I'm working on my applications for summer REUs (math). I've got my recommendations, my CV, a couple of cover letters, various personal statements, but there is one personal statement giving problems. It asks me to write about a page detailing, among other things, my "mathematical background." What does that mean? Surely they don't want another list of my coursework. They've got 2 already. Should I discuss why I got into math? Should I discuss a particular area of interest?