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+%%
+%% An UIT Edition example
+%%
+%% Example 04-18-11 on page 68.
+%%
+%% 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{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\let\itemOld\item\makeatletter
+\renewcommand\item[1][]{\def\@tempa{#1}%
+ \ifx\@tempa\@empty\itemOld\else\boldmath\itemOld[#1]\unboldmath\fi}
+\newcommand\Section[2][]{\def\@tempa{#1}
+ \protect\boldmath\ifx\@tempa\@empty\section[#2]{#2}\else
+ \section[#1]{#2}\fi\protect\unboldmath} \makeatother
+\StopShownPreambleCommands
+\begin{document}
+\Section{Function $f(x)=x^2$}
+\begin{description}
+ \item[This is $y=f(x)$] only a demonstration.
+ \item[And $z=f(x,y)$] another demonstration.
+\end{description}
+\end{document}