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Chain conditions, layered partial orders and weak compactness

Presented by: 
PM Lücke Universität Bonn
Date: 
Thursday 27th August 2015 - 14:00 to 14:30
Venue: 
INI Seminar Room 1
Abstract: 
Motivated by a conjecture of Todorcevic, we study strengthenings of the $\kappa-chain$ conditions that are equivalent to the $\kappa-chain$ condition in the case where $\kappa$ is a weakly compact cardinal. We then use such properties to provide new characterizations of weakly compact cardinals. In addition, we show that the question whether weak compactness is characterized by the statement that all $\kappa-Knaster$ posets satisfy these properties is independent from the axioms of ZFC. This is joint work with Sean D. Cox (VCU Richmond).
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University of Cambridge Research Councils UK
    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons