<math>
<set>
<bvar><ci> x </ci></bvar>
<condition>
<apply><and/>
<apply><lt/>
<ci> x </ci>
<cn> 5 </cn>
</apply>
<apply><in/>
<ci> x </ci>
<naturalnumbers/>
</apply>
</apply>
</condition>
<ci> x </ci>
</set>
</math>