Equation 3.1.159448EDDC2E41

\begin{equation} \Delta F(|x|)=F''(|x|)+\frac{d-1}{|x|}F'(|x|)=|x|^{1-d}\, \frac{\mathrm d}{\mathrm dt}\bigl (t^{d-1}F'(t)\bigr )\Big|_{t=|x|}. \end{equation}