James Cummings: More on compactness

Mathematical logic seminar – Feb 5 2019
Time:     3:30pm – 4:30 pm

Room:     Wean Hall 8220

Speaker:         James Cummings
Department of Mathematical Sciences
CMU

Title:     More on compactness

Abstract:

I’ll discuss compactness phenomena at regular cardinals, particularly successors of singular cardinals. In particular I’ll explain why ℵω+1 is in some respects completely different from ℵω2+1.

(This talk is related to the talks about compactness that I gave in the Fall semester, but is logically independent)

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