Istituto di Scienza e Tecnologie dell'Informazione     
Degano P., De Nicola R., Montanari U. A distributed operational semantics for CCS based on condition/event systems. In: Acta Informatica, vol. 26 pp. 59 - 91. Springer-Verlag, 1988.
A new set of inference rules for the guarded version of Milner's Calculus of Communicating Systems is proposed. They not only describe the actions agents may perform when in a given state, but also say which parts of the agents move when the global state changes. From the transition relation a particular Petri Net, namely a Condition/Event system called ∑_ccs, is immediately derived. Our construction gives a semantics which is consistent with the interleaving semantics of CCS and exhibits full parallelism. The proof consists of relating the case graph of ∑_CCS with the original and with the multiset (step) transition systems of the calculus.

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