Copyright © 2006 Elsevier B.V. All rights reserved.
Program Extraction From Proofs of Weak Head Normalization
Available online 10 May 2006.
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Abstract
We formalize two proofs of weak head normalization for the simply typed lambda-calculus in first-order minimal logic: one for normal-order reduction, and one for applicative-order reduction in the object language. Subsequently we use Kreisel's modified realizability to extract evaluation algorithms from the proofs, following Berger; the proofs are based on Tait-style reducibility predicates, and hence the extracted algorithms are instances of (weak head) normalization by evaluation, as already identified by Coquand and Dybjer.
Keywords: program extraction; normalization by evaluation; weak head normalization






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