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+%% 
+%%  Ein Beispiel der DANTE-Edition
+%%  
+%%  2. Auflage
+%% 
+%%  Beispiel 09-07-50 auf Seite 439.
+%% 
+%%  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}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{68}
+\renewcommand\theequation{6.\arabic{equation}}
+%StartShownPreambleCommands
+\usepackage{amsmath}
+%StopShownPreambleCommands
+\begin{document}
+\begin{align}
+\rule[2.5pt]{1cm}{0.2pt} % mathematische Achse
+  \left[ \sum_{\substack{i,j\\i>j}} \frac{1}{2}
+     \dots \right]
+\rule[2.5pt]{1cm}{0.2pt} % mathematische Achse
+\end{align}
+\end{document}