lib/logo/index.html
author wenzelm
Thu, 27 Aug 1998 11:51:32 +0200
changeset 5384 c974451df466
parent 5243 a0688fa916af
child 6257 ee0b48ab5aea
permissions -rw-r--r--
href eps versions;
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
3799
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
     1
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
     2
<html>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
     3
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
     4
<!-- $Id$ -->
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
     5
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
     6
<head>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
     7
<title>The Isabelle Logo</title>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
     8
</head>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
     9
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    10
<body>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    11
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    12
<h1>The Isabelle Logo</h1>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    13
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    14
<h2>Versions</h2>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    15
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    16
The logo is available for the generic Isabelle system (<a
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    17
href="#plain">plain</a>, <a href="#transparent">transparent</a>) and
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    18
major object logics (<a href="#ZF">ZF</a>, <a href="#HOL">HOL</a>, <a
5243
a0688fa916af added icons;
wenzelm
parents: 4190
diff changeset
    19
href="#HOLCF">HOLCF</a>).  There are also <a
a0688fa916af added icons;
wenzelm
parents: 4190
diff changeset
    20
href="isabelle-small.xpm">small</a> and <a
a0688fa916af added icons;
wenzelm
parents: 4190
diff changeset
    21
href="isabelle-tiny.xpm">tiny</a> Isabelle icons available.
5384
c974451df466 href eps versions;
wenzelm
parents: 5243
diff changeset
    22
Furthermore, there are EPS versions of the <a
c974451df466 href eps versions;
wenzelm
parents: 5243
diff changeset
    23
href="isabelle.eps">plain</a> and the <a
c974451df466 href eps versions;
wenzelm
parents: 5243
diff changeset
    24
href="isabelle_hol.eps">HOL</a> Isabelle logo.
3799
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    25
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    26
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    27
<h2>Interpretation</h2>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    28
3800
wenzelm
parents: 3799
diff changeset
    29
<img src="isabelle.gif" align=right alt="[Isabelle logo]"> First of
3858
wenzelm
parents: 3800
diff changeset
    30
all, the logo tells about the name of the generic system, Isabelle, or
3800
wenzelm
parents: 3799
diff changeset
    31
of its concrete instantiations, e.g. Isabelle/HOL.  It also expresses
3799
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    32
some essentials of the overall Isabelle design philosophy: Composition
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    33
of several small well understood building blocks, grouped together or
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    34
arranged in layers. <p>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    35
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    36
The markings on the cubes illustrate this general principle by example
3800
wenzelm
parents: 3799
diff changeset
    37
of the core meta-logic (which is minimal higher-order logic on top of
wenzelm
parents: 3799
diff changeset
    38
naively polymorphic simply typed lambda calculus). Thus red cubes
3799
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    39
symbolize the type system with function spaces (->) and type variables
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    40
(alpha); violet ones represent the lambda term language with beta
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    41
conversion etc.; yellow cubes constitute the actual logical parts,
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    42
namely meta-implication or entailment (|-) and meta-level universal
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    43
quantification.
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    44
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    45
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    46
<h2>Acknowledgment</h2>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    47
3858
wenzelm
parents: 3800
diff changeset
    48
The logo is contributed by <a
wenzelm
parents: 3800
diff changeset
    49
href="http://www.informatik.tu-muenchen.de/~wenzel/">Franziska
4190
e377947fe1ec fixed spelling;
wenzelm
parents: 3858
diff changeset
    50
Wenzel</a>, Munich.  It has been designed on Apple Macintosh. <p>
3799
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    51
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    52
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    53
<p><hr><p>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    54
3800
wenzelm
parents: 3799
diff changeset
    55
<a name="plain"><img src="isabelle.gif" alt="[Isabelle logo]"></a> <p>
3799
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    56
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    57
<a name="transparent"><img src="isabelle_transparent.gif"
3858
wenzelm
parents: 3800
diff changeset
    58
alt="[Isabelle logo (transparent)]"></a> Note: This may look bad on
wenzelm
parents: 3800
diff changeset
    59
black and white displays.  <p>
3799
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    60
3800
wenzelm
parents: 3799
diff changeset
    61
<a name="ZF"><img src="isabelle_zf.gif" alt="[Isabelle logo
wenzelm
parents: 3799
diff changeset
    62
(ZF)]"></a> <p>
3799
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    63
3800
wenzelm
parents: 3799
diff changeset
    64
<a name="HOL"><img src="isabelle_hol.gif" alt="[Isabelle logo
wenzelm
parents: 3799
diff changeset
    65
(HOL)]"></a> <p>
3799
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    66
3800
wenzelm
parents: 3799
diff changeset
    67
<a name="HOLCF"><img src="isabelle_holcf.gif" alt="[Isabelle logo
wenzelm
parents: 3799
diff changeset
    68
(HOLCF)]"></a> <p>
3799
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    69
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    70
</body>
d00f6460ac4d The Isabelle Logo;
wenzelm
parents:
diff changeset
    71
</html>