Equation 9.7.6D986C1B2DB45

\begin{align} \mathcal I_ W\mathcal O_{M'}& =\mathcal O_{M'}(-H)\mathcal I_{W'}, \\ \mathfrak a\mathcal O_{M'}& =\mathcal O_{M'}(-H-H'), \tag{9.7.7}\\ (\mathfrak a\mathcal O_ W)\mathcal O_{W'} & =\mathcal O_{W'}(-H|_{W'}). \tag{9.7.8} \end{align}