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Sharp Higher Integrability Theory, Part I: The $L^p$-norm of the Beurling--Ahlfors transform
We confirm a conjecture posed by T. Iwaniec in 1982: the $L^p$ norm of the Beurling--Ahlfors transform is $p-1$ if $p\geq 2$, and $(p-1)^{-1}$ if $1<p\leq 2$.
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