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 Erf

 http://functions.wolfram.com/06.25.06.0001.02

 Input Form

 Erf[z] \[Proportional] (2/Sqrt[Pi]) (z - z^3/3 + z^5/10 - \[Ellipsis]) /; (z -> 0)

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Erf", "[", "z", "]"]], "\[Proportional]", RowBox[List[FractionBox["2", SqrtBox["\[Pi]"]], RowBox[List["(", RowBox[List["z", "-", FractionBox[SuperscriptBox["z", "3"], "3"], "+", FractionBox[SuperscriptBox["z", "5"], "10"], "-", "\[Ellipsis]"]], ")"]]]]]], "/;", RowBox[List["(", RowBox[List["z", "\[Rule]", "0"]], ")"]]]]]]

 MathML Form

 erf ( z ) 2 π ( z - z 3 3 + z 5 10 - ) /; ( z "\[Rule]" 0 ) Condition Proportional Erf z 2 1 2 -1 z -1 z 3 3 -1 z 5 10 -1 -1 Rule z 0 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Erf", "[", "z_", "]"]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox[RowBox[List["2", " ", RowBox[List["(", RowBox[List["z", "-", FractionBox[SuperscriptBox["z", "3"], "3"], "+", FractionBox[SuperscriptBox["z", "5"], "10"], "-", "\[Ellipsis]"]], ")"]]]], SqrtBox["\[Pi]"]], "/;", RowBox[List["(", RowBox[List["z", "\[Rule]", "0"]], ")"]]]]]]]]

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

 2001-10-29