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Quantifier elimination and parametric polymorphism in programming languages

Part of: JFP Research Articles

Published online by Cambridge University Press:  07 November 2008

Harry G. Mairson
Harry G. Mairson
Affiliation:
Department of Computer Science, Brandeis University, Waltham, MA 02254, USA
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Abstract

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We present a simple and easy-to-understand explanation of ML type inference and parametric polymorphism within the framework of type monomorphism, as in the first order typed lambda calculus. We prove the equivalence of this system with the standard interpretation using type polymorphism, and extend the equivalence to include polymorphic fixpoints. The monomorphic interpretation gives a purely combinatorial understanding of the type inference problem, and is a classic instance of quantifier elimination, as well as an example of Gentzen-style cut elimination in the framework of the Curry-Howard propositions-as-types analogy.

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Articles
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Journal of Functional Programming , Volume 2 , Issue 2 , April 1992 , pp. 213 - 226
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Copyright © Cambridge University Press 1992

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