TeX Quellcode:

\begin{array}{rclcl} \mathbb{D} &=& \mathbb{R} \cr\cr 26^x &=& 15 &\vert& \ln() \cr \ln(26^x) &=& \ln(15) &\vert& \text{3. Logarithmengesetz} \cr x \cdot \ln(26) &=& \ln(15) &\vert& :\ln(26) \cr x &=& \dfrac{\ln(15)}{\ln(26)} \approx 0{,}83 \cr\cr \mathbb{L} &=& \left\{\dfrac{\ln(15)}{\ln(26)}\right\} \end{array}