The spectrum of characters of ultrafilters on omega

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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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Logic, General Topology

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http://salesiana.dossiersoluciones.com/handle/123456789/136082

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/0612240
 http://arxiv.org/abs/math/0612240
 Colloq. Math. 111 No. 2 (2008) 213--220

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arXiv