Added overview page.
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Isabelle overview
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<p>
<a href="http://isabelle.in.tum.de/">Isabelle</a> is a generic proof
assistant. It allows mathematical formulas to be expressed in a formal
language and provides tools for proving those formulas in a logical
calculus. The main application is the formalization of mathematical proofs
and in particular <em>formal verification</em>, which includes proving the
correctness of computer hardware or software and proving properties of
computer languages and protocols.
</p>
<p>Compared with similar tools, Isabelle's distinguishing feature is its flexibility. Most proof assistants are built around a single formal calculus, typically higher-order logic. Isabelle has the capacity to accept a variety of formal calculi. The distributed version supports higher-order logic but also axiomatic set theory and several <a href="logics.html">other formalisms</a>. Isabelle provides excellent notational support: new notations can be introduced, using normal mathematical symbols. Proofs can be written in a structured notation based upon traditional proof style, or more straightforwardly as sequences of commands. Definitions and proofs may include TeX source, from which Isabelle can automatically generate typeset documents.</p>
<p>The main limitation of all such systems is that proving theorems requires
much effort from an expert user. Isabelle incorporates some tools to improve
the user's productivity by automating some parts of the proof process. In
particular, Isabelle's <em>classical reasoner</em> can perform long chains of
reasoning steps to prove formulas. The <em>simplifier</em> can
reason with and about equations. Linear <em>arithmetic</em> facts
are proved automatically. Isabelle is closely
integrated with the
<a href="http://www.cl.cam.ac.uk/users/lcp/papers/protocols.html">Proof
General</a> user interface, which eases the task of writing and maintaining
proof scripts.. </p>
<p>Isabelle comes with large theories of formally verified mathematics, including elementary number theory (for example, Gauss's law of quadratic reciprocity), analysis (basic properties of limits, derivatives and integrals), algebra (up to Sylow's theorem) and set theory (the relative consistency of the Axiom of Choice). Also provided are numerous examples arising from research into formal verification. Isabelle is <a href="dist/">distributed</a> free of charge to academic users.</p>
<p>Ample <a href="dist/docs.html">documentation</a> is available, including a <a href="http://www4.in.tum.de/~nipkow/LNCS2283/">Tutorial</a> published by Springer-Verlag. Several <a href="http://www.cl.cam.ac.uk/users/lcp/papers/isabelle.html">papers</a> on the design of Isabelle are available. There is also a list of past and present <a href="http://www.cl.cam.ac.uk/Research/HVG/Isabelle/projects.html">projects</a> undertaken using Isabelle. </p>
<p>Isabelle is a joint project between <a href="http://www.cl.cam.ac.uk/users/lcp/">Lawrence C. Paulson</a> (University of Cambridge, UK) and <a href="http://www.in.tum.de/~nipkow/">Tobias Nipkow</a> (Technical University of Munich, Germany).</p>