Operator theory 14 Linear operators 7 Congresses 4 Functional analysis 3 Matrices 3 Toeplitz operators 3 Banach spaces 2 Differential equations, Partial 2 Function spaces 2 Hankel operators 2 Hilbert space 2 Interpolation 2 Inverse problems (Differential equations) 2 Mathematics 2 Moment problems (Mathematics) 2 Pseudodifferential operators 2 Schur functions 2 System theory 2 Wiener-Hopf operators 2 C*-algebras 1 Control theory 1 Determinants 1 Differentiable mappings 1 Differential equations, Nonlinear 1 Differential equations, Partial.1 1 Eigenvalues 1 Factorization of operators 1 Finite differences 1 Geometry 1 Holomorphe Funktion 1