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-<h2>FOL: First-Order Logic with Natural Deduction</h2>
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-This directory contains the ML sources of the Isabelle system for
-First-Order Logic (constructive and classical versions). For a
-classical sequent calculus, see LK.<p>
-
-The <tt>ex</tt> subdirectory contains some examples.<p>
-
-Useful references on First-Order Logic:
-
-<ul>
-<li>Simon Thompson, Type Theory and Functional Programming (Addison-Wesley, 1991)<br>
-(The first chapter is an excellent introduction to natural
-deduction in general.)
-<li>Antony Galton, Logic for Information Technology (Wiley, 1990)
-<li>Michael Dummett, Elements of Intuitionism (Oxford, 1977)
-</ul>
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