Just last night, DS8 was telling me his plans for not running out of math on a grade by grade level. He has himself taking differential equations in 10th grade and has a particular interest in Lie Theory because of seeing a book on it when exploring a university library a month ago. We don't know if it will happen at the state math high school, locally with dual enrollment, through some online program or what, but "running out of math" isn't going to happen. If school were able to tie his hands and restrict his access, then getting bored and fed up and giving up on math could happen.
