Numerical solutions 38 Differential equations 35 Asymptotic expansions 5 Congresses 5 Data processing 5 Boundary value problems 4 Integral equations 4 Asymptotic theory 3 Perturbation (Mathematics) 3 Approximation theory 2 Initial value problems 2 Integro-differential equations 2 Mathematical physics 2 Singular perturbations (Mathematics) 2 Almost periodic functions 1 Asymptotes 1 Calculus of variations 1 Coding theory 1 Collocation methods 1 Difference equations 1 Differential equations, Partial 1 Elasticity 1 Electromagnetism 1 Equations 1 Functional analysis 1 Hilbert space 1 Integrals 1 Invariant imbedding 1 Inverse problems (Differential equations) 1 Mathematics 1