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http://functions.wolfram.com/10.01.23.0007.01
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Sum[(Zeta[2 k]/(2 k + 1)) (1/2^(2 k + 1) - 1/2^(4 k)), {k, 0, Infinity}] ==
Catalan/Pi
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Cell[BoxData[RowBox[List[RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", " ", "=", " ", "0"]], "\[Infinity]"], " ", RowBox[List[FractionBox[RowBox[List["Zeta", "[", RowBox[List["2", "k"]], "]"]], RowBox[List[RowBox[List["2", "k"]], "+", "1"]]], RowBox[List["(", RowBox[List[FractionBox["1", SuperscriptBox["2", RowBox[List[RowBox[List["2", "k"]], "+", "1"]]]], "-", FractionBox["1", SuperscriptBox["2", RowBox[List["4", "k"]]]]]], ")"]]]]]], "\[Equal]", FractionBox["Catalan", "Pi"]]]]]
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<math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'> <semantics> <mrow> <mrow> <munderover> <mo> ∑ </mo> <mrow> <mi> k </mi> <mo> = </mo> <mn> 0 </mn> </mrow> <mi> ∞ </mi> </munderover> <mrow> <mfrac> <mrow> <semantics> <mrow> <mi> ζ </mi> <mo> ⁡ </mo> <mo> ( </mo> <mrow> <mn> 2 </mn> <mo> ⁢ </mo> <mi> k </mi> </mrow> <mo> ) </mo> </mrow> <annotation encoding='Mathematica'> TagBox[RowBox[List["\[Zeta]", "(", TagBox[RowBox[List["2", " ", "k"]], Zeta, Rule[Editable, True]], ")"]], InterpretTemplate[Function[BoxForm`e$, Zeta[BoxForm`e$]]]] </annotation> </semantics> <mtext> </mtext> </mrow> <mrow> <mrow> <mn> 2 </mn> <mo> ⁢ </mo> <mi> k </mi> </mrow> <mo> + </mo> <mn> 1 </mn> </mrow> </mfrac> <mo> ⁢ </mo> <mrow> <mo> ( </mo> <mrow> <mfrac> <mn> 1 </mn> <msup> <mn> 2 </mn> <mrow> <mrow> <mn> 2 </mn> <mo> ⁢ </mo> <mi> k </mi> </mrow> <mo> + </mo> <mn> 1 </mn> </mrow> </msup> </mfrac> <mo> - </mo> <mfrac> <mn> 1 </mn> <msup> <mn> 2 </mn> <mrow> <mn> 4 </mn> <mo> ⁢ </mo> <mi> k </mi> </mrow> </msup> </mfrac> </mrow> <mo> ) </mo> </mrow> </mrow> </mrow> <mo>  </mo> <mfrac> <semantics> <mi> C </mi> <annotation encoding='Mathematica'> TagBox["C", Function[List[], Catalan]] </annotation> </semantics> <mi> π </mi> </mfrac> </mrow> <annotation-xml encoding='MathML-Content'> <apply> <eq /> <apply> <sum /> <bvar> <ci> k </ci> </bvar> <lowlimit> <cn type='integer'> 0 </cn> </lowlimit> <uplimit> <infinity /> </uplimit> <apply> <times /> <apply> <times /> <apply> <ci> Zeta </ci> <apply> <times /> <cn type='integer'> 2 </cn> <ci> k </ci> </apply> </apply> <apply> <power /> <apply> <plus /> <apply> <times /> <cn type='integer'> 2 </cn> <ci> k </ci> </apply> <cn type='integer'> 1 </cn> </apply> <cn type='integer'> -1 </cn> </apply> </apply> <apply> <plus /> <apply> <times /> <cn type='integer'> 1 </cn> <apply> <power /> <apply> <power /> <cn type='integer'> 2 </cn> <apply> <plus /> <apply> <times /> <cn type='integer'> 2 </cn> <ci> k </ci> </apply> <cn type='integer'> 1 </cn> </apply> </apply> <cn type='integer'> -1 </cn> </apply> </apply> <apply> <times /> <cn type='integer'> -1 </cn> <apply> <times /> <cn type='integer'> 1 </cn> <apply> <power /> <apply> <power /> <cn type='integer'> 2 </cn> <apply> <times /> <cn type='integer'> 4 </cn> <ci> k </ci> </apply> </apply> <cn type='integer'> -1 </cn> </apply> </apply> </apply> </apply> </apply> </apply> <apply> <times /> <ci> Catalan </ci> <apply> <power /> <pi /> <cn type='integer'> -1 </cn> </apply> </apply> </apply> </annotation-xml> </semantics> </math>
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| Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "0"]], "\[Infinity]"], FractionBox[RowBox[List[RowBox[List["Zeta", "[", RowBox[List["2", " ", "k"]], "]"]], " ", RowBox[List["(", RowBox[List[FractionBox["1", SuperscriptBox["2", RowBox[List[RowBox[List["2", " ", "k"]], "+", "1"]]]], "-", FractionBox["1", SuperscriptBox["2", RowBox[List["4", " ", "k"]]]]]], ")"]]]], RowBox[List[RowBox[List["2", " ", "k"]], "+", "1"]]]]], "]"]], "\[RuleDelayed]", FractionBox["Catalan", "\[Pi]"]]]]] |
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Date Added to functions.wolfram.com (modification date)
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