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   http://functions.wolfram.com/06.07.04.0002.01
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    Gamma[Conjugate[a], Conjugate[Subscript[z, 1]], 
   Conjugate[Subscript[z, 2]]] == Conjugate[Gamma[a, Subscript[z, 1], 
    Subscript[z, 2]]] /; 
  !IntervalMemberQ[Interval[{-Infinity, 0}], Subscript[z, 1]] && 
   !IntervalMemberQ[Interval[{-Infinity, 0}], Subscript[z, 2]] 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Gamma", "[", RowBox[List[RowBox[List["Conjugate", "[", "a", "]"]], ",", RowBox[List["Conjugate", "[", SubscriptBox["z", "1"], "]"]], ",", RowBox[List["Conjugate", "[", SubscriptBox["z", "2"], "]"]]]], "]"]], "\[Equal]", RowBox[List["Conjugate", "[", RowBox[List["Gamma", "[", RowBox[List["a", ",", SubscriptBox["z", "1"], ",", SubscriptBox["z", "2"]]], "]"]], "]"]]]], "/;", RowBox[List[RowBox[List["Not", "[", RowBox[List["IntervalMemberQ", "[", RowBox[List[RowBox[List["Interval", "[", RowBox[List["{", RowBox[List[RowBox[List["-", "\[Infinity]"]], ",", "0"]], "}"]], "]"]], ",", " ", SubscriptBox["z", "1"]]], "]"]], "]"]], "\[And]", RowBox[List["Not", "[", RowBox[List["IntervalMemberQ", "[", RowBox[List[RowBox[List["Interval", "[", RowBox[List["{", RowBox[List[RowBox[List["-", "\[Infinity]"]], ",", "0"]], "}"]], "]"]], ",", " ", SubscriptBox["z", "2"]]], "]"]], "]"]]]]]]]] 
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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>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mover>  <mi> a </mi>  <mo> _ </mo>  </mover>  <mo> , </mo>  <mover>  <msub>  <mi> z </mi>  <mn> 1 </mn>  </msub>  <mo> _ </mo>  </mover>  <mo> , </mo>  <mover>  <msub>  <mi> z </mi>  <mn> 2 </mn>  </msub>  <mo> _ </mo>  </mover>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mover>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> a </mi>  <mo> , </mo>  <msub>  <mi> z </mi>  <mn> 1 </mn>  </msub>  <mo> , </mo>  <msub>  <mi> z </mi>  <mn> 2 </mn>  </msub>  </mrow>  <mo> ) </mo>  </mrow>  <mo> _ </mo>  </mover>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <msub>  <mi> z </mi>  <mn> 1 </mn>  </msub>  <mo> ∉ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mo> - </mo>  <mi> ∞ </mi>  </mrow>  <mo> , </mo>  <mn> 0 </mn>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mo> ∧ </mo>  <mrow>  <msub>  <mi> z </mi>  <mn> 2 </mn>  </msub>  <mo> ∉ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mo> - </mo>  <mi> ∞ </mi>  </mrow>  <mo> , </mo>  <mn> 0 </mn>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <mrow>  <mrow>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mover>  <mi> a </mi>  <mo> _ </mo>  </mover>  <mo> , </mo>  <mover>  <msub>  <mi> z </mi>  <mn> 1 </mn>  </msub>  <mo> _ </mo>  </mover>  <mo> , </mo>  <mover>  <msub>  <mi> z </mi>  <mn> 2 </mn>  </msub>  <mo> _ </mo>  </mover>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mover>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> a </mi>  <mo> , </mo>  <msub>  <mi> z </mi>  <mn> 1 </mn>  </msub>  <mo> , </mo>  <msub>  <mi> z </mi>  <mn> 2 </mn>  </msub>  </mrow>  <mo> ) </mo>  </mrow>  <mo> _ </mo>  </mover>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <msub>  <mi> z </mi>  <mn> 1 </mn>  </msub>  <mo> ∉ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mo> - </mo>  <mi> ∞ </mi>  </mrow>  <mo> , </mo>  <mn> 0 </mn>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mo> ∧ </mo>  <mrow>  <msub>  <mi> z </mi>  <mn> 2 </mn>  </msub>  <mo> ∉ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mo> - </mo>  <mi> ∞ </mi>  </mrow>  <mo> , </mo>  <mn> 0 </mn>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  </mrow>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Gamma", "[", RowBox[List[RowBox[List["Conjugate", "[", "a_", "]"]], ",", RowBox[List["Conjugate", "[", SubscriptBox["z_", "1"], "]"]], ",", RowBox[List["Conjugate", "[", SubscriptBox["z_", "2"], "]"]]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["Conjugate", "[", RowBox[List["Gamma", "[", RowBox[List["a", ",", SubscriptBox["zz", "1"], ",", SubscriptBox["zz", "2"]]], "]"]], "]"]], "/;", RowBox[List[RowBox[List["!", RowBox[List["IntervalMemberQ", "[", RowBox[List[RowBox[List["Interval", "[", RowBox[List["{", RowBox[List[RowBox[List["-", "\[Infinity]"]], ",", "0"]], "}"]], "]"]], ",", SubscriptBox["zz", "1"]]], "]"]]]], "&&", RowBox[List["!", RowBox[List["IntervalMemberQ", "[", RowBox[List[RowBox[List["Interval", "[", RowBox[List["{", RowBox[List[RowBox[List["-", "\[Infinity]"]], ",", "0"]], "}"]], "]"]], ",", SubscriptBox["zz", "2"]]], "]"]]]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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