Abstract
We obtain a sharp norm estimate for Hankel operators with anti-analytic symbol for weighted Bergman spaces. For the classical Bergman space, the estimate improves the corresponding classical Putnam inequality for commutators of Toeplitz operators with analytic symbol by a factor of 1/2, answering a recent conjecture by Bell, Ferguson and Lundberg. As an application, this yields a new proof of the de Saint-Venant inequality, which relates the torsional rigidity of a domain with its area.
Original language | English |
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Pages (from-to) | 495-510 |
Number of pages | 16 |
Journal | Revista Matematica Iberoamericana |
Volume | 32 |
Issue number | 2 |
DOIs | |
Publication status | Published - 8 Jun 2016 |
Keywords
- Bergman spaces
- De saint-venant inequality
- Hankel operators
- Isoperimetric inequality.
- Putnam's inequality
ASJC Scopus subject areas
- General Mathematics