Render math formulae within the document using something like http://www.mathjax.org or similar.
Paul Bienkowski commented
KaTeX looks good, MathJax is annoying to set up.
I think the $...$ / $$...$$ syntax won't conflict with markdown, would it? Probably should extract these parts, pass them through the forumla renderer, and paste them back in *after* the Markdown filter, because otherwise markdown will render all the special chars inside the formula, too.
I like this suggestion! Looks like we'll be needing "Thought Plan Flavored Markdown". ;) Any syntax suggestions that will integrate nicely with markdown and not cause conflicts?
https://github.com/Khan/KaTeX is a nice alternative to mathjax, and looks like it's faster.