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arXiv:math/0612240 [math.LO]AbstractReferencesReviewsResources

The spectrum of characters of ultrafilters on omega

Saharon Shelah

Published 2006-12-09, updated 2007-08-15Version 2

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.

Categories: math.LO, math.GN
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