TeX Quellcode:
f\cdot\vec{a}=f\cdot\left(\begin{array}{c} x_1 \\ y_1 \\ z_1 \end{array}\right)=\left(\begin{array}{c} f\cdot x_1 \\ f\cdot y_1 \\ f\cdot z_1 \end{array}\right)=\left(\begin{array}{c} x_2 \\ y_2 \\ z_2 \end{array}\right)=\vec{b}