De Morgan's theorem

noun
De Mor·gan's theorem | \də̇ˈmȯrgənz-, dēˈ-\

Definition of De Morgan's theorem 

: one of a pair of theorems in logic: the denial of a conjunction is equivalent to the alternation of the denials and the denial of an alternation is equivalent to the conjunction of the denials

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History and Etymology for De Morgan's theorem

after Augustus De Morgan †1871 English mathematician

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