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arXiv 1005.0505cs.FLcs.LO
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无限单词的排名

Rankers over Infinite Words

Luc Dartois, Manfred Kufleitner, Alexander Lauser

摘要:

我们考虑有限和无限字上的一阶逻辑FO[<]的四个片段FO2,Sigma2和FO2的交集,Pi2和FO2的交集,以及Delta2。对于所有四个片段,我们给出的排名方面的特征。特别是,我们推广的概念,排名无限的话在两种可能的方式。这两个扩展都是自然的,因为在有限词上,它们与经典的秩相一致,而在无限词上,它们都具有FO2的全部表达能力。此外,秩的第一个扩展允许Sigma2和FO2的交集的表征,而另一个扩展导致Pi2和FO2的交集的表征。这两种版本的排名产生的片段Delta2的表征。作为一个副产品,我们还获得了基于明确的时间逻辑和明确的时间间隔逻辑的特征。

英文摘要:

We consider the four fragments FO2, the intersection of Sigma2 and FO2, the intersection of Pi2 and FO2, and Delta2 of first-order logic FO[<] over finite and infinite words. For all four fragments, we give characterizations in terms of rankers. In particular, we generalize the notion of a ranker to infinite words in two possible ways. Both extensions are natural in the sense that over finite words, they coincide with classical rankers and over infinite words, they both have the full expressive power of FO2. Moreover, the first extension of rankers admits a characterization of the intersection of Sigma2 and FO2 while the other leads to a characterization of the intersection of Pi2 and FO2. Both versions of rankers yield characterizations of the fragment Delta2. As a byproduct, we also obtain characterizations based on unambiguous temporal logic and unambiguous interval temporal logic.

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