On gauge invariance and the path integral
arXiv:hep-th/9405083 · doi:10.1103/PhysRevA.51.2614
Abstract
Using a gauge covariant operator technique we deduce the path integral for a charged particle in a stationary magnetic field, verifying the "midpoint rule" for the discrete form of the interaction term with the vector potential.
4 pages, Latex, IF-UFRJ-94