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. (10[1])While at Göttingen, this physicist and Heisenberg (-5[1])developed the matrix representation of quantum physics. This physicist proposed that the squared magnitude of a wave function equals the probability (10[1])of finding a particle. For 10 points, name this German physicist who names an approximation that (10[1])fixes nuclei in space along with J. Robert (10[1])Oppenheimer. ■END■ (10[1]0[1])