EntityQ10859910· pop 10· linked from 405 articlestheorySign in to saveset of sentences in a formal languageConnectionsconsistencyEntitystructureEntitysemantic theory of truthEntityaxiomEntitymathematical logicEntityfirst-order logicEntityPeano axiomsEntityformal systemEntityZermelo–Fraenkel set theoryEntitylogical consequenceEntityrecursive setEntitysemantics of logicEntityenumerationEntityHilbert systemEntityground expressionEntitydiagramEntitylogicEntityInternational Standard Book NumberEntityset theoryEntityfunctionEntityCategoriesFormal theoriesLogical expressions