EntityQ4669873· pop 5· linked from 18 articlesabsolutenessSign in to savein mathematical logic, property of formula that has the same truth value in each of some class of structuresConnectionsZermelo–Fraenkel set theoryEntitylarge cardinalEntityelementary equivalenceEntityInternational Standard Book NumberEntitynatural numberEntityset theoryEntityfunctionEntityreal numberEntityKurt GödelEntitymathematical logicEntityempty setEntityRiemann hypothesisEntitybijectionEntitycardinal numberEntityfinite setEntityaxiom of choiceEntitycountable setEntityordinal numberEntityP versus NP problemEntityfirst-order logicEntityCategoriesConcepts in logicMathematical logic