EntityQ331481· pop 27· linked from 160 articlescoverSign in to savefamily of subsets of a set whose union equals the whole setConnectionsmathematicsEntityInternational Standard Book NumberEntityset theoryEntitytopologyEntitysetEntityOCLC, Inc.EntitysubsetEntityintervalEntitytopological spaceEntityfinite setEntitycountable setEntityopen setEntitytransitive relationEntityneighborhoodEntitypartition of a setEntitycompact spaceEntityreflexive relationEntitysimplexEntityEncyclopedia of MathematicsEntityindexed familyEntityCategoriesFamilies of setsGeneral topologyTopology