Law of double negation

Japanese: 二重否定律 - にじゅうひていりつ(英語表記)law of double negation
Law of double negation
This law states that the double negation of a proposition p gives the proposition itself, and has been counted as one of the principles of logic. If the negation of the negation of p does not equal the affirmation of p , then there must be an intermediate state between the negation of p and the affirmation of p , and the law of the excluded middle, which does not acknowledge the existence of such an intermediate state, makes the same point. Therefore, along with the law of the excluded middle, it is considered to characterize the traditional system of logic. [Oide Akira]

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
ある命題pの二重否定からはその命題自体が得られるという法則のことで,論理的原理の一つに数えられてきた。〈pの否定の否定〉が〈pの肯定〉にならないとすれば,〈pの否定〉と〈pの肯定〉の間に中間状態があることになるから,そのような中間状態の存在を認めないという排中律も,同じ趣旨を述べていることになる。それゆえ,排中律とともに,伝統的な論理の体系を特徴づけるものと考えられている。【大出 晁】

出典 株式会社平凡社世界大百科事典 第2版について 情報

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