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13823 | In natural deduction, inferences are atomic steps involving just one logical constant [Prawitz] |
Full Idea: In Gentzen's natural deduction, the inferences are broken down into atomic steps in such a way that each step involves only one logical constant. The steps are the introduction or elimination of the logical constants. | |
From: Dag Prawitz (Gentzen's Analysis of First-Order Proofs [1974], 1.1) |