Linear operators Matrices 4 Spectral theory (Mathematics) 4 Function spaces 3 Hilbert space 3 Operator theory 3 Algebras, Linear 2 Approximation theory 2 Banach spaces 2 COMPUTERS / Computer Graphics 2 Functional analysis 2 Geometry, Analytic 2 Hankel operators 2 Interpolation 2 Inverse problems (Differential equations) 2 Linear systems 2 MATHEMATICS / Algebra / General 2 Mathematics 2 Moment problems (Mathematics) 2 Schur functions 2 Study and teaching 2 Toeplitz operators 2 Vector spaces 2 Wiener-Hopf operators 2 Algebra,linear 1 Banach algebras 1 Congresses 1 Determinants 1 Eigenvectors 1 Factorization of operators 1