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 Erfc

 http://functions.wolfram.com/06.27.26.0015.01

 Input Form

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

 Standard Form

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

 MathML Form

 erfc ( z ) 1 - z 2 z ( 1 - 1 π Γ ( 1 2 , z 2 ) ) Erfc z 1 -1 z 2 1 2 z -1 1 -1 1 1 2 -1 Gamma 1 2 z 2 [/itex]

 Rule Form

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

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

 2001-10-29