The spectrum of characters of ultrafilters on omega

Details The spectrum of characters of ultrafilters on omega The spectrum of characters of ultrafilters on omega

2006-12-09

arxiv.org/abs/math/0612240v2

Mathematics

Logic

Scientific paper

We show the consistency of the set of regular cardinals which are the
character of some ultrafilter on omega is not convex. We also deal with the set
of pi chi-characters of ultrafilters on omega.

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