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+<HTML><HEAD><TITLE>FOL/ReadMe</TITLE></HEAD><BODY>
+
+<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>
+</BODY></HTML>