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 Re

 http://functions.wolfram.com/12.03.20.0002.01

 Input Form

 D[Re[x], {x, \[Alpha]}] == x^(1 - \[Alpha])/Gamma[2 - \[Alpha]] /; Element[x, Reals]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List[SubscriptBox["\[PartialD]", RowBox[List["{", RowBox[List["x", ",", "\[Alpha]"]], "}"]]], RowBox[List["Re", "[", "x", "]"]]]], "\[Equal]", FractionBox[SuperscriptBox["x", RowBox[List["1", "-", "\[Alpha]"]]], RowBox[List["Gamma", "[", RowBox[List["2", "-", "\[Alpha]"]], "]"]]]]], "/;", RowBox[List["x", "\[Element]", "Reals"]]]]]]

 MathML Form

 α Re ( x ) x α x 1 - α Γ ( 2 - α ) /; x TagBox["\[DoubleStruckCapitalR]", Function[Reals]] Condition x α x x 1 -1 α Gamma 2 -1 α -1 x [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[SubscriptBox["\[PartialD]", RowBox[List[RowBox[List["{", RowBox[List["x_", ",", "\[Alpha]_"]], "}"]]]]], RowBox[List["Re", "[", "x_", "]"]]]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox[SuperscriptBox["x", RowBox[List["1", "-", "\[Alpha]"]]], RowBox[List["Gamma", "[", RowBox[List["2", "-", "\[Alpha]"]], "]"]]], "/;", RowBox[List["x", "\[Element]", "Reals"]]]]]]]]

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

 2001-10-29