Boundary value problems Numerical solutions 16 Engineering mathematics 12 Differential equations, Elliptic 10 Differential equations, Partial 10 Differential equations 8 Mathematics 8 Fourier series 6 Mathematical physics 6 Finite element method 5 Differential equations, Nonlinear 3 Differential operators 3 Electromagnetic waves 3 Initial value problems 3 Mathematical models 3 Pseudodifferential operators 3 Spectral theory (Mathematics) 3 Asymptotic expansions 2 Bifurcation theory 2 Data processing 2 Decomposition (Mathematics) 2 Economics, Mathematical 2 Eigenvalues 2 Elasticity 2 Functions, Orthogonal 2 Functions, Special 2 Hodge theory 2 Inverse problems (Differential equations) 2 Manifolds (Mathematics) 2 Nonlinear integral equations 2