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<para>
Einstien's most famous equation,
<inlineequation><inlinemediaobject><imageobject><imagedata fileref="figures/emc2.gif"/></imageobject><textobject><phrase>E=mc<superscript>2</superscript></phrase></textobject></inlinemediaobject></inlineequation>, expresses the relationship between matter
and energy.
</para>
