lol seems like it's a bit broken
\[
\mathrm{Let\ }G=\left\lt V,E\right\gt \ \mathrm{be\ a\ digraph}, c\in\mathbb{R}^{|V|}_{+}, r\in V\\ \begin{align*}\mathrm{min}\ &c^\top x\\ \mathrm{subject\ to}\\&\sum_{uv\ \in\ E}x_{uv}=1\ \forall\ v\in V\setminus\left\{r\right\}\\&x\geq0\ \mathrm{integer}\end{align*}
\]
views are my own