EntityQ2669907· pop 7· linked from 14 articlesWhitehead manifoldSign in to saveopen 3-manifold that is contractible, but not homeomorphic to R³ConnectionsmanifoldEntityvector bundle connectionEntitymathematicsEntityInternational Standard Book NumberEntitycircleEntitydigital object identifierEntitydoughnutEntitytorusEntitydiskEntitybibcodeEntitytensorEntityvector fieldEntityhomeomorphismEntityballEntityPoincaré conjectureEntitygeodesic curveEntityLie groupEntityNoether's theoremEntityhomotopyEntitycounterexampleEntityCategories3-manifoldsDifferential geometryGeometric topologyManifolds