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