EntityQ1182249· pop 14· linked from 34 articlesdeduction theoremSign in to savetheoremConnectionspropositional calculusEntityfirst-order logicEntitySpringer Science+Business MediaEntitycombinatory logicEntitymetatheoremEntityHilbert systemEntityconditional proofEntityNew York CityCityInternational Standard Book NumberEntityJohn von NeumannEntitydigital object identifierEntitymathematical logicEntityempty setEntityLibrary of Congress Control NumberEntityHilbert spaceEntityUniversity of Notre DameEntitylambda calculusEntitytautologyEntityQ22908627EntityStephen Cole KleeneEntityCategoriesDeductive reasoningMetatheoremsProof theoryTheorems in the foundations of mathematics