|
15585
|
1 |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
|
2 |
|
|
|
3 |
<!-- $Id$ -->
|
|
3799
|
4 |
|
|
|
5 |
<html>
|
|
|
6 |
|
|
|
7 |
<head>
|
|
15585
|
8 |
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
|
|
9 |
<title>The Isabelle Logo</title>
|
|
3799
|
10 |
</head>
|
|
|
11 |
|
|
|
12 |
<body>
|
|
|
13 |
|
|
|
14 |
<h1>The Isabelle Logo</h1>
|
|
|
15 |
|
|
|
16 |
<h2>Versions</h2>
|
|
|
17 |
|
|
6257
|
18 |
The logo is available as bitmap file for the generic Isabelle system
|
|
|
19 |
(<a href="#plain">plain</a>, <a href="#transparent">transparent</a>)
|
|
|
20 |
and major object logics (<a href="#ZF">ZF</a>, <a href="#HOL">HOL</a>,
|
|
|
21 |
<a href="#HOLCF">HOLCF</a>). There are also <a
|
|
5243
|
22 |
href="isabelle-small.xpm">small</a> and <a
|
|
|
23 |
href="isabelle-tiny.xpm">tiny</a> Isabelle icons available.
|
|
6257
|
24 |
Furthermore, scalable (EPS) versions of the logo may be generated for
|
|
|
25 |
any logic using the <tt>isatool logo</tt> utility distributed with
|
|
|
26 |
Isabelle.
|
|
3799
|
27 |
|
|
|
28 |
|
|
|
29 |
<h2>Interpretation</h2>
|
|
|
30 |
|
|
3800
|
31 |
<img src="isabelle.gif" align=right alt="[Isabelle logo]"> First of
|
|
3858
|
32 |
all, the logo tells about the name of the generic system, Isabelle, or
|
|
3800
|
33 |
of its concrete instantiations, e.g. Isabelle/HOL. It also expresses
|
|
3799
|
34 |
some essentials of the overall Isabelle design philosophy: Composition
|
|
|
35 |
of several small well understood building blocks, grouped together or
|
|
|
36 |
arranged in layers. <p>
|
|
|
37 |
|
|
|
38 |
The markings on the cubes illustrate this general principle by example
|
|
3800
|
39 |
of the core meta-logic (which is minimal higher-order logic on top of
|
|
|
40 |
naively polymorphic simply typed lambda calculus). Thus red cubes
|
|
7807
|
41 |
symbolize the type system with function spaces (->) and type
|
|
|
42 |
variables (alpha); violet ones represent the lambda term language with
|
|
|
43 |
beta conversion etc.; yellow cubes constitute the actual logical
|
|
|
44 |
parts, namely meta-implication or entailment (|-) and meta-level
|
|
|
45 |
universal quantification.
|
|
3799
|
46 |
|
|
|
47 |
|
|
|
48 |
<h2>Acknowledgment</h2>
|
|
|
49 |
|
|
3858
|
50 |
The logo is contributed by <a
|
|
|
51 |
href="http://www.informatik.tu-muenchen.de/~wenzel/">Franziska
|
|
7807
|
52 |
Wenzel</a>, Munich. It has been designed on Apple Macintosh.
|
|
3799
|
53 |
|
|
|
54 |
|
|
|
55 |
<p><hr><p>
|
|
|
56 |
|
|
3800
|
57 |
<a name="plain"><img src="isabelle.gif" alt="[Isabelle logo]"></a> <p>
|
|
3799
|
58 |
|
|
15585
|
59 |
<a name="transparent"><img src="isabelle_transparent.gif" alt="[Isabelle logo (transparent)]"></a> Note: This may look bad on
|
|
|
60 |
black and white displays. <p>
|
|
3799
|
61 |
|
|
15585
|
62 |
<a name="ZF"><img src="isabelle_zf.gif" alt="[Isabelle logo (ZF)]"></a> <p>
|
|
3799
|
63 |
|
|
15585
|
64 |
<a name="HOL"><img src="isabelle_hol.gif" alt="[Isabelle logo (HOL)]"></a> <p>
|
|
3799
|
65 |
|
|
15585
|
66 |
<a name="HOLCF"><img src="isabelle_holcf.gif" alt="[Isabelle logo (HOLCF)]"></a>
|
|
3799
|
67 |
|
|
|
68 |
</body>
|
|
|
69 |
</html>
|