De Morgan's laws

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Related to De Morgan's law: Boolean algebra, De Morgan's theorem

De Morgan's laws

pl n
(Logic) (in formal logic and set theory) the principles that conjunction and disjunction, or union and intersection, are dual. Thus the negation of P & Q is equivalent to not-P or not-Q
[named after Augustus De Morgan (1806–71), British mathematician]
References in periodicals archive ?
For example, De Morgan's laws of equivalence as well as the rules of simplification, addition, and contraposition were well known to Ockham, Burley, Buridan, and Paul of Venice, who also formulated useful strategies for coping with problems of existential import, the putative Achilles' heel of "traditional" logic.