Equation 20.3.4509D69C0F18B7

\begin{equation} \operatorname {ord}_ D(\mathfrak b\mathcal O_ Z) =e\operatorname {ord}_ F(\mathfrak b\mathcal O_{M'}), \qquad \nu (w\circ f,D)=e\nu (w\circ \sigma ,F) \end{equation}