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Residual theory in λ-calculus: a formal development*

Published online by Cambridge University Press:  07 November 2008

Gérard Huet
Gérard Huet
Affiliation:
INRIA Rocquencourt, B.P. 105-78153 Le Chesnay Cedex, France
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Abstract

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We present the complete development, in Gallina, of the residual theory of β-reduction in pure λ-calculus. The main result is the Prism Theorem, and its corollary Lévy's Cube Lemma, a strong form of the parallel-moves lemma, itself a key step towards the confluence theorem and its usual corollaries (Church-Rosser, uniqueness of normal forms). Gallina is the specification language of the Coq Proof Assistant (Dowek et al., 1991; Huet 1992b). It is a specific concrete syntax for its abstract framework, the Calculus of Inductive Constructions (Paulin-Mohring, 1993). It may be thought of as a smooth mixture of higher-order predicate calculus with recursive definitions, inductively defined data types and inductive predicate definitions reminiscent of logic programming. The development presented here was fully checked in the current distribution version Coq V5.8. We just state the lemmas in the order in which they are proved, omitting the proof justifications. The full transcript is available as a standard library in the distribution of Coq.

Type
Research Article
Information
Journal of Functional Programming , Volume 4 , Issue 3 , July 1994 , pp. 371 - 394
Copyright
Copyright © Cambridge University Press 1994

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