Translations:Causality and stability of digital systems/39/en

${\begin{aligned}h_{k}=A_{1}a_{1}^{k}+A_{2}a_{2}^{k}+\ldots -+A_{p}a_{p}^{k}\mathrm {\;\;\;for\;\;\;} k=0,1,2,\ldots ,\end{aligned}}$

(61)