De Morgan's theorem

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

Definition of De Morgan's theorem

  1. :  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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Origin and Etymology of de morgan's theorem

after Augustus De Morgan †1871 English mathematician

Seen and Heard

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to criticize severely

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