TeX Quellcode:

\begin{array}{rclcl} \mathbb{D} &=& \mathbb{R} \cr\cr 5^{2t}-16\cdot 5^t &=& 0 &\vert& \text{3. Potenzgesetz} \cr \left(5^t\right)^2-16\cdot 5^t &=& 0 \end{array}