
Volume111
Issue number2
DOIs
StatePublished - 2008

Bibliographical note

Publisher Copyright:
© Instytut Matematyczny PAN, 2008.

Keywords

  • Characters
  • Forcing
  • Set theory
  • Ultrafilter

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