Coordinate systems Tensors 4 Convergence of numerical methods 2 Diffraction 2 Diffraction gratings 2 Electromagnetic waves 2 Functions 2 Gaugeless basis sets 2 Gratings 2 Index-matched interfaces 2 Interfaces (materials) 2 Linear equations 2 Magnetic fields 2 Magnetic permeability 2 Magnetic shielding 2 Nuclear magnetic hypershielding 2 Optical axis 2 Parameter estimation 2 Perturbation techniques 2 Rayleigh-Schrodinger perturbation theory 2 Refractive index 2 Wavevectors 2