I was wondering, if it wouldn't be too boring for any of you, if someone could post an intro to multivariable calculus, from partial differentiation up through the grad, curl, divergence of vector fields, preferrably with applications to physics. Maybe you can post a sticky or something. I'm trying to study up on some more advanced E&M, and having a tough time hacking through all that stuff. I know it's all in my text, but I can hardly find derivations, or even reasons for many of the concepts. I also like the idea of getting instant feedback on difficulties. Thanks in advance.