You can use MathJax inside Pollen today. As far as building more integrated support for math typesetting, I'd like to do that, but what I'm not sure about yet are the ergonomics. Ideally, you'd just be able to drop TeX-style math expressions into the markup, indicating whether they're inline or block, and Pollen would do the right thing in terms of handling the rendering (based on whether the output is a web page vs. something else).