Equation 18.16.3F57341993FE4

\begin{equation} \begin{aligned} P_{\gamma ,F}[u] & =\sum _ i P_{\sigma _ i,F_ i}[u_ i]\circ \pi _ i,\\ P_{\gamma ,F}[u]_{\mathcal I} & =\sum _ i P_{\sigma _ i,F_ i}[u_ i]_{\mathcal I}\circ \pi _ i. \end{aligned} \end{equation}