Formula_6239

\[\left.\begin{array}{c}\boldsymbol{H}=\sum_{s=0}^{\infty} \boldsymbol{H}_{s}(M)(-i \omega)^{-s} \exp [-i \omega(t-\tau(M))], \\\boldsymbol{E}=\sum_{s=0}^{\infty} \boldsymbol{E}_{s}(M)(-i \omega)^{-s} \exp [-i \omega(t-\tau(M))] .\end{array}\right\} .\]