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arXiv 2104.04589cs.LO
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经典证明与反驳的构造性逻辑(扩充版)

A Constructive Logic with Classical Proofs and Refutations (Extended Version)

Pablo Barenbaum, Teodoro Freund

摘要:

我们研究了经典命题逻辑的保守扩展,区分了四种陈述模式:一个命题可以被肯定或否定,它可以是强的或经典的。强命题的证明在某种意义上必须是构造性的,而经典命题的证明则是通过矛盾来进行的。该系统,在自然演绎风格,被证明是健全的和完整的Kripke语义。我们从命题作为类型对应的角度出发,通过导出一个具有合流约简的项分配系统来发展该系统。强规范化的证明依赖于使用Mendler风格的递归转换到系统F。

英文摘要:

We study a conservative extension of classical propositional logic distinguishing between four modes of statement: a proposition may be affirmed or denied, and it may be strong or classical. Proofs of strong propositions must be constructive in some sense, whereas proofs of classical propositions proceed by contradiction. The system, in natural deduction style, is shown to be sound and complete with respect to a Kripke semantics. We develop the system from the perspective of the propositions-as-types correspondence by deriving a term assignment system with confluent reduction. The proof of strong normalization relies on a translation to System F with Mendler-style recursion.

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