contradictory formula

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• Gödel–Gentzen negative translation — In proof theory, the Gödel–Gentzen negative translation is a method for embedding classical first order logic into intuitionistic first order logic. It is one of a number of double negation translations that are of importance to the metatheory of …   Wikipedia

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• Contradiction — In classical logic, a contradiction consists of a logical incompatibility between two or more propositions. It occurs when the propositions, taken together, yield two conclusions which form the logical, usually opposite inversions of each other.… …   Wikipedia

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