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- W2968203414 abstract "Abstract Let $X$ be a given Banach space, and let $M$ and $N$ be two orthogonal $X$-valued local martingales such that $N$ is weakly differentially subordinate to $M$. The paper contains the proof of the estimate $mathbb E Psi (N_t) leq C_{Phi ,Psi ,X} mathbb E Phi (M_t)$, $tgeq 0$, where $Phi , Psi :X to mathbb R_+$ are convex continuous functions and the least admissible constant $C_{Phi ,Psi ,X}$ coincides with the $Phi ,Psi $-norm of the periodic Hilbert transform. As a corollary, it is shown that the $Phi ,Psi $-norms of the periodic Hilbert transform, the Hilbert transform on the real line, and the discrete Hilbert transform are the same if $Phi $ is symmetric. We also prove that under certain natural assumptions on $Phi $ and $Psi $, the condition $C_{Phi ,Psi ,X}<infty $ yields the UMD property of the space $X$. As an application, we provide comparison of $L^p$-norms of the periodic Hilbert transform to Wiener and Paley–Walsh decoupling constants. We also study the norms of the periodic, nonperiodic, and discrete Hilbert transforms and present the corresponding estimates in the context of differentially subordinate harmonic functions and more general singular integral operators." @default.
- W2968203414 created "2019-08-22" @default.
- W2968203414 creator A5064007806 @default.
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- W2968203414 date "2019-08-07" @default.
- W2968203414 modified "2023-10-18" @default.
- W2968203414 title "The Hilbert Transform and Orthogonal Martingales in Banach Spaces" @default.
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- W2968203414 doi "https://doi.org/10.1093/imrn/rnz187" @default.
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