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Syntactic Markovian Bisimulation for Chemical Reaction Networks

  • Luca Cardelli
  • Mirco Tribastone
  • Max Tschaikowski
  • Andrea Vandin
Chapter
Part of the Lecture Notes in Computer Science book series (LNCS, volume 10460)

Abstract

In chemical reaction networks (CRNs) with stochastic semantics based on continuous-time Markov chains (CTMCs), the typically large populations of species cause combinatorially large state spaces. This makes the analysis very difficult in practice and represents the major bottleneck for the applicability of minimization techniques based, for instance, on lumpability. In this paper we present syntactic Markovian bisimulation (SMB), a notion of bisimulation developed in the Larsen-Skou style of probabilistic bisimulation, defined over the structure of a CRN rather than over its underlying CTMC. SMB identifies a lumpable partition of the CTMC state space a priori, in the sense that it is an equivalence relation over species implying that two CTMC states are lumpable when they are invariant with respect to the total population of species within the same equivalence class. We develop an efficient partition-refinement algorithm which computes the largest SMB of a CRN in polynomial time in the number of species and reactions. We also provide an algorithm for obtaining a quotient network from an SMB that induces the lumped CTMC directly, thus avoiding the generation of the state space of the original CRN altogether. In practice, we show that SMB allows significant reductions in a number of models from the literature. Finally, we study SMB with respect to the deterministic semantics of CRNs based on ordinary differential equations (ODEs), where each equation gives the time-course evolution of the concentration of a species. SMB implies forward CRN bisimulation, a recently developed behavioral notion of equivalence for the ODE semantics, in an analogous sense: it yields a smaller ODE system that keeps track of the sums of the solutions for equivalent species.

Notes

Acknowledgments

This work was partially supported by the EU project QUANTICOL, 600708. L. Cardelli is partially funded by a Royal Society Research Professorship.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Luca Cardelli
    • 1
  • Mirco Tribastone
    • 2
  • Max Tschaikowski
    • 2
  • Andrea Vandin
    • 2
  1. 1.Microsoft Research and University of OxfordOxfordUK
  2. 2.IMT School for Advanced Studies LuccaLuccaItaly

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