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A generalization of the Brown-Halmos theorems for the unit ball
Functional Analysis · Submitted 11 Jan 2021
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim In this paper we generalize the classical theorems of Brown and Halmos about algebraic properties of Toeplitz operators to Bergman spaces over the unit ball in several complex variables.
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In this paper we generalize the classical theorems of Brown and Halmos about algebraic properties of Toeplitz operators to Bergman spaces over the unit ball in several complex variables. A key result, which is of independent interest, is the characterization of summable functions $u$ on the unit ball whose Berezin transform can be written as a finite sum $\sum_{j}f_j\,\bar{g}_j$ with all $f_j, g_j$ being holomorphic. In particular, we show that such a function must be pluriharmonic if it is sufficiently smooth and bounded. We also settle an open question about $\mathcal{M}$-harmonic functions. Our proofs employ techniques and results from function and operator theory as well as partial differential equations.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In this paper we generalize the classical theorems of Brown and Halmos about algebraic properties of Toeplitz operators to Bergman spaces over the unit ball in several complex variables. | contribution 0.98 | 0.90 | 0.37 | asserted 0.99 |
| s1 | A key result, which is of independent interest, is the characterization of summable functions $u$ on the unit ball whose Berezin transform can be written as a finite sum $\sum_{j}f_j\,\bar{g}_j$ with all $f_j, g_j$ being holomorphic. | result 0.83 | 0.89 | 0.48 | asserted 1.00 |
| s2 | In particular, we show that such a function must be pluriharmonic if it is sufficiently smooth and bounded. | result 0.99 | 0.94 | 0.14 | asserted 1.00 |
| s3 | We also settle an open question about $\mathcal{M}$-harmonic functions. | result 0.59 | 0.92 | 0.08 | asserted 0.99 |
| s4 | Our proofs employ techniques and results from function and operator theory as well as partial differential equations. | method 1.00 | 0.71 | 0.02 | asserted 0.99 |
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Original abstract
In this paper we generalize the classical theorems of Brown and Halmos about algebraic properties of Toeplitz operators to Bergman spaces over the unit ball in several complex variables. A key result, which is of independent interest, is the characterization of summable functions $u$ on the unit ball whose Berezin transform can be written as a finite sum $\sum_{j}f_j\,\bar{g}_j$ with all $f_j, g_j$ being holomorphic. In particular, we show that such a function must be pluriharmonic if it is sufficiently smooth and bounded. We also settle an open question about $\mathcal{M}$-harmonic functions. Our proofs employ techniques and results from function and operator theory as well as partial differential equations.
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