Formula_5764

\[\begin{gathered}i L f=\{H, f\}, \\\left.\{H, f\}=\sum_{k=1}^{N}\left(\frac{\partial H}{\partial \vec{q}_{k}} \frac{\partial f}{\partial \vec{p}_{k}}-\frac{\partial H}{\partial \vec{p}_{k}} \frac{\partial f}{\partial \vec{q}_{k}}\right)\right\},\end{gathered}\]