Yang Le studied in the Department of Mathematical Mechanics of Peking University from 1956. 1962 After graduation, he was admitted to the Institute of Mathematics of China Academy of Sciences for postgraduate study. 1966 engaged in mathematics research after graduation. In the meantime, 1977 was an associate researcher, 1979 was a researcher, 1982 was the deputy director of the Institute of Mathematics, and 1987 was the director of the Institute of Mathematics. He was elected as a member of the 6th, 7th and 8th CPPCC, vice-chairman of the 5th and 6th All-China Youth Federation, member of the 3rd and 4th Standing Committee of the National Committee of China Association for Science and Technology, and executive director, secretary-general and chairman of the Chinese Mathematical Society. He successively served as a member of the Third the State Council Academic Degrees Committee, the First, Second, Third and Third the State Council Academic Degrees Committees, the Fund Committee of China Academy of Sciences, the Third and Fourth National Natural Science Awards Committees, the editor-in-chief of Journal of Mathematics, and the editorial boards of Mathematical Achievements, China Science and Science Bulletin. 1980 1 1 was elected as a member of the Department of Mathematical Physics of China Academy of Sciences.
Yang Le made a systematic and in-depth study of complex analysis, especially the value distribution theory of whole functions and meromorphic functions, and his achievements were highly praised and widely quoted by colleagues at home and abroad. The main research results are as follows: (1) The relationship between the deficient values of whole functions and meromorphic functions and Poirot direction is studied in cooperation, and a close and accurate relationship between these two basic concepts is established for the first time; The total deficiency of meromorphic functions and their derivatives is estimated accurately, and several questions raised by D. Drasin are answered. The concept of deficient function is introduced, and it is proved that the deficient function subordinate to meromorphic function can be counted at most, and the deficiency is estimated appropriately. This topic attracted the attention of international counterparts in the 1980s. In this paper, the singular direction of meromorphic functions is deeply studied, a new singular direction is introduced, and the necessary and sufficient conditions for the distribution of singular direction are given (some work is done in cooperation with others); The normal families of holomorphic functions and meromorphic functions are studied systematically, some new normal rules are obtained, and the relationship between normal families and fixed points is established. In cooperation with famous British mathematicians, the normal families of holomorphic functions and meromorphic functions in angular domain are systematically studied, some new normal rules are obtained, and the relationship between normal families and fixed points is established. In cooperation with the famous British mathematician, this paper studies the growth and value of holomorphic functions in angular domain, and solves a conjecture of the famous mathematician Littlewood. It is proved that if the whole function of finite lower order is μ, if the number of Boller directions with order not less than μ is investigated, the sum of it and the number of investigated non-zero defects of all original functions at all levels does not exceed 2μ; It also greatly reduces the coefficients of the two principal terms of Hyman's basic inequality, which has become the best achievement of this subject at present. 1978 won the national science conference award, and 1982 and Zhang Guanghou won the second prize of national natural science.
Over the years, Yang Le has published more than 60 academic papers, 2 monographs and 5 essays. The monograph won the first prize of 1983 national excellent scientific and technological books and the first national book award (1994).
Since 1979, Yang Le has served as a visiting professor at Cornell University, Purdue University, Royal Swedish Institute of Science, Princeton Institute for Advanced Studies, Harvard University and Notre Dame University, and has been invited to give academic lectures at more than 50 universities and scientific research institutions in the United States, Britain, the Soviet Union, Germany, Japan, Sweden, Finland and other countries, and delivered themes at 10 international academic conferences.