rec-grad1

gradient of f

W3C sample	WIRIS
[N/A]	$grad f$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <csymbol cd="veccalc1">grad</csymbol>
    <ci>f</ci>
  </apply>
</math>

Author: MathML 2 Recommendation