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 Power

 http://functions.wolfram.com/01.02.16.0060.01

 Input Form

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

 Standard Form

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

 MathML Form

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

 Rule Form

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

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

 2007-05-02