Formula_19881

\[\begin{gathered}\Delta p=0 \text { в } D_{(t)} \backslash \cup\left\{z_{k}\right\}, 0 \leqslant t \leqslant T, \\p=0 \text { и } \partial p / \partial t-|\nabla p|^{2}=0 \text { на } \gamma_{t}, 0 \leqslant t \leqslant T .\end{gathered}\]