"unify_first_prem_with_concl" (cf. 9ceb585c097a) sometimes throws an exception, but it is very rarely needed -- catch the exception for now
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<H2>LCF: Logic for Computable Functions</H2>
This directory contains the ML sources of the Isabelle system for
LCF, based on FOL.<p>
The <tt>ex</tt> subdirectory contains some examples.<p>
Useful references on LCF:
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<LI>Lawrence C. Paulson,<BR>
Logic and Computation: Interactive proof with Cambridge LCF (CUP, 1987)
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