Home › Events › Topology-Analysis-Geometry Seminar - Jian Ge, University of Notre Dame Topology-Analysis-Geometry Seminar - Jian Ge, University of Notre Dame Time: Tue Apr 5, 2011, 9:30 am - 11:00 am Location: 258 Hurley Hall Title: A proof of Yamaguchi's collapsing theorem for 4-manifolds