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Littlewood–Paley Characterizations of Second-Order Sobolev Spaces via Averages on Balls

Published online by Cambridge University Press:  20 November 2018

Ziyi He
Affiliation:
School of Mathematical Sciences, Beijing Normal University, Laboratory of Mathematics and Complex Systems, Ministry of Education, Beijing 100875, People’s Republic of China e-mail: ziyihe@mail.bnu.edu.cn e-mail: dcyang@bnu.edu.cn e-mail: wenyuan@bnu.edu.cn
Dachun Yang
Affiliation:
School of Mathematical Sciences, Beijing Normal University, Laboratory of Mathematics and Complex Systems, Ministry of Education, Beijing 100875, People’s Republic of China e-mail: ziyihe@mail.bnu.edu.cn e-mail: dcyang@bnu.edu.cn e-mail: wenyuan@bnu.edu.cn
Wen Yuan
Affiliation:
School of Mathematical Sciences, Beijing Normal University, Laboratory of Mathematics and Complex Systems, Ministry of Education, Beijing 100875, People’s Republic of China e-mail: ziyihe@mail.bnu.edu.cn e-mail: dcyang@bnu.edu.cn e-mail: wenyuan@bnu.edu.cn
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Abstract

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In this paper, the authors characterize second-order Sobolev spaces ${{W}^{2,p}}({{\mathbb{R}}^{n}})$ , with $p\,\in \,[2,\,\infty )$ and $n\,\in \,\mathbb{N}\,\text{or}\,p\,\in \,(1,\,2)\,\text{and}\,n\,\in \,\left\{ 1,\,2,\,3 \right\}$ , via the Lusin area function and the Littlewood–Paley $g_{\text{ }\!\!\lambda\!\!\text{ }}^{*}$ -function in terms of ball means.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 2016

References

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