1. Natural deductionIn logic and proof theory, natural deduction is a kind of proof calculus in which logical reasoning is expressed by inference rules closely related to the "natural" way of reasoning. This contrasts with the axiomatic systems which instead use axioms as much as possible to express the logical laws of deductive reasoning.
Read “Natural deduction” on English Wikipedia
Read “自然演繹” on Japanese Wikipedia
Read “Natural deduction” on DBpedia
Read “Natural deduction” on English Wikipedia
Read “自然演繹” on Japanese Wikipedia
Read “Natural deduction” on DBpedia
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