Abstract
We consider a class of Petri Net structures where the existence of a liveness enforcing supervisory policy (LESP) for an initial marking implies there is a LESP for a larger initial marking. That is, the set of initial markings for which there is a LESP for any instance of this class is right-closed. If a transition is prevented from firing at a marking by a LESP, and all LESPs, irrespective of the implementation-paradigm that is chosen, prescribe the same control for the marking, then it is a minimally restrictive LESP. It is possible to synthesize the minimally restrictive LESP for any instance of this class that uses this right-closed set of markings. Alternately, one could consider invariant-based monitors for liveness enforcement in an instance of this class.
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