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arXiv 2202.07154math.PRmath.FA
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Haar鞅变换的最优值域及其应用

Optimal range of Haar martingale transforms and its applications

Sergey Astashkin, Jinghao Huang, Marat Pliev, Fedor Sukochev, Dmitriy Zanin

摘要:

令$(\mathcal{F}_n)_{n\ge 0}$为$[0,1]$上的标准二元过滤。令$\mathbb{E}_{\mathcal{F}_n}$是从$ L_1=L_1[0,1]$到$\mathcal{F} _n$的条件期望,$n\ge 0$,令$\mathbb{E}_{\mathcal{F} _{-1}} =0$。利用经典的Calderón算子给出了由\begin{align*} Tf=\sum_{m=0}^\infty \left( \mathbb{E}_{\mathcal{F}_{2m}} f-\mathbb{E}_{\mathcal{F}_{2m-1}}f \right), ~f\in L_1, \end{align*}定义的鞅变换$T$的分布函数的精确估计.作为应用,对$[0,1]$上的给定对称函数空间$E$,我们确定了作用于$E$上的鞅变换/Haar基投影的最优Banach对称范围,即对称空间$\mathcal{S}_E$.

英文摘要:

Let $(\mathcal{F}_n)_{n\ge 0}$ be the standard dyadic filtration on $[0,1]$. Let $\mathbb{E}_{\mathcal{F}_n}$ be the conditional expectation from $ L_1=L_1[0,1]$ onto $\mathcal{F} _n$, $n\ge 0$, and let $\mathbb{E}_{\mathcal{F} _{-1}} =0$. We present the sharp estimate for the distribution function of the martingale transform $T$ defined by \begin{align*} Tf=\sum_{m=0}^\infty \left( \mathbb{E}_{\mathcal{F}_{2m}} f-\mathbb{E}_{\mathcal{F}_{2m-1}}f \right), ~f\in L_1, \end{align*} in terms of the classical Calderón operator. As an application, for a given symmetric function space $E$ on $[0,1]$, we identify the symmetric space $\mathcal{S}_E$, the optimal Banach symmetric range of martingale transforms/Haar basis projections acting on $E$.

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