4-manifold
manifold of dimension four
asymptotically locally Euclidean space
noncompact hyperkähler 4-manifold asymptotically isometric to a quotient of Euclidean 4-space by a binary polyhedral group
Barlow surface
mathematical construct
Mazur manifold
4-dimensional contractible smooth manifold with boundary that is not diffeomorphic to the 4-ball
Mazur manifold
4-dimensional contractible smooth manifold with boundary that is not diffeomorphic to the 4-ball