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   http://functions.wolfram.com/03.18.20.0012.01
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    D[KelvinBer[\[Nu], z], {z, 2}] == 
 (1/4) (KelvinBei[-2 + \[Nu], z] - 2 KelvinBei[\[Nu], z] + 
   KelvinBei[2 + \[Nu], z]) 
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   Cell[BoxData[RowBox[List[RowBox[List[SubscriptBox["\[PartialD]", RowBox[List["{", RowBox[List["z", ",", "2"]], "}"]]], RowBox[List["KelvinBer", "[", RowBox[List["\[Nu]", ",", "z"]], "]"]]]], "\[Equal]", RowBox[List[FractionBox["1", "4"], " ", RowBox[List["(", RowBox[List[RowBox[List["KelvinBei", "[", RowBox[List[RowBox[List[RowBox[List["-", "2"]], "+", "\[Nu]"]], ",", "z"]], "]"]], "-", RowBox[List["2", " ", RowBox[List["KelvinBei", "[", RowBox[List["\[Nu]", ",", "z"]], "]"]]]], "+", RowBox[List["KelvinBei", "[", RowBox[List[RowBox[List["2", "+", "\[Nu]"]], ",", "z"]], "]"]]]], ")"]]]]]]]] 
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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>  <mfrac>  <mrow>  <msup>  <mo> ∂ </mo>  <mn> 2 </mn>  </msup>  <mrow>  <msub>  <mi> ber </mi>  <mi> ν </mi>  </msub>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  </mrow>  <mrow>  <mo> ∂ </mo>  <msup>  <mi> z </mi>  <mn> 2 </mn>  </msup>  </mrow>  </mfrac>  <mo>  </mo>  <mrow>  <mfrac>  <mn> 1 </mn>  <mn> 4 </mn>  </mfrac>  <mo> ⁢ </mo>  <mrow>  <mo> ( </mo>  <mrow>  <mrow>  <msub>  <mi> bei </mi>  <mrow>  <mi> ν </mi>  <mo> - </mo>  <mn> 2 </mn>  </mrow>  </msub>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> - </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mrow>  <msub>  <mi> bei </mi>  <mi> ν </mi>  </msub>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  </mrow>  <mo> + </mo>  <mrow>  <msub>  <mi> bei </mi>  <mrow>  <mi> ν </mi>  <mo> + </mo>  <mn> 2 </mn>  </mrow>  </msub>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <partialdiff />  <bvar>  <ci> z </ci>  <degree>  <cn type='integer'> 2 </cn>  </degree>  </bvar>  <apply>  <ci> KelvinBer </ci>  <ci> ν </ci>  <ci> z </ci>  </apply>  </apply>  <apply>  <times />  <cn type='rational'> 1 <sep /> 4 </cn>  <apply>  <plus />  <apply>  <ci> KelvinBei </ci>  <apply>  <plus />  <ci> ν </ci>  <cn type='integer'> -2 </cn>  </apply>  <ci> z </ci>  </apply>  <apply>  <times />  <cn type='integer'> -1 </cn>  <apply>  <times />  <cn type='integer'> 2 </cn>  <apply>  <ci> KelvinBei </ci>  <ci> ν </ci>  <ci> z </ci>  </apply>  </apply>  </apply>  <apply>  <ci> KelvinBei </ci>  <apply>  <plus />  <ci> ν </ci>  <cn type='integer'> 2 </cn>  </apply>  <ci> z </ci>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[SubscriptBox["\[PartialD]", RowBox[List[RowBox[List["{", RowBox[List["z_", ",", "2"]], "}"]]]]], RowBox[List["KelvinBer", "[", RowBox[List["\[Nu]_", ",", "z_"]], "]"]]]], "]"]], "\[RuleDelayed]", RowBox[List[FractionBox["1", "4"], " ", RowBox[List["(", RowBox[List[RowBox[List["KelvinBei", "[", RowBox[List[RowBox[List[RowBox[List["-", "2"]], "+", "\[Nu]"]], ",", "z"]], "]"]], "-", RowBox[List["2", " ", RowBox[List["KelvinBei", "[", RowBox[List["\[Nu]", ",", "z"]], "]"]]]], "+", RowBox[List["KelvinBei", "[", RowBox[List[RowBox[List["2", "+", "\[Nu]"]], ",", "z"]], "]"]]]], ")"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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