rec-set1

set: {b, a, c}

W3C sample	WIRIS
	$\{b, a, c\}$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <set>
    <ci>b</ci>
    <ci>a</ci>
    <ci>c</ci>
  </set>
</math>

Author: MathML 2 Recommendation