Teacher Li Yongle claimed that he was over 80 years old, but he didn't specify the details of his over 80 years old. In his early years, Li Yongle was called "the king of line generation". The students' reputation and profound knowledge are really admirable.
Li Yongle, male, is a famous expert in linear algebra. Professor, Department of Applied Mathematics, Tsinghua University, Vice Chairman of Mathematics Research Association of Beijing Higher Education Society.