Concurrency, Compositionality, and Correctness: Essays in by Dennis Dams, Ulrich Hannemann, Martin Steffen

By Dennis Dams, Ulrich Hannemann, Martin Steffen

This Festschrift quantity, released in honor of Willem-Paul de Roever, comprises 19 special papers written via the chums and co-workers of the honoree, all eminent scientists of their personal correct. those are preceded by way of an in depth bibliography and rounded off, on the finish of the booklet, with a gallery of photographs.

The subject matter below which the papers were accumulated is Concurrency, Compositionality, and Correctness, reflecting the point of interest of Willem-Paul de Roever's examine occupation. subject matters addressed contain version checking, laptop technological know-how and nation machines, ontology and mereology of domain names, video game conception, compiler correctness, reasonable scheduling and encryption algorithms.

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Extra info for Concurrency, Compositionality, and Correctness: Essays in Honor of Willem-Paul de Roever

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You can think of the joined behaviour as pictured in Fig. 1 on the facing page. 4 General Behaviours We claim that any set of behaviours can be formed from atomic behaviours by applying one or more of the compositions outlined above: simple, concurrent, communicating, consecutive, joined and forked behaviours. , of atomic behaviours. From this set one can then “glue” together one or more behaviours first forming a set of simple behaviours; then concurrent behaviours; then identifying possible communicating behaviours; then possibly joining and forking suitable behaviours, etc.

3 Composite Events Examples: (i) two or more cars crash and (ii) a bridge collapse causes one or more cars or bicyclists and people to plunge into the abyss Synchronising Events. Events in two or more simple behaviours are said to be synchronising iff they are identical. Example: Two cars crashing means that the surfaces of the crash is a channel on which they are synchronising and that the messages being exchanged are “you have crashed with me” Sub-Events. A composite event defines one or more sub-events.

More concretely, “our” ontology consists of entities of the four kinds of specification types: simple entities, operations, events and behaviours. One set of properties is that of an entity being ‘simple’, being ‘an operation’ (or function), being ‘an event’ or being ‘a behaviour’. We shall later introduce further categories of entity properties. 1 Simple Entities In a rather concrete, “mechanistic” sense, we understand simple entities as follows:2 simple entities have properties which we model as types and values.

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