how much DEs do physics majors need to know to handle upper-div physics? I'm thinking of taking this upper-div ODEs class: "Laplace transforms, existence and uniqueness theorems, Fourier series, separation of variable solutions to partial differential equations, Sturm-Liouville theory, calculus of variations, two point boundary value problems, Green's functions. " but I already covered laplace transforms, fourier series, and covered very slightly seperation of variables in my lower-div DEs class. I just transferred to this school, so I heard this stuff is new for most people (it is trimester, my DEs class was semester system) Would this class be a waste of time for me? So the rest of the stuff like green's functions, sturm-liouville theory, etc are unnecessary for physics, right? I would rather take a pure math class than this, unless this class proves tremendously helpful for my physics classes.