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 Arg

 http://functions.wolfram.com/12.02.16.0054.01

 Input Form

 Arg[-(I/z)] == -(Pi/2) + 2 Pi Floor[3/4 + Arg[z]/(2 Pi)] - Arg[z]

 Standard Form

 Cell[BoxData[RowBox[List[" ", RowBox[List[RowBox[List["Arg", "[", RowBox[List["-", FractionBox["\[ImaginaryI]", "z"]]], "]"]], "\[Equal]", RowBox[List[RowBox[List["-", FractionBox["\[Pi]", "2"]]], "+", RowBox[List["2", " ", "\[Pi]", " ", RowBox[List["Floor", "[", RowBox[List[FractionBox["3", "4"], "+", FractionBox[RowBox[List["Arg", "[", "z", "]"]], RowBox[List["2", " ", "\[Pi]"]]]]], "]"]]]], "-", RowBox[List["Arg", "[", "z", "]"]]]]]]]]]]

 MathML Form

 arg ( - z ) - arg ( z ) + 2 π arg ( z ) 2 π + 3 4 - π 2 -1 z -1 -1 z 2 z 2 -1 3 4 -1 2 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Arg", "[", RowBox[List["-", FractionBox["\[ImaginaryI]", "z_"]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["-", FractionBox["\[Pi]", "2"]]], "+", RowBox[List["2", " ", "\[Pi]", " ", RowBox[List["Floor", "[", RowBox[List[FractionBox["3", "4"], "+", FractionBox[RowBox[List["Arg", "[", "z", "]"]], RowBox[List["2", " ", "\[Pi]"]]]]], "]"]]]], "-", RowBox[List["Arg", "[", "z", "]"]]]]]]]]

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

 2007-05-02