Shift Operator, shift operator, Research exposition (monographs, survey articles) pertaining to operator theory, Invariant subspaces of linear operators, truncated shift operator, Canonical models for contractions and nonselfadjoint linear operators, unicellularity, spectral subspaces, Spectral synthesis on groups, semigroups, etc., Banach algebras of differentiable or analytic functions, \(H^p\)-spaces, Linear operators on function spaces (general), Toeplitz operators, Hankel operators, Wiener-Hopf operators, Hermitian and normal operators (spectral measures, functional calculus, etc.), Spectrum, resolvent, semigroups of shifts, (Generalized) eigenfunction expansions of linear operators; rigged Hilbert spaces, Subnormal operators, hyponormal operators, etc., sets of uniqueness