Formula_12823

\[\begin{gathered}F_{s}^{(N)}\left(x_{1}, p_{1} ; \ldots ; x_{s}, p_{s}\right)= \\=\frac{N !}{(N-s) !} \int d \Gamma_{N-s} f_{N}\left(t, x_{1}, p_{1} ; \ldots ; x_{N}, p_{N}\right), \quad 1 \leqslant s \leqslant N,\end{gathered}\]