EntityQ1378301· pop 15· linked from 375 articlesuniversal setSign in to savein set theory, a set which contains all objects, including itselfConnectionssemantic theory of truthEntitymathematical logicEntityErnst ZermeloEntityfirst-order logicEntityformal systemEntityconsistencyEntityuniversal quantificationEntityrecursive setEntitysemantics of logicEntityaxiom schema of specificationEntitystructureEntityground expressionEntitydiagramEntitylogicEntityBertrand RussellEntityInternational Standard Book NumberEntityset theoryEntityfunctionEntityJohn von NeumannEntitysetEntityCategoriesBasic concepts in set theoryFamilies of setsParadoxes of naive set theorySelf-referenceSystems of set theoryWellfoundedness