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 Catalan

 http://functions.wolfram.com/02.07.07.0026.01

 Input Form

 Catalan == (Pi/4) Log[2] - (1/2) Integrate[(1/Sqrt[t]) (Log[1 - t]/(1 + t)), {t, 0, 1}]

 Standard Form

 Cell[BoxData[RowBox[List["Catalan", "\[Equal]", RowBox[List[RowBox[List[FractionBox["\[Pi]", "4"], RowBox[List["Log", "[", "2", "]"]]]], "-", RowBox[List[FractionBox["1", "2"], " ", RowBox[List[SubsuperscriptBox["\[Integral]", "0", "1"], RowBox[List[FractionBox["1", SqrtBox["t"]], FractionBox[RowBox[List["Log", "[", RowBox[List["1", "-", "t"]], "]"]], RowBox[List["1", "+", "t"]]], RowBox[List["\[DifferentialD]", "t"]]]]]]]]]]]]]]

 MathML Form

 C TagBox["C", Function[Catalan]] π 4 log ( 2 ) - 1 2 0 1 log ( 1 - t ) t ( t + 1 ) t Catalan 4 -1 2 -1 1 2 t 0 1 1 -1 t t 1 2 t 1 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", "Catalan", "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List[FractionBox["1", "4"], " ", "\[Pi]", " ", RowBox[List["Log", "[", "2", "]"]]]], "-", RowBox[List[FractionBox["1", "2"], " ", RowBox[List[SubsuperscriptBox["\[Integral]", "0", "1"], RowBox[List[FractionBox[RowBox[List["Log", "[", RowBox[List["1", "-", "t"]], "]"]], RowBox[List[SqrtBox["t"], " ", RowBox[List["(", RowBox[List["1", "+", "t"]], ")"]]]]], RowBox[List["\[DifferentialD]", "t"]]]]]]]]]]]]]]

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

 2001-10-29