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%%  An UIT Edition example
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%%  Example 05-03-2 on page 74.
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%%  Copyright (C) 2010 Herbert Voss
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%%  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.
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%%  See http://www.latex-project.org/lppl.txt for details.
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{xcolor}
\StopShownPreambleCommands
\begin{document}
\colorbox{yellow}{$x_{n+1}\leftarrow x_n^2+c$}
seen in the set of complex numbers,
related to Beno\^it Mandelbrot.
\end{document}