Hi Laurent,
How did you generate this MathML code? It is content MathML but MathJax
only supports presentation MathML at the moment, so you'd better you
this latter version. Note that I've recently written an add-on for
Firefox, based on David Carlisle's ctop.xsl:
https://addons.mozilla.org/fr/firefox/addon/mathml-ctop/
which converts from content MathML to presentation MathML. When I tested
it, the conversion seemed to run before the MathJax code, so MathJax is
then able to render the presentation MathML. Unfortunately, there is no
versions for other browsers and you probably don't want to ask your user
to install the add-on.
The MathPlayer plug-in for Internet Explorer is also able to render
content MathML.
--
Frédéric Wang
maths-informatique-jeux.com/blog/frederic