Formula_20449

\[\left.\begin{array}{l}V(q) U(p)=e^{i p q} U(p) V(q), \\U\left(p_{1}\right) U\left(p_{2}\right)=U\left(p_{1}+p_{2}\right), \\V\left(q_{1}\right) V\left(q_{2}\right)=V\left(q_{1}+q_{2}\right) .\end{array}\right\}\]