Spectral theory (Mathematics) 33 Spectral Theory-- Mathematics 11 Linear operators 8 Operator theory 8 Functional analysis 4 Numerical solutions 3 Congresses 2 Differential equations, Partial 2 Eigenvalues 2 Fluid dynamics 2 Fourier analysis 2 Gaussian processes 2 Integral equations 2 Mathematics 2 Matrices 2 Prediction theory 2 Stationary processes 2 Asymptotic expansions 1 Banach algebras 1 COMPUTERS / General 1 Computational fluid dynamics 1 Data processing 1 Differential equations, Hyperbolic 1 Differential equations-- Analysis-- Mathematics 1 Differential geometry 1 Differential operators 1 Elliptic operators 1 Finite element method 1 Finite groups 1 Functionaalanalyse 1