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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<!-- $Id$ -->
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>Isabelle</title>
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<?include file="//include/htmlheader.include.html"?>
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</head>
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<body class="main">
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<?include file="//include/header.include.html"?>
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<div class="hr"><hr/></div>
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<?include file="//include/navigation.include.html"?>
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<div class="hr"><hr/></div>
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<div id="content">
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<h2>What is Isabelle?</h2>
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<p>
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Isabelle is a popular generic theorem proving environment
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developed at Cambridge University (<a
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href="http://www.cl.cam.ac.uk/users/lcp/">Larry Paulson</a>)
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and TU Munich (<a href="http://www.in.tum.de/~nipkow/">Tobias
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Nipkow</a>). See the <a href="overview.html">Isabelle
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overview</a>.
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</p>
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<p>
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These site provides general information on Isabelle, more
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specific information is available from the local sites
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</p>
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<ul>
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<li><a href="http://www.cl.cam.ac.uk/Research/HVG/Isabelle/cambridge.html"><strong>Isabelle
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at Cambridge</strong></a></li>
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<li><a href="http://www4.in.tum.de/proj/theoremprov/group.html"><strong>Isabelle
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at Munich</strong></a></li>
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</ul>
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<p>
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See there for information on projects done with Isabelle,
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mailing list archives, research papers, the Isabelle
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bibliography, and Isabelle workshops and courses.
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</p>
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<h2>Coming soon: Isabelle 2005</h2>
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<p>New features in the upcoming Isabelle 2005 will include</p>
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<ul>
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<li>New commands for instantiating locales</li>
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<li>New command for finding theorems (by term patterns, as intro/elim/simp rules, etc.)</li>
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<li>New automatic transitivity reasoner</li>
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<li>New command for ad-hoc theory viewing and printing</li>
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<li>Much extended and improved theory of finite sets</li>
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<li>New syntax that will allow > and >= in addition to < and
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<=</li>
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</ul>
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<h2>Isabelle 2004</h2>
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<p>New features in Isabelle 2004 include</p>
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<ul>
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<li>New image HOL4 with imported library from HOL4 system on top of
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HOL-Complex (about 2500 additional theorems).</li>
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<li>New theory Ring_and_Field with over 250 basic numerical laws,
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all proved in axiomatic type classes for semirings, rings and fields.</li>
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<li>New locale <code>ring</code> for non-commutative rings in HOL-Algebra.</li>
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<li>Type <code>rat</code> of the rational numbers available in HOL-Complex.</li>
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<li>New theory of matrices with an application to linear programming in HOL-Matrix.</li>
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<li>Improved locales (named proof contexts), instantiation of locales.</li>
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<li>Improved handling of linear and partial orders in simplifier.</li>
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<li>New <code>specification</code> command for definition by specification.</li>
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<li>New Isar command <code>finalconsts</code> prevents constants being given a definition later.</li>
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<li><code>arith</code> now generates counterexamples for reals as well.</li>
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<li>New <code>quickcheck</code> command
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to search for counterexamples of executable goals.
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(see HOL/ex/Quickcheck_Examples.thy)</li>
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<li>New <code>refute</code> command
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to search for finite countermodels of goals.
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(see HOL/ex/Refute_Examples.thy)
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</li>
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<li>Presentation and x-symbol enhancements, greek letters and
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sub/superscripts allowed in identifiers.</li>
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</ul>
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<p><a href="//dist/packages/Isabelle/NEWS">[Complete Changelog]</a></p>
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<h2>Download</h2>
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<p>
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The Isabelle distribution is distributed <em>for free</em> and available
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from several <a href="mirrors.html">mirror sites</a>. It includes
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source and binary packages and browsable documentation. You can also
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browse the <a href="//library/index.html">Isabelle theory library</a>
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online.
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</p>
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<p>
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Use the mailing list <a href=
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"mailto:isabelle-users@cl.cam.ac.uk">isabelle-users@cl.cam.ac.uk</a> and its
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<a href="http://www.cl.cam.ac.uk/users/lcp/archive/">archive</a> to
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discuss problems and results. To subscribe, <a href=
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"mailto:Cl-isabelle-users-request@lists.cam.ac.uk?subject=subscribe">
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contact our robot</a>.
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</p>
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</div>
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<div class="hr"><hr/></div>
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<?include file="//include/footer.include.html"?>
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</body>
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</html>
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