Titlebook: Algol-like Languages; Peter W. O’Hearn,Robert D. Tennent Book 1997 Springer Science+Business Media New York 1997 ALGOL.Computer.Languages.

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Parametricity and Local Variablesve basis for our proposal is the following analogy: a non-local procedure is independent of locally-declared variables in the same way that a parametrically polymorphic function is independent of types to which it is instantiated.

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Global State Considered Unnecessary: Introduction to Object-Based Semanticsd on a notion of . and characterize them in terms of their observable behavior. States are regarded as part of the internal structure of objects and play no role in the observable behavior. It is shown that this leads to considerable accuracy in the semantic modelling of locality and single-threaded

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The Essence of ,ge, simultaneously adapting the possible-worlds model of Reynolds and Oles [Rey81, 01e82] to the parallel setting and generalizing the “transition traces” model of [Bro93] to the procedural setting. This semantics supports reasoning about safety and liveness properties of parallel programs, and vali