
<!DOCTYPE math
  PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<math xmlns="http://www.w3.org/1998/Math/MathML">
 Theorem 1: if <mi>x</mi> &gt; 1, then
<mi>x</mi><sup>2</sup> &gt; <mi>x</mi>.  
</math>