In: Future Generation Computer Systems 8, North-Holland. 1992.
Abstract: We introduce a new invariant semantics of concurrent systems which is a direct generalisation of the causal partial order semantics. Our new semantics overcomes some of the problems encountered when one uses causal partial orders alone. We discuss various aspects of the new invariant model. In particular, we outline how the new invariants can be generated by 1-safe inhibitor Petri nets.