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arXiv 1804.08883cs.LOcs.FL
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带模谓词的逻辑片段的覆盖与分离

Covering and separation for logical fragments with modular predicates

Thomas Place, Varun Ramanathan, Pascal Weil

AI总结:

本文研究一阶逻辑片段在添加模谓词后,其分离与覆盖问题可归约为原始逻辑的相应问题,并给出通用转移定理。

摘要:

对于每一类词语言$\mathscr{C}$,可以关联一个称为$\mathscr{C}$-分离的决策问题。给定两个正则语言,该问题询问是否存在$\mathscr{C}$中的第三种语言包含第一个语言,同时与第二个语言不相交。通常,找到判定$\mathscr{C}$-分离的算法能带来对$\mathscr{C}$的深刻理解。我们考虑由一阶逻辑片段定义的类。给定这样的片段,人们通常可以通过在其签名中添加更多谓词来构建更大的类。在本文中,我们研究了用模谓词丰富签名的操作。我们的主要定理是这一构造的通用转移结果。非正式地说,我们证明:当一个逻辑片段配备包含后继谓词的签名时,用模谓词增强的更强逻辑的分离问题可归约为原始逻辑的分离问题。该结果实际上适用于更一般的决策问题,即覆盖问题。

英文摘要:

For every class $\mathscr{C}$ of word languages, one may associate a decision problem called $\mathscr{C}$-separation. Given two regular languages, it asks whether there exists a third language in $\mathscr{C}$ containing the first language, while being disjoint from the second one. Usually, finding an algorithm deciding $\mathscr{C}$-separation yields a deep insight on $\mathscr{C}$. We consider classes defined by fragments of first-order logic. Given such a fragment, one may often build a larger class by adding more predicates to its signature. In the paper, we investigate the operation of enriching signatures with modular predicates. Our main theorem is a generic transfer result for this construction. Informally, we show that when a logical fragment is equipped with a signature containing the successor predicate, separation for the stronger logic enriched with modular predicates reduces to separation for the original logic. This result actually applies to a more general decision problem, called the covering problem.

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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