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Incomplete gamma function : ウィキペディア英語版
Incomplete gamma function

In mathematics, the upper incomplete gamma function and lower incomplete gamma function are types of special functions, which arise as solutions to various mathematical problems such as certain integrals.
Their respective names stem from their integral definitions, which are defined similarly to the gamma function, another type of special function, but with different or "incomplete" integral limits. The gamma function is defined as an integral from zero to infinity. This contrasts with the lower incomplete gamma function, which is defined as an integral from zero to a variable upper limit. Similarly, the upper incomplete gamma function is defined as an integral from a variable lower limit to infinity.
==Definition==
The upper incomplete gamma function is defined as:
: \Gamma(s,x) = \int_x^ t^\,e^\,t ,\,\!
whereas the lower incomplete gamma function is defined as:
: \gamma(s,x) = \int_0^x t^\,e^\,t .\,\!

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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