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<h2>Resid -- A theory of residuals</h2>
Ole Rasmussen has ported to Isabelle/ZF the Coq proofs described in the
article
<p>
<pre>
@Article{huet-residual,
author = "{G\'erard} Huet",
title = "Residual Theory in $\lambda$-Calculus: A Formal Development",
journal = JFP,
year = 1994,
volume = 4,
number = 3,
pages = "371--394"}
</pre>
See Rasmussen's report <a
href="http://www.cl.cam.ac.uk/ftp/papers/reports/TR364-or200-church-rosser-isabelle.ps.gz">The Church-Rosser Theorem in Isabelle: A Proof Porting Experiment</a>.
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