Asymptotic expansions Differential equations 7 Numerical solutions 5 Approximation theory 2 Differential equations, Linear 2 Mathematical analysis 2 Mathematical statistics 2 Oscillations 2 Perturbation (Mathematics) 2 Singular perturbations (Mathematics) 2 Boundary layer 1 Central limit theorem 1 Congresses 1 Control theory 1 Convergence 1 Differential equations, Partial 1 Distribution (Probability theory) 1 Functions 1 Functions of complex variables 1 Integrals 1 Mathematical optimization 1 Nonlinear mechanics 1 Nonstandard mathematical analysis 1 Ocean circulation 1 Series, Taylor's 1 Spectral theory (Mathematics) 1 Waves 1