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 Power

 http://functions.wolfram.com/01.02.16.0003.01

 Input Form

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

 Standard Form

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

 MathML Form

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

 Rule Form

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

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

 2001-10-29