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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%% 2. Auflage
+%%
+%% Beispiel 09-03-1 auf Seite 382.
+%%
+%% Copyright (C) 2016 Herbert Voss
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+%%
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{169.16928pt}
+\setlength\parindent{0pt}
+%StartShownPreambleCommands
+
+%StopShownPreambleCommands
+\begin{document}
+\[
+ f(x)=\prod_{i=1}^{n}\left(i-\frac{1}{2i}\right)
+\]
+\begin{displaymath}
+1+2+3+\cdots+n=\sum_{i=1}^n i=\frac{n(n+1)}{2}
+\end{displaymath}
+\end{document}