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   http://functions.wolfram.com/07.07.30.0001.01
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    LegendreP[n, z]/(z - Subscript[z, 0]) == 
  (1/((1 - Subscript[z, 0]^2) (D[LegendreP[n, x], x] /. 
      x -> Subscript[z, 0]))) Sum[(2 k + 1) LegendreP[k, z] 
     LegendreP[k, Subscript[z, 0]], {k, 0, n - 1}] /; 
 Element[n, Integers] && n >= 0 && LegendreP[n, Subscript[z, 0]] == 0 
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   Cell[BoxData[RowBox[List[RowBox[List[FractionBox[RowBox[List["LegendreP", "[", RowBox[List["n", ",", "z"]], "]"]], RowBox[List["z", "-", SubscriptBox["z", "0"]]]], "\[Equal]", RowBox[List[FractionBox["1", RowBox[List[RowBox[List["(", RowBox[List["1", "-", SubsuperscriptBox["z", "0", "2"]]], ")"]], RowBox[List["(", RowBox[List[RowBox[List["D", "[", RowBox[List[RowBox[List["LegendreP", "[", RowBox[List["n", ",", "x"]], "]"]], ",", "x"]], "]"]], "/.", RowBox[List["x", "\[Rule]", SubscriptBox["z", "0"]]]]], ")"]]]]], RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "0"]], RowBox[List["n", "-", "1"]]], RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["2", "k"]], "+", "1"]], ")"]], RowBox[List["LegendreP", "[", RowBox[List["k", ",", "z"]], "]"]], " ", RowBox[List["LegendreP", "[", RowBox[List["k", ",", SubscriptBox["z", "0"]]], "]"]]]]]]]]]], "/;", RowBox[List[RowBox[List["n", "\[Element]", "Integers"]], "\[And]", RowBox[List["n", "\[GreaterEqual]", "0"]], "\[And]", RowBox[List[RowBox[List["LegendreP", "[", RowBox[List["n", ",", SubscriptBox["z", "0"]]], "]"]], "\[Equal]", "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>  <mfrac>  <mrow>  <msub>  <semantics>  <mi> P </mi>  <annotation encoding='Mathematica'> TagBox["P", LegendreP] </annotation>  </semantics>  <mi> n </mi>  </msub>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mrow>  <mi> z </mi>  <mo> - </mo>  <msub>  <mi> z </mi>  <mn> 0 </mn>  </msub>  </mrow>  </mfrac>  <mo> ⩵ </mo>  <mrow>  <mfrac>  <mn> 1 </mn>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <mn> 1 </mn>  <mo> - </mo>  <msubsup>  <mi> z </mi>  <mn> 0 </mn>  <mn> 2 </mn>  </msubsup>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mfrac>  <mrow>  <mo> ∂ </mo>  <mrow>  <msub>  <semantics>  <mi> P </mi>  <annotation encoding='Mathematica'> TagBox["P", LegendreP] </annotation>  </semantics>  <mi> n </mi>  </msub>  <mo> ( </mo>  <mi> x </mi>  <mo> ) </mo>  </mrow>  </mrow>  <mrow>  <mo> ∂ </mo>  <mi> x </mi>  </mrow>  </mfrac>  <msub>  <mo> | </mo>  <mrow>  <mi> z </mi>  <mo> ⩵ </mo>  <msub>  <mi> z </mi>  <mn> 0 </mn>  </msub>  </mrow>  </msub>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mfrac>  <mo> ⁢ </mo>  <mrow>  <munderover>  <mo> ∑ </mo>  <mrow>  <mi> k </mi>  <mo> = </mo>  <mn> 0 </mn>  </mrow>  <mrow>  <mi> n </mi>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </munderover>  <mrow>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  <mo> + </mo>  <mn> 1 </mn>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <msub>  <semantics>  <mi> P </mi>  <annotation encoding='Mathematica'> TagBox["P", LegendreP] </annotation>  </semantics>  <mi> k </mi>  </msub>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ⁢ </mo>  <mrow>  <msub>  <semantics>  <mi> P </mi>  <annotation encoding='Mathematica'> TagBox["P", LegendreP] </annotation>  </semantics>  <mi> k </mi>  </msub>  <mo> ( </mo>  <msub>  <mi> z </mi>  <mn> 0 </mn>  </msub>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  </mrow>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <mi> n </mi>  <mo> ∈ </mo>  <mi> ℕ </mi>  </mrow>  <mo> ∧ </mo>  <mrow>  <mrow>  <msub>  <semantics>  <mi> P </mi>  <annotation encoding='Mathematica'> TagBox["P", LegendreP] </annotation>  </semantics>  <mi> n </mi>  </msub>  <mo> ( </mo>  <msub>  <mi> z </mi>  <mn> 0 </mn>  </msub>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mn> 0 </mn>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> FormBox </ci>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> FractionBox </ci>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> SubscriptBox </ci>  <apply>  <ci> TagBox </ci>  <ms> P </ms>  <ci> LegendreP </ci>  </apply>  <ms> n </ms>  </apply>  <ms> ( </ms>  <ms> z </ms>  <ms> ) </ms>  </list>  </apply>  <apply>  <ci> RowBox </ci>  <list>  <ms> z </ms>  <ms> - </ms>  <apply>  <ci> SubscriptBox </ci>  <ms> z </ms>  <ms> 0 </ms>  </apply>  </list>  </apply>  </apply>  <ms> ⩵ </ms>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> FractionBox </ci>  <ms> 1 </ms>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> RowBox </ci>  <list>  <ms> ( </ms>  <apply>  <ci> RowBox </ci>  <list>  <ms> 1 </ms>  <ms> - </ms>  <apply>  <ci> SubsuperscriptBox </ci>  <ms> z </ms>  <ms> 0 </ms>  <ms> 2 </ms>  </apply>  </list>  </apply>  <ms> ) </ms>  </list>  </apply>  <apply>  <ci> RowBox </ci>  <list>  <ms> ( </ms>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> FractionBox </ci>  <apply>  <ci> RowBox </ci>  <list>  <ms> ∂ </ms>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> SubscriptBox </ci>  <apply>  <ci> TagBox </ci>  <ms> P </ms>  <ci> LegendreP </ci>  </apply>  <ms> n </ms>  </apply>  <ms> ( </ms>  <ms> x </ms>  <ms> ) </ms>  </list>  </apply>  </list>  </apply>  <apply>  <ci> RowBox </ci>  <list>  <ms> ∂ </ms>  <ms> x </ms>  </list>  </apply>  </apply>  <apply>  <ci> SubscriptBox </ci>  <apply>  <ci> ErrorBox </ci>  <ms> | </ms>  </apply>  <apply>  <ci> RowBox </ci>  <list>  <ms> z </ms>  <ms> ⩵ </ms>  <apply>  <ci> SubscriptBox </ci>  <ms> z </ms>  <ms> 0 </ms>  </apply>  </list>  </apply>  </apply>  </list>  </apply>  <ms> ) </ms>  </list>  </apply>  </list>  </apply>  </apply>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> UnderoverscriptBox </ci>  <ms> ∑ </ms>  <apply>  <ci> RowBox </ci>  <list>  <ms> k </ms>  <ms> = </ms>  <ms> 0 </ms>  </list>  </apply>  <apply>  <ci> RowBox </ci>  <list>  <ms> n </ms>  <ms> - </ms>  <ms> 1 </ms>  </list>  </apply>  </apply>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> RowBox </ci>  <list>  <ms> ( </ms>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> RowBox </ci>  <list>  <ms> 2 </ms>  <ms> k </ms>  </list>  </apply>  <ms> + </ms>  <ms> 1 </ms>  </list>  </apply>  <ms> ) </ms>  </list>  </apply>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> SubscriptBox </ci>  <apply>  <ci> TagBox </ci>  <ms> P </ms>  <ci> LegendreP </ci>  </apply>  <ms> k </ms>  </apply>  <ms> ( </ms>  <ms> z </ms>  <ms> ) </ms>  </list>  </apply>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> SubscriptBox </ci>  <apply>  <ci> TagBox </ci>  <ms> P </ms>  <ci> LegendreP </ci>  </apply>  <ms> k </ms>  </apply>  <ms> ( </ms>  <apply>  <ci> SubscriptBox </ci>  <ms> z </ms>  <ms> 0 </ms>  </apply>  <ms> ) </ms>  </list>  </apply>  </list>  </apply>  </list>  </apply>  </list>  </apply>  </list>  </apply>  <ms> /; </ms>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> RowBox </ci>  <list>  <ms> n </ms>  <ms> ∈ </ms>  <ms> ℕ </ms>  </list>  </apply>  <ms> ∧ </ms>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> RowBox </ci>  <list>  <apply>  <ci> SubscriptBox </ci>  <apply>  <ci> TagBox </ci>  <ms> P </ms>  <ci> LegendreP </ci>  </apply>  <ms> n </ms>  </apply>  <ms> ( </ms>  <apply>  <ci> SubscriptBox </ci>  <ms> z </ms>  <ms> 0 </ms>  </apply>  <ms> ) </ms>  </list>  </apply>  <ms> ⩵ </ms>  <ms> 0 </ms>  </list>  </apply>  </list>  </apply>  </list>  </apply>  <ci> TraditionalForm </ci>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", FractionBox[RowBox[List["LegendreP", "[", RowBox[List["n_", ",", "z_"]], "]"]], RowBox[List["z_", "-", SubscriptBox["z_", "0"]]]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox[RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "0"]], RowBox[List["n", "-", "1"]]], RowBox[List[RowBox[List["(", RowBox[List[RowBox[List["2", " ", "k"]], "+", "1"]], ")"]], " ", RowBox[List["LegendreP", "[", RowBox[List["k", ",", "z"]], "]"]], " ", RowBox[List["LegendreP", "[", RowBox[List["k", ",", SubscriptBox["zz", "0"]]], "]"]]]]]], RowBox[List[RowBox[List["(", RowBox[List["1", "-", SubsuperscriptBox["zz", "0", "2"]]], ")"]], " ", RowBox[List["(", RowBox[List[RowBox[List[SubscriptBox["\[PartialD]", RowBox[List["x"]]], RowBox[List["LegendreP", "[", RowBox[List["n", ",", "x"]], "]"]]]], "/.", "\[InvisibleSpace]", RowBox[List["x", "\[Rule]", SubscriptBox["zz", "0"]]]]], ")"]]]]], "/;", RowBox[List[RowBox[List["n", "\[Element]", "Integers"]], "&&", RowBox[List["n", "\[GreaterEqual]", "0"]], "&&", RowBox[List[RowBox[List["LegendreP", "[", RowBox[List["n", ",", SubscriptBox["zz", "0"]]], "]"]], "\[Equal]", "0"]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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| LegendreP[n,z] |  | LegendreP[n,mu,2,z] |  | LegendreP[nu,mu,z] |  | LegendreP[nu,mu,2,z] |  | LegendreP[nu,mu,3,z] |  |   |  
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