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arXiv 1401.6576cs.LOcs.FL
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向一阶片段添加模块化谓词

Adding modular predicates to first-order fragments

Luc Dartois, Charles Paperman

摘要:

我们调查的可定义性问题的一阶逻辑片段的可判定性有限词丰富的模块谓词。我们的方法的目标是最通用的语句,我们可以实现,它成功地涵盖了量词交替层次的一阶逻辑和它的一些片段。我们得到,决定这个问题的每一个层次的交替层次的一阶逻辑和它的两个变量片段时,配备了所有的正则数值谓词是不困难的,比决定它的相应级别只配备了线性顺序和继任者。对于双变量片段,我们也处理了只包含顺序和模谓词的签名的情况。这证明了两个-在一阶逻辑的情况下,这个问题对于大于二的层次仍然是开放的。证明的主要成分也是一阶公式的句法变换作为有限范畴的代数框架。

英文摘要:

We investigate the decidability of the definability problem for fragments of first order logic over finite words enriched with modular predicates. Our approach aims toward the most generic statements that we could achieve, which successfully covers the quantifier alternation hierarchy of first order logic and some of its fragments. We obtain that deciding this problem for each level of the alternation hierarchy of both first order logic and its two-variable fragment when equipped with all regular numerical predicates is not harder than deciding it for the corresponding level equipped with only the linear order and the successor. For two-variable fragments we also treat the case of the signature containing only the order and modular predicates.Relying on some recent results, this proves the decidability for each level of the alternation hierarchy of the two-variable first order fragmentwhile in the case of the first order logic the question remains open for levels greater than two.The main ingredients of the proofs are syntactic transformations of first order formulas as well as the algebraic framework of finite categories.

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