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arXiv 1807.07091cs.LO
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参数化时间自动机中的语言保持问题

Language Preservation Problems in Parametric Timed Automata

Étienne André, Didier Lime, Nicolas Markey

AI总结:

本文研究参数化时间自动机中非定时语言与迹保持问题的可判定性,证明一般情形不可判定,但单时钟及单参数确定性L/U-PTA可判定,并考虑鲁棒版本。

摘要:

参数化时间自动机(PTA)是一种强大的形式化方法,用于建模和推理具有某些未知时间延迟的并发系统。在本文中,我们研究了(非定时)语言保持和迹保持问题:给定一个参考参数估值,是否存在另一个参数估值,使得其具有相同的非定时语言或相同的迹集合?我们证明,对于一般PTA以及受限的L/U-PTA类,这些问题都是不可判定的,即使参数取整数值或时间有界也是如此。另一方面,我们展示了可判定的子类:单时钟PTA,以及单参数确定性L-PTA和U-PTA。我们还考虑了这些问题的鲁棒版本,其中额外要求语言在参考估值和新估值之间的所有估值上都保持不变。

英文摘要:

Parametric timed automata (PTA) are a powerful formalism to model and reason about concurrent systems with some unknown timing delays. In this paper, we address the (untimed) language- and trace-preservation problems: given a reference parameter valuation, does there exist another parameter valuation with the same untimed language, or with the same set of traces? We show that these problems are undecidable both for general PTA and for the restricted class of L/U-PTA, even for integer-valued parameters, or over bounded time. On the other hand, we exhibit decidable subclasses: 1-clock PTA, and 1-parameter deterministic L-PTA and U-PTA. We also consider robust versions of these problems, where we additionally require that the language be preserved for all valuations between the reference valuation and the new valuation.

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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