informalequation.example.1.sgm   [plain text]

<!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook V3.1//EN">
<para>
The equation 
<informalequation>
  <alt>e^(pi*i) + 1 = 0</alt>
  <graphic fileref="figures/epi10"></graphic>
</informalequation>
is delightful because it joins together five of the most
important mathematical constants.
</para>