Example ex4-065

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Next: ex4-066

<math>
<!-- reference to OpenMath formal syntax definition of Bessel function -->
<apply>
  <csymbol encoding="OpenMath"
           definitionURL="http://www.openmath.org/cd/BesselFunctions.ocd">
    <msub><mi>J</mi><mn>0</mn></msub>
  </csymbol>
  <ci>y</ci>
</apply>
<!-- reference to human readable text description of Boltzmann's constant -->
<csymbol encoding="text"
         definitionURL="www.example.org/universalconstants/Boltzmann.htm">
  k
</csymbol>
</math>