Integration is the reverse operation of derivation.
The Integral of a function is the area under the function's graph.
When
When and
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When
When ,
and
when
When , , ,
When f(x) is continuous there is a point so
The Gamma function is convergent for x>0.
G(x+1) = xG(x)
G(n+1) = n! , when nℕ (positive integer).