Papers discuss time-like trace regularity of wave equations, nonlinear optics in periodic diffractive structures, viscoelastic finite difference modeling, using exact controllability to solve the Helmholtz equations at high wave numbers, waveform inversion through MBTT reformulation, traveling waves in istachophoresis, electromagnetic wave scattering, numerical applications of asymptotic diffraction theory, and elastodynamic inverse obstacle scattering. No index. Annotation copyright Book News, Inc. Portland, Or.