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+ LCF: Logic for Computable Functions
+
+This directory contains the Standard ML sources of the Isabelle system for
+LCF. It is loaded upon FOL, not Pure Isabelle. Important files include
+
+ROOT.ML -- loads all source files. Enter an ML image containing FOL and
+type: use "ROOT.ML";
+
+Makefile -- compiles the files under Poly/ML or SML of New Jersey
+
+ex.ML -- files containing examples. To execute them, enter an ML image
+containing LCF and type: use "ex.ML";
+
+Useful references on LCF:
+
+ Lawrence C. Paulson,
+ Logic and Computation: Interactive proof with Cambridge LCF (CUP, 1987)
+