I think this is the first time I've used this forum for myself. OK, I'm picking out courses for next semester. Right now I'm in the second semester of Complex Analysis (based on Serge Lang's book) which is a grad level course in single variable complex analysis. My school offers a third course, in multivariable complex analysis and I'm tempted to take it. However, I want to use my time wisely and my whole objective is to study mathematics in order to become a better physicist. So, do any of our physicists here ever need to know this subject? If so, in what area(s) do you work? Thanks!