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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}
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