2008 | OriginalPaper | Buchkapitel
The Common Fragment of ACTL and LTL
verfasst von : Mikołaj Bojańczyk
Erschienen in: Foundations of Software Science and Computational Structures
Verlag: Springer Berlin Heidelberg
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The paper explores the relationship between tree languages definable in LTL, CTL, and ACTL, the fragment of CTL where only universal path quantification is allowed. The common fragment of LTL and ACTL is shown to be strictly smaller than the common fragment of LTL and CTL. Furthermore, an algorithm is presented for deciding if an LTL formula can be expressed in ACTL. This algorithm uses an effective characterization of level 3/2 of the concatenation hierarchy for infinite words, also a new result.