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arXiv · 2611.08988

Finite-rank Toeplitz commutators on the harmonic Bergman space

Puyu Cui·Zengyong Huang·Yufeng Lu·Chao Zu
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Abstract

We completely characterize finite-rank commutators of Toeplitz operators with bounded harmonic symbols on the harmonic Bergman space of the unit disk. Apart from affine dependence, finite rank occurs precisely when both symbols are analytic with rational primitives, or both are coanalytic and their complex conjugates have rational primitives. Our approach combines a block-matrix decomposition with Luecking's theorem, which rules out nonzero finite-rank Toeplitz operators with bounded symbols on the Bergman space. In particular, every such finite-rank commutator has square zero.

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Puyu Cui, Zengyong Huang, Yufeng Lu, Chao Zu. 2026-11-06. Finite-rank Toeplitz commutators on the harmonic Bergman space. https://arxiv.org/abs/2611.08988

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