Master/texmf-dist/doc/latex/einfuehrung/09-08-39.ltx


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%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  1. Auflage
%% 
%%  Beispiel 09-08-39 auf Seite 490.
%% 
%%  Copyright (C) 2011 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{190.324pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\usepackage{mathtools}
\StopShownPreambleCommands
\begin{document}
\[ \mathop{\mathrm{sgn}}x =
   \begin{dcases*}
                -1  & $x$ negativ \\
     \phantom{+} 0  & $x=0$ \\
                +1  & $x$ positiv
 \end{dcases*} \]
\end{document}