doc-src/Intro/intro.tex
author lcp
Fri Dec 03 17:45:19 1993 +0100 (1993-12-03)
changeset 184 236b655114a1
parent 105 216d6ed87399
child 296 e1f6cd9f682e
permissions -rw-r--r--
Changed Acknowledgements
     1 \documentstyle[a4,12pt,proof,iman,alltt]{article}
     2 %% $Id$
     3 %% run    bibtex intro         to prepare bibliography
     4 %% run    ../sedindex intro    to prepare index file
     5 %prth *(\(.*\));          \1;      
     6 %{\\out \(.*\)}          {\\out val it = "\1" : thm}
     7 
     8 \title{Introduction to Isabelle}   
     9 \author{{\em Lawrence C. Paulson}\\
    10         Computer Laboratory \\ University of Cambridge \\[2ex]
    11         {\small{\em Electronic mail\/}: {\tt lcp@cl.cam.ac.uk}}
    12 }
    13 \date{} 
    14 \makeindex
    15 
    16 \underscoreoff
    17 
    18 \setcounter{secnumdepth}{2} \setcounter{tocdepth}{2}
    19 
    20 \sloppy
    21 \binperiod     %%%treat . like a binary operator
    22 
    23 \newcommand\qeq{\stackrel{?}{\equiv}}  %for disagreement pairs in unification
    24 \newcommand{\nand}{\mathbin{\lnot\&}} 
    25 \newcommand{\xor}{\mathbin{\#}}
    26 
    27 \pagenumbering{roman} 
    28 \begin{document}
    29 \pagestyle{empty}
    30 \begin{titlepage}
    31 \maketitle 
    32 \thispagestyle{empty}
    33 \vfill
    34 {\small Copyright \copyright{} \number\year{} by Lawrence C. Paulson}
    35 \end{titlepage}
    36 
    37 \pagestyle{headings}
    38 \part*{Preface}
    39 \index{Isabelle!overview}
    40 \index{Isabelle!object-logics supported}
    41 Isabelle~\cite{paulson86,paulson89,paulson700} is a generic theorem prover.
    42 It has been instantiated to support reasoning in several object-logics:
    43 \begin{itemize}
    44 \item first-order logic, constructive and classical versions
    45 \item higher-order logic, similar to that of Gordon's {\sc
    46 hol}~\cite{gordon88a}
    47 \item Zermelo-Fraenkel set theory~\cite{suppes72}
    48 \item an extensional version of Martin-L\"of's Type Theory~\cite{nordstrom90}
    49 \item the classical first-order sequent calculus, {\sc lk}
    50 \item the modal logics $T$, $S4$, and $S43$
    51 \item the Logic for Computable Functions~\cite{paulson87}
    52 \end{itemize}
    53 A logic's syntax and inference rules are specified declaratively; this
    54 allows single-step proof construction.  Isabelle provides control
    55 structures for expressing search procedures.  Isabelle also provides
    56 several generic tools, such as simplifiers and classical theorem provers,
    57 which can be applied to object-logics.
    58 
    59 \index{ML}
    60 Isabelle is a large system, but beginners can get by with a small
    61 repertoire of commands and a basic knowledge of how Isabelle works.  Some
    62 knowledge of Standard~\ML{} is essential, because \ML{} is Isabelle's user
    63 interface.  Advanced Isabelle theorem proving can involve writing \ML{}
    64 code, possibly with Isabelle's sources at hand.  My book
    65 on~\ML{}~\cite{paulson91} covers much material connected with Isabelle,
    66 including a simple theorem prover.  Users must be familiar with logic as
    67 used in computer science; there are many good
    68 texts~\cite{galton90,reeves90}.
    69 
    70 \index{LCF}
    71 {\sc lcf}, developed by Robin Milner and colleagues~\cite{gordon79}, is an
    72 ancestor of {\sc hol}, Nuprl, and several other systems.  Isabelle borrows
    73 ideas from {\sc lcf}: formulae are~\ML{} values; theorems belong to an
    74 abstract type; tactics and tacticals support backward proof.  But {\sc lcf}
    75 represents object-level rules by functions, while Isabelle represents them
    76 by terms.  You may find my other writings~\cite{paulson87,paulson-handbook}
    77 helpful in understanding the relationship between {\sc lcf} and Isabelle.
    78 
    79 Isabelle does not keep a record of inference steps.  Each step is checked
    80 at run time to ensure that theorems can only be constructed by applying
    81 inference rules.  An Isabelle proof typically involves hundreds of
    82 primitive inferences, and would be unintelligible if displayed.
    83 Discarding proofs saves vast amounts of storage.  But can Isabelle be
    84 trusted?  If desired, object-logics can be formalized such that each
    85 theorem carries a proof term, which could be checked by another program.
    86 Proofs can also be traced.
    87 
    88 \index{Isabelle!release history} Isabelle was first distributed in 1986.
    89 The 1987 version introduced a higher-order meta-logic with an improved
    90 treatment of quantifiers.  The 1988 version added limited polymorphism and
    91 support for natural deduction.  The 1989 version included a parser and
    92 pretty printer generator.  The 1992 version introduced type classes, to
    93 support many-sorted and higher-order logics.  The current version provides
    94 greater support for theories and is much faster.  Isabelle is still under
    95 development and will continue to change.
    96 
    97 \subsubsection*{Overview} 
    98 This manual consists of three parts.  
    99 Part~I discusses the Isabelle's foundations.
   100 Part~II, presents simple on-line sessions, starting with forward proof.
   101 It also covers basic tactics and tacticals, and some commands for invoking
   102 Part~III contains further examples for users with a bit of experience.
   103 It explains how to derive rules define theories, and concludes with an
   104 extended example: a Prolog interpreter.
   105 
   106 Isabelle's Reference Manual and Object-Logics manual contain more details.
   107 They assume familiarity with the concepts presented here.
   108 
   109 
   110 \subsubsection*{Acknowledgements} 
   111 Tobias Nipkow contributed most of the section on ``Defining Theories''.
   112 Sara Kalvala and Markus Wenzel suggested improvements.
   113 
   114 Tobias Nipkow has made immense contributions to Isabelle, including the
   115 parser generator, type classes, and the simplifier.  Carsten Clasohm and
   116 Markus Wenzel made major contributions; Sonia Mahjoub and Karin Nimmermann
   117 also helped.  Isabelle was developed using Dave Matthews's Standard~{\sc
   118   ml} compiler, Poly/{\sc ml}.  Many people have contributed to Isabelle's
   119 standard object-logics, including Martin Coen, Philippe de Groote, Philippe
   120 No\"el.  The research has been funded by the SERC (grants GR/G53279,
   121 GR/H40570) and by ESPRIT (projects 3245: Logical Frameworks, and 6453:
   122 Types).
   123 
   124 \newpage
   125 \pagestyle{plain} \tableofcontents 
   126 \newpage
   127 
   128 \newfont{\sanssi}{cmssi12}
   129 \vspace*{2.5cm}
   130 \begin{quote}
   131 \raggedleft
   132 {\sanssi
   133 You can only find truth with logic\\
   134 if you have already found truth without it.}\\
   135 \bigskip
   136 
   137 G.K. Chesterton, {\em The Man who was Orthodox}
   138 \end{quote}
   139 
   140 \clearfirst  \pagestyle{headings}
   141 \include{foundations}
   142 \include{getting}
   143 \include{advanced}
   144 
   145 
   146 \bibliographystyle{plain} \small\raggedright\frenchspacing
   147 \bibliography{atp,funprog,general,logicprog,theory}
   148 
   149 \input{intro.ind}
   150 \end{document}