Abstract
We survey the recent solution of the so-called A 2 conjecture, that states: all Calderón–Zygmund singular integral operators are bounded on L 2(w) with a bound that depends linearly on the A 2 characteristic of the weight w. We also survey corresponding results for commutators. We highlight the interplay of dyadic harmonic analysis in the solution of the A 2 conjecture, especially Hytönen’s representation theorem for Calderón–Zygmund singular integral operators in terms of Haar shift operators. We describe Chung’s dyadic proof of the corresponding quadratic bound on L 2(w) for the commutator of the Hilbert transform with a BMO function, and we deduce sharpness of the bounds for the dyadic paraproduct on L p(w) that were obtained extrapolating Beznosova’s linear bound on L 2(w). We show that if an operator T is bounded on the weighted Lebesgue space L r(w) and its operator norm is bounded by a power α of the A r characteristic of the weight, then its commutator [T,b] with a function b in BMO will be bounded on L r(w) with an operator norm bounded by the increased power \(\alpha +\max \{ 1, \frac{1} {r-1}\}\) of the A r characteristic of the weight. The results are sharp in terms of the growth of the operator norm with respect to the A r characteristic of the weight for all 1<r<∞.
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Acknowledgements
The author would like to thank the organizers of the February Fourier Talks, at The Norbert Wiener Center for Harmonic Analysis and Applications, University of Maryland, for inviting her to deliver a talk in the fifth edition of the FFTs on February 18–19, 2010, that was the seed of this chapter. The author dedicates this chapter to the memory of her friend and mentor Cora Sadosky [1940–2010].
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Pereyra, M.C. (2013). Weighted Inequalities and Dyadic Harmonic Analysis. In: Andrews, T., Balan, R., Benedetto, J., Czaja, W., Okoudjou, K. (eds) Excursions in Harmonic Analysis, Volume 2. Applied and Numerical Harmonic Analysis. Birkhäuser, Boston. https://doi.org/10.1007/978-0-8176-8379-5_15
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