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\title{Efficient Mergesort}
\author{Christian Sternagel}
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\begin{abstract}
We provide a formalization of the mergesort algorithm as used in GHC's Data.List module, proving correctness and stability. Furthermore, experimental data suggests that generated (Haskell-)code for this algorithm is much faster than for previous algorithms available in the Isabelle distribution.
\end{abstract}

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