This physicist and an alphabetically-later collaborator developed a set of electrodynamic equations that set an upper limit on the self-energy of a point charge to avoid divergences in Maxwell electrodynamics. This physicist developed a coordinate chart to describe the worldlines of Langevin observers on a rotating disk, which must have constant orthogonal spacetime distance to satisfy this physicist’s relativistic formulation of rigidity. While at Göttingen, this physicist and Heisenberg developed the matrix representation (-5[1])of quantum physics. This physicist proposed that the squared magnitude of a wave function equals the probability of finding a (10[1])particle. For 10 points, name this German physicist who names an approximation that fixes nuclei in space along with J. Robert Oppenheimer. ■END■ (10[1])