Latex template
$\newcommand{\eps}{\varepsilon}$
$\newcommand{\Real}{\mathbb{R}}$
$\newcommand{\ra}{\rightarrow}$
$\newcommand{\abs}[1]{\left\vert#1\right\vert}$
$\newcommand{\norm}[1]{\left\Vert#1\right\Vert}$
$\newcommand{\set}[1]{\left\{#1\right\}}$