4-manifold topology and collision rank of groups
October 30, 2026 @ 3:00 pm - 4:30 pm
Freedman Seminar
Speaker: Michael Freedman, Harvard CMSA
Title: The geometry of the Bing Involution
Abstract: I’ll discuss a new sharper proof, joint with Mike Starbird that precisely quantifies the stretching necessary for Bing’s wild involution on S^3.