Andreas Blass: The next best thing to a P-point

21/Sep/2012, 13:30–15:00
Fields institute,Room 210

Speaker: Andreas Blass

Title: The next best thing to a P-point

Abstract: I’ll present a couple of examples of ultrafilters that are not P-points but have the strongest weak (i.e., square-bracket, exponent 2) partition property that is possible for non-P-points.  The two examples differ in other respects, one of which shows a curious aspect of forcing.  I plan to also summarize preliminary definitions and results, to place these examples in context.

 

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