Algebraic Theories for Name-Passing Calculi

Joachim Parrow and Davide Sangiorgi

Abstract: In a theory of processes the names are atomic data items which can be exchanged and tested for identity, but which admit no other functions or predicates. A well-known example of a calculus for name-passing is the pi-calculus, where names additionally are used as communication ports. We provide complete axiomatisations of late and early bisimulation equivalences in such calculi. Since neither of the equivalences is a congruence we also axiomatise the corresponding largest congruences. We consider a few variations of the signature of the language; among these, a calculus of deterministic processes which is reminiscent of sequential functional programs with a conditional construct. Most of our axioms are shown to be independent. The structure of the systems reveals the symmetries of the calculi and equivalences since they differ only by a few simple axioms.

LFCS report ECS-LFCS-93-262, April 1993.

This report was published in Information and Computation, 120, pp174-197, August 1995.

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