Lower bounds for the dyadic Hilbert transform
Résumé
In this paper, we seek lower bounds of the dyadic Hilbert transform (Haar shift) of the form
$\norm{\Sha f}_{L^2(K)}\geq C(I,K)\norm{f}_{L^2(I)}$
where $I$ and $K$ are two dyadic intervals and $f$ supported in $I$. If $I\subset K$ such bound exist while in the other cases $K\subsetneq I$ and $K\cap I=\emptyset$ such bounds are only available under additional constraints on the derivative of $f$.
In the later case, we establish a bound of the form $\norm{\Sha f}_{L^2(K)}\geq C(I,K)|\scal{f}_I|$ where $\scal{f}_I$
is the mean of $f$ over $I$. This sheds new light on the similar problem for the usual Hilbert transform that we exploit.
Origine : Fichiers produits par l'(les) auteur(s)
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