EntityQ5961806· pop 8· linked from 26 articlesroseSign in to savetopological space obtained by gluing together a collection of circles along a single pointConnectionscovering spaceEntitymathematicsEntityInternational Standard Book NumberEntitysphereEntitytorusEntitytopological spaceEntityalgebraic topologyEntityhomeomorphismEntityballEntitysubgroupEntityhomotopyEntityfundamental groupEntityspanning treeEntitygenusEntityn-sphereEntityCayley graphEntityfree groupEntitygenerating set of a groupEntitypresentation of a groupEntityCW complexEntityCategoriesAlgebraic topologyTopological spaces