Coincidentally, I just had a talk with one of our principle developers about Fourier transforms. He's an audio expert and was trying to explain re-sampling and aliasing to me. I understand the high level steps, but the math is all a blur to me. Recently I've been trying to become much stronger in math, as I eventually want to study aerodynamics and astrophysics. So I've been studying calculus (textbook) and dynamics (edx) lately.