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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}