In the case of the exponential function, the answer is negative. It turns out that, for _every_ $x\in\mathbb R$, $e^x=\sum_{n=0}^\infty\frac{x^n}{n!}$.
In the case of the exponential function, the answer is negative. It turns out that, for _every_ $x\in\mathbb R$, $e^x=\sum_{n=0}^\infty\frac{x^n}{n!}$.