Źródło TeX:

x_\tau\left(t\right)=\left\{\begin{matrix}x\left(t\right),\begin{matrix}&t\in\left[\tau-\varepsilon,\tau+\varepsilon\right)\\\end{matrix}\\0\begin{matrix}&\\\end{matrix}\mathrm{dla}\ \buildrel\over{}\mathrm{pozostalych}\ \\\end{matrix}\right.