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Computational Effects and Operations: An Overview
, 2004
"... We overview a programme to provide a unified semantics for computational effects based upon the notion of a countable enriched Lawvere theory. We define the notion of countable enriched Lawvere theory, show how the various leading examples of computational effects, except for continuations, give ris ..."
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Cited by 26 (8 self)
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We overview a programme to provide a unified semantics for computational effects based upon the notion of a countable enriched Lawvere theory. We define the notion of countable enriched Lawvere theory, show how the various leading examples of computational effects, except for continuations, give rise to them, and we compare the definition with that of a strong monad. We outline how one may use the notion to model three natural ways in which to combine computational effects: by their sum, by their commutative combination, and by distributivity. We also outline a unified account of operational semantics. We present results we have already shown, some partial results, and our plans for further development of the programme.
Names, Equations, Relations: Practical Ways to Reason about new
, 1996
"... The nucalculus of Pitts and Stark is a typed lambdacalculus, extended with state in the form of dynamicallygenerated names. These names can be created locally, passed around, and compared with one another. Through the interaction between names and functions, the language can capture notions of sc ..."
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Cited by 6 (0 self)
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The nucalculus of Pitts and Stark is a typed lambdacalculus, extended with state in the form of dynamicallygenerated names. These names can be created locally, passed around, and compared with one another. Through the interaction between names and functions, the language can capture notions of scope, visibility and sharing. Originally motivated by the study of references in Standard ML, the nucalculus has connections to other kinds of local declaration, and to the mobile processes of the calculus. This
Proof Abstraction for Imperative Languages
, 2003
"... Modularity in programming language semantics derives from abstracting over the structure of underlying denotations, yielding semantic descriptions that are more abstract and reusable. One such semantic framework is Liang’s modular monadic semantics in which the underlying semantic structure is encap ..."
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Cited by 2 (1 self)
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Modularity in programming language semantics derives from abstracting over the structure of underlying denotations, yielding semantic descriptions that are more abstract and reusable. One such semantic framework is Liang’s modular monadic semantics in which the underlying semantic structure is encapsulated with a monad. Such abstraction can be at odds with program verification, however, because program specifications require access to the (deliberately) hidden semantic representation. The techniques for reasoning about modular monadic definitions of imperative programs introduced here overcome this barrier. And, just like program definitions in modular monadic semantics, our program specifications and proofs are representationindependent and hold for whole classes of monads, thereby yielding proofs of great generality.