I'd be very glad if DuoLingo team can work out a new category for Mathematics in the Free Translation Section.
Atleast there must be enough technical support, in terms of Mathjax.
See: http://www.duolingo.com/translation/fb22c050d21d4d612fa84a9e9d835efa for my attempt to use DuoLingo for Math. I got a lot of unfair points, and it is annoying that there are unnatural line breaks.
Hope you guys would consider this idea.