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http://functions.wolfram.com/06.34.10.0003.01
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ExpIntegralE[\[Nu], z] ==
1/(E^z (\[Nu] + z - \[Nu]/(2 + \[Nu] + z - (2 (\[Nu] + 1))/
(4 + \[Nu] + z - (3 (\[Nu] + 2))/(6 + \[Nu] + z -
(4 (\[Nu] + 3))/(8 + \[Nu] + z - (5 (\[Nu] + 4))/(10 + \[Nu] + z +
\[Ellipsis]))))))) /;
!IntervalMemberQ[Interval[{-Infinity, 0}], z]
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Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["ExpIntegralE", "[", RowBox[List["\[Nu]", ",", "z"]], "]"]], "\[Equal]", RowBox[List[SuperscriptBox["\[ExponentialE]", RowBox[List["-", "z"]]], "/", RowBox[List["(", RowBox[List["\[Nu]", "+", "z", "-", RowBox[List["\[Nu]", "/", RowBox[List["(", RowBox[List["2", "+", "\[Nu]", "+", "z", "-", FractionBox[RowBox[List["2", " ", RowBox[List["(", RowBox[List["\[Nu]", "+", "1"]], ")"]]]], RowBox[List["4", "+", "\[Nu]", "+", "z", "-", FractionBox[RowBox[List["3", " ", RowBox[List["(", RowBox[List["\[Nu]", "+", "2"]], ")"]]]], RowBox[List["6", "+", "\[Nu]", "+", "z", "-", FractionBox[RowBox[List["4", " ", RowBox[List["(", RowBox[List["\[Nu]", "+", "3"]], ")"]]]], RowBox[List["8", "+", "\[Nu]", "+", "z", "-", FractionBox[RowBox[List["5", " ", RowBox[List["(", RowBox[List["\[Nu]", "+", "4"]], ")"]]]], RowBox[List["10", "+", "\[Nu]", "+", "z", "+", "\[Ellipsis]"]]]]]]]]]]]]]], ")"]]]]]], ")"]]]]]], "/;", RowBox[List["Not", "[", RowBox[List["IntervalMemberQ", "[", RowBox[List[RowBox[List["Interval", "[", RowBox[List["{", RowBox[List[RowBox[List["-", "\[Infinity]"]], ",", "0"]], "}"]], "]"]], ",", "z"]], "]"]], "]"]]]]]]
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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> <mrow> <msub> <semantics> <mi> E </mi> <annotation encoding='Mathematica'> TagBox["E", ExpIntegralE] </annotation> </semantics> <mi> ν </mi> </msub> <mo> ( </mo> <mi> z </mi> <mo> ) </mo> </mrow> <mo> ⩵ </mo> <mrow> <msup> <mi> ⅇ </mi> <mrow> <mo> - </mo> <mi> z </mi> </mrow> </msup> <mo> / </mo> <mrow> <mo> ( </mo> <mrow> <mi> ν </mi> <mo> + </mo> <mi> z </mi> <mo> - </mo> <mrow> <mi> ν </mi> <mo> / </mo> <mrow> <mo> ( </mo> <mstyle scriptlevel='0'> <mrow> <mn> 2 </mn> <mo> + </mo> <mi> ν </mi> <mo> + </mo> <mi> z </mi> <mo> - </mo> <mfrac> <mrow> <mn> 2 </mn> <mo> ⁢ </mo> <mrow> <mo> ( </mo> <mrow> <mi> ν </mi> <mo> + </mo> <mn> 1 </mn> </mrow> <mo> ) </mo> </mrow> </mrow> <mstyle scriptlevel='0'> <mrow> <mn> 4 </mn> <mo> + </mo> <mi> ν </mi> <mo> + </mo> <mi> z </mi> <mo> - </mo> <mfrac> <mrow> <mn> 3 </mn> <mo> ⁢ </mo> <mrow> <mo> ( </mo> <mrow> <mi> ν </mi> <mo> + </mo> <mn> 2 </mn> </mrow> <mo> ) </mo> </mrow> </mrow> <mstyle scriptlevel='0'> <mrow> <mn> 6 </mn> <mo> + </mo> <mi> ν </mi> <mo> + </mo> <mi> z </mi> <mo> - </mo> <mfrac> <mrow> <mn> 4 </mn> <mo> ⁢ </mo> <mrow> <mo> ( </mo> <mrow> <mi> ν </mi> <mo> + </mo> <mn> 3 </mn> </mrow> <mo> ) </mo> </mrow> </mrow> <mrow> <mn> 8 </mn> <mstyle scriptlevel='0'> <mo> + </mo> </mstyle> <mstyle scriptlevel='0'> <mi> ν </mi> </mstyle> <mstyle scriptlevel='0'> <mo> + </mo> </mstyle> <mstyle scriptlevel='0'> <mi> z </mi> </mstyle> <mstyle scriptlevel='0'> <mo> - </mo> </mstyle> <mstyle scriptlevel='0'> <mfrac> <mrow> <mn> 5 </mn> <mo> ⁢ </mo> <mrow> <mo> ( </mo> <mrow> <mi> ν </mi> <mo> + </mo> <mn> 4 </mn> </mrow> <mo> ) </mo> </mrow> </mrow> <mstyle scriptlevel='0'> <mrow> <mn> 10 </mn> <mo> + </mo> <mi> ν </mi> <mo> + </mo> <mi> z </mi> <mo> + </mo> <mo> … </mo> </mrow> </mstyle> </mfrac> </mstyle> </mrow> </mfrac> </mrow> </mstyle> </mfrac> </mrow> </mstyle> </mfrac> </mrow> </mstyle> <mstyle scriptlevel='0'> <mo> ) </mo> </mstyle> </mrow> </mrow> </mrow> <mo> ) </mo> </mrow> </mrow> </mrow> <mo> /; </mo> <mrow> <mi> z </mi> <mo> ∉ </mo> <mrow> <mo> ( </mo> <mrow> <mrow> <mo> - </mo> <mi> ∞ </mi> </mrow> <mo> , </mo> <mn> 0 </mn> </mrow> <mo> ) </mo> </mrow> </mrow> </mrow> <annotation-xml encoding='MathML-Content'> <mrow> <mrow> <mrow> <msub> <semantics> <mi> E </mi> <annotation encoding='Mathematica'> TagBox["E", ExpIntegralE] </annotation> </semantics> <mi> ν </mi> </msub> <mo> ( </mo> <mi> z </mi> <mo> ) </mo> </mrow> <mo> ⩵ </mo> <mrow> <msup> <mi> ⅇ </mi> <mrow> <mo> - </mo> <mi> z </mi> </mrow> </msup> <mo> / </mo> <mrow> <mo> ( </mo> <mrow> <mi> ν </mi> <mo> + </mo> <mi> z </mi> <mo> - </mo> <mrow> <mi> ν </mi> <mo> / </mo> <mrow> <mo> ( </mo> <mstyle scriptlevel='0'> <mrow> <mn> 2 </mn> <mo> + </mo> <mi> ν </mi> <mo> + </mo> <mi> z </mi> <mo> - </mo> <mfrac> <mrow> <mn> 2 </mn> <mo> ⁢ </mo> <mrow> <mo> ( </mo> <mrow> <mi> ν </mi> <mo> + </mo> <mn> 1 </mn> </mrow> <mo> ) </mo> </mrow> </mrow> <mstyle scriptlevel='0'> <mrow> <mn> 4 </mn> <mo> + </mo> <mi> ν </mi> <mo> + </mo> <mi> z </mi> <mo> - </mo> <mfrac> <mrow> <mn> 3 </mn> <mo> ⁢ </mo> <mrow> <mo> ( </mo> <mrow> <mi> ν </mi> <mo> + </mo> <mn> 2 </mn> </mrow> <mo> ) </mo> </mrow> </mrow> <mstyle scriptlevel='0'> <mrow> <mn> 6 </mn> <mo> + </mo> <mi> ν </mi> <mo> + </mo> <mi> z </mi> <mo> - </mo> <mfrac> <mrow> <mn> 4 </mn> <mo> ⁢ </mo> <mrow> <mo> ( </mo> <mrow> <mi> ν </mi> <mo> + </mo> <mn> 3 </mn> </mrow> <mo> ) </mo> </mrow> </mrow> <mrow> <mn> 8 </mn> <mstyle scriptlevel='0'> <mo> + </mo> </mstyle> <mstyle scriptlevel='0'> <mi> ν </mi> </mstyle> <mstyle scriptlevel='0'> <mo> + </mo> </mstyle> <mstyle scriptlevel='0'> <mi> z </mi> </mstyle> <mstyle scriptlevel='0'> <mo> - </mo> </mstyle> <mstyle scriptlevel='0'> <mfrac> <mrow> <mn> 5 </mn> <mo> ⁢ </mo> <mrow> <mo> ( </mo> <mrow> <mi> ν </mi> <mo> + </mo> <mn> 4 </mn> </mrow> <mo> ) </mo> </mrow> </mrow> <mstyle scriptlevel='0'> <mrow> <mn> 10 </mn> <mo> + </mo> <mi> ν </mi> <mo> + </mo> <mi> z </mi> <mo> + </mo> <mo> … </mo> </mrow> </mstyle> </mfrac> </mstyle> </mrow> </mfrac> </mrow> </mstyle> </mfrac> </mrow> </mstyle> </mfrac> </mrow> </mstyle> <mstyle scriptlevel='0'> <mo> ) </mo> </mstyle> </mrow> </mrow> </mrow> <mo> ) </mo> </mrow> </mrow> </mrow> <mo> /; </mo> <mrow> <mi> z </mi> <mo> ∉ </mo> <mrow> <mo> ( </mo> <mrow> <mrow> <mo> - </mo> <mi> ∞ </mi> </mrow> <mo> , </mo> <mn> 0 </mn> </mrow> <mo> ) </mo> </mrow> </mrow> </mrow> </annotation-xml> </semantics> </math>
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| Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["ExpIntegralE", "[", RowBox[List["\[Nu]_", ",", "z_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox[SuperscriptBox["\[ExponentialE]", RowBox[List["-", "z"]]], RowBox[List["\[Nu]", "+", "z", "-", FractionBox["\[Nu]", RowBox[List["2", "+", "\[Nu]", "+", "z", "-", FractionBox[RowBox[List["2", " ", RowBox[List["(", RowBox[List["\[Nu]", "+", "1"]], ")"]]]], RowBox[List["4", "+", "\[Nu]", "+", "z", "-", FractionBox[RowBox[List["3", " ", RowBox[List["(", RowBox[List["\[Nu]", "+", "2"]], ")"]]]], RowBox[List["6", "+", "\[Nu]", "+", "z", "-", FractionBox[RowBox[List["4", " ", RowBox[List["(", RowBox[List["\[Nu]", "+", "3"]], ")"]]]], RowBox[List["8", "+", "\[Nu]", "+", "z", "-", FractionBox[RowBox[List["5", " ", RowBox[List["(", RowBox[List["\[Nu]", "+", "4"]], ")"]]]], RowBox[List["10", "+", "\[Nu]", "+", "z", "+", "\[Ellipsis]"]]]]]]]]]]]]]]]]]], "/;", RowBox[List["!", RowBox[List["IntervalMemberQ", "[", RowBox[List[RowBox[List["Interval", "[", RowBox[List["{", RowBox[List[RowBox[List["-", "\[Infinity]"]], ",", "0"]], "}"]], "]"]], ",", "z"]], "]"]]]]]]]]]] |
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Date Added to functions.wolfram.com (modification date)
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