Numerical solutions 22 Boundary value problems 21 Differential equations 4 Data processing 3 Differential equations, Elliptic 3 Differential equations, Partial 3 Calculus of variations 2 Congresses 2 Finite element method 2 Invariant imbedding 2 Spectral theory (Mathematics) 2 Adaptive control systems 1 Approximation theory 1 Coding theory 1 Differential equations, nonlinear 1 Differential operators 1 Differential-difference equations 1 ELLPACK (Computer system) 1 Eigenvalues 1 Elasticity 1 Engineering mathematics 1 Finite differences 1 Geodesy 1 Geodynamics 1 Hilbert space 1 Hydraulics 1 Initial value problems 1 Integral operators 1 Iterative methods (Mathematics) 1 Mathematical physics 1