Tian, Gang
Zhu, Xiaohua
Article History
Received: 2 September 2025
Accepted: 5 January 2026
First Online: 15 March 2026
Ethics
: Conflict of Interest Xiaohua Zhu is an editorial board member/managing editors/editor-in-chief for Acta Mathematica Sinica, English Series and was not involved in the editorial review or the decision to publish this article. The authors declare no conflict of interest.