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Journal of Logic and Computation Advance Access published online on February 16, 2007
Journal of Logic and Computation, doi:10.1093/logcom/exm001
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© The Author, 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Original papers

M. H. Newman's Typability Algorithm for Lambda-calculus

J. Roger Hindley

Mathematics Department, Swansea University, Swansea SA2 8PP, UK. E-mail: j.r.hindley{at}swan.ac.uk

Received 30 January 2006.


  Abstract

This article is essentially an extended review with historical comments. It looks at an algorithm published in 1943 by M. H. A. Newman, which decides whether a lambda-calculus term is typable without actually computing its principal type. Newman's algorithm seems to have been completely neglected by the type-theorists who invented their own rather different typability algorithms over 15 years later.

Keywords: Newman; typable; stratified; Rambda-calculus; typability algorithm


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