Formula_6240

\[\left.\begin{array}{l}\varepsilon \boldsymbol{E}_{s}+\left[\operatorname{grad} \tau, \boldsymbol{H}_{s}\right]=\operatorname{rot} \boldsymbol{H}_{s-1}, \\-\mu \boldsymbol{H}_{s}+\left[\operatorname{grad} \tau, \boldsymbol{E}_{s}\right]=\operatorname{rot} \boldsymbol{E}_{s-1}, s \geqslant 0, \quad \boldsymbol{E}_{-1}=\boldsymbol{H}_{-1} \equiv 0,\end{array}\right\}\]