Formula_19932

\[\begin{gathered}\partial \chi(t, w) / \partial t=v(\partial \chi / \partial w, \Delta w)- \\-i \sum_{j=1}^{3}\left(\partial^{2} \chi / \partial w^{j}(\cdot) \delta w(\cdot), \partial w(\cdot) / \partial x^{j}\right)+i(w, f(t, \cdot)) \chi(t, w) .\end{gathered}\]