An Exprssively Complete Linear Time Temporal Logic for Mazurkiewicz Traces.

  • Authors:
  • P. S. Thiagarajan;I. Walukiewicz

  • Affiliations:
  • -;-

  • Venue:
  • LICS '97 Proceedings of the 12th Annual IEEE Symposium on Logic in Computer Science
  • Year:
  • 1997

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Abstract

A basic result concerning LTL, the propositional temporal logic of linear time, is that it is expressively complete; it is equal in expressive power to the first order theory of sequences. We present here a smooth extension of this result to the class of partial orders known as Mazurkiewicz traces. These partial orders arise in a variety of contexts in concurrency theory and they provide the conceptual basis for many of the partial order reduction methods that have been developed in connection with LTL -specifications.We show that LTrL, our linear time temporal logic, is equal in expressive power to the first order theory of traces when interpreted over (finite and) infinite traces. This result fills a prominent gap in the existing logical theory of infinite traces. LTrL also provides a syntactic characterisation of the so called trace consistent (robust) LTL -specifications. These are specifications expressed as LTL formulas that do not distinguish between different linearisations of the same trace and hence are amenable to partial order reduction methods.