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   http://functions.wolfram.com/07.13.04.0006.01
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    Singularities[GegenbauerC[\[Nu], z], z] == {{ComplexInfinity, Abs[\[Nu]]}} /; 
 Element[\[Nu], Integers] 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Singularities", "[", RowBox[List[RowBox[List["GegenbauerC", "[", RowBox[List["\[Nu]", ",", "z"]], "]"]], ",", "z"]], "]"]], "\[Equal]", RowBox[List["{", RowBox[List["{", RowBox[List["ComplexInfinity", ",", RowBox[List["Abs", "[", "\[Nu]", "]"]]]], "}"]], "}"]]]], "/;", RowBox[List["\[Nu]", "\[Element]", "Integers"]]]]]] 
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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>  <mrow>  <msub>  <mi> 𝒮𝒾𝓃ℊ </mi>  <mi> z </mi>  </msub>  <mo> ( </mo>  <mrow>  <msubsup>  <mi> C </mi>  <mi> ν </mi>  <mrow>  <mo> ( </mo>  <mn> 0 </mn>  <mo> ) </mo>  </mrow>  </msubsup>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mo> { </mo>  <mrow>  <mo> { </mo>  <mrow>  <mover>  <mi> ∞ </mi>  <mo> ~ </mo>  </mover>  <mo> , </mo>  <mrow>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[LeftBracketingBar]" </annotation>  </semantics>  <mi> ν </mi>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[RightBracketingBar]" </annotation>  </semantics>  </mrow>  </mrow>  <mo> } </mo>  </mrow>  <mo> } </mo>  </mrow>  </mrow>  <mo> /; </mo>  <mrow>  <mi> ν </mi>  <mo> ∈ </mo>  <mi> ℤ </mi>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <apply>  <ci> Subscript </ci>  <ci> 𝒮𝒾𝓃ℊ </ci>  <ci> z </ci>  </apply>  <apply>  <ci> GegenbauerC </ci>  <ci> ν </ci>  <cn type='integer'> 0 </cn>  <ci> z </ci>  </apply>  </apply>  <list>  <list>  <apply>  <ci> OverTilde </ci>  <infinity />  </apply>  <apply>  <abs />  <ci> ν </ci>  </apply>  </list>  </list>  </apply>  <apply>  <in />  <ci> ν </ci>  <ci> ℤ </ci>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Singularities", "[", RowBox[List[RowBox[List["GegenbauerC", "[", RowBox[List["\[Nu]_", ",", "z_"]], "]"]], ",", "z_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["{", RowBox[List["{", RowBox[List["ComplexInfinity", ",", RowBox[List["Abs", "[", "\[Nu]", "]"]]]], "}"]], "}"]], "/;", RowBox[List["\[Nu]", "\[Element]", "Integers"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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