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%%
%% Ein Beispiel der DANTE-Edition
%%
%%
%% 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.
%%
%%
%%Run also: >> <<
% Show page(s) 1
%%
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
%
\newsavebox\MBox
\newlength\MBoxht
\newcommand\FBox[2][Beispiel]{%
\sbox\MBox{#2}%
\setlength\MBoxht{\ht\MBox}%
\setlength\fboxsep{6pt}%
\addtolength\MBoxht{\fboxsep}%
\addtolength\MBoxht{\baselineskip}%
\fcolorbox{blue}{yellow!50}{\usebox\MBox}%
\hspace*{-\wd\MBox}%
\raisebox{1.5\ht\MBox}{%
\makebox[\wd\MBox]{%
\fboxsep=3pt\colorbox{blue}{\color{white}#1}}}}
\usepackage{amsmath,empheq,xcolor}% \FBox->Praeambel
\begin{document}
\begin{empheq}[{box=\FBox[Ein Beispiel]}]{alignat=3}
abc &= xxx &&= xxxxxxxxxxxx &&= aaaaaaaaa \\
ab &= yyyyyyyyyyyyyyy &&= yyyy &&= ab
\end{empheq}
\end{document}
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