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.

He used to be the head of the national postgraduate entrance examination Beijing mathematics marking group. He participated in the revision of the mathematics syllabus for postgraduate entrance examination and the proposition work of the national mathematics examination for many times and was received by the leaders of the Ministry of Education.

Teacher Li Yongle compiled many reference books on mathematics for postgraduate entrance examination, which enjoyed a high reputation among candidates and were out of stock year after year. Teacher Li knows the questions and the key points of the exam like the back of his hand. His thinking of solving problems is extremely flexible, and his counseling is highly targeted, with excellent results and remarkable achievements. He was praised by the students!

Linear algebra is a branch of mathematics, and its research objects are vectors, vector spaces (or linear spaces), linear transformations and linear equations with finite dimensions. Vector space is an important subject in modern mathematics.

Therefore, linear algebra is widely used in abstract algebra and functional analysis; Through analytic geometry, linear algebra can be expressed concretely. The theory of linear algebra has been extended to operator theory. Because the nonlinear model in scientific research can usually be approximated as a linear model, linear algebra is widely used in natural science and social science.