Differential equations, Partial Numerical solutions 23 Congresses 13 Boundary value problems 8 Finite element method 6 Data processing 4 Control theory 3 Differential equations, Nonlinear 3 Functional analysis 3 Mathematical physics 3 Wave-motion, Theory of 3 Analytic functions 2 Calculus of variations 2 Differential calculus 2 Differential equations 2 Differential equations, Linear 2 Differential operators 2 Improperly posed problems 2 Initial value problems 2 Integral operators 2 Mathematical models 2 Nonlinear theories 2 Numerical analysis 2 Spectral theory (Mathematics) 2 Transformations (Mathematics) 2 Asymptotic expansions 1 Asymptotic theory 1 Besov spaces 1 Bifurcation theory 1 Biology 1