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\title{\includegraphics[scale=0.5]{isabelle_logo}
\\[4ex] Haskell-style type classes with Isabelle/Isar}
\author{\emph{Florian Haftmann}}
\begin{document}
\maketitle
\begin{abstract}
\noindent This tutorial introduces Isar type classes, which
are a convenient mechanism for organizing specifications.
Essentially, they combine an operational aspect (in the
manner of Haskell) with a logical aspect, both managed uniformly.
\end{abstract}
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