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   http://functions.wolfram.com/06.21.03.0003.01
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    BetaRegularized[z, -n, b] == ComplexInfinity /; 
 Element[n, Integers] && n >= 0 &&  !(Element[b, Integers] && b > 0 && b <= n) 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["BetaRegularized", "[", RowBox[List["z", ",", RowBox[List["-", "n"]], ",", "b"]], "]"]], "\[Equal]", InterpretationBox["1", DirectedInfinity[]]]], "/;", RowBox[List[RowBox[List["n", "\[Element]", "Integers"]], "\[And]", RowBox[List["n", "\[GreaterEqual]", "0"]], "\[And]", RowBox[List["Not", "[", RowBox[List[RowBox[List["b", "\[Element]", "Integers"]], "\[And]", RowBox[List["b", ">", "0"]], "\[And]", RowBox[List["b", "\[LessEqual]", "n"]]]], "]"]]]]]]]] 
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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>  <semantics>  <mi> I </mi>  <annotation-xml encoding='MathML-Content'>  <ci> BetaRegularized </ci>  </annotation-xml>  </semantics>  <mi> z </mi>  </msub>  <mo> ( </mo>  <mrow>  <mrow>  <mo> - </mo>  <mi> n </mi>  </mrow>  <mo> , </mo>  <mi> b </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mn> 1 </mn>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <mi> n </mi>  <mo> ∈ </mo>  <mi> ℕ </mi>  </mrow>  <mo> ∧ </mo>  <mrow>  <mo> ¬ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mi> b </mi>  <mo> ∈ </mo>  <msup>  <mi> ℕ </mi>  <mo> + </mo>  </msup>  </mrow>  <mo> ∧ </mo>  <mrow>  <mi> b </mi>  <mo> ≤ </mo>  <mi> n </mi>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <ci> BetaRegularized </ci>  <ci> z </ci>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> n </ci>  </apply>  <ci> b </ci>  </apply>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <and />  <apply>  <in />  <ci> n </ci>  <ci> ℕ </ci>  </apply>  <apply>  <not />  <apply>  <and />  <apply>  <in />  <ci> b </ci>  <apply>  <ci> SuperPlus </ci>  <ci> ℕ </ci>  </apply>  </apply>  <apply>  <leq />  <ci> b </ci>  <ci> n </ci>  </apply>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["BetaRegularized", "[", RowBox[List["z_", ",", RowBox[List["-", "n_"]], ",", "b_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["ComplexInfinity", "/;", RowBox[List[RowBox[List["n", "\[Element]", "Integers"]], "&&", RowBox[List["n", "\[GreaterEqual]", "0"]], "&&", RowBox[List["!", RowBox[List["(", RowBox[List[RowBox[List["b", "\[Element]", "Integers"]], "&&", RowBox[List["b", ">", "0"]], "&&", RowBox[List["b", "\[LessEqual]", "n"]]]], ")"]]]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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