[racket] state of math expressions in Scribble?

Jens Axel wrote:

> Prabhalar Ragde's code from
>
> http://con.racket-lang.org/pr-slides.pdf
>
> works quite well. Code ready to use in:
>
> https://github.com/soegaard/bracket/blob/master/docs/pr-math.rkt

Thanks for making this more accessible, Jens Axel. One caveat is that 
the MathJax approach only works if you are connected to the Internet 
while displaying the page. If you are offline, you see the raw LaTeX 
markup (which is a good fallback for me, as I use pseudo-LaTeX in 
answering student questions on forums and in email, and they seem to 
adapt to it very quickly). A MathML approach would probably be better in 
the long run, as more browsers come to support it. --PR