Example image of eyePlorer eyePlorer map for 'Andrew Casson': Geometric topology Mathematician Royal Society United States Yale University C. T. C. Wall University of Liverpool University of California, Berkeley University of Texas at Austin American Mathematical Society Oswald Veblen Prize in Geometry Casson handle Casson invariant Hauptvermutung Manifold Michael Freedman Poincaré conjecture Danny Calegari E8 manifold Cameron Gordon (mathematician) Dehn twist Greg Kuperberg Low-dimensional topology Casson (disambiguation) Mapping class group Heegaard splitting