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%%
%% Ein Beispiel der DANTE-Edition
%%
%% 2. Auflage
%%
%% Beispiel 09-07-39 auf Seite 434.
%%
%% Copyright (C) 2016 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{352.81416pt}
\AtBeginDocument{\setlength\parindent{0pt}
\setcounter{equation}{55}
\renewcommand\theequation{9-\arabic{equation}-}}
\usepackage{blkarray}
\newcommand\bigstrutht{\vrule width0pt height 12pt depth0pt\relax}
\newcommand\bigstrutdp{\vrule width0pt height 0pt depth5pt\relax}
%StartShownPreambleCommands
\usepackage{amsmath,blkarray}
\renewcommand\theequation{\thesection-\arabic{equation}-}
%StopShownPreambleCommands
\begin{document}
\begin{align}\begin{blockarray}{*{4}{c}}
\begin{block}{[ccc]c}
\bigstrutht 1-\lambda x & 0 & 0 & \ell_1 \\ 0 & 1-\lambda x & 0 & \ell_2 \\
\bigstrutdp 0 & 0 & 1-\lambda x & \ell_3 \\
\end{block}
c_1 & c_2 & c_3
\end{blockarray}\end{align}
\end{document}
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