Improving Estimates for Discrete Polynomial Averages
Improving Estimates for Discrete Polynomial Averages
复制标题
改进离散多项式平均值的估计
DOI:
10.1007/s00041-020-09748-4
复制
发表时间:
2020
影响因子:
1.2
通讯作者:
Yang, Fan
中科院分区:
文献类型:
--
作者:
Han, Rui;Kovač, Vjekoslav;Lacey, Michael T.;Madrid, José;Yang, Fan
For a polynomialPmapping the integers into the integers, define an averaging operatoracting on functions on the integers. We prove sufficient conditions for the-improving inequality $$\begin{aligned} \Vert A_N f\Vert _{\ell ^q(\mathbb {Z})} \lesssim _{P,p,q} N^{-d(\frac{1}{p}-\frac{1}{q})} \Vert f\Vert _{\ell ^p(\mathbb {Z})}, \qquad N \in \mathbb {N}, \end{aligned}$$where. For a range of quadratic polynomials, the inequalities established are sharp, up to the boundary of the allowed pairs of (p,q). For degree three and higher, the inequalities are close to being sharp. In the quadratic case, we appeal to discrete fractional integrals as studied by Stein and Wainger. In the higher degree case, we appeal to the Vinogradov Mean Value Theorem, recently established by Bourgain, Demeter, and Guth.
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DOI:
--
发表时间:
2021
期刊:
影响因子:
--
作者:
R. Kesler;R. Kesler
通讯作者:
R. Kesler
DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
R. Kesler
通讯作者:
R. Kesler
DOI:
--
发表时间:
2000
期刊:
影响因子:
--
作者:
E. Stein;S. Wainger
通讯作者:
S. Wainger
影响因子:
3.9
作者:
A. Ionescu;S. Wainger
通讯作者:
S. Wainger
DOI:
--
发表时间:
2019
期刊:
影响因子:
--
作者:
R. Kesler;Darío Mena Arias
通讯作者:
Darío Mena Arias