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)