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 |
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Pages (from-to) | 213-220 |
Number of pages | 8 |
Journal | Colloquium Mathematicum |
Volume | 111 |
Issue number | 2 |
DOIs | |
State | Published - 2008 |
Bibliographical note
Publisher Copyright:© Instytut Matematyczny PAN, 2008.
Keywords
- Characters
- Forcing
- Set theory
- Ultrafilter