lib/logo/index.html
author wenzelm
Wed, 31 Mar 2021 11:24:46 +0200
changeset 73772 d3f2038198ae
parent 33686 8e33ca8832b1
permissions -rw-r--r--
clarified (again): local tip could be actually more recent;
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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  <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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  <title>The Isabelle Logo</title>
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</head>
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<body>
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<h1>The Isabelle Logo</h1>
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<h2>Versions</h2>
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The logo is available as bitmap file for the generic Isabelle system
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(<a href="#plain">plain</a>, <a href="#transparent">transparent</a>)
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and major object logics (<a href="#ZF">ZF</a>, <a href="#HOL">HOL</a>,
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<a href="#HOLCF">HOLCF</a>).  There are also <a
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href="isabelle-small.xpm">small</a> and <a
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href="isabelle-tiny.xpm">tiny</a> Isabelle icons available.
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Furthermore, scalable (EPS) versions of the logo may be generated for
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any logic using the <tt>isabelle logo</tt> utility distributed with
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Isabelle.
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<h2>Interpretation</h2>
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<img src="isabelle.gif" align=right alt="[Isabelle logo]"> First of
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all, the logo tells about the name of the generic system, Isabelle, or
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of its concrete instantiations, e.g. Isabelle/HOL.  It also expresses
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some essentials of the overall Isabelle design philosophy: Composition
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of several small well understood building blocks, grouped together or
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arranged in layers. <p>
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The markings on the cubes illustrate this general principle by example
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of the core meta-logic (which is minimal higher-order logic on top of
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naively polymorphic simply typed lambda calculus). Thus red cubes
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symbolize the type system with function spaces (-&gt;) and type
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variables (alpha); violet ones represent the lambda term language with
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beta conversion etc.; yellow cubes constitute the actual logical
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parts, namely meta-implication or entailment (|-) and meta-level
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universal quantification.
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<h2>Acknowledgment</h2>
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The logo is contributed by <a
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href="http://www.informatik.tu-muenchen.de/~wenzel/">Franziska
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Wenzel</a>, Munich.  It has been designed on Apple Macintosh.
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<p><hr><p>
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<a name="plain"><img src="isabelle.gif" alt="[Isabelle logo]"></a> <p>
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<a name="transparent"><img src="isabelle_transparent.gif" alt="[Isabelle logo (transparent)]"></a> Note: This may look bad on
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black and white displays. <p>
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<a name="ZF"><img src="isabelle_zf.gif" alt="[Isabelle logo (ZF)]"></a> <p>
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<a name="HOL"><img src="isabelle_hol.gif" alt="[Isabelle logo (HOL)]"></a> <p>
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<a name="HOLCF"><img src="isabelle_holcf.gif" alt="[Isabelle logo (HOLCF)]"></a>
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</body>
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</html>