which is the integral for exp( -a/x ) dx ?
i have tried every method
thanks
Topsquark is correct.
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It is a famous case that,
is non-elementary.
We shall convert this integral into this form.
For simplicity sake we shall use , thus,
Manipulate it as,
Let, (going to apply the substitution rule)
then,
Thus,
If you use integration by parts with,
and
Then,
We have converted this integral into an integral which has no elementary anti-derivative. This confirms topsquarks guess.