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Graduate Seminar

Jing Zhang
Carnegie Mellon University
Title: Special ultrafilters

Abstract: In this talk we will look at some special ultrafilters on the natural numbers. Most of whose "absolute" existence might disappoint (not provable in ZFC). Nonetheless, the existence of them is consistent with the usual system of mathematics just like continuum hypothesis. We will try to connect them with various Ramsey-theoretic properties as well as classify some of them. It would be light and fun.

Date: Tuesday, October 18, 2016
Time: 5:30 pm
Location: Wean Hall 8220
Submitted by:  Yangxi Ou