Is there a formula to multiply many series (More than two) using the Cauchy product?
If there isn't, please tell me how I can write this formula $ \left( \frac{1}{a-e^x} \right) ^{n+1}$as the bellow form $\sum_{m=0}^{\infty} c_{n,m}\frac{x^m}{m!}$, where $c_{n,m}$ it's a serie.
And thanks a lot.