Complete Proof Systems for Observation Congruences in Finite-Control pi-Calculus

Proof systems for weak bisimulation congruences in the finite-control π-calculus are presented and their completeness proved. This study consists of two major steps: first complete proof systems for guarded recursions arc obtained; then sound laws sufficient to remove any unguarded recursions are formulated. These results lift Milner's axiomatisation for observation congruence in regular pure-CCS to the π-calculus. The completeness proof relies on the symbolic bisimulation technique.