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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}