EntityQ191853· pop 11· linked from 163 articlesZermelo set theorySign in to savesystem of set theory (in mathematics)ConnectionsRussell's paradoxEntityordinal numberEntityuncountable setEntityPrincipia MatheEntityclassEntityaxiom schema of replacementEntityaxiom schema of specificationEntityBertrand RussellEntityInternational Standard Book NumberEntitynatural numberEntityset theoryEntityJohn von NeumannEntitysetEntityaxiomEntityGeorg CantorEntityKurt GödelEntitydigital object identifierEntityempty setEntityRichard DedekindEntitysubsetEntityCategoriesSystems of set theory