Branching bisimulation for probabilistic systems: Characteristics and decidability

Suzana Andova, Tim A.C. Willemse*

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademic

    24 Citations (Scopus)

    Abstract

    We address the concept of abstraction in the setting of probabilistic reactive systems, and study its formal underpinnings for the strictly alternating model of Hansson. In particular, we define the notion of branching bisimilarity and study its properties by studying two other equivalence relations, viz. coloured trace equivalence and branching bisimilarity using maximal probabilities. We show that both alternatives coincide with branching bisimilarity. The alternative characterisations have their own merits and focus on different aspects of branching bisimilarity. Coloured trace equivalence can be understood without knowledge of probability theory and is independent of the notion of a scheduler. Branching bisimilarity, rephrased in terms of maximal probabilities gives rise to an algorithm of polynomial complexity for deciding the equivalence. Together they give a better understanding of branching bisimilarity. Furthermore, we show that the notions of branching bisimilarity in the alternating model of Hansson and in the non-alternating model of Segala differ: branching bisimilarity in the latter setting turns out to discriminate between systems that are intuitively branching bisimilar.
    Original languageEnglish
    Pages (from-to)325-355
    JournalTheoretical computer science
    Volume356
    Issue number3
    DOIs
    Publication statusPublished - 2006

    Keywords

    • Abstraction
    • Probabilistic systems
    • Branching bisimulation
    • Alternating model

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