Equation 11.46.11FEE50B8F4491

\begin{equation} \begin{aligned} M(r)& =\int _{|z|^2<r}q\kappa ^ k,& Q(r)& =M(r)^{1/k},\\ U'(r)& =\frac{Q(r)-P(r)}r,& U(\infty )& =0. \end{aligned} \end{equation}