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http://functions.wolfram.com/06.08.03.0013.01
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GammaRegularized[a, -1] == (E/Gamma[a]) Subfactorial[a - 1]
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Cell[BoxData[RowBox[List[RowBox[List["GammaRegularized", "[", RowBox[List["a", ",", RowBox[List["-", "1"]]]], "]"]], "\[Equal]", RowBox[List[FractionBox["\[ExponentialE]", RowBox[List["Gamma", "[", "a", "]"]]], " ", RowBox[List["Subfactorial", "[", RowBox[List["a", "-", "1"]], "]"]]]]]]]]
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<math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'> <semantics> <mrow> <mrow> <semantics> <mi> Q </mi> <annotation-xml encoding='MathML-Content'> <ci> GammaRegularized </ci> </annotation-xml> </semantics> <mo> ( </mo> <mrow> <mi> a </mi> <mo> , </mo> <mrow> <mo> - </mo> <mn> 1 </mn> </mrow> </mrow> <mo> ) </mo> </mrow> <mo>  </mo> <mrow> <mfrac> <mrow> <mi> ⅇ </mi> <mtext> </mtext> </mrow> <mrow> <mi> Γ </mi> <mo> ⁡ </mo> <mo> ( </mo> <mi> a </mi> <mo> ) </mo> </mrow> </mfrac> <mo> ⁢ </mo> <mrow> <mi> Subfactorial </mi> <mo> ⁡ </mo> <mo> ( </mo> <mrow> <mi> a </mi> <mo> - </mo> <mn> 1 </mn> </mrow> <mo> ) </mo> </mrow> </mrow> </mrow> <annotation-xml encoding='MathML-Content'> <apply> <eq /> <apply> <ci> GammaRegularized </ci> <ci> a </ci> <cn type='integer'> -1 </cn> </apply> <apply> <times /> <apply> <times /> <exponentiale /> <apply> <power /> <apply> <ci> Gamma </ci> <ci> a </ci> </apply> <cn type='integer'> -1 </cn> </apply> </apply> <apply> <ci> Subfactorial </ci> <apply> <plus /> <ci> a </ci> <cn type='integer'> -1 </cn> </apply> </apply> </apply> </apply> </annotation-xml> </semantics> </math>
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| Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["GammaRegularized", "[", RowBox[List["a_", ",", RowBox[List["-", "1"]]]], "]"]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List["\[ExponentialE]", " ", RowBox[List["Subfactorial", "[", RowBox[List["a", "-", "1"]], "]"]]]], RowBox[List["Gamma", "[", "a", "]"]]]]]]] |
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Date Added to functions.wolfram.com (modification date)
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