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单词 Double negation
释义

Double negation

原声例句
VOA慢速英语_教育

This produces a kind of double negation - I cannot find nobody.

这就产生了一种双重否定——I cannot find nobody。

英语百科

Double negation

In propositional logic, double negation is the theorem that states that "If a statement is true, then it is not the case that the statement is not true." This is expressed by saying that a proposition A is logically equivalent to not (not-A), or by the formula A ≡ ~(~A) where the sign ≡ expresses logical equivalence and the sign ~ expresses negation.

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