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arXiv 0906.4711cs.LO
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线性时态逻辑中度量信息的松弛

On Relaxing Metric Information in Linear Temporal Logic

Carlo A. Furia, Paola Spoletini

摘要:

度量LTL公式依赖于next运算符来编码时间距离,而定性LTL公式仅使用until运算符。本文展示了如何将任何度量LTL公式M转换为定性公式Q,使得Q是可满足的当且仅当M在关于M中使用的最大距离的可变性有界的词上是可满足的(即,下一个的出现),但是Q的大小与这样的距离无关。除了理论上的兴趣,这一结果可以帮助简化验证系统的时间粒度的异质性,需要大的距离来表达粗粒度的动态细粒度的时间单位。

英文摘要:

Metric LTL formulas rely on the next operator to encode time distances, whereas qualitative LTL formulas use only the until operator. This paper shows how to transform any metric LTL formula M into a qualitative formula Q, such that Q is satisfiable if and only if M is satisfiable over words with variability bounded with respect to the largest distances used in M (i.e., occurrences of next), but the size of Q is independent of such distances. Besides the theoretical interest, this result can help simplify the verification of systems with time-granularity heterogeneity, where large distances are required to express the coarse-grain dynamics in terms of fine-grain time units.

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