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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}
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