TeX Quellcode:

\begin{array}{rclcl} \mathbb{D} &=& \mathbb{R} \cr \cr \dfrac{x^2}{2}-3x &>& 56 & \vert & \cdot 2 \cr x^2-6x &>& 112 & \vert & -112 \cr x^2-6x-112 &>& 0\end{array}