EntityQ1147242· pop 33· linked from 212 articlessymmetric differenceSign in to savemathematical definition in set theoryConnectionsmetric spaceEntitycomplementEntityidentity elementEntityelementary abelian groupEntitymathematicsEntityBertrand RussellEntityInternational Standard Book NumberEntityset theoryEntityJohn von NeumannEntitysetEntityaxiomEntityGeorg CantorEntityKurt GödelEntitysymmetryEntityvector spaceEntitygraph theoryEntityRichard DedekindEntityempty setEntitycommutative propertyEntityringEntityCategoriesBasic concepts in set theoryOperations on setsSubtraction