Time:  12:00  13:20 
Room: 
Wean Hall 7201

Speaker: 
Chris LambieHanson Department of Mathematical Sciences Carnegie Mellon University 
Title: 
Jonsson cardinals, partition relations and stationary reflection II

Abstract: 
Abstract: I will present a proof that, relative to large cardinal assumptions, it is consistent that there is a singular cardinal mu such that every stationary subset of mu^+ reflects but that there is a stationary subset of mu^+ that does not reflect at ordinals of arbitrarily high cofinality. This answers a question of Eisworth motivated by the study of Jónsson cardinals and squarebracket partition relations and is joint work with James Cummings. 