<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!-- $Id$ --><html><head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <title>FOL/README</title></head><body><h2>FOL: First-Order Logic with Natural Deduction</h2>This directory contains the ML sources of the Isabelle system forFirst-Order Logic (constructive and classical versions). For aclassical 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 naturaldeduction in general.)<li>Antony Galton, Logic for Information Technology (Wiley, 1990)<li>Michael Dummett, Elements of Intuitionism (Oxford, 1977)</ul></body></html>