Equation 10.2.30947422F7E16

\begin{equation} \int _{\mathbb R^{2n}}(1+|\xi |^2)^ r|\widehat v(\xi )|^2\, \mathrm d\xi =\sum _{|\beta |\leq r}c_\beta (2\pi )^{-2|\beta |}\| \partial ^\beta v\| _{L^2}^2, \end{equation}