Mediawiki doesn't currently seem to support commands which instruct TeX about
which symbol class a symbol should be. (These commands include \mathord,
\mathop, \mathbin, \mathrel, \mathopen, \mathclose, and \mathpunct). These
commands allow the writer to explicitly state whether a given symbol is being
used as an operator, relation, etc., and are necessary for proper spacing when
an operator is being used in an unusual way, and would avoid having to do manual
spacing hacks such as the included URL.
I know this probably isn't a high priority, but it would be really helpful for
us TeX geeks!