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-\documentclass[a4paper,12pt]{report}
-\usepackage[latin1]{inputenc}
-\usepackage{german,deleq}
-\begin{document}
-
-Mit den Definitionen
-\begin{deqarr}
- \mathbf{X} &=& (x_1,\dots,x_n)\\
- \mathbf{Y} &=& (y_1,\dots,y_n)
-\end{deqarr}
-sowie
-\begin{ddeqn}
- \mathbf{A} = \left( \begin{array}{ccc}
- a_{11} & \cdots & a_{1n}\\ \vdots & \ddots & \vdots\\
- a_{n1} & \cdots & a_{nn}\end{array}\right)
-\end{ddeqn}
-können wir das Gleichungssystem
-\begin{equation}
- \mathbf{Y} = \mathbf{A}\mathbf{X}
-\end{equation}
-als
-\begin{ddeqar}
- y_1 &=& a_{11}x_1 + a_{12}x_2 + \dots +a_{1n}x_n \\
- &\vdots& \nonumber \\
- \setcounter{deleq}{14}
- y_n &=& a_{n1}x_1 + a_{n2}x_2 + \dots +a_{nn}x_n \\
- \rem{oder mit}\heqno
- \sum_{i=1}^n a_i &:=& a_1+a_2+\cdots+a_n\\
- \rem{als}\nydeqno
- y_1 &=& \sum_i^n a_{1i}x_i \arrlabel{summe}\\
- &\vdots& \nonumber \\
- \setcounter{deleq}{14}
- y_n &=& \sum_i^n a_{ni}x_i
-\end{ddeqar}
-schreiben. Die Gleichungen (\ref{summe}) benutzen dabei
-das sog. Summenzeichen $\sum$.
-
-\end{document} \ No newline at end of file