Źródło TeX:

\left[\begin{matrix}I_1\\I_2\\\end{matrix}\right]=\left[\begin{matrix}Y_{11}&Y_{12}\\Y_{21}&Y_{22}\\\end{matrix}\right]\left[\begin{matrix}U_1\\U_2\\\end{matrix}\right]=\mathbf{Y}\left[\begin{matrix}U_1\\U_2\\\end{matrix}\right]