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 Power

 http://functions.wolfram.com/01.02.17.0006.01

 Input Form

 z^a == x^a (z/x)^a Exp[2 a Pi I Floor[Arg[z - x]/(2 Pi)]] /; x < 0

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[SuperscriptBox["z", "a"], "\[Equal]", " ", RowBox[List[SuperscriptBox["x", "a"], SuperscriptBox[RowBox[List["(", FractionBox["z", "x"], ")"]], "a"], RowBox[List["Exp", "[", RowBox[List["2", "a", " ", "\[Pi]", " ", "\[ImaginaryI]", " ", RowBox[List["Floor", "[", FractionBox[RowBox[List["Arg", "[", RowBox[List["z", "-", "x"]], "]"]], RowBox[List["2", " ", "\[Pi]"]]], "]"]]]], "]"]]]]]], "/;", RowBox[List["x", "<", "0"]]]]]]

 MathML Form

 z a x a ( z x ) a 2 a π arg ( z - x ) 2 π /; x < 0 Condition z a x a z x -1 a 2 a z -1 x 2 -1 x 0 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", SuperscriptBox["z_", "a_"], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List[SuperscriptBox["x", "a"], " ", SuperscriptBox[RowBox[List["(", FractionBox["z", "x"], ")"]], "a"], " ", SuperscriptBox["\[ExponentialE]", RowBox[List["2", " ", "a", " ", "\[Pi]", " ", "\[ImaginaryI]", " ", RowBox[List["Floor", "[", FractionBox[RowBox[List["Arg", "[", RowBox[List["z", "-", "x"]], "]"]], RowBox[List["2", " ", "\[Pi]"]]], "]"]]]]]]], "/;", RowBox[List["x", "<", "0"]]]]]]]]

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

 2007-05-02