If I write
$m<n$ in a question, the preview sees the less-than and interprets it as the begining of an XML tag. I have to write it as an HTML entity to get things going. Surely this is not intended?
Because TeX is parsed on the client side after Markdown is processed on the server side, and the current behavior is any unsupported HTML tags will be removed on the server side (even they are not closed), so this is indeed the intended behavior.
One simple workaround is to add a space between the