Asymptotic expansions Mathematical models 8 Diffraction 5 Electromagnetic waves 4 Electromagnetism 4 Mathematics 4 Approximation theory 3 Capacity theory (Mathematics) 3 Composite construction 3 Data processing 3 Functions, Special 3 Numerical analysis 3 Structural analysis (Engineering) 3 Structural frames 3 Differential equations, Partial 2 Numerical solutions 2 Reaction-diffusion equations 2 Buckling (Mechanics) 1 Eigenfunctions 1 Estimation theory 1 Mathematical statistics 1 Plates (Engineering) 1 Probabilities 1 Shells (Engineering) 1 X-rays 1