Second Order Isomorphic Types: A Proof Theoretic Study on Second Order λ-Calculus with Surjective Pairing and Terminal Object
Identifieur interne : 002332 ( Istex/Curation ); précédent : 002331; suivant : 002333Second Order Isomorphic Types: A Proof Theoretic Study on Second Order λ-Calculus with Surjective Pairing and Terminal Object
Auteurs : R. Dicosmo [États-Unis]Source :
- Information and Computation [ 0890-5401 ] ; 1995.
Abstract
Abstract: We investigate invertible terms and isomorphic types in the second order lambda calculus extended with surjective pairs and terminal (or Unit) type. These two topics are closely related: on one side, the study of invertibility is a necessary tool for the characterization of isomorphic types; on the other hand, we need the notion of isomorphic types to study the typed invertible terms. The result of our investigation is twofold: we give a constructive characterization of the invertible terms, extending previous work by Dezani and Bruce-Longo, and a decidable equational theory of the isomorphisms of types which hold in all models of the calculus, which is a conservative extension to the second order case of the results previously achieved for the case of first order typed calculi. Via the Curry-Howard correspondence, this work also provides a decision procedure for strong equivalence of formulae in second order intuitionistic positive propositional logic, that is suitable to search equivalent proofs in automated deduction systems.
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DOI: 10.1006/inco.1995.1085
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<front><div type="abstract" xml:lang="en">Abstract: We investigate invertible terms and isomorphic types in the second order lambda calculus extended with surjective pairs and terminal (or Unit) type. These two topics are closely related: on one side, the study of invertibility is a necessary tool for the characterization of isomorphic types; on the other hand, we need the notion of isomorphic types to study the typed invertible terms. The result of our investigation is twofold: we give a constructive characterization of the invertible terms, extending previous work by Dezani and Bruce-Longo, and a decidable equational theory of the isomorphisms of types which hold in all models of the calculus, which is a conservative extension to the second order case of the results previously achieved for the case of first order typed calculi. Via the Curry-Howard correspondence, this work also provides a decision procedure for strong equivalence of formulae in second order intuitionistic positive propositional logic, that is suitable to search equivalent proofs in automated deduction systems.</div>
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