单词	De Morgan's theorem
释义	De Morgan's theorem noun De Mor·​gan's theorem də̇ˈmȯrgənz-, dēˈ- : 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 Word History Etymology after Augustus De Morgan †1871 English mathematician
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