1<?xml version="1.0"?> 2<!DOCTYPE reln SYSTEM "mathml.dtd" [ 3 <!ENTITY infty "infinity"> 4]> 5<reln> <eq/> 6 <set> 7 <bvar> <ci>x</ci> </bvar> 8 <condition> 9 <reln> <geq/><ci>x</ci><cn>0</cn> </reln> 10 </condition> 11 </set> 12 13 <interval closure='closed-open'> 14 <cn>0</cn> 15 <ci>&infty;</ci> 16 </interval> 17 </reln> 18