Monday, April 9, 2012, from 4 to 5:30pm
East Hall, room 2866
Speaker: Andreas Blass (University of Michigan)
Title: Ultrafilters and Partition Relations
I’ll finish the proof of the partition theorem for selective-indexed sums of non-isomorphic selective ultrafilters. Then I’ll describe a forcing that produces ultrafilters that have the same partition properties but are not sums and not P-points.