He first talked about this breakthrough in a Peking Univ alumni meeting, and a preprint circulating in the field before he submitted to arXiv (https://drive.goo

He first talked about this breakthrough in a Peking Univ alumni meeting, and a preprint circulating in the field before he submitted to arXiv (https://drive.google.com/file/d/1vTLoh_Cpw6Zr436rD7FnjzND6ngY2VG8/view https://drive.google.com/file/d/1vTLoh_Cpw6Zr436rD7FnjzND6ng...). It's a 111 pages long proof.