Equation 11.1.90B024E0A2A47

\begin{equation} \left.\frac{\mathrm{d}}{\mathrm{d}t}\right|_{t=0}\mathrm M_\omega (u+tv) =n\int _ X v\mathrm{dd}^{\mathrm{c}}(\omega _ u^{n-1}). \end{equation}