EntityQ1781358· pop 12· linked from 49 articleswedge sumSign in to save"one-point union" of a family of topological spacesConnectionspointed spaceEntityroseEntityInternational Standard Book NumberEntitytopologyEntitycommutative propertyEntityassociativityEntitytopological spaceEntityhomeomorphismEntityhomotopyEntityfundamental groupEntityclosureEntityindexed familyEntityexterior algebraEntityCW complexEntitycoproductEntityhomotopy groupEntityhomogeneous spaceEntitySeifert–van Kampen theoremEntityquotient topological spaceEntityfree productEntityCategoriesHomotopy theoryOperations on structuresTopology