Advances in Imaging and Electron Physics, Volume 235 merges two long-running serials, Advances in Electronics and Electron Physics and Advances in Optical and Electron Microscopy . Chapters in this release cover Unified formalism of light beam optics and light polarization, Relativistic Theory and Calculation of Electrostatic Focusing Systems, A Nonlinear Representation Theory of Equivariant Deep Learning Using Group Morphology. Provides the authority and expertise of leading contributors from an international board of authors Presents the latest release in the Advances in Imaging and Electron Physics series