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   http://functions.wolfram.com/07.12.06.0008.01
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    LegendreQ[\[Nu], \[Mu], 3, z] \[Proportional] 
  (2^(\[Mu]/2 - 1) E^(Pi I \[Mu]) Gamma[\[Mu]] (1 + O[z - 1]))/
    (z - 1)^(\[Mu]/2) + ((2^(-\[Mu]/2 - 1) E^(Pi I \[Mu]) 
      Gamma[1 + \[Mu] + \[Nu]] Gamma[-\[Mu]])/Gamma[1 - \[Mu] + \[Nu]]) 
    (z - 1)^(\[Mu]/2) (1 + O[z - 1]) /; (z -> 1) &&  !Element[\[Mu], Integers] 
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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>  <mstyle scriptlevel='0'>  <msubsup>  <semantics>  <mi> 𝔔 </mi>  <annotation encoding='Mathematica'> TagBox["\[GothicCapitalQ]", LegendreQ] </annotation>  </semantics>  <mi> ν </mi>  <mi> μ </mi>  </msubsup>  </mstyle>  <mo> ( </mo>  <mstyle scriptlevel='0'>  <mi> z </mi>  </mstyle>  <mstyle scriptlevel='0'>  <mo> ) </mo>  </mstyle>  </mrow>  <mo> ∝ </mo>  <mrow>  <mrow>  <mfrac>  <mrow>  <msup>  <mn> 2 </mn>  <mrow>  <mrow>  <mo> - </mo>  <mfrac>  <mi> μ </mi>  <mn> 2 </mn>  </mfrac>  </mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msup>  <mo> ⁢ </mo>  <msup>  <mi> ⅇ </mi>  <mrow>  <mi> π </mi>  <mo> ⁢ </mo>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> μ </mi>  </mrow>  </msup>  <mo> ⁢ </mo>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> μ </mi>  <mo> + </mo>  <mi> ν </mi>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mo> - </mo>  <mi> μ </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mtext>   </mtext>  </mrow>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> ν </mi>  <mo> - </mo>  <mi> μ </mi>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mrow>  <mi> μ </mi>  <mo> / </mo>  <mn> 2 </mn>  </mrow>  </msup>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mn> 1 </mn>  <mo> + </mo>  <mrow>  <mi> O </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mtext>   </mtext>  <mo> + </mo>  <mrow>  <msup>  <mn> 2 </mn>  <mrow>  <mfrac>  <mi> μ </mi>  <mn> 2 </mn>  </mfrac>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msup>  <mo> ⁢ </mo>  <msup>  <mi> ⅇ </mi>  <mrow>  <mi> π </mi>  <mo> ⁢ </mo>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> μ </mi>  </mrow>  </msup>  <mo> ⁢ </mo>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> μ </mi>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <msup>  <mrow>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mrow>  <mrow>  <mo> - </mo>  <mi> μ </mi>  </mrow>  <mo> / </mo>  <mn> 2 </mn>  </mrow>  </msup>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mn> 1 </mn>  <mo> + </mo>  <mrow>  <mi> O </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  </mrow>  <mtext>   </mtext>  <mo> /; </mo>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <semantics>  <mo> → </mo>  <annotation encoding='Mathematica'> "\[Rule]" </annotation>  </semantics>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ∧ </mo>  <mrow>  <mi> μ </mi>  <mo> ∉ </mo>  <semantics>  <mi> ℤ </mi>  <annotation encoding='Mathematica'> TagBox["\[DoubleStruckCapitalZ]", Function[Integers]] </annotation>  </semantics>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <ci> Proportional </ci>  <apply>  <apply>  <power />  <apply>  <ci> Subscript </ci>  <apply>  <ci> LegendreQ </ci>  <ci> 𝔔 </ci>  </apply>  <ci> ν </ci>  </apply>  <ci> μ </ci>  </apply>  <ci> z </ci>  </apply>  <apply>  <plus />  <apply>  <times />  <apply>  <times />  <apply>  <power />  <cn type='integer'> 2 </cn>  <apply>  <plus />  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <ci> μ </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <power />  <exponentiale />  <apply>  <times />  <pi />  <imaginaryi />  <ci> μ </ci>  </apply>  </apply>  <apply>  <ci> Gamma </ci>  <apply>  <plus />  <ci> μ </ci>  <ci> ν </ci>  <cn type='integer'> 1 </cn>  </apply>  </apply>  <apply>  <ci> Gamma </ci>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> μ </ci>  </apply>  </apply>  <apply>  <power />  <apply>  <ci> Gamma </ci>  <apply>  <plus />  <ci> ν </ci>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> μ </ci>  </apply>  <cn type='integer'> 1 </cn>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <power />  <apply>  <plus />  <ci> z </ci>  <cn type='integer'> -1 </cn>  </apply>  <apply>  <times />  <ci> μ </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <ci> O </ci>  <apply>  <plus />  <ci> z </ci>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <times />  <apply>  <power />  <cn type='integer'> 2 </cn>  <apply>  <plus />  <apply>  <times />  <ci> μ </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <apply>  <power />  <exponentiale />  <apply>  <times />  <pi />  <imaginaryi />  <ci> μ </ci>  </apply>  </apply>  <apply>  <ci> Gamma </ci>  <ci> μ </ci>  </apply>  <apply>  <power />  <apply>  <plus />  <ci> z </ci>  <cn type='integer'> -1 </cn>  </apply>  <apply>  <times />  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> μ </ci>  </apply>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <ci> O </ci>  <apply>  <plus />  <ci> z </ci>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  <apply>  <and />  <apply>  <ci> Rule </ci>  <ci> z </ci>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <notin />  <ci> μ </ci>  <integers />  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["LegendreQ", "[", RowBox[List["\[Nu]_", ",", "\[Mu]_", ",", "3", ",", "z_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List[RowBox[List[SuperscriptBox["2", RowBox[List[FractionBox["\[Mu]", "2"], "-", "1"]]], " ", SuperscriptBox["\[ExponentialE]", RowBox[List["\[Pi]", " ", "\[ImaginaryI]", " ", "\[Mu]"]]], " ", RowBox[List["Gamma", "[", "\[Mu]", "]"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["z", "-", "1"]], ")"]], RowBox[List["-", FractionBox["\[Mu]", "2"]]]], " ", RowBox[List["(", RowBox[List["1", "+", RowBox[List["O", "[", RowBox[List["z", "-", "1"]], "]"]]]], ")"]]]], "+", FractionBox[RowBox[List[RowBox[List["(", RowBox[List[SuperscriptBox["2", RowBox[List[RowBox[List["-", FractionBox["\[Mu]", "2"]]], "-", "1"]]], " ", SuperscriptBox["\[ExponentialE]", RowBox[List["\[Pi]", " ", "\[ImaginaryI]", " ", "\[Mu]"]]], " ", RowBox[List["Gamma", "[", RowBox[List["1", "+", "\[Mu]", "+", "\[Nu]"]], "]"]], " ", RowBox[List["Gamma", "[", RowBox[List["-", "\[Mu]"]], "]"]]]], ")"]], " ", SuperscriptBox[RowBox[List["(", RowBox[List["z", "-", "1"]], ")"]], RowBox[List["\[Mu]", "/", "2"]]], " ", RowBox[List["(", RowBox[List["1", "+", RowBox[List["O", "[", RowBox[List["z", "-", "1"]], "]"]]]], ")"]]]], RowBox[List["Gamma", "[", RowBox[List["1", "-", "\[Mu]", "+", "\[Nu]"]], "]"]]]]], "/;", RowBox[List[RowBox[List["(", RowBox[List["z", "\[Rule]", "1"]], ")"]], "&&", RowBox[List["!", RowBox[List["\[Mu]", "\[Element]", "Integers"]]]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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