set with condition
<math xmlns="http://www.w3.org/1998/Math/MathML">
<set>
<bvar>
<ci>x</ci>
</bvar>
<condition>
<apply>
<lt/>
<ci>x</ci>
<cn>5</cn>
</apply>
</condition>
<ci>x</ci>
</set>
</math>
Author: Design Science, Inc. (E. Cannon, E. Tabacman, R.Miner)