The spectrum of characters of ultrafilters on ω

Saharon Shelah

doi:10.4064/cm111-2-5

The spectrum of characters of ultrafilters on ω

Saharon Shelah^*

^*Corresponding author for this work

Einstein Institute of Mathematics

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	213-220
Number of pages	8
Journal	Colloquium Mathematicum
Volume	111
Issue number	2
DOIs	https://doi.org/10.4064/cm111-2-5
State	Published - 2008

Bibliographical note

Publisher Copyright:
© Instytut Matematyczny PAN, 2008.

Keywords

Characters
Forcing
Set theory
Ultrafilter

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10.4064/cm111-2-5

Cite this

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KW - Forcing

KW - Set theory

KW - Ultrafilter

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The spectrum of characters of ultrafilters on ω

Abstract

Bibliographical note

Keywords

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