> The only thing that $$...$$ has over [[math:...]]
is in the
> situation of a very short formula like a single letter, and
> there it's better to use <var> instead of a gif *anyway*.
I disagree strongly. That would mean that if I have a
formula
with one letter variables and two letter variables the first
would be written as <var> and the second as TeX within the same
text. Always using LaTeX will look better and is more consistent.
Formulas should be seen as "inclusions", so I prefer the [[math:
syntax overall. The software should look at the formula inside
the brackets, and choose how to output it. In particular, if it
detects Mozilla it should output MATHML instead of calling TeX.
Maybe if it's just a variable name, it could just output a <var>.