Abstract

Moggi's computational lambda calculus is a metalanguage for denotational semantics which arose from the observation that many different notions of computation have the categorical structure of a strong monad on a cartesian closed category. In this paper we show that the computational lambda calculus also arises naturally as the term calculus corresponding (by the Curry-Howard correspondence) to a novel intuitionistic modal propositional logic. We give natural deduction, sequent calculus and Hilbert-style presentations of this logic and prove a strong normalisation result. 1 Introduction The computational lambda calculus was introduced by Moggi as a metalanguage for denotational semantics which more faithfully models real programming language features such as non-termination, differing evaluation strategies, non-determinism and side-effects than does the ordinary simply typed lambda calculus [17, 18]. The starting point for Moggi's work is an explicit semantic distinction between compu...

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