A probabilistic applied pi-calculus

  • Authors:
  • Jean Goubault-Larrecq;Catuscia Palamidessi;Angelo Troina

  • Affiliations:
  • LSV, ENS Cachan, Cachan, France;LIX, École Polytechnique, Palaiseau, France;LSV, ENS Cachan, Cachan, France and LIX, École Polytechnique, Palaiseau, France

  • Venue:
  • APLAS'07 Proceedings of the 5th Asian conference on Programming languages and systems
  • Year:
  • 2007

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Abstract

We propose an extension of the Applied Pi-calculus by introducing nondeterministic and probabilistic choice operators. The semantics of the resulting model, in which probability and nondeterminism are combined, is given by Segala's Probabilistic Automata driven by schedulers which resolve the nondeterministic choice among the probability distributions over target states. Notions of static and observational equivalence are given for the enriched calculus. In order to model the possible interaction of a process with its surrounding environment a labeled semantics is given together with a notion of weak bisimulation which is shown to coincide with the observational equivalence. Finally, we prove that results in the probabilistic framework are preserved in a purely nondeterministic setting.