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\title{AVL Trees}
\author{Tobias Nipkow and Cornelia Pusch}
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\begin{abstract}
  Two formalizations of AVL trees with room for extensions.  The first
  formalization is monolithic and shorter, the second one in two
  stages, longer and a bit simpler. The final implementation is the
  same.  If you are interested in developing this further, please
  contact \url{<gerwin.klein@nicta.com.au>}.
\end{abstract}

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