2 problems

Let $U_T$ be the spacetime domain, let $U_{(x,t)}$ be the backwards light cone of $(x,t)\in U_T$, and let $\widetilde{Q}$ be the spatial operator in the relativistic heat equation.…

Let $U_T$ be the spacetime domain, let $U_{(x,t)}$ denote the backwards light cone … and let $\widetilde{Q}$ be the spatial operator in the relativistic heat equation. Strong maxim…