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arXiv 1802.10261math.LO
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可证逻辑谓词扩展的无割证明系统

A cut-free proof system for a predicate extension of the logic of provability

Yoshihito Tanaka

摘要:

本文介绍了一个证明系统$\mathsf{NQGL}$,它是由$\mathbf{K}$和Löb公式$\Box(\Box p\supset p)\supset\Box p$定义的逻辑$\mathbf{GL}$的Kripke完全谓词扩展,即可证性逻辑. $\mathsf{NQGL}$是Gentzen微积分$\mathsf{LK}$的模态扩展。虽然$\mathsf{NQGL}$的命题片段公理化了$\mathbf{GL}$,但它没有Löb公式作为它的公理。相反,它有一个非紧规则,即一个具有可数个前提的推导规则。我们证明了$\mathsf{NQGL}$具有割容许性,并且对于Kripke框架类是完备的,使得对于每个世界,从世界出发的路径长度的上确界是有限的。

英文摘要:

In this paper, we introduce a proof system $\mathsf{NQGL}$ for a Kripke complete predicate extension of the logic $\mathbf{GL}$, that is, the logic of provability, which is defned by $\mathbf{K}$ and the Löb formula $\Box(\Box p\supset p)\supset\Box p$. $\mathsf{NQGL}$ is a modal extension of Gentzen's sequent calculus $\mathsf{LK}$. Although the propositional fragment of $\mathsf{NQGL}$ axiomatizes $\mathbf{GL}$, it does not have the Löb formula as its axiom. Instead, it has a non-compact rule, that is, a derivation rule with countably many premises. We show that $\mathsf{NQGL}$ enjoys cut admissibility and is complete with respect to the class of Kripke frames such that for each world, the supremum of the length of the paths from the world is finite.

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