On the morning of May 31, Ming Xu's stamp products donation event was held at CIM. Mr. Ming Xu is a well-known artist and stamp designer, also a member of the 12th Tianjin Municipal Committees of the CPPCC and the president of Alumni Association of Tianjin Yaohua High School. Attendees included Former President of Nankai University Prof. Zixin Hou, Director of Chern Institute of Mathematics Prof. Chengming Bai, Vice Director of Chern Institute of Mathematics Aifang Chen, Dean of the School of Mathematical Sciences Prof. Longyun Ding, Prof. Su Gao from the School of Mathematical Sciences, representatives of mathematics students and families of Mr. Ming Xu.

Mr. Ming Xu shared his stories of the bonds between him and Prof. Shiing-Shen Chern as well as Nankai University which were all built through stamp products. Then he donated to CIM the commemorative envelope signed by Prof. Shiing-Shen Chern and his families which was designed to celebrate the first issue of the personalized stamps in memory of Shiing-Shen Chern and the 80th anniversary of Nankai University, along with the personalized stamps designed to celebrate the 30th anniversary of CIM. All designed by Mr. Ming Xu himself, these stamp products are all very precious; combined with related letters, invoices and photos, they will for sure add great value to CIM's historical materials collection.

Director of CIM Prof. Chengming Bai presented Mr. Ming Xu with a donation certificate, together with the book Biography of S.S.Chern and the calendar "The Beauty of Mathematics", which was designed by Prof. Shiing-Shen Chern, as gifts for expressing appreciation. Prof. Zixin Hou, Prof. Su Gao and representatives of mathematics students all gave their speeches of thanks. After the event, Mr. and Mrs. Xu were invited to visit Ningyuan, the former residence of Professor Shiing-Shen Chern.