Linear operators 50 Hilbert space 10 Mathematics 6 Operator theory 5 Banach spaces 4 Functional analysis 4 Matrices 4 Spectral theory (Mathematics) 4 Function spaces 3 Linear operations 3 Toeplitz operators 3 Algebras, Linear 2 Approximation theory 2 Approximations -- expansions-- Mathematics 2 COMPUTERS / Computer Graphics 2 Geometry, Analytic 2 Hankel operators 2 Interpolation 2 Invariant subspaces 2 Inverse problems (Differential equations) 2 Linear systems 2 MATHEMATICS / Algebra / General 2 Mathematical physics 2 Moment problems (Mathematics) 2 Schur functions 2 Study and teaching 2 Vector spaces 2 Wiener-Hopf operators 2 Algebra,linear 1 Banach algebras 1