| author | wenzelm |
| Mon, 09 Mar 2009 11:56:34 +0100 | |
| changeset 30381 | a59d792d0ccf |
| parent 28504 | 7ad7d7d6df47 |
| child 33686 | 8e33ca8832b1 |
| permissions | -rw-r--r-- |
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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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<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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7ad7d7d6df47
simplified main Isabelle executables: removed Isabelle and isabelle (replaced by isabelle-process), renamed isatool to isabelle;
wenzelm
parents:
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changeset
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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 (->) 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> |