Seminar Event Detail

Logic

Date:  Thursday, November 04, 2021 Location:  2866 East Hall (4:00 PM to 5:30 PM) Title:  Tukey ordering and forcing preservation of ultrafilters Abstract:   Abstract: This will be a continuation of last week's talk in which I discussed the Tukey ordering of ultrafilters. This week, I'll talk about a species of ultrafilters defined in terms of preservation by forcing. This species, like last week's, also admits a combinatorial definition. The two combinatorial definitions have a very similar "flavor". I'll speculate about prospects for combining the two sorts of combinatorial definitions. Files: Speaker:  Andreas Blass Institution:  UM Event Organizer:   Andreas R Blass    ablass@umich.edu

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