Admin/page/index.html
author mueller
Thu, 05 Nov 1998 15:33:27 +0100
changeset 5803 06af82bec2f1
parent 5801 d2c97ca3be62
child 5805 e867bc95a47d
permissions -rw-r--r--
made more generic;
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
     1
<html>
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
     2
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
     3
<head>
5794
wenzelm
parents: 5793
diff changeset
     4
<!-- $Id$ -->
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
     5
<title>Isabelle</title>
5795
7ad4d71adfe1 made weblint happy;
wenzelm
parents: 5794
diff changeset
     6
</head>
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
     7
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
     8
<body>
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
     9
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    10
<h1>Isabelle </h1> <a href="http://www.in.tum.de/~isabelle/logo/"><img
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    11
src="isabelle.gif" width=100 align=right alt="[Isabelle logo]"></a>
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    12
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    13
<p>
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    14
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    15
<strong>Isabelle</strong> is a popular generic theorem proving
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    16
environment developed at Cambridge University (<a
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    17
href="http://www.cl.cam.ac.uk/users/lcp/">Larry Paulson</a>) and TU
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    18
Munich (<a href="http://www.in.tum.de/~nipkow/">Tobias Nipkow</a>).
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    19
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    20
<p>
5803
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    21
<a href="http://www.cl.cam.ac.uk/Research/HVG/Isabelle/cambridge.html"><img
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    22
src="cambridge.gif" width=145 border=0 align=right
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    23
alt="[Cambridge]"></a> <a
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    24
href="http://www.in.tum.de/~isabelle/munich.html"><img
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    25
src="munich.gif" width=48 border=0 align=right alt="[Munich]"></a> 
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    26
5803
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    27
This page provides general information on Isabelle, more details are 
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    28
available on the local Isabelle pages  at 
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    29
 <a
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    30
href="http://www.cl.cam.ac.uk/Research/HVG/Isabelle/cambridge.html">Cambridge</a>
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    31
and <a href="http://www.in.tum.de/~isabelle/munich.html">Munich</a>. 
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    32
See there for informations on projects done with Isabelle, mailing list archives, 
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    33
research papers, the Isabelle bibliography, and Isabelle workshops and courses. 
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    34
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    35
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    36
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    37
<h2>Obtaining Isabelle</h2>
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    38
The latest version is <strong>Isabelle98-1</strong>, it is available
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    39
from several mirror sites (given in alphabetical order):
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    40
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    41
<ul>
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    42
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    43
<li> <a
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    44
href="http://www.cl.cam.ac.uk/Research/HVG/Isabelle/dist/">Cambridge
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    45
(UK)</a>
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    46
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    47
<li> <a
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    48
href="ftp://ftp.ci.uminho.pt/pub/mirrors/isabelle/index.html">Minho
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    49
(Portugal)</a>
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    50
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    51
<li> <a
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    52
href="http://www4.informatik.tu-muenchen.de/~isabelle/dist/">Munich
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    53
(Germany)</a>
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    54
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    55
<li> <a
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    56
href="ftp://ftp.research.bell-labs.com/dist/smlnj/isabelle/index.html">New
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    57
Jersey (USA)</a>
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    58
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    59
</ul>
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    60
<p>
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    61
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    62
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    63
<h2>What is  Isabelle?</h2>
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    64
Isabelle can be viewed from two main perspectives.  On the one hand it
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    65
may serve as a generic framework for rapid prototyping of deductive
5803
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    66
systems.  On the other hand, major existing logics like
5791
wenzelm
parents: 5790
diff changeset
    67
<strong>Isabelle/HOL</strong> provide a theorem proving environment
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    68
ready to use for sizable applications.
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    69
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    70
5803
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
    71
<h3>Isabelle's Logics</h3>
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    72
5791
wenzelm
parents: 5790
diff changeset
    73
The Isabelle distribution includes a large body of object logics and
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
    74
other examples (see the <a href="library/">Isabelle theory
5791
wenzelm
parents: 5790
diff changeset
    75
library</a>).
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    76
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    77
<dl>
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    78
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
    79
<dt><a href="library/HOL/"><strong>Isabelle/HOL</strong></a><dd>
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
    80
is a version of classical higher-order logic resembling that of the
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
    81
<A HREF="http://www.cl.cam.ac.uk/Research/HVG/HOL/HOL.html">HOL System</A>.
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    82
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
    83
<dt><a href="library/HOLCF/"><strong>Isabelle/HOLCF</strong></a><dd>
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
    84
adds Scott's Logic for Computable Functions (domain theory) to HOL.
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    85
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
    86
<dt><a href="library/FOL/"><strong>Isabelle/FOL</strong></a><dd>
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
    87
provides basic classical and intuitionistic first-order logic.
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
    88
It is polymorphic.
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    89
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
    90
<dt><a href="library/ZF/"><strong>Isabelle/ZF</strong></a><dd>
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    91
offers a formulation of Zermelo-Fraenkel set theory on top of FOL.
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    92
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    93
</dl>
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    94
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    95
<p>
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    96
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    97
Isabelle/HOL is currently the best developed object logic, including
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    98
an extensive library of (concrete) mathematics, and various packages
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
    99
for advanced definitional concepts (like (co-)inductive sets and
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   100
types, well-founded recursion etc.).  The distribution also includes
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   101
some large applications, for example correctness proofs of
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   102
cryptographic protocols (<a
5803
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
   103
href="library/HOL/Auth/">HOL/Auth</a>) or communication protocols (<a
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
   104
href="library/HOLCF/IOA/">HOLCF/IOA</a>).
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   105
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   106
<p>
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   107
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   108
Isabelle/ZF provides another starting point for applications, with a
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
   109
slightly less developed library.  Its definitional packages
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   110
are similar to those of Isabelle/HOL.  Untyped ZF provides more
5798
wenzelm
parents: 5796
diff changeset
   111
advanced constructions for sets than simply-typed HOL.
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   112
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   113
<p>
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   114
5798
wenzelm
parents: 5796
diff changeset
   115
There are a few minor object logics that may serve as further
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   116
examples: <a
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
   117
href="library/CTT/">CTT</a> is an
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   118
extensional version of Martin-L&ouml;f's Type Theory, <a
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
   119
href="library/Cube/">Cube</a> is
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   120
Barendregt's Lambda Cube.  There are also some sequent calculus
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   121
examples under <a
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
   122
href="library/Sequents/">Sequents</a>,
5798
wenzelm
parents: 5796
diff changeset
   123
including modal and linear logics.  Again see the <a
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
   124
href="library/">Isabelle theory
5792
wenzelm
parents: 5791
diff changeset
   125
library</a> for other examples.
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   126
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   127
5803
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
   128
<h3>Defining Logics</h3>
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   129
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   130
Logics are not hard-wired into Isabelle, but formulated within
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   131
Isabelle's meta logic: <strong>Isabelle/Pure</strong>.  There are
5791
wenzelm
parents: 5790
diff changeset
   132
quite a lot of syntactic and deductive tools available in generic
wenzelm
parents: 5790
diff changeset
   133
Isabelle.  Thus defining new logics or extending existing ones
wenzelm
parents: 5790
diff changeset
   134
basically works as follows:
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   135
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   136
<ol>
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   137
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   138
<li> declare concrete syntax (via mixfix grammar and syntax macros),
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   139
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   140
<li> declare abstract syntax (as higher-order constants),
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   141
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   142
<li> declare inference rules (as meta-logical propositions),
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   143
5800
wenzelm
parents: 5799
diff changeset
   144
<li> instantiate generic automatic proof tools (simplifier, classical
wenzelm
parents: 5799
diff changeset
   145
tableau prover etc.),
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   146
5792
wenzelm
parents: 5791
diff changeset
   147
<li> manually code special proof procedures (via tacticals or
wenzelm
parents: 5791
diff changeset
   148
hand-written ML).
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   149
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   150
</ol>
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   151
5798
wenzelm
parents: 5796
diff changeset
   152
The first three steps above are fully declarative and involve no ML
5791
wenzelm
parents: 5790
diff changeset
   153
programming at all.  Thus one already gets a decent deductive
wenzelm
parents: 5790
diff changeset
   154
environment based on primitive inferences (by employing the built-in
wenzelm
parents: 5790
diff changeset
   155
mechanisms of Isabelle/Pure, in particular higher-order unification
wenzelm
parents: 5790
diff changeset
   156
and resolution).
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   157
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   158
For sizable applications some degree of automated reasoning is
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   159
essential.  Instantiating existing tools like the classical tableau
5791
wenzelm
parents: 5790
diff changeset
   160
prover involves only minimal ML-based setup.  One may also write
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   161
arbitrary proof procedures or even theory extension packages in ML,
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   162
without breaching system soundness (Isabelle follows the well-known
5792
wenzelm
parents: 5791
diff changeset
   163
<em>LCF system approach</em> to achieve a secure system).
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   164
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   165
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
   166
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   167
<h2>Further information</h2>
5803
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
   168
See the local Isabelle pages  at 
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
   169
 <a
5801
d2c97ca3be62 Some streamlining of text.
paulson
parents: 5800
diff changeset
   170
href="http://www.cl.cam.ac.uk/Research/HVG/Isabelle/cambridge.html">Cambridge</a>
5803
06af82bec2f1 made more generic;
mueller
parents: 5801
diff changeset
   171
and <a href="http://www.in.tum.de/~isabelle/munich.html">Munich</a>. 
5795
7ad4d71adfe1 made weblint happy;
wenzelm
parents: 5794
diff changeset
   172
</body>
7ad4d71adfe1 made weblint happy;
wenzelm
parents: 5794
diff changeset
   173
5790
57e3c7775ead main Isabelle page;
wenzelm
parents:
diff changeset
   174
</html>