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 Power

 http://functions.wolfram.com/01.02.16.0057.01

 Input Form

 (1/z)^a == Exp[2 Pi I a Floor[(Pi + Arg[z])/(2 Pi)]]/z^a

 Standard Form

 Cell[BoxData[RowBox[List[SuperscriptBox[RowBox[List["(", FractionBox["1", "z"], ")"]], "a"], "\[Equal]", RowBox[List[SuperscriptBox["z", RowBox[List["-", "a"]]], " ", RowBox[List["Exp", "[", RowBox[List["2", " ", "\[Pi]", " ", "\[ImaginaryI]", " ", "a", " ", RowBox[List["Floor", "[", FractionBox[RowBox[List["\[Pi]", " ", "+", RowBox[List["Arg", "[", "z", "]"]]]], RowBox[List["2", " ", "\[Pi]"]]], "]"]]]], "]"]]]]]]]]

 MathML Form

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

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", SuperscriptBox[RowBox[List["(", FractionBox["1", "z_"], ")"]], "a_"], "]"]], "\[RuleDelayed]", RowBox[List[SuperscriptBox["z", RowBox[List["-", "a"]]], " ", SuperscriptBox["\[ExponentialE]", RowBox[List["2", " ", "\[Pi]", " ", "\[ImaginaryI]", " ", "a", " ", RowBox[List["Floor", "[", FractionBox[RowBox[List["\[Pi]", "+", RowBox[List["Arg", "[", "z", "]"]]]], RowBox[List["2", " ", "\[Pi]"]]], "]"]]]]]]]]]]]

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

 2007-05-02