See the current pdf in Arxiv Robin Milner’s book Communication and Concurrency involves a take on state machines that is fundamentally incorrect. “Now in standard automata theory, an automaton is interpreted as a language i.e. as a set of strings
Process algebra reconsidered
Paper is here. The following incorrect claim is not unusual in the process algebra literature. Basically, what is missing [in classical automata theory] is the notion of interaction: during the execution from initial state to final state, a system may
Process Algebra and classical automata
The long awaited process algebra paper is now finally available in PDF Reducing Process Algebra.
Robin Milner and Automata theory

I always had the impression that the entire group of “process algebra” people didn’t know much about automata, but this is surprising. But meanwhile I got somehow interested, and I don’t know how, in concurrency. I remember that, without linking
