
<!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">
<lambda>
  <bvar><ci> b </ci></bvar>
  <apply>
    <int/>
    <bvar>
       <ci> x </ci>
    </bvar>
    <lowlimit>
       <ci> a </ci>
    </lowlimit>
    <uplimit>
       <ci> b </ci>
    </uplimit>
    <apply><fn><ci> f </ci></fn>
       <ci> x </ci>
    </apply>
  </apply>
</lambda>
</math>