Translations:Digital prediction/91/en

${\begin{aligned}f_{0}{\rm {=1,\ }}f_{1}=a-b,\ f_{2}=\left(a-b\right)a,\ f_{3}=\left(a-b\right)a^{2}{\rm {\ ,\ldots ,\ }}f_{k+\varepsilon }=\left(a-b\right)a^{k+\varepsilon -1},\ldots ,\end{aligned}}$

(141)