m-Isometric block Toeplitz operators
نویسندگان
چکیده
منابع مشابه
Products of Block Toeplitz Operators
Let D be the open unit disk in the complex plane and ∂D the unit circle. Let dσ(w) be the normalized Lebesgue measure on the unit circle. We denote by L(C) (L for n=1) the space of C-valued Lebesgue square integrable functions on the unit circle. The Hardy space H(C) (H for n=1) is the closed linear span of C-valued analytic polynomials. We observe that L(C) = L ⊗ C and H(C) = H ⊗ C, where ⊗ de...
متن کاملHyponormality and Subnormality of Block Toeplitz Operators
In this paper we are concerned with hyponormality and subnormality of block Toeplitz operators acting on the vector-valued Hardy space H Cn of the unit circle. Firstly, we establish a tractable and explicit criterion on the hyponormality of block Toeplitz operators having bounded type symbols via the triangularization theorem for compressions of the shift operator. Secondly, we consider the gap...
متن کاملBlock Toeplitz operators with rational symbols
Toeplitz operators (or equivalently, Wiener-Hopf operators; more generally, block Toeplitz operators; and particularly, Toeplitz determinants) are of importance in connection with a variety of problems in physics, and in particular, in the field of quantum mechanics. For example, a study of solvable models in quantum mechanics uses the spectral theory of Toeplitz operators (cf. [Pr]); the one-d...
متن کاملBlock Toeplitz Operators with Frequency- Modulated Semi-almost Periodic Symbols
This paper is concerned with the influence of frequency modulation on the semiFredholm properties of Toeplitz operators with oscillating matrix symbols. The main results give conditions on an orientation-preserving homeomorphism α of the real line that ensure the following: if b belongs to a certain class of oscillating matrix functions (periodic, almost periodic, or semi-almost periodic matrix...
متن کاملToeplitz Operators
This article discusses Paul Halmos’s crucial work on Toeplitz operators and the consequences of that work. Mathematics Subject Classification (2000). 47B35.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Inequalities and Applications
سال: 2019
ISSN: 1029-242X
DOI: 10.1186/s13660-019-2138-z