Equation 9.11.42EFA25DCE0A09

\begin{equation} \begin{gathered} c_ b=\frac dM=\frac1{nI},\qquad R(s)=\left(c_ bn\int _0^1 k(sr)r^{n-1}\, \mathrm{d} r\right)^{1/n},\\ Q'(s)=\frac{R(s)-1}{1-s},\qquad Q(1)=0. \end{gathered} \end{equation}