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 Power

 http://functions.wolfram.com/01.02.16.0055.01

 Input Form

 (1/z)^a == z^(-a) /; Arg[z] != Pi || Element[a, Integers]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[SuperscriptBox[RowBox[List["(", FractionBox["1", "z"], ")"]], "a"], "\[Equal]", SuperscriptBox["z", RowBox[List["-", "a"]]]]], "/;", RowBox[List[RowBox[List[RowBox[List["Arg", "[", "z", "]"]], "\[NotEqual]", "\[Pi]"]], "\[Or]", RowBox[List["a", "\[Element]", "Integers"]]]]]]]]

 MathML Form

 ( 1 z ) a z - a /; arg ( z ) π a TagBox["\[DoubleStruckCapitalZ]", Function[Integers]] Condition 1 z -1 a z -1 a z a [/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"]]], "/;", RowBox[List[RowBox[List[RowBox[List["Arg", "[", "z", "]"]], "\[NotEqual]", "\[Pi]"]], "||", RowBox[List["a", "\[Element]", "Integers"]]]]]]]]]]

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

 2007-05-02