src/HOL/README

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	   CHOL: Higher-Order Logic with curried functions

This directory contains the Standard ML sources of the Isabelle system for
Higher-Order Logic with curried functions.  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 CHOL and type:    use "ex/ROOT.ML";

Subst -- subdirectory defining a theory of substitution and unification.

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)