数学物理学报(英文版) ›› 2021, Vol. 41 ›› Issue (4): 1333-1365.doi: 10.1007/s10473-021-0419-3

• 论文 • 上一篇    下一篇

REGULARITY OF WEAK SOLUTIONS TO A CLASS OF NONLINEAR PROBLEM

周建丰1, 谭忠2   

  1. 1. School of Mathematical Sciences, Peking University, Beijing 100871, China;
    2. School of Mathematical Sciences, Xiamen University, Xiamen 361005, China
  • 收稿日期:2020-04-15 出版日期:2021-08-25 发布日期:2021-09-01
  • 作者简介:Jianfeng ZHOU,E-mail:jianfengzhou xmu@163.comZhong TAN,E-mail:ztan85@163.com
  • 基金资助:
    The first author is partially supported by the Postdoctoral Science Foundation of China (2019TQ0006); the second author is partially supported by the National Natural Science Foundation of China (11726023, 11531010).

REGULARITY OF WEAK SOLUTIONS TO A CLASS OF NONLINEAR PROBLEM

Jianfeng ZHOU1, Zhong TAN2   

  1. 1. School of Mathematical Sciences, Peking University, Beijing 100871, China;
    2. School of Mathematical Sciences, Xiamen University, Xiamen 361005, China
  • Received:2020-04-15 Online:2021-08-25 Published:2021-09-01
  • Supported by:
    The first author is partially supported by the Postdoctoral Science Foundation of China (2019TQ0006); the second author is partially supported by the National Natural Science Foundation of China (11726023, 11531010).

摘要: We study the regularity of weak solutions to a class of second order parabolic system under only the assumption of continuous coefficients. We prove that the weak solution $u$ to such system is locally Hölder continuous with any exponent $\alpha\in(0,1)$ outside a singular set with zero parabolic measure. In particular, we prove that the regularity point in $Q_T$ is an open set with full measure, and we obtain a general criterion for the weak solution to be regular in the neighborhood of a given point. Finally, we deduce the fractional time and fractional space differentiability of $D u$, and at this stage, we obtain the Hausdorff dimension of a singular set of $u$.

关键词: Parabolic system, regularity, weak solution, Hausdorff dimension

Abstract: We study the regularity of weak solutions to a class of second order parabolic system under only the assumption of continuous coefficients. We prove that the weak solution $u$ to such system is locally Hölder continuous with any exponent $\alpha\in(0,1)$ outside a singular set with zero parabolic measure. In particular, we prove that the regularity point in $Q_T$ is an open set with full measure, and we obtain a general criterion for the weak solution to be regular in the neighborhood of a given point. Finally, we deduce the fractional time and fractional space differentiability of $D u$, and at this stage, we obtain the Hausdorff dimension of a singular set of $u$.

Key words: Parabolic system, regularity, weak solution, Hausdorff dimension

中图分类号: 

  • 35D30