- #1
roadworx
- 21
- 0
Hi,
I have [tex]\sum_{j=\kappa}^{\inf} \varphi^{2j-\kappa}\sigma^2[/tex]
I know the answer is [tex] = \frac{\sigma^2}{1-\sigma^2} \varphi^\kappa [/tex]
Can someone explain the mathematics involved in this derivation?
Thanks.
I have [tex]\sum_{j=\kappa}^{\inf} \varphi^{2j-\kappa}\sigma^2[/tex]
I know the answer is [tex] = \frac{\sigma^2}{1-\sigma^2} \varphi^\kappa [/tex]
Can someone explain the mathematics involved in this derivation?
Thanks.