TeX Quellcode:
\begin{array}{rclcl} \mathbb{D} &=& \mathbb{R} \cr \cr 2x^2 &>& -8+7x & \vert & -7x+8 \cr 2x^2-7x+8 &>& 0 & \vert & :2 \cr x^2-\dfrac{7}{2}x+4 &>& 0 \end{array}