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 Erfi

 http://functions.wolfram.com/06.28.26.0019.01

 Input Form

 Erfi[z] == (Sqrt[-z^2]/z) ((1/Sqrt[Pi]) Gamma[1/2, -z^2] - 1)

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["Erfi", "[", "z", "]"]], "\[Equal]", RowBox[List[FractionBox[RowBox[List[SqrtBox[RowBox[List["-", SuperscriptBox["z", "2"]]]], " "]], "z"], RowBox[List["(", RowBox[List[RowBox[List[FractionBox["1", SqrtBox["\[Pi]"]], RowBox[List["Gamma", "[", RowBox[List[FractionBox["1", "2"], ",", RowBox[List["-", SuperscriptBox["z", "2"]]]]], "]"]]]], "-", "1"]], ")"]]]]]]]]

 MathML Form

 erfi ( z ) - z 2 z ( 1 π Γ ( 1 2 , - z 2 ) - 1 ) Erfi z -1 z 2 1 2 z -1 1 1 2 -1 Gamma 1 2 -1 z 2 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Erfi", "[", "z_", "]"]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List[SqrtBox[RowBox[List["-", SuperscriptBox["z", "2"]]]], " ", RowBox[List["(", RowBox[List[FractionBox[RowBox[List["Gamma", "[", RowBox[List[FractionBox["1", "2"], ",", RowBox[List["-", SuperscriptBox["z", "2"]]]]], "]"]], SqrtBox["\[Pi]"]], "-", "1"]], ")"]]]], "z"]]]]]

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

 2001-10-29

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