You can use ascii notation to add formatted math text to comments.
To add formatted math text, surround the math text with double dollar signs:
You can mix math text and regular text together.
The text will be formatted in all views after you leave the comment.
This also works with teacher and student replies, but does not yet work for peer review. We're hoping to add this functionality soon.
For a full reference of ascii math symbols, visit http://asciimath.org/.