A sufficient condition is found for the product of two Toeplitz operators on the Hardy space of the unit sphere to be a compact perturbation of a Toeplitz operator. The condition leads to a criterion for a Hankel operator to be compact. ## 1997 Academic Press The object of this present paper is to
Hankel- and Toeplitz-Type Operators on the Unit Ball
โ Scribed by Jianxun He
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 129 KB
- Volume
- 259
- Category
- Article
- ISSN
- 0022-247X
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โฆ Synopsis
Let B m be the unit ball in the m-dimensional complex plane C m with the weighted measure
From the viewpoint of the Cauchy-Riemann operator we give an orthogonal direct sum decomposition for L 2 B m dยต ฮฑ z , i.e., L 2 B m dยต ฮฑ z = โ nโZ + ฯโ A ฯ n , where the components A + + + 0 and A ---0 are just the weighted Bergman and conjugate Bergman spaces, respectively. Using the simplex polynomials from T. H. Koornwinder and A. L. Schwartz (1997, Constr. Approx 13, 537-567), we obtain an orthogonal basis for every subspace. As an application of the orthogonal decomposition, we define the Hankel-and Toeplitz-type operators and discuss S p -criteria for these kinds of operators.
๐ SIMILAR VOLUMES
We consider the question for which square integrable analytic functions f and g on the unit disk the densely defined products T f T gร are bounded on the Bergman space. We prove results analogous to those obtained by the second author [17] for such Toeplitz products on the Hardy space. We furthermor
## Abstract In this paper we study generalized Hankel operators ofthe form : โฑ^2^(|__z__ |^2^) โ __L__^2^(|__z__ |^2^). Here, (__f__):= (IdโP~__l__~ )($ \bar z $^k^__f__) and P__l__ is the projection onto __A__~__l__~ ^2^(โ, |__z__ |^2^):= cl(span{$ \bar z $^__m__^ __z^n^__ | __m__, __n__ โ __N__,
## Abstract In this paper we study boundedness of generalized Hankel operators of the form \documentclass{article}\usepackage{amssymb,mathrsfs}\begin{document}\pagestyle{empty}${\rm H}\_{{\overline{z}}^k}^l: {\mathscr F}^2\big (|z|^2\big )\rightarrow L^2\big (|z|^2\big )$\end{document} and thereby
## Abstract In this paper we consider Hankel operators $ \tilde H \_{{\bar z}^k}$ = (__Id__ โ __P__ ~1~)$ \bar z^k $ from __A__ ^2^(โ, |__z__ |^2^) to __A__ ^2,1^(โ, |__z__ |^2^)^โฅ^. Here __A__ ^2^(โ, |__z__ |^2^) denotes the Fock space __A__ ^2^(โ, |__z__ |^2^) = {__f__: __f__ is entire and โ__f_