Titlebook: Semantics for Concurrency; Proceedings of the I Marta Zofia Kwiatkowska,Michael William Shields,Ri Conference proceedings 1990 Springer-Ver

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A Denotational Semantics for Synchronous and Asynchronous Behavior with Multiform Time,ny means that parallel components execute within the same timing regime—e.g., because they share the same clock—whereas asynchrony means that the timing regimes of the components are independent—e.g., because their clocks are unrelated. The semantics allows the timing of components. But time is . in

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From Failure to Success: Comparing a Denotational and a Declarative Semantics for Horn Clause Logic by contrasting models based on interleaving, on the one hand, to models based on maximal parallelism, on the other. We make use of complete metric spaces as an important mathematical tool, both in defining and in comparing the various models.

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Negations of Transactions and Their Use in the Specification of Dynamic and Deontic Integrity Constnvestigate their (non-trivial) semantics in two stages: firstly a uniform semantics in terms of uninterpreted events, secondly a non-uniform semantics in terms of state (world) transforming functions. In particular we show the use of negated transactions in deontic integrity constraints.

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Iteration Theories of Synchronization Trees,nization trees are shown to be the free theories in the subclass of synchronization theories. Moreover, the bisimulation equivalence classes of regular synchronization trees are shown to be the free synchronization theories satisfying an ‘infinite’ idempotency law.

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,Causal Automata I: Confluence ≡ {AND, OR} Causality,tomata permit complex causal relationships to be specified in a straightforward manner while having at the same time a simple and intuitive operational behaviour. Our main result, which follows on from earlier work in [4,5], uses causal automata to give a characterisation of Milner’s notion of confl

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Formalizing the Behaviour of Parallel Object-Based Systems by Petri Nets,allel Object-based Transition system). In a POT, parallelism, objects, references, communication, and creation are handled explicitly. Some basic properties of object-based systems are formalized as properties of POTs, viz. properties concerning reference passing and handshaking. Non-interleaving ob

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