Proving positive almost sure termination under strategies

  • Authors:
  • Olivier Bournez;Florent Garnier

  • Affiliations:
  • LORIA/INRIA, Villers lès Nancy, France;LORIA/INRIA, Villers lès Nancy, France

  • Venue:
  • RTA'06 Proceedings of the 17th international conference on Term Rewriting and Applications
  • Year:
  • 2006

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Abstract

In last RTA, we introduced the notion of probabilistic rewrite systems and we gave some conditions entailing termination of those systems within a finite mean number of reduction steps. Termination was considered under arbitrary unrestricted policies. Policies correspond to strategies for non-probabilistic rewrite systems. This is often natural or more useful to restrict policies to a subclass. We introduce the notion of positive almost sure termination under strategies, and we provide sufficient criteria to prove termination of a given probabilitic rewrite system under strategies. This is illustrated with several examples.