\chapter*{Preface}
\markboth{Preface}{Preface}
This volume is a self-contained introduction to interactive proof
in higher-order logic (HOL), using the proof assistant Isabelle.
It is written for potential users rather
than for our colleagues in the research world.
The book has three parts.
\begin{itemize}
\item
The first part, \textbf{Elementary Techniques},
shows how to model functional programs in higher-order logic. Early
examples involve lists and the natural numbers. Most proofs
are two steps long, consisting of induction on a chosen variable
followed by the \isa{auto} tactic. But even this elementary part
covers such advanced topics as nested and mutual recursion.
\item
The second part, \textbf{Logic and Sets}, presents a collection of
lower-level tactics that you can use to apply rules selectively. It
also describes Isabelle/HOL's treatment of sets, functions and
relations and explains how to define sets inductively. One of the
examples concerns the theory of model checking, and another is drawn
from a classic textbook on formal languages.
\item
The third part, \textbf{Advanced Material}, describes a variety of other
topics. Among these are the real numbers, records and overloading. Advanced
techniques for induction and recursion are described. A whole chapter is
devoted to an extended example: the verification of a security protocol.
\end{itemize}
The typesetting relies on Wenzel's theory presentation tools. An
annotated source file is run, typesetting the theory
in the form of a \LaTeX\ source file. This book is derived almost entirely
from output generated in this way. The final chapter of Part~I explains how
users may produce their own formal documents in a similar fashion.
Isabelle's \hfootref{https://isabelle.in.tum.de/}{web site} contains
links to the download area and to documentation and other information.
The classic Isabelle user interface is Proof~General~/ Emacs by David
Aspinall's\index{Aspinall, David}. This book says very little about
Proof General, which has its own documentation.
This tutorial owes a lot to the constant discussions with and the valuable
feedback from the Isabelle group at Munich: Stefan Berghofer, Olaf
M{\"u}ller, Wolfgang Naraschewski, David von Oheimb, Leonor Prensa Nieto,
Cornelia Pusch, Norbert Schirmer and Martin Strecker. Stephan
Merz was also kind enough to read and comment on a draft version. We
received comments from Stefano Bistarelli, Gergely Buday, John Matthews
and Tanja Vos.
The research has been funded by many sources, including the {\sc dfg} grants
NI~491/2, NI~491/3, NI~491/4, NI~491/6, {\sc bmbf} project Verisoft, the {\sc
epsrc} grants GR/K57381, GR/K77051, GR/M75440, GR/R01156/01 GR/S57198/01 and
by the \textsc{esprit} working groups 21900 and IST-1999-29001 (the
\emph{Types} project).
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