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