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arXiv 2307.09679cs.LO
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带路径上关系的模态逻辑:通过共单子语义的理论发展

Modal Logic with Relations over Paths: a Theoretical Development through Comonadic Semantics

Santiago Figueira, Gabriel Goren-Roig

AI总结:

本研究提出路径谓词模态逻辑PPML,通过共单子语义建立其模型论性质,关联DataGL等数据感知逻辑与基本模态逻辑,实现多项式时间归约。

摘要:

博弈共单子为有限模型论中的比较博弈提供了范畴论语义,从而为广泛的逻辑提供了逻辑等价性的抽象刻画,每一种逻辑都通过特定的共单子选择来刻画。受将共单子工具应用于数据感知逻辑(如CoreDataXPath)研究的目标驱动,本工作中我们提出了一种模态逻辑的推广形式,它允许将任意元数的关系符号作为语法原子,我们称之为路径谓词模态逻辑(Path Predicate Modal Logic,PPML)。我们说明该逻辑源于对先前研究的CoreDataXPath片段DataGL的视角转变,并证明对于特定的符号选择,PPML可以复现DataGL。我们认为这种视角转变能够捕获和设计新的数据感知逻辑。我们为PPML引入了资源受限的模拟和互模拟博弈,并证明了关联互模拟性与逻辑等价性的Hennessy-Milner性质。我们定义了PPML共单子,并证明它可以刻画这些博弈。我们通过系统地利用共单子框架,发展了对PPML的模型论理解。这包括树模型性质,以及利用正PPML公式与典范模型之间的对应关系给出单向Hennessy-Milner性质的另一种证明等结果。我们还利用共单子视角建立了与其他逻辑的联系,一方面是一阶逻辑的有界量词秩和有界变元数片段,另一方面是基本模态逻辑,并展示了PPML共单子如何为我们最初的研究动机DataGL诱导出一种无语法的逻辑等价性刻画。关于基本模态逻辑,从PPML展开到Kripke树的函子式指派使我们能够获得从PPML问题到其基本模态逻辑对应问题的多项式时间归约。

英文摘要:

Game comonads provide categorical semantics for comparison games in Finite Model Theory, thus providing an abstract characterisation of logical equivalence for a wide range of logics, each one captured through a specific choice of comonad. Motivated by the goal of applying comonadic tools to the study of data-aware logics such as CoreDataXPath, in this work we introduce a generalisation of Modal Logic that allows relation symbols of arbitrary arity as atoms of the syntax, which we call Path Predicate Modal Logic or PPML. We motivate this logic as arising from a shift in perspective on a previously studied fragment of CoreDataXPath, called DataGL, and prove that PPML recovers DataGL for a specific choice of signature. We argue that this shift in perspective allows the capturing and designing of new data-aware logics. We introduce resource-bounded simulation and bisimulation games for PPML and show the Hennessy-Milner property relating bisimilarity and logical equivalence. We define the PPML comonad and prove that it captures these games. We develop the model-theoretical understanding of PPML by making systematic use of the comonadic framework. This includes results such as a tree-model property and an alternative proof of the one-way Hennessy-Milner property using a correspondence between positive PPML formulas and canonical models. We also use the comonadic perspective to establish connections with other logics, such as bounded quantifier rank and bounded variable number fragments of First Order Logic on one side and Basic Modal Logic on the other, and show how the PPML comonad induces a syntax-free characterisation of logical equivalence for DataGL, our original motivation. With respect to Basic Modal Logic, a functorial assignment from PPML unravellings into Kripke trees enables us to obtain polynomial-time reductions from PPML problems to their Basic Modal Logic counterparts.

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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