rec-laplacian1

laplacian

W3C sample	WIRIS
	$\nabla^2 (f)=\mathop{\mathrm{div}}(\mathop{\mathrm{grad}}(f))$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <eq/>
    <apply>
      <laplacian/>
      <ci>f</ci>
    </apply>
    <apply>
      <divergence/>
      <apply>
        <grad/>
        <ci>f</ci>
      </apply>
    </apply>
  </apply>
</math>

Author: MathML 2 Recommendation