arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1810.04763cs.LO
收藏

递归方案、MSO逻辑与U量词

Recursion Schemes, the MSO Logic, and the U quantifier

Paweł Parys

AI总结:

本文证明了对递归方案生成的树,在MSO逻辑基础上增加受限的U量词(表示对任意大有限集为真)后,模型检验问题仍可判定,且该逻辑具有反射性和有效选择性质。

摘要:

我们研究了递归方案的模型检验问题:给定一个高阶递归方案生成的树是否满足给定的逻辑句子。已知该问题对于MSO逻辑的句子是可判定的。我们证明了MSO的一种扩展的可判定性,在该扩展中我们额外拥有一个无界量词U,它表示一个子公式对于任意大的有限集合为真。该量词只能用于所有自由变量表示有限集合的子公式(而对量词的无限制使用会导致不可判定性)。我们还证明了该逻辑对于递归方案生成的树具有反射性和有效选择性质。

英文摘要:

We study the model-checking problem for recursion schemes: does the tree generated by a given higher-order recursion scheme satisfy a given logical sentence. The problem is known to be decidable for sentences of the MSO logic. We prove decidability for an extension of MSO in which we additionally have an unbounding quantifier U, saying that a subformula is true for arbitrarily large finite sets. This quantifier can be used only for subformulae in which all free variables represent finite sets (while an unrestricted use of the quantifier leads to undecidability). We also show that the logic has the properties of reflection and effective selection for trees generated by recursion schemes.

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。

↑