rec-cartesianproduct2

W3C sample	WIRIS
	$\mathbb{R}^3$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <cartesianproduct/>
    <reals/>
    <reals/>
    <reals/>
  </apply>
</math>

Author: MathML 2 Recommendation