The Incomplete Gamma Function

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saeddawoud

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incomplete gamma function c++

Hello everybody:

I am reading a paper, which contains equations with incopmlete gamma functions, and one of them expressed as the following:

\[\Gamma\left(c,\,d \frac{x+e}{x-y}\right)= (c-1)!\, exp(-d)\, exp\left[-d\frac{y+e}{x-y}\right]\, \sum_{k=0}^{c-1}\,\sum_{l=0}^{k}\frac{d^k}{k!} {k \choose l} \left(\frac{y+e}{x-y}\right)^l\]

How did they get this result?
 

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