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\title{%A Compact Introduction to
Structured Proofs in Isar/HOL\thanks{Published in TYPES 2002, LNCS 2646.}}
\author{Tobias Nipkow}
\institute{Institut f{\"u}r Informatik, TU M{\"u}nchen\\
 {\small\url{http://www.in.tum.de/~nipkow/}}}
\date{}
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\begin{abstract}
  Isar is an extension of the theorem prover Isabelle with a language
  for writing human-readable structured proofs. This paper is an
  introduction to the basic constructs of this language.
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\paragraph{Acknowledgement}
I am deeply indebted to Markus Wenzel for conceiving Isar. Clemens Ballarin,
Gertrud Bauer, Stefan Berghofer, Gerwin Klein, Norbert Schirmer,
Markus Wenzel and Freek Wiedijk commented on and improved this paper.

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