EntityQ4720484· pop 5· linked from 12 articlesAlexander dualitySign in to saveduality of the homology of the complement of a subspaceConnectionscontractible spaceEntitymathematicsEntityInternational Standard Book NumberEntitycircleEntitytopologyEntitysphereEntitydigital object identifierEntityInternational Standard Serial NumberEntityOCLC, Inc.EntityEuclidean spaceEntityalgebraic geometryEntityisomorphismEntityQ118398Entityabelian groupEntitymanifoldEntityCambridge University PressEntityPavel AleksandrovEntitycompact spaceEntityLev PontryaginEntityRiemann sphereEntityCategoriesAlgebraic topologyDuality (mathematics)