%%
%% An UIT Edition example
%%
%% Example 04-05-1 on page 38.
%%
%% Copyright (C) 2010 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{201.70511pt}
\usepackage[utf8]{inputenc}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\StopShownPreambleCommands
\begin{document}
\[ \mathrm{sgn}(x)=\left\{
\begin{array}{rl}
-1 & \textrm{for } x<1 \\
0 & \textrm{for } x=0 \\
1 & \textrm{for } x>1
\end{array} \right. \]
\end{document}
