Ding, Jian
Gwynne, Ewain
Article History
Received: 27 March 2022
Accepted: 7 November 2023
First Online: 5 January 2024
Ethics
: <b>Conflict of Interest</b> J.D. is a member of Editorial Board of Frontiers of Mathematics and was not involved in the editorial review or the decision to publish this article. The authors declare no conflict of interest.