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Isabelle

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<p>

<h2>What is Isabelle?</h2>

Isabelle is a popular generic theorem proving environment developed at
Cambridge University (<a
href="http://www.cl.cam.ac.uk/users/lcp/">Larry Paulson</a>) and TU
Munich (<a href="http://www.in.tum.de/~nipkow/">Tobias Nipkow</a>).
See the <a href="overview.html">Isabelle overview</a>.

<p>

These pages provide general information on Isabelle, more specific
information is available from the local pages

<ul>

<li><a
href="http://www.cl.cam.ac.uk/Research/HVG/Isabelle/cambridge.html"><strong>Isabelle
at Cambridge</strong></a>

<li><a href="http://www4.in.tum.de/proj/theoremprov/group.html"><strong>Isabelle
at Munich</strong></a>

</ul>

See there for information on projects done with Isabelle, mailing list
archives, research papers, the Isabelle bibliography, and Isabelle
workshops and courses.

<p>

<h2>Isabelle 2005 - Preview</h2>

<ul>
<li>New command for finding matching rewrite rules</li>
<li>New syntax to allow &gt; and &gt;=</li>
<li>New automatic transitivity reasoner</li>
<li>New command for ad-hoc theory viewing and printing</li>
<li>Much extended and improved theory of finite sets</li>
</ul>

<h2>Contributing</h2> 

Did you have to prove a lemma that should have been part of the
Isabelle distribution?  Send it to us!  
<p> 
We will collect theorems sent to <img border="0" width="162"
height="16" alt="isabelle-lemmas" src="isabelle-lemmas.gif"
valign="center"> and consider them for inclusion into the
distribution.  Lemmas should be general, useful, and not too
large. For larger developments you might want to consider a submission
to the <a href="http://afp.sf.net">Archive of Formal Proofs</a>.


<h2>Course Material, Exercises</h2>

The <a
href="http://isabelle.in.tum.de/coursematerial/">course material</a>
page makes slides, demos, and exercises of a growing number of
Isabelle courses available. It is meant as a resource for people 
who would like to learn Isabelle as well as for those who would like 
to teach it.

<p>

<h2>AFP - The Archive of Formal Proofs</h2>

The <a href="http://afp.sf.net">Archive of Formal Proofs</a> is a
collection of proof libraries, examples, and larger scientifc
developments, mechanically checked in Isabelle. It is organized in the
way of a scientific journal. Submissions are refereed.

<p>

<h2><!-- _GP_ distname --></h2>
New features in <strong><!-- _GP_ distname --></strong> include
<ul>
<li>New image HOL4 with imported library from HOL4 system on top of
  HOL-Complex (about 2500 additional theorems).</li>

<li>New theory Ring_and_Field with over 250 basic numerical laws, 
  all proved in axiomatic type classes for semirings, rings and fields.</li>

<li>New locale <code>ring</code> for non-commutative rings in HOL-Algebra.</li>

<li>Type <code>rat</code> of the rational numbers available in HOL-Complex.</li>

<li>New theory of matrices with an application to linear programming in HOL-Matrix.</li>

<li>Improved locales (named proof contexts), instantiation of locales.</li>

<li>Improved handling of linear and partial orders in simplifier.</li>
 
<li>New <code>specification</code> command for definition by specification.</li>  

<li>New Isar command <code>finalconsts</code> prevents constants being given a definition later.</li>  

<li><code>arith</code> now generates counterexamples for reals as well.</li>

<li>New <code>quickcheck</code> command
    to search for counterexamples of executable goals.
  (see HOL/ex/Quickcheck_Examples.thy)</li>
<li>New <code>refute</code> command
    to search for finite countermodels of goals.
  (see HOL/ex/Refute_Examples.thy)
</li>

<li>Presentation and x-symbol enhancements, greek letters and
sub/superscripts allowed in identifiers.</li>
</ul>
<a href="dist/<!-- _GP_ distname -->/NEWS">[Complete Changelog]</a>
<p>
The <strong><!-- _GP_ distname --></strong> distribution is available
from several <a href="dist/index.html">mirror sites</a>.  It includes
source and binary packages and browsable documentation. You can also
browse the <a href="library/index.html">Isabelle theory library</a>
online. For the curious, there is a nightly generated <a
href="http://isabelle.in.tum.de/devel/">development snapshot</a>
available.

<p>

<h2>Mailing list</h2>

Use the mailing list <a href="mailto:
[e-mail]">[e-mail]</a> 
and its <a href="http://www.cl.cam.ac.uk/users/lcp/archive/">archive</a> to
discuss problems and results.  To subscribe, <a
href="mailto:[e-mail]?subject=subscribe&body=Please%20add%20me%20to%20the%20Isabelle%20mailing%20list">contact Larry Paulson</a>.