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 GammaRegularized

 http://functions.wolfram.com/06.08.07.0001.01

 Input Form

 GammaRegularized[a, z] == (1/Gamma[a]) Integrate[t^(a - 1)/E^t, {t, z, Infinity}]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["GammaRegularized", "[", RowBox[List["a", ",", "z"]], "]"]], "\[Equal]", RowBox[List[FractionBox["1", RowBox[List["Gamma", "[", "a", "]"]]], RowBox[List[SubsuperscriptBox["\[Integral]", "z", "\[Infinity]"], RowBox[List[RowBox[List[SuperscriptBox["t", RowBox[List["a", "-", "1"]]], " ", SuperscriptBox["\[ExponentialE]", RowBox[List["-", "t"]]]]], RowBox[List["\[DifferentialD]", "t"]]]]]]]]]]]]

 MathML Form

 Q GammaRegularized ( a , z ) 1 Γ ( a ) z t a - 1 - t t GammaRegularized a z 1 Gamma a -1 t z t a -1 -1 t [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["GammaRegularized", "[", RowBox[List["a_", ",", "z_"]], "]"]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List[SubsuperscriptBox["\[Integral]", "z", "\[Infinity]"], RowBox[List[RowBox[List[SuperscriptBox["t", RowBox[List["a", "-", "1"]]], " ", SuperscriptBox["\[ExponentialE]", RowBox[List["-", "t"]]]]], RowBox[List["\[DifferentialD]", "t"]]]]]], RowBox[List["Gamma", "[", "a", "]"]]]]]]]

 Date Added to functions.wolfram.com (modification date)

 2001-10-29