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+\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{http://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).