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Impossible futures equivalence is the semantic equivalence on labelled transition systems that identifies systems iff they have the same “AGEF” properties: temporal logic properties saying that reaching a desired outcome is not doomed to fail. We show that this equivalence, with an added root condition, is the coarsest congruence containing weak bisimilarity with explicit divergence that respects...
In earlier work, we have shown that two variants of weak fairness can be expressed comparatively easily in the timed process algebra PAFAS. To demonstrate the usefulness of these results, we complement work by Walker [11] and study the liveness property of Dekker’s mutual exclusion algorithm within our process algebraic setting. We also present some results that allow to reduce the state space of...
Traditionally, the various semantics of the process algebra Csp are formulated in denotational style. For many Csp models, e.g., the traces model, equivalent semantics have been given in operational style. A Csp semantics in axiomatic style, however, has been considered problematic in the literature. In this paper we present a sound and complete axiomatic semantics for Csp with unbounded nondeterminism...
In this paper, we investigate transition systems of a class of Petri nets suitable for the modelling and behavioural analysis of globally asynchronous locally synchronous systems. The considered model of Elementary Net Systems with Localities (ENL-systems) is basically that of Elementary Net Systems (EN-systems) equipped with an explicit notion of locality. Each locality identifies a distinct set...
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