The spectrum of characters of ultrafilters on ω

• Autorzy: Saharon Shelah
• Języki publikacji: EN

Abstrakty

EN

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.

Kategorie tematyczne

• 03E17: Cardinal characteristics of the continuum
• 03E05: Other combinatorial set theory

• Wydawca: Institute of Mathematics Polish Academy of Sciences
• Czasopismo: Colloquium Mathematicum
• Rocznik: 2008
• Tom: 111
• Numer: 2
• Strony: 213-220

Daty

wydano

2008

Twórcy

autor

Saharon Shelah

• The Hebrew University of Jerusalem, Einstein Institute of Mathematics, Edmond J. Safra Campus, Givat Ram, Jerusalem 91904, Israel
• Department of Mathematics, Hill Center, Busch Campus, Rutgers, The State University of New Jersey, 110 Frelinghuysen Road, Piscataway, NJ 08854-8019, U.S.A.

Identyfikatory

DOI

10.4064/cm111-2-5