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e 2.71828


I have a need to include the mathematical constant e, 2.71828..., the 
base of the natural logarithms, in a book I'm writing. According to 
the Unicode folks, they have no special character for this and none 
is needed. I should just use the normal ASCII e. That's simple enough.

In typesetting a mathematical constant of this nature is normally 
italicized so it's not just plain text. How should I represent this 
in DocBook?

<inlineequation>e</inlineequation> is not valid because the 
inlineequation element can't contain PCDATA.

The best I can figure is

<inlineequation>
   <inlinemediaobject>
     <textobject>
       <phrase>e</phrase>
     </textobject>
   </inlinemediaobject>
</inlineequation>

which really seems excessively complicated. Going to MathML seems 
even worse. Is this really the best I can do?
-- 

+-----------------------+------------------------+-------------------+
| Elliotte Rusty Harold | elharo@metalab.unc.edu | Writer/Programmer |
+-----------------------+------------------------+-------------------+
|          The XML Bible, 2nd Edition (Hungry Minds, 2001)           |
|             http://www.cafeconleche.org/books/bible2/              |
|   http://www.amazon.com/exec/obidos/ISBN=0764547607/cafeaulaitA/   |
+----------------------------------+---------------------------------+
|  Read Cafe au Lait for Java News:  http://www.cafeaulait.org/      |
|  Read Cafe con Leche for XML News: http://www.cafeconleche.org/    |
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