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 Power

 http://functions.wolfram.com/01.02.16.0076.01

 Input Form

 z^(a/2) == (z^a)^(1/2) /; Element[a, Reals] && Inequality[-Pi, Less, a Arg[z], LessEqual, Pi]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[SuperscriptBox["z", FractionBox["a", "2"]], "\[Equal]", SuperscriptBox[RowBox[List["(", SuperscriptBox["z", "a"], ")"]], FractionBox["1", "2"]]]], "/;", RowBox[List[RowBox[List["a", "\[Element]", "Reals"]], "\[And]", RowBox[List[RowBox[List["-", "\[Pi]"]], "<", RowBox[List["a", " ", RowBox[List["Arg", "[", "z", "]"]]]], "\[LessEqual]", "\[Pi]"]]]]]]]]

 MathML Form

 z a / 2 z a /; a TagBox["\[DoubleStruckCapitalR]", Function[Reals]] - π < a arg ( z ) π Condition z a 2 -1 z a 1 2 a Inequality -1 a z [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", SuperscriptBox["z_", FractionBox["a_", "2"]], "]"]], "\[RuleDelayed]", RowBox[List[SqrtBox[SuperscriptBox["z", "a"]], "/;", RowBox[List[RowBox[List["a", "\[Element]", "Reals"]], "&&", RowBox[List[RowBox[List["-", "\[Pi]"]], "<", RowBox[List["a", " ", RowBox[List["Arg", "[", "z", "]"]]]], "\[LessEqual]", "\[Pi]"]]]]]]]]]]

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

 2007-05-02