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   http://functions.wolfram.com/05.10.26.0002.01
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    SphericalHarmonicY[n, m, \[CurlyTheta], \[CurlyPhi]] == 
  (1/(2 Gamma[1 - m])) Sqrt[(2 n + 1)/Pi] (Sqrt[Gamma[n - m + 1]]/
    Sqrt[Gamma[n + m + 1]]) E^(I \[CurlyPhi] m) 
   ((Cos[\[CurlyTheta]/2]^2)^(m/2)/(Sin[\[CurlyTheta]/2]^2)^(m/2)) 
   Hypergeometric2F1[-n, n + 1, 1 - m, Sin[\[CurlyTheta]/2]^2] /; 
  !(Element[m, Integers] && m > 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>  <msubsup>  <mi> Y </mi>  <mi> n </mi>  <mi> m </mi>  </msubsup>  <mo> ( </mo>  <mrow>  <mi> ϑ </mi>  <mo> , </mo>  <mi> φ </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mfrac>  <mn> 1 </mn>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <msqrt>  <mfrac>  <mrow>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> n </mi>  </mrow>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mi> π </mi>  </mfrac>  </msqrt>  <mo> ⁢ </mo>  <mfrac>  <msqrt>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> n </mi>  <mo> - </mo>  <mi> m </mi>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  </msqrt>  <msqrt>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> n </mi>  <mo> + </mo>  <mi> m </mi>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  </msqrt>  </mfrac>  <mo> ⁢ </mo>  <msup>  <mi> ⅇ </mi>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> φ </mi>  <mo> ⁢ </mo>  <mi> m </mi>  </mrow>  </msup>  <mo> ⁢ </mo>  <mfrac>  <msup>  <mrow>  <msup>  <mi> cos </mi>  <mn> 2 </mn>  </msup>  <mo> ( </mo>  <mfrac>  <mi> ϑ </mi>  <mn> 2 </mn>  </mfrac>  <mo> ) </mo>  </mrow>  <mrow>  <mi> m </mi>  <mo> / </mo>  <mn> 2 </mn>  </mrow>  </msup>  <msup>  <mrow>  <msup>  <mi> sin </mi>  <mn> 2 </mn>  </msup>  <mo> ( </mo>  <mfrac>  <mi> ϑ </mi>  <mn> 2 </mn>  </mfrac>  <mo> ) </mo>  </mrow>  <mrow>  <mi> m </mi>  <mo> / </mo>  <mn> 2 </mn>  </mrow>  </msup>  </mfrac>  <mo> ⁢ </mo>  <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>  <mrow>  <mo> - </mo>  <mi> n </mi>  </mrow>  <mo> , </mo>  <mrow>  <mi> n </mi>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  </mrow>  <mo> ; </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <mi> m </mi>  </mrow>  <mo> ; </mo>  <mrow>  <msup>  <mi> sin </mi>  <mn> 2 </mn>  </msup>  <mo> ( </mo>  <mfrac>  <mi> ϑ </mi>  <mn> 2 </mn>  </mfrac>  <mo> ) </mo>  </mrow>  </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[RowBox[List["-", "n"]], Hypergeometric2F1, Rule[Editable, True]], ",", TagBox[RowBox[List["n", "+", "1"]], Hypergeometric2F1, Rule[Editable, True]]]], InterpretTemplate[Function[List[SlotSequence[1]]]]], Hypergeometric2F1, Rule[Editable, False]], ";", TagBox[TagBox[TagBox[RowBox[List["1", "-", "m"]], Hypergeometric2F1, Rule[Editable, True]], InterpretTemplate[Function[List[SlotSequence[1]]]]], Hypergeometric2F1, Rule[Editable, False]], ";", TagBox[RowBox[List[SuperscriptBox["sin", "2"], "(", FractionBox["\[CurlyTheta]", "2"], ")"]], Hypergeometric2F1, Rule[Editable, True]]]], ")"]]]], InterpretTemplate[Function[HypergeometricPFQ[Slot[1], Slot[2], Slot[3]]]], Rule[Editable, False]], Hypergeometric2F1] </annotation>  </semantics>  </mrow>  </mrow>  <mo> /; </mo>  <mrow>  <mi> m </mi>  <mo> ∉ </mo>  <msup>  <mi> ℕ </mi>  <mo> + </mo>  </msup>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <ci> SphericalHarmonicY </ci>  <ci> n </ci>  <ci> m </ci>  <ci> ϑ </ci>  <ci> φ </ci>  </apply>  <apply>  <times />  <apply>  <times />  <cn type='integer'> 1 </cn>  <apply>  <power />  <apply>  <times />  <cn type='integer'> 2 </cn>  <apply>  <ci> Gamma </ci>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> m </ci>  </apply>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <power />  <apply>  <times />  <apply>  <plus />  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> n </ci>  </apply>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <power />  <pi />  <cn type='integer'> -1 </cn>  </apply>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  <apply>  <times />  <apply>  <power />  <apply>  <ci> Gamma </ci>  <apply>  <plus />  <ci> n </ci>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> m </ci>  </apply>  <cn type='integer'> 1 </cn>  </apply>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  <apply>  <power />  <apply>  <power />  <apply>  <ci> Gamma </ci>  <apply>  <plus />  <ci> n </ci>  <ci> m </ci>  <cn type='integer'> 1 </cn>  </apply>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <power />  <exponentiale />  <apply>  <times />  <imaginaryi />  <ci> φ </ci>  <ci> m </ci>  </apply>  </apply>  <apply>  <times />  <apply>  <power />  <apply>  <power />  <apply>  <cos />  <apply>  <times />  <ci> ϑ </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <cn type='integer'> 2 </cn>  </apply>  <apply>  <times />  <ci> m </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <power />  <apply>  <power />  <apply>  <power />  <apply>  <sin />  <apply>  <times />  <ci> ϑ </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <cn type='integer'> 2 </cn>  </apply>  <apply>  <times />  <ci> m </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <ci> Hypergeometric2F1 </ci>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> n </ci>  </apply>  <apply>  <plus />  <ci> n </ci>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> m </ci>  </apply>  </apply>  <apply>  <power />  <apply>  <sin />  <apply>  <times />  <ci> ϑ </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <cn type='integer'> 2 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <notin />  <ci> m </ci>  <apply>  <ci> SuperPlus </ci>  <ci> ℕ </ci>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["SphericalHarmonicY", "[", RowBox[List["n_", ",", "m_", ",", "\[CurlyTheta]_", ",", "\[CurlyPhi]_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox[RowBox[List[SqrtBox[FractionBox[RowBox[List[RowBox[List["2", " ", "n"]], "+", "1"]], "\[Pi]"]], " ", SqrtBox[RowBox[List["Gamma", "[", RowBox[List["n", "-", "m", "+", "1"]], "]"]]], " ", SuperscriptBox["\[ExponentialE]", RowBox[List["\[ImaginaryI]", " ", "\[CurlyPhi]", " ", "m"]]], " ", SuperscriptBox[RowBox[List["(", SuperscriptBox[RowBox[List["Cos", "[", FractionBox["\[CurlyTheta]", "2"], "]"]], "2"], ")"]], RowBox[List["m", "/", "2"]]], " ", RowBox[List["Hypergeometric2F1", "[", RowBox[List[RowBox[List["-", "n"]], ",", RowBox[List["n", "+", "1"]], ",", RowBox[List["1", "-", "m"]], ",", SuperscriptBox[RowBox[List["Sin", "[", FractionBox["\[CurlyTheta]", "2"], "]"]], "2"]]], "]"]]]], RowBox[List[RowBox[List["(", RowBox[List["2", " ", RowBox[List["Gamma", "[", RowBox[List["1", "-", "m"]], "]"]]]], ")"]], " ", SqrtBox[RowBox[List["Gamma", "[", RowBox[List["n", "+", "m", "+", "1"]], "]"]]], " ", SuperscriptBox[RowBox[List["(", SuperscriptBox[RowBox[List["Sin", "[", FractionBox["\[CurlyTheta]", "2"], "]"]], "2"], ")"]], RowBox[List["m", "/", "2"]]]]]], "/;", RowBox[List["!", RowBox[List["(", RowBox[List[RowBox[List["m", "\[Element]", "Integers"]], "&&", RowBox[List["m", ">", "0"]]]], ")"]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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