Making Metric Temporal Logic Rational

Authors Shankara Narayanan Krishna, Khushraj Madnani, Paritosh K. Pandya

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Shankara Narayanan Krishna
Khushraj Madnani
Paritosh K. Pandya

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Shankara Narayanan Krishna, Khushraj Madnani, and Paritosh K. Pandya. Making Metric Temporal Logic Rational. In 42nd International Symposium on Mathematical Foundations of Computer Science (MFCS 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 83, pp. 77:1-77:14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)


We study an extension of MTL in pointwise time with regular expression guarded modality Reg_I(re) where re is a rational expression over subformulae. We study the decidability and expressiveness of this extension (MTL+Ureg+Reg), called RegMTL, as well as its fragment SfrMTL where only star-free rational expressions are allowed. Using the technique of temporal projections, we show that RegMTL has decidable satisfiability by giving an equisatisfiable reduction to MTL. We also identify a subclass MITL+UReg of RegMTL for which our equisatisfiable reduction gives rise to formulae of MITL, yielding elementary decidability. As our second main result, we show a tight automaton-logic connection between SfrMTL and partially ordered (or very weak) 1-clock alternating timed automata.
  • Metric Temporal Logic
  • Timed Automata
  • Regular Expression
  • Equisatisfiability
  • Expressiveness


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