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%%
%% An UIT Edition example
%%
%% Example 09-17-7 on page 189.
%%
%% 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}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\usepackage{mathtools}
\StopShownPreambleCommands
\begin{document}
\[ \mathop{\mathrm{sgn}}x =
\begin{dcases*}
-1 & $x$ negative \\
\phantom{+} 0 & $x=0$ \\
+1 & $x$ positive
\end{dcases*} \]
\end{document}
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