Boundary value problems Numerical solutions 21 Differential equations, Partial 8 Engineering mathematics 8 Congresses 7 Differential equations 7 Differential equations, Elliptic 7 Data processing 5 Calculus of variations 4 Finite element method 4 Fluid dynamics 4 Spectral theory (Mathematics) 4 Integral equations 3 Mathematical physics 3 Approximation theory 2 Functions 2 Heat 2 Initial value problems 2 Integrals 2 Invariant imbedding 2 Iterative methods (Mathematics) 2 Mathematical models 2 Perturbation (Mathematics) 2 Adaptive control systems 1 Antenna arrays 1 Asymptotic theory 1 Bibliography 1 Clay soils 1 Coding theory 1 Conduction 1