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   http://functions.wolfram.com/06.07.04.0001.01
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    DomainAndRange[Function[{a, Subscript[z, 1], Subscript[z, 2]}, 
   Gamma[a, Subscript[z, 1], Subscript[z, 2]]]] == 
 ProductSet[Complexes, Complexes, Complexes] \[LongRightArrow] Complexes 
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   Cell[BoxData[RowBox[List[RowBox[List["DomainAndRange", "[", RowBox[List["Function", "[", RowBox[List[RowBox[List["{", RowBox[List["a", ",", SubscriptBox["z", "1"], ",", SubscriptBox["z", "2"]]], "}"]], ",", RowBox[List["Gamma", "[", RowBox[List["a", ",", SubscriptBox["z", "1"], ",", SubscriptBox["z", "2"]]], "]"]]]], "]"]], "]"]], " ", "\[Equal]", "\[IndentingNewLine]", RowBox[List[RowBox[List["ProductSet", "[", RowBox[List["Complexes", ",", "Complexes", ",", "Complexes"]], "]"]], "\[LongRightArrow]", "Complexes"]]]]]] 
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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>  <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>  <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>  </mrow>  <mo> ∷ </mo>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <mi> ℂ </mi>  <mo> ⊗ </mo>  <mi> ℂ </mi>  <mo> ⊗ </mo>  <mi> ℂ </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⟶ </mo>  <mi> ℂ </mi>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Proportion </ci>  <apply>  <ci> LongRightArrow </ci>  <apply>  <ci> Star </ci>  <ci> a </ci>  <apply>  <ci> Subscript </ci>  <ci> z </ci>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <ci> Subscript </ci>  <ci> z </ci>  <cn type='integer'> 2 </cn>  </apply>  </apply>  <apply>  <ci> Gamma </ci>  <ci> a </ci>  <apply>  <ci> Subscript </ci>  <ci> z </ci>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <ci> Subscript </ci>  <ci> z </ci>  <cn type='integer'> 2 </cn>  </apply>  </apply>  </apply>  <apply>  <ci> LongRightArrow </ci>  <apply>  <ci> CircleTimes </ci>  <ci> ℂ </ci>  <ci> ℂ </ci>  <ci> ℂ </ci>  </apply>  <ci> ℂ </ci>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["DomainAndRange", "[", RowBox[List["Function", "[", RowBox[List[RowBox[List["{", RowBox[List["a_", ",", SubscriptBox["z_", "1"], ",", SubscriptBox["z_", "2"]]], "}"]], ",", RowBox[List["Gamma", "[", RowBox[List["a_", ",", SubscriptBox["z_", "1"], ",", SubscriptBox["z_", "2"]]], "]"]]]], "]"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["ProductSet", "[", RowBox[List["Complexes", ",", "Complexes", ",", "Complexes"]], "]"]], "\[LongRightArrow]", "Complexes"]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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