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   http://functions.wolfram.com/09.17.06.0003.01
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    WeierstrassZeta[z, {Subscript[g, 2], Subscript[g, 3]}] == 
 (Subscript[\[Eta], 1] z)/Subscript[\[Omega], 1] + 
  (Pi/(2 Subscript[\[Omega], 1])) Cot[(Pi z)/(2 Subscript[\[Omega], 1])] + 
  ((2 Pi)/Subscript[\[Omega], 1]) Sum[(q^(2 k)/(1 - q^(2 k))) 
     Sin[(k Pi z)/Subscript[\[Omega], 1]], {k, 1, Infinity}] 
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   Cell[BoxData[RowBox[List[RowBox[List["WeierstrassZeta", "[", RowBox[List["z", ",", RowBox[List["{", RowBox[List[SubscriptBox["g", "2"], ",", SubscriptBox["g", "3"]]], "}"]]]], "]"]], "\[Equal]", RowBox[List[FractionBox[RowBox[List[SubscriptBox["\[Eta]", "1"], " ", "z"]], SubscriptBox["\[Omega]", "1"]], "+", RowBox[List[FractionBox["\[Pi]", RowBox[List["2", SubscriptBox["\[Omega]", "1"]]]], " ", RowBox[List["Cot", "[", FractionBox[RowBox[List["\[Pi]", " ", "z"]], RowBox[List["2", SubscriptBox["\[Omega]", "1"]]]], "]"]]]], "+", RowBox[List[FractionBox[RowBox[List["2", "\[Pi]"]], SubscriptBox["\[Omega]", "1"]], " ", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "1"]], "\[Infinity]"], RowBox[List[FractionBox[SuperscriptBox["q", RowBox[List["2", "k"]]], RowBox[List["1", "-", SuperscriptBox["q", RowBox[List["2", "k"]]]]]], " ", RowBox[List["Sin", "[", FractionBox[RowBox[List["k", " ", "\[Pi]", " ", "z"]], SubscriptBox["\[Omega]", "1"]], "]"]]]]]]]]]]]]]] 
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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>  <semantics>  <mrow>  <mi> ζ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mrow>  <mi> z </mi>  <mo> ; </mo>  <msub>  <mi> g </mi>  <mn> 2 </mn>  </msub>  </mrow>  <mo> , </mo>  <msub>  <mi> g </mi>  <mn> 3 </mn>  </msub>  </mrow>  <mo> ) </mo>  </mrow>  <annotation encoding='Mathematica'> TagBox[RowBox[List["\[Zeta]", "(", RowBox[List[RowBox[List[TagBox["z", Rule[Editable, True]], ";", TagBox[SubscriptBox["g", "2"], Rule[Editable, True]]]], ",", TagBox[SubscriptBox["g", "3"], Rule[Editable, True]]]], ")"]], InterpretTemplate[Function[WeierstrassZeta[Slot[1], List[Slot[2], Slot[3]]]]]] </annotation>  </semantics>  <mo> ⩵ </mo>  <mrow>  <mfrac>  <mrow>  <msub>  <mi> η </mi>  <mn> 1 </mn>  </msub>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  <msub>  <mi> ω </mi>  <mn> 1 </mn>  </msub>  </mfrac>  <mo> + </mo>  <mrow>  <mfrac>  <mi> π </mi>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <msub>  <mi> ω </mi>  <mn> 1 </mn>  </msub>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <mrow>  <mi> cot </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mfrac>  <mrow>  <mi> π </mi>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <msub>  <mi> ω </mi>  <mn> 1 </mn>  </msub>  </mrow>  </mfrac>  <mo> ) </mo>  </mrow>  </mrow>  <mo> + </mo>  <mrow>  <mfrac>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> π </mi>  </mrow>  <msub>  <mi> ω </mi>  <mn> 1 </mn>  </msub>  </mfrac>  <mo> ⁢ </mo>  <mrow>  <munderover>  <mo> ∑ </mo>  <mrow>  <mi> k </mi>  <mo> = </mo>  <mn> 1 </mn>  </mrow>  <mi> ∞ </mi>  </munderover>  <mrow>  <mfrac>  <msup>  <mi> q </mi>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  </msup>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <msup>  <mi> q </mi>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  </msup>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <mrow>  <mi> sin </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mfrac>  <mrow>  <mi> k </mi>  <mo> ⁢ </mo>  <mi> π </mi>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  <msub>  <mi> ω </mi>  <mn> 1 </mn>  </msub>  </mfrac>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <ci> WeierstrassZeta </ci>  <ci> z </ci>  <list>  <apply>  <ci> Subscript </ci>  <ci> g </ci>  <cn type='integer'> 2 </cn>  </apply>  <apply>  <ci> Subscript </ci>  <ci> g </ci>  <cn type='integer'> 3 </cn>  </apply>  </list>  </apply>  <apply>  <plus />  <apply>  <times />  <apply>  <ci> Subscript </ci>  <ci> η </ci>  <cn type='integer'> 1 </cn>  </apply>  <ci> z </ci>  <apply>  <power />  <apply>  <ci> Subscript </ci>  <ci> ω </ci>  <cn type='integer'> 1 </cn>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <times />  <apply>  <times />  <pi />  <apply>  <power />  <apply>  <times />  <cn type='integer'> 2 </cn>  <apply>  <ci> Subscript </ci>  <ci> ω </ci>  <cn type='integer'> 1 </cn>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <cot />  <apply>  <times />  <pi />  <ci> z </ci>  <apply>  <power />  <apply>  <times />  <cn type='integer'> 2 </cn>  <apply>  <ci> Subscript </ci>  <ci> ω </ci>  <cn type='integer'> 1 </cn>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <times />  <apply>  <times />  <cn type='integer'> 2 </cn>  <pi />  <apply>  <power />  <apply>  <ci> Subscript </ci>  <ci> ω </ci>  <cn type='integer'> 1 </cn>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <sum />  <bvar>  <ci> k </ci>  </bvar>  <lowlimit>  <cn type='integer'> 1 </cn>  </lowlimit>  <uplimit>  <infinity />  </uplimit>  <apply>  <times />  <apply>  <times />  <apply>  <power />  <ci> q </ci>  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> k </ci>  </apply>  </apply>  <apply>  <power />  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <power />  <ci> q </ci>  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> k </ci>  </apply>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <sin />  <apply>  <times />  <ci> k </ci>  <pi />  <ci> z </ci>  <apply>  <power />  <apply>  <ci> Subscript </ci>  <ci> ω </ci>  <cn type='integer'> 1 </cn>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["WeierstrassZeta", "[", RowBox[List["z_", ",", RowBox[List["{", RowBox[List[SubscriptBox["g_", "2"], ",", SubscriptBox["g_", "3"]]], "}"]]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox[RowBox[List[SubscriptBox["\[Eta]", "1"], " ", "z"]], SubscriptBox["\[Omega]", "1"]], "+", FractionBox[RowBox[List["\[Pi]", " ", RowBox[List["Cot", "[", FractionBox[RowBox[List["\[Pi]", " ", "z"]], RowBox[List["2", " ", SubscriptBox["\[Omega]", "1"]]]], "]"]]]], RowBox[List["2", " ", SubscriptBox["\[Omega]", "1"]]]], "+", FractionBox[RowBox[List[RowBox[List["(", RowBox[List["2", " ", "\[Pi]"]], ")"]], " ", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "1"]], "\[Infinity]"], FractionBox[RowBox[List[SuperscriptBox["q", RowBox[List["2", " ", "k"]]], " ", RowBox[List["Sin", "[", FractionBox[RowBox[List["k", " ", "\[Pi]", " ", "z"]], SubscriptBox["\[Omega]", "1"]], "]"]]]], RowBox[List["1", "-", SuperscriptBox["q", RowBox[List["2", " ", "k"]]]]]]]]]], SubscriptBox["\[Omega]", "1"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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