supported by National Natural Science Foundation of China (Grant Nos.10701031,10571041)
The (U + K)-orbit of a bounded linear operator T acting on a Hilbert space H is defined as (U + K)(T)={R-1 T R:R is invertible of the form unitary plus compact on H}.In this paper,we first characterize the closure of ...
supported by the National Natural Science Foundation of China (Grant No. 10571041);Hebei Provincial Natural Science Foundation (Grant No. A2005000006)
Let H olenote a complex separable Hilbert space and L(H) denote the collection of bounded linear operators on H. An operator T ∈ L(H) is said to be strongly irreducible if T does not commute with any nontrivial idemp...
the National Natural Science Foundation of China(10571041);the Doctoral Foundation of Hebei Normal University(130144)
In this paper, using the matrix skills and operator theory techniques we characterize the commutant of analytic Toeplitz operators on Bergman space. For f(z) = z^ng(z) (n ≥1), g(z) = b0 + b1z^p1 +b2z^p2 +....
the National Natural Science Foundation of China (No. 10571041); the Natural Science Foundation of Hebei Province (No. A2005000006).
In this note, we show that a Cowen-Douglas operator is strongly irreducible if and only if its commutant algebra rood its Jocobson radical is isomorphic to a closed subalgebra of H^∞ (D), where D is the open unit d...
the National Natural Science Foundation of China (Grant No. 10571041)
The famous von Neumann-Wold Theorem tells us that each analytic Toeplitz operator with n + 1-Blaschke factors is unitary to n + 1 copies of the unilateral shift on the Hardy space. It is obvious that the von Neumann-W...