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+ HOL: Higher-Order Logic
+
+This directory contains the Standard ML sources of the Isabelle system for
+Higher-Order Logic. 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 HOL and type: use "ex/ROOT.ML";
+
+Useful references on Higher-Order Logic:
+
+ P. B. Andrews,
+ An Introduction to Mathematical Logic and Type Theory
+ (Academic Press, 1986).
+
+ J. Lambek and P. J. Scott,
+ Introduction to Higher Order Categorical Logic (CUP, 1986)