Problem sets for MATH 383 at UNC. By the way, there's a joke in the Harvard math department: the less diff eq you know, the better you are at math. Fuck diff eq. It should not be a required class for anything other than physics majors. Pure math majors and CS majors do not need to know diff eq. Frankly with what they teach, nobody needs to know it. It's just methods of solution, which is archaic given Wolfram Alpha now. Just teach us the intuition behind these things, not make us memorize this shit.
I'm pretty sure I opted to just stop doing the homeworks because he said it barely affects our grade and I wanted to do as little diff eq as possible before my brain rotted.