EntityQ912058· pop 28· linked from 339 articlessimply connected spaceSign in to savetopological space which has no holes through itConnectionshomotopyEntityconnected spaceEntityInternational Standard Book NumberEntitycomplex numberEntitytopologyEntitysphereEntitycylinderEntityOCLC, Inc.EntitytorusEntitycomplex analysisEntityMöbius stripEntityEuclidean spaceEntityHilbert spaceEntityunit circleEntitytopological spaceEntitymanifoldEntityidentity elementEntityconvex setEntityPoincaré conjectureEntityholomorphic functionEntityCategoriesAlgebraic topologyProperties of topological spaces