Equation 18.6.2CE9BB18A9158

\begin{equation} d_{\mathcal I,\theta ,\mathrm{d}V}([u]_{\mathcal I},[v]_{\mathcal I}) =\int _ X|P_\theta [u]_{\mathcal I}-P_\theta [v]_{\mathcal I}|\, \mathrm{d}V \end{equation}