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Admin/website/overview.html

author | wenzelm |

Wed, 15 Feb 2006 21:34:55 +0100 | |

changeset 19046 | bc5c6c9b114e |

parent 17671 | e9e341bc7d42 |

child 19096 | 991c28e89d32 |

permissions | -rw-r--r-- |

removed distinct, renamed gen_distinct to distinct;

<?xml version='1.0' encoding='iso-8859-1' ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <!-- $Id$ --> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Overview</title> <?include file="//include/htmlheader.include.html"?> </head> <body class="main"> <?include file="//include/header.include.html"?> <div class="hr"><hr/></div> <?include file="//include/navigation.include.html"?> <div class="hr"><hr/></div> <div id="content"> <h2>What is Isabelle?</h2> <p> Isabelle 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 other formalisms. See <a href="logics.html">logics</a> for more details.</p> <p>Isabelle is a joint project between Lawrence C. Paulson (University of Cambridge, UK) and Tobias Nipkow (Technical University of Munich, Germany).</p> <p>Isabelle is distributed <em>freely</em> as Open Source Software <!--a href="//dist/Isabelle/COPYRIGHT"-->BSD license<!--/a-->; see the <a href="installation.html">installation instructions</a>.</p> <h2>Preview of Isabelle</h2> <a href="//media/pg_preview.mov"> <img class="left" src="//img/screenshot_isabelle_pg.png" alt="Isabelle Screenshot" width="250" height="277" /> </a> <p>Here is a <a href="//media/pg_preview.mov">hyperlinked preview</a> demonstrating Isabelle and ProofGeneral, in <a href="http://www.apple.com/quicktime/download/">QuickTime format</a>, and also as a <a href="//media/pg_preview.pdf">non-hyperlinked preview</a> in PDF.</p> <br clear="all"/> <h2>What Isabelle offers</h2> <p>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 proof 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.</p> <p>Isabelle comes with a large theory library 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.</p> <p>With <em>Isar</em>, Isabelle offers a concise proof formulation language which enables a user to write proof scripts naturally understandable for both humans <em>and</em> computers.</p> <p>Isabelle is closely integrated with the <a href= "http://proofgeneral.inf.ed.ac.uk/">ProofGeneral</a> user interface, which eases the task of writing and maintaining proof scripts.</p> <p>Ample <a href="documentation.html">documentation</a> is available about using Isabelle and its inner concepts, including a <a href="http://www4.in.tum.de/~nipkow/LNCS2283/">Tutorial</a> published by Springer-Verlag.</p> </div> <div class="hr"><hr/></div> <?include file="//include/footer.include.html"?> </body> </html>