law of double negation

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English[edit]

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Noun[edit]

law of double negation ‎(uncountable)

  1. (logic) The statement that the negation of the negation of A implies A, for any proposition A. Stated symbolically: .
    • The law of double negation is not valid intuitionistically. To show this with Heyting algebra semantics, let . Then , ,  .