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arXiv 0801.3065cs.LO
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一类具有类属判断和归纳的逻辑的割消

Cut Elimination for a Logic with Generic Judgments and Induction

Alwen Tiu

摘要:

本文给出了逻辑$LG^ω$的割消证明,它是Miller和Tiu的逻辑$\FOLDNb$的一般判断编码证明系统的推广,并采用归纳法原理.逻辑$LG^ω$,就像$\FOLDNb$一样,以一阶直觉逻辑的扩展为特征,具有不动点和"通用量词“$\nabla$,用于推理逻辑中编码的对象系统中绑定的动态。以前尝试用归纳原则扩展$\FOLDNb$,但在归纳规范中对绑定的某些行为进行建模时没有成功。事实证明,这个问题可以通过放松对$\nabla$的一些限制来解决,特别是通过添加公理$B \equiv \nabla x. B$,其中$x$在$B$中不是自由的。我们表明,通过采用等方差原理,表示的扩展逻辑可以大大简化。本文包含\cite{tiu07entcs}中所述结果的技术证明;鼓励读者查阅\cite{tiu07entcs}以了解$LG^ω.$的动机和示例

英文摘要:

This paper presents a cut-elimination proof for the logic $LG^ω$, which is an extension of a proof system for encoding generic judgments, the logic $\FOLDNb$ of Miller and Tiu, with an induction principle. The logic $LG^ω$, just as $\FOLDNb$, features extensions of first-order intuitionistic logic with fixed points and a ``generic quantifier'', $\nabla$, which is used to reason about the dynamics of bindings in object systems encoded in the logic. A previous attempt to extend $\FOLDNb$ with an induction principle has been unsuccessful in modeling some behaviours of bindings in inductive specifications. It turns out that this problem can be solved by relaxing some restrictions on $\nabla$, in particular by adding the axiom $B \equiv \nabla x. B$, where $x$ is not free in $B$. We show that by adopting the equivariance principle, the presentation of the extended logic can be much simplified. This paper contains the technical proofs for the results stated in \cite{tiu07entcs}; readers are encouraged to consult \cite{tiu07entcs} for motivations and examples for $LG^ω.$

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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