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<html>
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<!-- $Id$ -->
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<head>
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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 for the generic Isabelle system (<a
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href="#plain">plain</a>, <a href="#transparent">transparent</a>) and
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major object logics (<a href="#ZF">ZF</a>, <a href="#HOL">HOL</a>, <a
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href="#HOLCF">HOLCF</a>).
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<h2>Interpretation</h2>
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<img src="isabelle.gif" align=right alt="Isabelle logo"> First of all
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the logo tells about the name of the generic system, Isabelle, or of
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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 naively polymorphic simply typed
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lambda calculus with minimal higher-order logic). Thus red cubes
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symbolize the type system with function spaces (->) and type variables
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(alpha); violet ones represent the lambda term language with beta
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conversion etc.; yellow cubes constitute the actual logical parts,
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namely meta-implication or entailment (|-) and meta-level universal
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quantification.
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<h2>Acknowledgment</h2>
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The logo is contributed by Franziska Wenzel, Munich. Thanks
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Franziska! <p>
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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"
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alt="Isabelle logo (transparent)"></a> <p>
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<a name="ZF"><img src="isabelle_zf.gif" alt="Isabelle logo (ZF)"></a>
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<p>
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<a name="HOL"><img src="isabelle_hol.gif" alt="Isabelle logo
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(HOL)"></a> <p>
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<a name="HOLCF"><img src="isabelle_holcf.gif" alt="Isabelle logo
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(HOLCF)"></a> <p>
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</body>
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</html>
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