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   http://functions.wolfram.com/06.22.03.0009.02
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    BetaRegularized[0, Subscript[z, 2], a, b] == ComplexInfinity /; Re[a] < 0 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["BetaRegularized", "[", RowBox[List["0", ",", SubscriptBox["z", "2"], ",", "a", ",", "b"]], "]"]], "\[Equal]", "ComplexInfinity"]], "/;", RowBox[List[RowBox[List["Re", "[", "a", "]"]], "<", "0"]]]]]] 
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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>  <mrow>  <mo> ( </mo>  <mrow>  <mn> 0 </mn>  <mo> , </mo>  <msub>  <mi> z </mi>  <mn> 2 </mn>  </msub>  </mrow>  <mo> ) </mo>  </mrow>  </msub>  <mo> ( </mo>  <mrow>  <mi> a </mi>  <mo> , </mo>  <mi> b </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mover>  <mi> ∞ </mi>  <mo> ~ </mo>  </mover>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <mi> Re </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> a </mi>  <mo> ) </mo>  </mrow>  <mo> < </mo>  <mn> 0 </mn>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <ci> BetaRegularized </ci>  <cn type='integer'> 0 </cn>  <apply>  <ci> Subscript </ci>  <ci> z </ci>  <cn type='integer'> 2 </cn>  </apply>  <ci> a </ci>  <ci> b </ci>  </apply>  <apply>  <ci> OverTilde </ci>  <infinity />  </apply>  </apply>  <apply>  <lt />  <apply>  <real />  <ci> a </ci>  </apply>  <cn type='integer'> 0 </cn>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["BetaRegularized", "[", RowBox[List["0", ",", SubscriptBox["z_", "2"], ",", "a_", ",", "b_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["ComplexInfinity", "/;", RowBox[List[RowBox[List["Re", "[", "a", "]"]], "<", "0"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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