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Canonical Solutions to Recursive Equations and Completeness of Equational Axiomatisations

Authors Xinxin Liu, TingTing Yu



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Author Details

Xinxin Liu
  • State Key Laboratory of Computer Science, Institute of Software, Chinese Academy of Sciences, China
  • University of Chinese Academy of Sciences, China
TingTing Yu
  • Beijing Sunwise Information Technology Ltd, China
  • Beijing Institute of Control Engneering, China

Acknowledgements

We thank the reviewers' suggestions which greatly improved the presentation.

Cite AsGet BibTex

Xinxin Liu and TingTing Yu. Canonical Solutions to Recursive Equations and Completeness of Equational Axiomatisations. In 31st International Conference on Concurrency Theory (CONCUR 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 171, pp. 35:1-35:17, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2020)
https://doi.org/10.4230/LIPIcs.CONCUR.2020.35

Abstract

In this paper we prove completeness of four axiomatisations for finite-state behaviours with respect to behavioural equivalences at various τ-abstract levels: branching congruence, delay congruence, η-congruence, and weak congruence. Instead of merging guarded recursive equations, which was the approach originally used by Robin Milner and has since become the standard strategy for proving completeness results of this kind, in this work we take a new approach by solving guarded recursive equations with canonical solutions which are those with the fewest reachable states. The new strategy allows uniform treatment of the axiomatisations with respect to different behavioural equivalences.

Subject Classification

ACM Subject Classification
  • Theory of computation → Process calculi
Keywords
  • Bisimulation
  • Congruence
  • Axiomatisation
  • Soundness and Completeness

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References

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