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arXiv 0812.2390cs.LOmath.LO
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平坦模态不动点逻辑的完备性

Completeness for Flat Modal Fixpoint Logics

Luigi Santocanale, Yde Venema

摘要:

本文给出了一类模态不动点逻辑完备性的一般统一证明方法。给定形式为γ(x,p1,. . ., pn),其中x只在γ中出现,语言L \sharp(Γ)是通过对每个γε在多模态逻辑语言中增加一个连接词\sharp \_γ而得到的.术语\sharp \_γ(\varphi 1,. . ., \varphin)的最小不动点应解释为项γ(x,φ1,. . .,φn)。本文考虑如下问题:给定Γ,构造一个公理系统,它对于语言L \sharp(Γ)在Kripke框架上的具体解释是可靠的和完备的.我们证明了两个结果,解决这个问题。首先,令K \sharp(Γ)是通过为每个不动点连接符\sharp \_γ添加Kozen-Park型不动点公理和最小不动点规则而从基本多峰K获得的逻辑。只要每个标引公式γ满足在x中不捆绑的句法准则,我们证明了这个公理系统是完备的.其次,在一般情况下,证明了K_ \sharp(Γ)的扩张K ~+(Γ)的可靠性和完备性.这种扩展是通过一个有效的过程获得的,给定索引公式γ作为输入,返回\sharp \_γ的公理和推导规则的有限集合,其大小由γ的长度限制。因此,公理系统K+(Γ)是有限的,只要Γ是有限的。

英文摘要:

This paper exhibits a general and uniform method to prove completeness for certain modal fixpoint logics. Given a set Γof modal formulas of the form γ(x, p1, . . ., pn), where x occurs only positively in γ, the language L\sharp (Γ) is obtained by adding to the language of polymodal logic a connective \sharp\_γfor each γε. The term \sharp\_γ(\varphi1, . . ., \varphin) is meant to be interpreted as the least fixed point of the functional interpretation of the term γ(x, φ1, . . ., φn). We consider the following problem: given Γ, construct an axiom system which is sound and complete with respect to the concrete interpretation of the language L\sharp (Γ) on Kripke frames. We prove two results that solve this problem. First, let K\sharp (Γ) be the logic obtained from the basic polymodal K by adding a Kozen-Park style fixpoint axiom and a least fixpoint rule, for each fixpoint connective \sharp\_γ. Provided that each indexing formula γsatisfies the syntactic criterion of being untied in x, we prove this axiom system to be complete. Second, addressing the general case, we prove the soundness and completeness of an extension K+ (Γ) of K\_\sharp (Γ). This extension is obtained via an effective procedure that, given an indexing formula γas input, returns a finite set of axioms and derivation rules for \sharp\_γ, of size bounded by the length of γ. Thus the axiom system K+ (Γ) is finite whenever Γis finite.

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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