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<!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<para>
The equation 
<informalequation><alt>e^(pi*i) + 1 = 0</alt><graphic fileref="figures/epi10"/></informalequation>
is delightful because it joins together five of the most
important mathematical constants.
</para>
