1 problem

Let $\mathcal{X}=(\{v\leq 0\}\cup \{t\leq -0.9\})\cap\{-1\leq u<0\}$ and let $\mathcal{C}$ be the backward light cone. The symbols $\phi$, $r$, $\nu$, $d$, $p$, and $k$ have the me…