Example exc-156

Prev: exc-155

Next: exc-157

x a b f x

<math>
<apply><product/>
  <bvar><ci> x </ci></bvar>
  <lowlimit> <ci> a </ci></lowlimit>
  <uplimit><ci> b </ci></uplimit>
  <apply><ci type="function"> f </ci><ci> x </ci></apply>
</apply>
</math>