Differential equations Numerical solutions 35 Integral equations 13 Congresses 11 Stability 9 Asymptotic expansions 7 Boundary value problems 7 Data processing 6 Asymptotic theory 5 Mathematical physics 5 Engineering mathematics 4 Mathematical optimization 4 Banach spaces 3 Calculus of variations 3 Calculus, Operational 3 Difference equations 3 Functional analysis 3 Harmonic analysis 3 Mathematics 3 Perturbation (Mathematics) 3 Series, Infinite 3 Singular perturbations (Mathematics) 3 Approximation theory 2 Calculus 2 Calculus, Integral 2 Celestial mechanics 2 Differential equations, Partial 2 Dynamics 2 Mechanics, Analytic 2 Nonlinear operators 2