A behavioural pseudometric for probabilistic transition systems

  • Authors:
  • Franck van Breugel;James Worrell

  • Affiliations:
  • Department of Computer Science, York University, 4700 Keele Street, Toronto, Canada M3J 1P3;Department of Mathematics, Tulane University, Gibson Hall, 6823 St Charles Avenue, New Orleans LA

  • Venue:
  • Theoretical Computer Science - Automata, languages and programming
  • Year:
  • 2005

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Abstract

Discrete notions of behavioural equivalence sit uneasily with semantic models featuring quantitative data, like probabilistic transition systems. In this paper, we present a pseudometric on a class of probabilistic transition systems yielding a quantitative notion of behavioural equivalence. The pseudometric is defined via the terminal coalgebra of a functor based on a metric on the space of Borel probability measures on a metric space. States of a probabilistic transition system have distance 0 if and only if they are probabilistic bisimilar. We also characterize our distance function in terms of a real-valued modal logic.