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A reduction rule is introduced by $ x^ alpha \to \beta left(P^((alpha \to \beta)\to alpha) \to alpha y ^ (alpha \to \beta) \to alpha \right) stackrel{P}{\to} x(yx) $ as a transformation of proof figur...es in implicational classical logic. The proof figure are represented as typed $ lamda-terms $ with a new constant $ P^ left(( alpha \to \beta) \to alpha) \to alpha $. It is shown that all the terms with the same type are equivalent with respect to the $ \beta-reduction $ and this reduction. Hence all the proof of the same implicational formula are equivalent.続きを見る
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