Example image of eyePlorer eyePlorer map for 'E8 manifold': 4-manifold Compact space E8 lattice Intersection form (4-manifold) Mathematics Simply connected space Michael Freedman Andrew Casson Casson invariant Differential structure Donaldson's theorem Rokhlin's theorem Simplicial complex Triangulation (topology) Coxeter–Dynkin diagram Euler characteristic Sphere Homology sphere Fake 4-ball Hauptvermutung Categories of manifolds E8 E8 (mathematics)