We present a simple type discipline for the π-calculus which precisely captures the notion of sequential functional computation as a specific class of name passing interactive behaviour. The typed calculus allows direct interpretation of both call-by-name and call-by-value sequential functions. The precision of the representation is demonstrated by way of a fully abstract encoding of PCF.

We show how to build a fully complete model for the maximal theory of the simply typed λ-calculus with k ground constants, k. This is obtained by linear realizability over an affine combinatory algebra of partial involutions from natural numbers into natural numbers. For simplicitly, we give the details of the construction of a fully complete model for k extended with ground permutations. The fully complete minimal model for k can be obtained by carrying out the previous construction over a suitable subalgebra of partial involutions. The full completeness result is then put to use in order to prove some simple results on the maximal theory.

We present the model construction technique called Linear Realizability. It consists in building a category of Partial Equivalence Relations over a Linear Combinatory Algebra. We illustrate how it can be used to provide models, which are fully complete for various typed λ-calculi. In particular, we focus on special Linear Combinatory Algebras of partial involutions, and we present PER models over them which are fully complete, inter alia, w.r.t. the following languages and theories: the fragment of System F consisting of ML-types, the maximal theory on the simply typed λ-calculus with finitely many ground constants, and the maximal theory on an infinitary version of this latter calculus. Key words: Typed lambda-calculi, ML-polymorphic types, linear logic, hyperdoctrines, PER models, Geometry of Interaction, (axiomatic) full completeness

Types in processes delineate specific classes of interactive behaviour in a compositional way. Key elements of process theory, in particular behavioural equivalences, are deeply affected by types, leading to applications in the description and analysis of diverse forms of computing. As one of the examples of types for processes, this paper introduces a second-order polymorphic π-calculus based on duality principles, building on type structures coming from typed π-calculi, Linear Logic and game semantics. Of various extensions of first-order typed π-calculi with polymorphism, the present paper focusses on the linear polymorphic π-calculus, extending its first-order counterpart [46]. Fundamental elements of the theory of linear polymorphic processes are studied, including establishment of their strong normalisability using Girard’s “candidates”, introduction of a behavioural theory of polymorphic labelled transitions which strengthens Pierce-embedding of System F in polymorphic processes, establishing a precise connection between the universe of polymorphic functions and the universe of polymorphic processes. The proof combines processtheoretic nature of polymorphic labelled transitions plays an essential role in full abstraction, elucidating subtle aspects of polymorphism in functions and interaction.

. We present a linear realizability technique for building Partial Equivalence Relations (PER) categories over Linear Combinatory Algebras. These PER categories turn out to be linear categories and to form an adjoint model with their co-Kleisli categories. We show that a special linear combinatory algebra of partial involutions, arising from Geometry of Interaction constructions, gives rise to a fully and faithfully complete model for ML polymorphic types of system F. Keywords: ML-polymorphic types, linear logic, PER models, Geometry of Interaction, full completeness. Introduction Recently, Game Semantics has been used to define fully-complete models for various fragments of Linear Logic ([AJ94a,AM99]), and to give fully-abstract models for many programming languages, including PCF [AJM96,HO96,Nic94], richer functional languages [McC96], and languages with non-functional features such as reference types and non-local control constructs [AM97,Lai97]. All these results are cru...

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