%% 
%%  Der Mathematiksatz mit LaTeX, 1. Auflage 2009
%% 
%%  Example 2-2-8 on page 10.
%% 
%%  Copyright (C) 2009 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.
%% 

\documentclass[]{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{355.65944pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{xcolor}
\StopShownPreambleCommands
\begin{document}
{ \setlength\fboxsep{10pt}%
  \colorbox{yellow}{$f(x)=\prod_{i=1}^{n}\left(i-\frac{1}{2i} \right)$} } und
{ \setlength\fboxrule{1.5pt}%
  \colorbox{cyan}{$f(x)=\prod_{i=1}^{n}\left(i-\frac{1}{2i} \right)$} }
\end{document}
