\subsection{08\_1 Determinanten von $2\times 2$-Matrizen}
\begin{itemize}
  \item Berechnung:
$
\begin{array}{*{20}l}
   {A = \left( {\begin{array}{*{20}c}
   {a_{11} } & {a_{12} }  \\
   {a_{21} } & {a_{22} }  \\
\end{array}} \right)}  \\
\\
   {\det (A) = a_{11} a_{22}  - a_{12} a_{21} }  \\
\end{array}$

\item Schema:  \includegraphics{08_1_2}
\end{itemize}