EntityQ5282265· pop 6· linked from 54 articlesdisjunction eliminationSign in to saveRule of inference of propositional logicConnectionspropositional calculusEntitylogical disjunctionEntityEnglish languageConceptcommutative propertyEntityassociativityEntityinferenceEntitydistributive propertyEntityDe Morgan's lawsEntitytautologyEntityfirst-order logicEntityformal systemEntitymodus ponensEntitylogical consequenceEntityvalidityEntitymodus tollensEntitycontrapositionEntityrule of inferenceEntitymetalogicEntitydisjunctive normal formEntityhypothetical syllogismEntityCategoriesRules of inferenceTheorems in propositional logic