<math xmlns="http://www.w3.org/1998/Math/MathML"> <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>
Author: MathML 2 Recommendation