2007 seminar talk: There may be infinitely many near-coherence classes under u<d
Talk held by Heike Mildenberger (KGRC) at the KGRC seminar on 2007-04-19.
Abstract
We show that in the models of u<d from Blass and Shelah there are infinitely many near-coherence classes of ultrafilters, thus answering a question by Banakh and Blass in the negative.