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   http://functions.wolfram.com/07.23.03.0103.01
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    Hypergeometric2F1[a, b, (a + b)/2 + 1, z] == 
  (1/(z (b - a))) Gamma[(a + b)/2 + 1] (z^2 - z)^((2 - a - b)/4) 
   (LegendreP[(a - b)/2, 1 - (a + b)/2, 3, 1 - 2 z] - 
    LegendreP[(a - b)/2 - 1, 1 - (a + b)/2, 3, 1 - 2 z]) /; Re[z] <= 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>  <semantics>  <mrow>  <mrow>  <msub>  <mo>   </mo>  <mn> 2 </mn>  </msub>  <msub>  <mi> F </mi>  <mn> 1 </mn>  </msub>  </mrow>  <mo> ⁡ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mi> a </mi>  <mo> , </mo>  <mi> b </mi>  </mrow>  <mo> ; </mo>  <mrow>  <mfrac>  <mrow>  <mi> a </mi>  <mo> + </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ; </mo>  <mi> z </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <annotation encoding='Mathematica'> TagBox[TagBox[RowBox[List[RowBox[List[SubscriptBox["\[InvisiblePrefixScriptBase]", FormBox["2", TraditionalForm]], SubscriptBox["F", FormBox["1", TraditionalForm]]]], "\[InvisibleApplication]", RowBox[List["(", RowBox[List[TagBox[TagBox[RowBox[List[TagBox["a", Hypergeometric2F1, Rule[Editable, True]], ",", TagBox["b", Hypergeometric2F1, Rule[Editable, True]]]], InterpretTemplate[Function[List[SlotSequence[1]]]]], Hypergeometric2F1, Rule[Editable, False]], ";", TagBox[TagBox[TagBox[RowBox[List[FractionBox[RowBox[List["a", "+", "b"]], "2"], "+", "1"]], Hypergeometric2F1, Rule[Editable, True]], InterpretTemplate[Function[List[SlotSequence[1]]]]], Hypergeometric2F1, Rule[Editable, False]], ";", TagBox["z", Hypergeometric2F1, Rule[Editable, True]]]], ")"]]]], InterpretTemplate[Function[HypergeometricPFQ[Slot[1], Slot[2], Slot[3]]]], Rule[Editable, False]], Hypergeometric2F1] </annotation>  </semantics>  <mo> ⩵ </mo>  <mrow>  <mfrac>  <mrow>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mfrac>  <mrow>  <mi> a </mi>  <mo> + </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mtext>   </mtext>  </mrow>  <mrow>  <mi> z </mi>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mi> b </mi>  <mo> - </mo>  <mi> a </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <msup>  <mi> z </mi>  <mn> 2 </mn>  </msup>  <mo> - </mo>  <mi> z </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mfrac>  <mrow>  <mn> 2 </mn>  <mo> - </mo>  <mi> a </mi>  <mo> - </mo>  <mi> b </mi>  </mrow>  <mn> 4 </mn>  </mfrac>  </msup>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mtext>   </mtext>  <semantics>  <mrow>  <mrow>  <mstyle scriptlevel='0'>  <msubsup>  <mi> 𝔓 </mi>  <mfrac>  <mrow>  <mi> a </mi>  <mo> - </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mfrac>  <mrow>  <mi> a </mi>  <mo> + </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  </mrow>  </msubsup>  </mstyle>  <mo> ( </mo>  <mstyle scriptlevel='0'>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  </mrow>  </mstyle>  <mo> ) </mo>  </mrow>  <mo> - </mo>  <mrow>  <mstyle scriptlevel='0'>  <msubsup>  <mi> 𝔓 </mi>  <mrow>  <mfrac>  <mrow>  <mi> a </mi>  <mo> - </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mfrac>  <mrow>  <mi> a </mi>  <mo> + </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  </mrow>  </msubsup>  </mstyle>  <mo> ( </mo>  <mstyle scriptlevel='0'>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  </mrow>  </mstyle>  <mstyle scriptlevel='0'>  <mo> ) </mo>  </mstyle>  </mrow>  </mrow>  <annotation encoding='Mathematica'> TagBox[RowBox[List[RowBox[List[StyleBox[SubsuperscriptBox[TagBox["\[GothicCapitalP]", LegendreQ], FractionBox[RowBox[List["a", "-", "b"]], "2"], RowBox[List["1", "-", FractionBox[RowBox[List["a", "+", "b"]], "2"]]]], Rule[ScriptLevel, 0]], "(", StyleBox[RowBox[List["1", "-", RowBox[List["2", "z"]]]], Rule[ScriptLevel, 0]], ")"]], "-", TagBox[RowBox[List[StyleBox[SubsuperscriptBox[TagBox["\[GothicCapitalP]", LegendreQ], RowBox[List[FractionBox[RowBox[List["a", "-", "b"]], "2"], "-", "1"]], RowBox[List["1", "-", FractionBox[RowBox[List["a", "+", "b"]], "2"]]]], Rule[ScriptLevel, 0]], "(", StyleBox[RowBox[List["1", "-", RowBox[List["2", "z"]]]], Rule[ScriptLevel, 0]], StyleBox[")", Rule[ScriptLevel, 0]]]], LegendreP]]], LegendreP] </annotation>  </semantics>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <mi> Re </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ≤ </mo>  <mn> 0 </mn>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <mrow>  <mrow>  <semantics>  <mrow>  <mrow>  <msub>  <mo>   </mo>  <mn> 2 </mn>  </msub>  <msub>  <mi> F </mi>  <mn> 1 </mn>  </msub>  </mrow>  <mo> ⁡ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mi> a </mi>  <mo> , </mo>  <mi> b </mi>  </mrow>  <mo> ; </mo>  <mrow>  <mfrac>  <mrow>  <mi> a </mi>  <mo> + </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ; </mo>  <mi> z </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <annotation encoding='Mathematica'> TagBox[TagBox[RowBox[List[RowBox[List[SubscriptBox["\[InvisiblePrefixScriptBase]", FormBox["2", TraditionalForm]], SubscriptBox["F", FormBox["1", TraditionalForm]]]], "\[InvisibleApplication]", RowBox[List["(", RowBox[List[TagBox[TagBox[RowBox[List[TagBox["a", Hypergeometric2F1, Rule[Editable, True]], ",", TagBox["b", Hypergeometric2F1, Rule[Editable, True]]]], InterpretTemplate[Function[List[SlotSequence[1]]]]], Hypergeometric2F1, Rule[Editable, False]], ";", TagBox[TagBox[TagBox[RowBox[List[FractionBox[RowBox[List["a", "+", "b"]], "2"], "+", "1"]], Hypergeometric2F1, Rule[Editable, True]], InterpretTemplate[Function[List[SlotSequence[1]]]]], Hypergeometric2F1, Rule[Editable, False]], ";", TagBox["z", Hypergeometric2F1, Rule[Editable, True]]]], ")"]]]], InterpretTemplate[Function[HypergeometricPFQ[Slot[1], Slot[2], Slot[3]]]], Rule[Editable, False]], Hypergeometric2F1] </annotation>  </semantics>  <mo> ⩵ </mo>  <mrow>  <mfrac>  <mrow>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mfrac>  <mrow>  <mi> a </mi>  <mo> + </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mtext>   </mtext>  </mrow>  <mrow>  <mi> z </mi>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mi> b </mi>  <mo> - </mo>  <mi> a </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <msup>  <mi> z </mi>  <mn> 2 </mn>  </msup>  <mo> - </mo>  <mi> z </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mfrac>  <mrow>  <mn> 2 </mn>  <mo> - </mo>  <mi> a </mi>  <mo> - </mo>  <mi> b </mi>  </mrow>  <mn> 4 </mn>  </mfrac>  </msup>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mtext>   </mtext>  <semantics>  <mrow>  <mrow>  <mstyle scriptlevel='0'>  <msubsup>  <mi> 𝔓 </mi>  <mfrac>  <mrow>  <mi> a </mi>  <mo> - </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mfrac>  <mrow>  <mi> a </mi>  <mo> + </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  </mrow>  </msubsup>  </mstyle>  <mo> ( </mo>  <mstyle scriptlevel='0'>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  </mrow>  </mstyle>  <mo> ) </mo>  </mrow>  <mo> - </mo>  <mrow>  <mstyle scriptlevel='0'>  <msubsup>  <mi> 𝔓 </mi>  <mrow>  <mfrac>  <mrow>  <mi> a </mi>  <mo> - </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mfrac>  <mrow>  <mi> a </mi>  <mo> + </mo>  <mi> b </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  </mrow>  </msubsup>  </mstyle>  <mo> ( </mo>  <mstyle scriptlevel='0'>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> z </mi>  </mrow>  </mrow>  </mstyle>  <mstyle scriptlevel='0'>  <mo> ) </mo>  </mstyle>  </mrow>  </mrow>  <annotation encoding='Mathematica'> TagBox[RowBox[List[RowBox[List[StyleBox[SubsuperscriptBox[TagBox["\[GothicCapitalP]", LegendreQ], FractionBox[RowBox[List["a", "-", "b"]], "2"], RowBox[List["1", "-", FractionBox[RowBox[List["a", "+", "b"]], "2"]]]], Rule[ScriptLevel, 0]], "(", StyleBox[RowBox[List["1", "-", RowBox[List["2", "z"]]]], Rule[ScriptLevel, 0]], ")"]], "-", TagBox[RowBox[List[StyleBox[SubsuperscriptBox[TagBox["\[GothicCapitalP]", LegendreQ], RowBox[List[FractionBox[RowBox[List["a", "-", "b"]], "2"], "-", "1"]], RowBox[List["1", "-", FractionBox[RowBox[List["a", "+", "b"]], "2"]]]], Rule[ScriptLevel, 0]], "(", StyleBox[RowBox[List["1", "-", RowBox[List["2", "z"]]]], Rule[ScriptLevel, 0]], StyleBox[")", Rule[ScriptLevel, 0]]]], LegendreP]]], LegendreP] </annotation>  </semantics>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <mi> Re </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ≤ </mo>  <mn> 0 </mn>  </mrow>  </mrow>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Hypergeometric2F1", "[", RowBox[List["a_", ",", "b_", ",", RowBox[List[FractionBox[RowBox[List["a_", "+", "b_"]], "2"], "+", "1"]], ",", "z_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox[RowBox[List[RowBox[List["Gamma", "[", RowBox[List[FractionBox[RowBox[List["a", "+", "b"]], "2"], "+", "1"]], "]"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List[SuperscriptBox["z", "2"], "-", "z"]], ")"]], RowBox[List[FractionBox["1", "4"], " ", RowBox[List["(", RowBox[List["2", "-", "a", "-", "b"]], ")"]]]]], " ", RowBox[List["(", RowBox[List[RowBox[List["LegendreP", "[", RowBox[List[FractionBox[RowBox[List["a", "-", "b"]], "2"], ",", RowBox[List["1", "-", FractionBox[RowBox[List["a", "+", "b"]], "2"]]], ",", "3", ",", RowBox[List["1", "-", RowBox[List["2", " ", "z"]]]]]], "]"]], "-", RowBox[List["LegendreP", "[", RowBox[List[RowBox[List[FractionBox[RowBox[List["a", "-", "b"]], "2"], "-", "1"]], ",", RowBox[List["1", "-", FractionBox[RowBox[List["a", "+", "b"]], "2"]]], ",", "3", ",", RowBox[List["1", "-", RowBox[List["2", " ", "z"]]]]]], "]"]]]], ")"]]]], RowBox[List["z", " ", RowBox[List["(", RowBox[List["b", "-", "a"]], ")"]]]]], "/;", RowBox[List[RowBox[List["Re", "[", "z", "]"]], "\[LessEqual]", "0"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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| HypergeometricPFQ[{},{},z] |  | HypergeometricPFQ[{},{b},z] |  | HypergeometricPFQ[{a},{},z] |  | HypergeometricPFQ[{a},{b},z] |  | HypergeometricPFQ[{a1},{b1,b2},z] |  | HypergeometricPFQ[{a1,a2},{b1,b2},z] |  | HypergeometricPFQ[{a1,a2},{b1,b2,b3},z] |  | HypergeometricPFQ[{a1,a2,a3},{b1,b2},z] |  | HypergeometricPFQ[{a1,a2,a3,a4},{b1,b2,b3},z] |  | HypergeometricPFQ[{a1,a2,a3,a4,a5},{b1,b2,b3,b4},z] |  | HypergeometricPFQ[{a1,a2,a3,a4,a5,a6},{b1,b2,b3,b4,b5},z] |  | HypergeometricPFQ[{a1,...,ap},{b1,...,bq},z] |  |   |  
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