Place: Fields Institute (Room 210)
Date: November 11, 2016 (14:00-15:00)
Title: A rough classification of non $\sigma$-scattered linear orders
Abstract: We prove that under $PFA^+$ every non $\sigma$-scattered linear order contains a real type, an Aronszajn type, or a ladder system indexed by a stationary subset of $\omega_1$ equipped with a lexicographic order or reverse lexicographic order. This is a joint work with Justin Moore.