Who is the father of calculus?
History of calculus
{'answer_start': array([-1]), 'answer_text': array([''], dtype=object)}





∫

0


∞



e

−
x



x

n
−
1


d
x
=
(
n
−
1
)
!
,


{\displaystyle \int _{0}^{\infty }e^{-x}x^{n-1}dx=(n-1)!,}

