Zdroj TeX:

\small (\begin{array}{} x' & y' \end{array} )=\left( \begin{array}{} x & y \end{array} \right) ·\left( \begin{array}{} 0 & 1 \\ -1 & 0 \\ \end{array} \right)+\left( \begin{array}{} 0 & 0\end{array} \right),