After witnessing the backwardness and decline of the Qing Dynasty in the Opium War, Wei Yuan spent 1 1 year putting forward the idea of "learning from foreigners to control foreigners" in the Atlas of the Sea, saying that he would send people to learn advanced industrial technology and military technology from western capitalist countries to arm himself against western powers. Although the Reform Movement of 1898 led by Tan Sitong and others failed because of the interference of powerful forces, Tan Sitong still made a generous patriotic speech of "intentional killing thieves, powerless to return to heaven, dying in a proper place, quick and quick" before going to righteousness. Time flies, at that time, countless aspiring young people crossed the ocean to find a way out for the country. After receiving profound knowledge, they still returned to the devastated motherland, relying on that patriotic blood. However, in modern times, many domestic talents have been lost to foreign countries, and four talents from the Department of Mathematics of Peking University have gone to the United States to study, and they will never return. What is the current situation?

Since 1977 China resumed the college entrance examination, China has invested more and more in education every year, and spent a lot of effort on training high-tech talents. Peking University and Tsinghua have always been the top two universities in the eyes of China students. China has invested a lot of teaching resources in these two universities, and these two universities are also very competitive and have trained many excellent students.

The mathematics department of Peking University is a top-notch existence, and every student in the department has super strength. After 2000, there appeared four top-notch talents in the Department of Mathematics of Peking University, who are also called the four talents in the Department of Mathematics of Peking University. These four gifted scholars are Xu Chenyang, Zhu Xinwen, Zhang Wei and Yun Zhiwei. They are all excellent and have won numerous awards in the field of mathematics.

If these four talents can stay and develop in China, the state will definitely give them the highest assistance. However, they are unwilling to do so. All four people have a common desire to go to the United States for development. It is true that China at that time was much worse than the United States in all aspects. It is understandable that they made such a choice. After graduating from Peking University, four talents went to the United States to study and never came back. What's the status quo of the four of them?

Four people who went to the United States for further study refined their knowledge of mathematical theory more systematically, and they all successfully obtained their doctorates. After finishing their studies, four people also continued to work abroad, but among these four people, one has returned to China for several years, and that person is Xu Chenyang. Xu Chenyang returned to Peking University and became a teacher. After teaching at Peking University for six years, he resolutely resigned and went to the United States again, and then went to MIT to teach. Four talented scholars from the Department of Mathematics of Peking University got together again, and so far no one has returned to China.

This brain drain is undoubtedly a great loss for China, but things are getting better. In recent years, with the rise of China's strength, more and more outstanding international students choose to return to China to develop and serve their country after studying abroad, which is indeed a very good phenomenon for us.