====MathML====
I tried various methods to get MathML to work and always failed. It looks like the community bet on Mathoid working out, but there's been no development on it for 5 months now, and it looks dead. The good news, if is that MathJax works just fine right out of the box:
git clone https://github.com/jmnote/SimpleMathJax.git
wfLoadExtension( 'SimpleMathJax' );