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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%% 2. Auflage
+%%
+%% Beispiel 09-08-12 auf Seite 454.
+%%
+%% 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{217.16928pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\setcounter{equation}{0}
+\renewcommand\theequation{9.\arabic{equation}}
+%StartShownPreambleCommands
+\usepackage{amsmath}
+\usepackage{cases}
+\DeclareMathOperator{\sgn}{sgn}
+%StopShownPreambleCommands
+\begin{document}
+\begin{numcases}{\sgn{x}=}
+ -1, & for $x < 0$\\
+ 0, & for $x = 0$\\
+ 1, & for $x > 0$
+\end{numcases}
+\end{document}