Translations:Synthetic seismogram with multiples/21/en

${\begin{aligned}E\left(Z\right)={\varepsilon }_{1}Z+{\varepsilon }_{2}Z^{2}+\dots +{\varepsilon }_{N}Z^{N}\mathrm {\ and\ } G\left(Z\right)={1}+g_{1}Z+g_{2}Z^{2}+\dots +g_{N}Z^{N}.\end{aligned}}$

(28)