2.11

Oof! This section dove into more detailed algebra than the previous ones... or is it just me? I'll probably have to read over some of those derivations again, and I'll probably grasp some of this better once I start doing the homework and get more of a handle on it. I was a bit curious about the potentials though. In electrostatics/electrodynamics, the potentials actually do have interesting physical interpretations. Are there physical interpretations for these potentials, phi and A? They're certainly interesting mathematical tricks to make the equations more solvable, but it would be even better if they had some sort of interpretation on their own as well.