Hey everyone, This term I'm enrolled in E&M which is a subject I've never formally learned anything in but I've loved for years and gained a lot of practical knowledge in (I'm a Ham radio junkie). Now I'm one week into the course and I really like it but there's one problem that needs to be taken care of ASAP. I'm enrolled in calc II this term (which is a corequisite) but the E&M prof seems to be under the distinct impression that the math ability in the class is a lot further then that. Not very complicatedly I'm told, but I and many of my fellow classmates have just never reached some things he's used for proofs etc in math class yet. So I'm not going to let something like this get in my way of learning what I want to learn (can't drop it and wait a term as I'm an astronomy/physics major). Right now I've figured the best thing would be to learn ahead a bit in math so I will be familiar with the mathematical bits much better. I've learned a lot of math on my own and have a few friends further ahead in math then me willing to help out but I don't know what's most worth my time to study. So in short what are the most crucial mathematical concepts you need to know in a basic E&M course? Because I don't want to suddenly discover before a test that I flat out don't know how to do something mathematically; I'm sure the class will be challenging enough without that! Thanks.