Asymptotic expansions Approximation theory 5 Differential equations 4 Eigenvalues 4 Analytic functions 3 Asymptotic theory 3 Calculus 3 Boundary value problems 2 Functions, Special 2 Initial value problems 2 Integral equations 2 Integrals 2 Mathematical models 2 Mathematical physics 2 Nonlinear waves 2 Numerical analysis 2 Perturbation (Mathematics) 2 Solitons 2 Spectral theory (Mathematics) 2 Stochastic processes 2 Wave equation 2 Algorithms 1 Attractors (Mathematics) 1 Calculus of tensors 1 Combinatorial analysis 1 Data processing 1 Difference equations 1 Differentiable dynamical systems 1 Differential equations, Hypoelliptic 1 Differential equations, Linear 1