rec-cs1

A basic of example of cs

W3C sample	WIRIS
	$\{A, B, \}$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <set>
    <cs>A</cs>
    <cs>B</cs>
    <cs/>
  </set>
</math>

Author: MathML 3.0