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   http://functions.wolfram.com/07.41.16.0005.01
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    ParabolicCylinderD[\[Nu], -z] == ParabolicCylinderD[\[Nu], z] - 
  (2^((1 + \[Nu])/2) z Gamma[(1 + \[Nu])/2] Sin[(Pi \[Nu])/2] 
    LaguerreL[(\[Nu] - 1)/2, 1/2, z^2/2])/E^(z^2/4) 
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   Cell[BoxData[RowBox[List[RowBox[List["ParabolicCylinderD", "[", RowBox[List["\[Nu]", ",", RowBox[List["-", "z"]]]], "]"]], "\[Equal]", RowBox[List[RowBox[List["ParabolicCylinderD", "[", RowBox[List["\[Nu]", ",", "z"]], "]"]], "-", RowBox[List[SuperscriptBox["2", FractionBox[RowBox[List["1", "+", "\[Nu]"]], "2"]], " ", "z", "  ", SuperscriptBox["\[ExponentialE]", RowBox[List["-", FractionBox[SuperscriptBox["z", "2"], "4"]]]], RowBox[List["Gamma", "[", FractionBox[RowBox[List["1", "+", "\[Nu]"]], "2"], "]"]], " ", RowBox[List["Sin", "[", FractionBox[RowBox[List["\[Pi]", " ", "\[Nu]"]], "2"], "]"]], RowBox[List["LaguerreL", "[", RowBox[List[FractionBox[RowBox[List["\[Nu]", "-", "1"]], "2"], ",", FractionBox["1", "2"], ",", FractionBox[SuperscriptBox["z", "2"], "2"]]], "]"]]]]]]]]]] 
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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>  <msub>  <semantics>  <mi> D </mi>  <annotation encoding='Mathematica'> TagBox["D", ParabolicCylinderD] </annotation>  </semantics>  <mi> ν </mi>  </msub>  <mo> ( </mo>  <mrow>  <mo> - </mo>  <mi> z </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo>  </mo>  <mrow>  <mrow>  <msub>  <semantics>  <mi> D </mi>  <annotation encoding='Mathematica'> TagBox["D", ParabolicCylinderD] </annotation>  </semantics>  <mi> ν </mi>  </msub>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> - </mo>  <mrow>  <msup>  <mn> 2 </mn>  <mfrac>  <mrow>  <mi> ν </mi>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mn> 2 </mn>  </mfrac>  </msup>  <mo> ⁢ </mo>  <mi> z </mi>  <mo> ⁢ </mo>  <msup>  <mi> ⅇ </mi>  <mrow>  <mo> - </mo>  <mfrac>  <msup>  <mi> z </mi>  <mn> 2 </mn>  </msup>  <mn> 4 </mn>  </mfrac>  </mrow>  </msup>  <mo> ⁢ </mo>  <mrow>  <mi> Γ </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mfrac>  <mrow>  <mi> ν </mi>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mn> 2 </mn>  </mfrac>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mi> sin </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mfrac>  <mrow>  <mi> π </mi>  <mo> ⁢ </mo>  <mi> ν </mi>  </mrow>  <mn> 2 </mn>  </mfrac>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <msubsup>  <mi> L </mi>  <mfrac>  <mrow>  <mi> ν </mi>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  <mn> 2 </mn>  </mfrac>  <mfrac>  <mn> 1 </mn>  <mn> 2 </mn>  </mfrac>  </msubsup>  <mo> ( </mo>  <mfrac>  <msup>  <mi> z </mi>  <mn> 2 </mn>  </msup>  <mn> 2 </mn>  </mfrac>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <ci> ParabolicCylinderD </ci>  <ci> ν </ci>  <apply>  <times />  <cn type='integer'> -1 </cn>  <ci> z </ci>  </apply>  </apply>  <apply>  <plus />  <apply>  <ci> ParabolicCylinderD </ci>  <ci> ν </ci>  <ci> z </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <apply>  <power />  <cn type='integer'> 2 </cn>  <apply>  <times />  <apply>  <plus />  <ci> ν </ci>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <ci> z </ci>  <apply>  <power />  <exponentiale />  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <apply>  <power />  <ci> z </ci>  <cn type='integer'> 2 </cn>  </apply>  <apply>  <power />  <cn type='integer'> 4 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  <apply>  <ci> Gamma </ci>  <apply>  <times />  <apply>  <plus />  <ci> ν </ci>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <sin />  <apply>  <times />  <pi />  <ci> ν </ci>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  <apply>  <ci> LaguerreL </ci>  <apply>  <times />  <apply>  <plus />  <ci> ν </ci>  <cn type='integer'> -1 </cn>  </apply>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  <cn type='rational'> 1 <sep /> 2 </cn>  <apply>  <times />  <apply>  <power />  <ci> z </ci>  <cn type='integer'> 2 </cn>  </apply>  <apply>  <power />  <cn type='integer'> 2 </cn>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["ParabolicCylinderD", "[", RowBox[List["\[Nu]_", ",", RowBox[List["-", "z_"]]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["ParabolicCylinderD", "[", RowBox[List["\[Nu]", ",", "z"]], "]"]], "-", RowBox[List[SuperscriptBox["2", FractionBox[RowBox[List["1", "+", "\[Nu]"]], "2"]], " ", "z", " ", SuperscriptBox["\[ExponentialE]", RowBox[List["-", FractionBox[SuperscriptBox["z", "2"], "4"]]]], " ", RowBox[List["Gamma", "[", FractionBox[RowBox[List["1", "+", "\[Nu]"]], "2"], "]"]], " ", RowBox[List["Sin", "[", FractionBox[RowBox[List["\[Pi]", " ", "\[Nu]"]], "2"], "]"]], " ", RowBox[List["LaguerreL", "[", RowBox[List[FractionBox[RowBox[List["\[Nu]", "-", "1"]], "2"], ",", FractionBox["1", "2"], ",", FractionBox[SuperscriptBox["z", "2"], "2"]]], "]"]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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