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Nested Timed Automata with Invariants

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Dependable Software Engineering. Theories, Tools, and Applications (SETTA 2017)

Part of the book series: Lecture Notes in Computer Science ((LNPSE,volume 10606))

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Abstract

Invariants are usually adopted into timed systems to constrain the time passage within each control location. It is well-known that a timed automaton with invariants can be encoded to an equivalent one without invariants. When recursions are taken into consideration, few results show whether invariants affect expressiveness. This paper investigates the effect of invariants to Nested Timed Automata (NeTAs), a typical real-timed recursive system. In particular, we study the reachability problem for NeTA-Is, which extend NeTAs with invariants. It is shown that the reachability problem is undecidable on NeTA-Is with a single global clock, while it is decidable when no invariants are given. Furthermore, we also show that the reachability is decidable if the NeTA-Is contains no global clocks by showing that a good stack content still satisfies well-formed constraints.

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Notes

  1. 1.

    The NeTAs here are called “NeTA-Fs” in [5].

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Acknowledgements

This work is supported by National Natural Science Foundation of China with grant Nos. 61472240, 61672340, 61472238, and the NSFC-JSPS bilateral joint research project with grant No. 61511140100.

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Correspondence to Guoqiang Li .

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Wang, Y., Li, G., Yuen, S. (2017). Nested Timed Automata with Invariants. In: Larsen, K., Sokolsky, O., Wang, J. (eds) Dependable Software Engineering. Theories, Tools, and Applications. SETTA 2017. Lecture Notes in Computer Science(), vol 10606. Springer, Cham. https://doi.org/10.1007/978-3-319-69483-2_5

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  • DOI: https://doi.org/10.1007/978-3-319-69483-2_5

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-69482-5

  • Online ISBN: 978-3-319-69483-2

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