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   http://functions.wolfram.com/05.09.26.0026.01
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    UnitStep[Abs[z] - 1] (z - 1)^(-\[Lambda] - n/2) 
  GegenbauerC[n, \[Lambda], (2 z - 1)/(2 Sqrt[z] Sqrt[z - 1])] == 
 (((-1)^n Gamma[1 - \[Lambda]])/n!) 
  MeijerG[{{1 - \[Lambda] - n/2, \[Lambda] - n/2}, {}}, 
   {{}, {\[Lambda] + n/2, -(n/2)}}, z] 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["UnitStep", "[", RowBox[List[RowBox[List["Abs", "[", "z", "]"]], "-", "1"]], "]"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["z", "-", "1"]], ")"]], RowBox[List[RowBox[List["-", "\[Lambda]"]], "-", FractionBox["n", "2"]]]], " ", RowBox[List["GegenbauerC", "[", RowBox[List["n", ",", "\[Lambda]", ",", FractionBox[RowBox[List[RowBox[List["2", "z"]], "-", "1"]], RowBox[List["2", " ", SqrtBox["z"], SqrtBox[RowBox[List["z", "-", "1"]]]]]]]], "]"]]]], "\[Equal]", RowBox[List[FractionBox[RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], "n"], " ", RowBox[List["Gamma", "[", RowBox[List["1", "-", "\[Lambda]"]], "]"]]]], RowBox[List["n", "!"]]], " ", RowBox[List["MeijerG", "[", RowBox[List[RowBox[List["{", RowBox[List[RowBox[List["{", RowBox[List[RowBox[List["1", "-", "\[Lambda]", "-", FractionBox["n", "2"]]], ",", RowBox[List["\[Lambda]", "-", FractionBox["n", "2"]]]]], "}"]], ",", RowBox[List["{", "}"]]]], "}"]], ",", RowBox[List["{", RowBox[List[RowBox[List["{", "}"]], ",", RowBox[List["{", RowBox[List[RowBox[List["\[Lambda]", "+", FractionBox["n", "2"]]], ",", RowBox[List["-", FractionBox["n", "2"]]]]], "}"]]]], "}"]], ",", "z"]], "]"]]]]]]]] 
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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>  <semantics>  <mi> θ </mi>  <annotation-xml encoding='MathML-Content'>  <ci> UnitStep </ci>  </annotation-xml>  </semantics>  <mo> ( </mo>  <mrow>  <mrow>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[LeftBracketingBar]" </annotation>  </semantics>  <mi> z </mi>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[RightBracketingBar]" </annotation>  </semantics>  </mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mrow>  <mrow>  <mo> - </mo>  <mfrac>  <mi> n </mi>  <mn> 2 </mn>  </mfrac>  </mrow>  <mo> - </mo>  <mi> λ </mi>  </mrow>  </msup>  <mo> ⁢ </mo>  <mrow>  <msubsup>  <mi> C </mi>  <mi> n </mi>  <mi> λ </mi>  </msubsup>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mfrac>  <mrow>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <msqrt>  <mi> z </mi>  </msqrt>  <mo> ⁢ </mo>  <msqrt>  <mrow>  <mi> z </mi>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msqrt>  </mrow>  </mfrac>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mfrac>  <mrow>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mi> n </mi>  </msup>  <mo> ⁢ </mo>  <mrow>  <mi> Γ </mi>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mi> λ </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <mrow>  <mi> n </mi>  <mo> ! </mo>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <semantics>  <mrow>  <msubsup>  <mi> G </mi>  <mrow>  <mn> 2 </mn>  <mo> , </mo>  <mn> 2 </mn>  </mrow>  <mrow>  <mn> 0 </mn>  <mo> , </mo>  <mn> 2 </mn>  </mrow>  </msubsup>  <mo> ⁡ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mtable>  <mtr>  <mtd>  <mrow>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mfrac>  <mi> n </mi>  <mn> 2 </mn>  </mfrac>  <mo> - </mo>  <mi> λ </mi>  </mrow>  <mo> , </mo>  <mrow>  <mi> λ </mi>  <mo> - </mo>  <mfrac>  <mi> n </mi>  <mn> 2 </mn>  </mfrac>  </mrow>  </mrow>  </mtd>  </mtr>  <mtr>  <mtd>  <mrow>  <mrow>  <mfrac>  <mi> n </mi>  <mn> 2 </mn>  </mfrac>  <mo> + </mo>  <mi> λ </mi>  </mrow>  <mo> , </mo>  <mrow>  <mo> - </mo>  <mfrac>  <mi> n </mi>  <mn> 2 </mn>  </mfrac>  </mrow>  </mrow>  </mtd>  </mtr>  </mtable>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <annotation encoding='Mathematica'> TagBox[RowBox[List[SubsuperscriptBox[TagBox["G", MeijerG], RowBox[List["2", ",", "2"]], RowBox[List["0", ",", "2"]]], "\[InvisibleApplication]", RowBox[List["(", RowBox[List[TagBox["z", MeijerG, Rule[Editable, True]], "\[VerticalSeparator]", GridBox[List[List[RowBox[List[TagBox[RowBox[List["1", "-", FractionBox["n", "2"], "-", "\[Lambda]"]], MeijerG, Rule[Editable, True]], ",", TagBox[RowBox[List["\[Lambda]", "-", FractionBox["n", "2"]]], MeijerG, Rule[Editable, True]]]]], List[RowBox[List[TagBox[RowBox[List[FractionBox["n", "2"], "+", "\[Lambda]"]], MeijerG, Rule[Editable, True]], ",", TagBox[RowBox[List["-", FractionBox["n", "2"]]], MeijerG, Rule[Editable, True]]]]]]]]], ")"]]]], MeijerG, Rule[Editable, False]] </annotation>  </semantics>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <times />  <apply>  <ci> UnitStep </ci>  <apply>  <plus />  <apply>  <abs />  <ci> z </ci>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <power />  <apply>  <plus />  <ci> z </ci>  <cn type='integer'> -1 </cn>  </apply>  <apply>  <plus />  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <ci> n </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> λ </ci>  </apply>  </apply>  </apply>  <apply>  <times />  <apply>  <power />  <apply>  <ci> Subscript </ci>  <ci> C </ci>  <ci> n </ci>  </apply>  <ci> λ </ci>  </apply>  <apply>  <times />  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> z </ci>  </apply>  <cn type='integer'> -1 </cn>  </apply>  <apply>  <power />  <apply>  <times />  <cn type='integer'> 2 </cn>  <apply>  <power />  <ci> z </ci>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  <apply>  <power />  <apply>  <plus />  <ci> z </ci>  <cn type='integer'> -1 </cn>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <times />  <apply>  <times />  <apply>  <power />  <cn type='integer'> -1 </cn>  <ci> n </ci>  </apply>  <apply>  <times />  <ci> Γ </ci>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> λ </ci>  </apply>  </apply>  </apply>  <apply>  <power />  <apply>  <factorial />  <ci> n </ci>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <ci> MeijerG </ci>  <list>  <list>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <ci> n </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> λ </ci>  </apply>  </apply>  <apply>  <plus />  <ci> λ </ci>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <ci> n </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  </list>  <list />  </list>  <list>  <list />  <list>  <apply>  <plus />  <apply>  <times />  <ci> n </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <ci> λ </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <ci> n </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </list>  </list>  <ci> z </ci>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[RowBox[List["UnitStep", "[", RowBox[List[RowBox[List["Abs", "[", "z_", "]"]], "-", "1"]], "]"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["z_", "-", "1"]], ")"]], RowBox[List[RowBox[List["-", "\[Lambda]_"]], "-", FractionBox["n_", "2"]]]], " ", RowBox[List["GegenbauerC", "[", RowBox[List["n_", ",", "\[Lambda]_", ",", FractionBox[RowBox[List[RowBox[List["2", " ", "z_"]], "-", "1"]], RowBox[List["2", " ", SqrtBox["z_"], " ", SqrtBox[RowBox[List["z_", "-", "1"]]]]]]]], "]"]]]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List[RowBox[List["(", RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], "n"], " ", RowBox[List["Gamma", "[", RowBox[List["1", "-", "\[Lambda]"]], "]"]]]], ")"]], " ", RowBox[List["MeijerG", "[", RowBox[List[RowBox[List["{", RowBox[List[RowBox[List["{", RowBox[List[RowBox[List["1", "-", "\[Lambda]", "-", FractionBox["n", "2"]]], ",", RowBox[List["\[Lambda]", "-", FractionBox["n", "2"]]]]], "}"]], ",", RowBox[List["{", "}"]]]], "}"]], ",", RowBox[List["{", RowBox[List[RowBox[List["{", "}"]], ",", RowBox[List["{", RowBox[List[RowBox[List["\[Lambda]", "+", FractionBox["n", "2"]]], ",", RowBox[List["-", FractionBox["n", "2"]]]]], "}"]]]], "}"]], ",", "z"]], "]"]]]], RowBox[List["n", "!"]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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