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arXiv 1605.05511math.CAmath.FA
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并元希尔伯特变换的下界

Lower bounds for the dyadic Hilbert transform

Philippe Jaming, Elodie Pozzi, Brett D. Wick

摘要:

在本文中,我们寻求形式为$\left\Vert S f\right\Vert_{L^2(K)}\geq C(I,K)\left\Vert f\right\Vert_{L^2(I)}$的并元希尔伯特变换(Haar移位)的下界,其中$I$和$K$是两个并元区间,并且$f$支持$I$。如果$I\subset K$这样的界限存在,而在其他情况下,$K\subsetneq I$和$K\cap I=\emptyset$这样的界限仅在对$f$的导数的附加约束下可用。在后一种情况下,我们建立一个形式为$\left\Vert S f\right\Vert_{L^2(K)}\geq C(I,K)|\left\langle f\right\rangle_I|$的界,其中$\left\langle f\right\rangle_I$是$f$在$I$上的平均值。这为我们利用的通常的希尔伯特变换的类似问题提供了新的思路。

英文摘要:

In this paper, we seek lower bounds of the dyadic Hilbert transform (Haar shift) of the form $\left\Vert S f\right\Vert_{L^2(K)}\geq C(I,K)\left\Vert f\right\Vert_{L^2(I)}$ 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 $\left\Vert S f\right\Vert_{L^2(K)}\geq C(I,K)|\left\langle f\right\rangle_I|$ where $\left\langle f\right\rangle_I$ is the mean of $f$ over $I$. This sheds new light on the similar problem for the usual Hilbert transform that we exploit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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