Ich hab da mal was gebastelt. Sicherlich noch verbesserungswürdig, sieht der Vorlage aber schon mal ähnlich:
Code:
\documentclass[
paper=a4,
twoside=false,
fontsize=11pt,
parskip=false,
]{scrartcl}
\usepackage{selinput}
\SelectInputMappings{adieresis={ä}, germandbls={ß},Euro={€}}
\usepackage[T1]{fontenc}
\usepackage[ngerman,]{babel}
\usepackage{microtype}
\usepackage{lmodern}
\usepackage{amsmath}
\title{}
\author{}
\begin{document}
\begin{equation}
n\Bigg\{k\cdot\underbrace{\left(%
\begin{array}{cccc}
\vdots\\
\beta_{k1} & \beta_{k2} & \cdots & \beta_{kn}\\
\vdots
\end{array}\right)}_m
\underbrace{\overset{i}{\left(%
\begin{array}{ccc}
\hline
\cdots & \alpha_{1i} & \cdots\\
& \alpha_{2i} & \\
& \vdots & \\
& \alpha_{mi} &
\end{array}\right)}}_l\Bigg\}m
=
k\cdot\underbrace{\overset{i}{\left(%
\begin{array}{ccc}
\hline
& \vdots & \\
\cdots & \gamma_{ki} & \cdots\\
& \vdots &
\end{array}\right)}}_l\Bigg\}n\notag
\end{equation}
\begin{equation}
B' = \raisebox{6ex}{$s\Bigg\{$}\left(
\begin{array}{c|c|c}
\begin{array}{ccc}
1 & \cdots & 0\\
\vdots & \ddots & \vdots\\
0 & \cdots & 1
\end{array} & & \phantom{\begin{array}{ccc}1 & \cdots & 0\end{array}}\\
\hline
\begin{array}{ccc}
0 & \cdots & 0\\
\vdots & \ddots & \vdots\\
0 & \cdots & 0
\end{array} & \begin{array}{c}
*\\
\vdots\\
*
\end{array}& \\
\multicolumn{1}{c}{\underbrace{\phantom{\begin{array}{ccc}1 & \cdots & 0\end{array}}}_s}
\end{array}\right)
\notag
\end{equation}
\end{document}
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