Notices of the International Congress of Chinese Mathematicians

Volume 7 (2019)

Number 2

Open problems

Pages: 72 – 73



Kefeng Liu (University of California at Los Angeles)

Hao Xu (Zhejiang University, Hangzhou, Zhejiang, China)

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This column is edited by Pengfei Guan (McGill University), Yizhao Hou (Caltech), Jun Li (Stanford University), Kefeng Liu (UCLA), Zhouping Xin (Chinese University of Hong Kong), Hao Xu (Zhejiang University; Managing editor), Shing-Tung Yau (Harvard University), Zhiwei Yun (MIT), and Wei Zhang (MIT). The readers are welcome to propose the solutions. The authors may send their solutions to Hao Xu ( and post the solutions in MathSciDoc (http://archive.ymsc.tsinghua. The correct solutions will be announced and some souvenirs will be awarded.

Published 8 August 2019