Freedman Seminar

Speaker: Robert Gompf, UT Austin

Title: Exotic R^4’s are unclassifiable

Abstract: We will use descriptive set theory to show that there is a precise sense in which exotic R^4’s are unclassifiable. For other open manifolds, we can reach a much higher level of unclassifiability. This is work in progress with Aristotelis Panagiotopoulos.