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arXiv 1606.06387cs.LO
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关于经典自然演绎中强正规化的一个注记

A note on strong normalization in classical natural deduction

José Espírito Santo

摘要:

在命题经典逻辑的自然演绎的背景下,利用归谬推理规则所赋予的经典性,从否定和合取的角度考察了析取的德摩根翻译。一旦转换扩展到证明,它获得了一个减少的可证明性证明的析取自由子系统。很自然地,我们会问,是否也能对强正规化得到约化;也就是说,无析取系统的强正规化是否意味着完整系统的相同性质,以及这种性质的提升是否可以沿着德摩根平移来完成。虽然这些问题是自然的,但却被文献所忽视。我们拼出地图的减少步骤引起的德摩根翻译的证明。但是我们需要“优化”这样一个映射,以表明来自证明的完整系统中的归约序列以长度保持的方式确定来自证明的德摩根翻译的无析取系统中的归约序列。从这个意义上说,上述问题都有了肯定的答案。

英文摘要:

In the context of natural deduction for propositional classical logic, with classicality given by the inference rule reductio ad absurdum, we investigate the De Morgan translation of disjunction in terms of negation and conjunction. Once the translation is extended to proofs, it obtains a reduction of provability to provability in the disjunction-free subsystem. It is natural to ask whether a reduction is also obtained for, say, strong normalization; that is, whether strong normalization for the disjunction-free system implies the same property for the full system, and whether such lifting of the property can be done along the De Morgan translation. Although natural, these questions are neglected by the literature. We spell out the map of reduction steps induced by the De Morgan translation of proofs. But we need to "optimize" such a map in order to show that a reduction sequence in the full system from a proof determines, in a length-preserving way, a reduction sequence in the disjunction-free system from the De Morgan translation of the proof. In this sense, the above questions have a positive answer.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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