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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example 8-2-28 on page 484.
+%%
+%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
+%% Johannes Braams, David Carlisle, and Chris Rowley
+%%
+%% 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.
+%%
+
+\documentclass{ttctexamargin}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{183.0pt}
+
+\StartShownPreambleCommands
+\usepackage[leqno]{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{gather} \raisetag{-10pt}
+ \text{The sign function: \ }
+ \mathcal{S}(x) = \begin{cases}
+ -1 & x < 0 \\
+ 0 & x = 0 \\
+ 1 & x > 0
+ \end{cases}
+\end{gather}
+\end{document}