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% https://www.namsu.de/Extra/pakete/Acronym.html

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% Symbols
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% The symbols should sorted by their labels
\begin{acronym}[$\sigma$] % Longest symbol here, for adjustment
    \acro{pi}[$\Pi$]{Projection}
    \acro{join}[$\Join$]{Natural Join}
    \acro{selection}[$\sigma$]{Selection}
\end{acronym}