EntityQ9289849· pop 9· linked from 57 articlesconjunction eliminationSign in to saveinference in propositional logicConnectionsEnglish languageConceptlogicEntitytheoremEntitycommutative propertyEntityassociativityEntityinferenceEntitypropositional calculusEntitydistributive propertyEntityformal languageEntityDe Morgan's lawsEntitylogical conjunctionEntitytautologyEntityfirst-order logicEntityformal systemEntitymodus ponensEntitylogical consequenceEntityvalidityEntitymodus tollensEntitycontrapositionEntityrule of inferenceEntityCategoriesRules of inferenceTheorems in propositional logic