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arXiv 0905.4332cs.LO
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论表达力与类不变性

On expressive power and class invariance

Yanjing Wang, Francien Dechesne

摘要:

在计算机科学中,定义了各种逻辑语言来分析系统的属性。找出这些逻辑之间的本质区别的一种方法是比较它们在区分能力和表达能力方面的表达能力。在本文中,我们研究这两个概念,把后者的概念作为前者提升到类的模型。我们展示了一些一般性的结果,提升模型的不变性关系的一类模型,这样,当前者对应于一个逻辑的区分能力,后者对应于它的表达能力,给出一定的紧凑性要求。特别是,我们引入类互模拟的概念来捕捉模态逻辑的表达能力。我们展示了我们的研究结果的应用,通过重新审视模态可定义性与我们的新见解。

英文摘要:

In computer science, various logical languages are defined to analyze properties of systems. One way to pinpoint the essential differences between those logics is to compare their expressivity in terms of distinguishing power and expressive power. In this paper, we study those two concepts by regarding the latter notion as the former lifted to classes of models. We show some general results on lifting an invariance relation on models to one on classes of models, such that when the former corresponds to the distinguishing power of a logic, the latter corresponds to its expressive power, given certain compactness requirements. In particular, we introduce the notion of class bisimulation to capture the expressive power of modal logics. We demonstrate the application of our results by revisiting modal definability with our new insights.

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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