Speaker: Philip Welch

Title: "The Inner Model Hypothesis"


Abstract: There has been a lot of interest in recent years
concerning absoluteness results between models of set theory. This
hypothesis (formulated by Sy Friedman) concerns a form of
absoluteness between class models of set theory, linked with the
study of inner model theory. A simple, roughly stated, version
states that whatever can be true  in an inner model of an
extension of our universe, is already true in an inner model. This
is joint work with  Sy Friedman and W. Hugh Woodin.