The exponential sum function , sometimes also denoted , is defined by
(1)
| |||
(2)
|
where is the upper incomplete gamma function and is the (complete) gamma function.
The exponential sum function , sometimes also denoted , is defined by
(1)
| |||
(2)
|
where is the upper incomplete gamma function and is the (complete) gamma function.
Weisstein, Eric W. "Exponential Sum Function." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ExponentialSumFunction.html