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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
+<DD>loads all source files.  Enter an ML image containing Pure
+Isabelle and type: use "ROOT.ML";<P>
+<DD>compiles the files under Poly/ML or SML of New Jersey<P>
+<DD>subdirectory containing examples.  To execute them, enter an ML image
+containing FOL and type: use "ex/ROOT.ML";<P>
+Useful references on First-Order Logic:
+<LI>Antony Galton, Logic for Information Technology (Wiley, 1990)
+<LI>Michael Dummett, Elements of Intuitionism (Oxford, 1977)