Abstract
I discuss the prescribed Jacobian equation \(Ju=\det \nabla u=f\) for an unknown vector-function u, and the connection of this problem to the boundedness of commutators of multiplication operators with singular integrals in general, and with the Beurling operator in particular. A conjecture of T. Iwaniec regarding the solvability for general datum \(f\in L^p(\mathbb {R}^d)\) remains open, but recent partial results in this direction will be presented. These are based on a complete characterisation of the L p-to-L q boundedness of commutators, where the regime of exponents p > q, unexplored until recently, plays a key role. These results have been proved in general dimension d ≥ 2 elsewhere, but I will here present a simplified approach to the important special case d = 2, using a framework suggested by S. Lindberg.
Dedicated to Professor Fulvio Ricci
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Acknowledgements
The author is supported by the Academy of Finland via project Nos. 307333 (Centre of Excellence in Analysis and Dynamics Research) and 314829 (Frontiers of singular integrals).
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Hytönen, T.P. (2021). Of Commutators and Jacobians. In: Ciatti, P., Martini, A. (eds) Geometric Aspects of Harmonic Analysis. Springer INdAM Series, vol 45. Springer, Cham. https://doi.org/10.1007/978-3-030-72058-2_13
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