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<H2>FOL: First-Order Logic with Natural Deduction</H2>
This directory contains the Standard ML sources of the Isabelle system for
First-Order Logic (constructive and classical versions). For a classical
sequent calculus, see LK. Important files include
<DL>
<DT>ROOT.ML
<DD>loads all source files. Enter an ML image containing Pure
Isabelle and type: use "ROOT.ML";<P>
<DT>Makefile
<DD>compiles the files under Poly/ML or SML of New Jersey<P>
<DT>ex
<DD>subdirectory containing examples. To execute them, enter an ML image
containing FOL and type: use "ex/ROOT.ML";<P>
</DL>
Useful references on First-Order Logic:
<UL>
<LI>Antony Galton, Logic for Information Technology (Wiley, 1990)
<LI>Michael Dummett, Elements of Intuitionism (Oxford, 1977)
</UL>
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