It is well-known that $e^{-1/x}sim o(x^n)$ as $xto 0^+$ for any $ninmathbb{N}$, thus if I do an asymptotic expansion for a function, say $f=1/(1-x)+e^{-1/x}$ as $xto 0^+$, I expect to receive an answer like $fsim 1+x + x^2+o(x^2)$. Nevertheless both * Asymptotic* and

*give me results including $e^{-1/x}$, see*

**Series**In(1):= Asymptotic(1/(1 – x) + E^(-1/x), {x, 0, 2})

Out(1):= 1 + E^(-1/x) + x + x^2

In(2):= Series(1/(1 – x) + E^(-1/x), {x, 0, 2})

Out(2):= E^-(1/x)+O(x)^3+(1+x+x^2+O(x)^3)

My question is how to remove $e^{-1/x}$ in practice.

Thanks in advance!