/kloc-0 joined the work in June, 1949./kloc-0 graduated from the Department of Mathematics of Hebei Normal University in June, 1958. 1958 graduated from the Mathematics Department of Hebei Normal University. The professor is at 1983. He is a deputy to the Seventh National People's Congress. He once served as member of the Standing Committee of the Party Committee of Inner Mongolia Normal University, deputy director of the Department of Mathematics, deputy director of the Academic Committee of Inner Mongolia Normal University, deputy director of the Mathematical Society of Inner Mongolia Autonomous Region, and deputy director of the Natural Science Foundation of Inner Mongolia Autonomous Region. He is currently the director of the Institute of Mathematics and a commentator of the American Mathematical Review. Professor Ligeng Si from Ligeng Si has been engaged in mathematics teaching and research for decades. He has been engaged in the research on the stability theory of dynamic systems with delay differential equations for a long time, and has made many breakthroughs and made outstanding contributions to the development of this theory. 1960- 1962 studied in the mathematics department of Nankai university for two years. He has served as deputy director of the Department of Mathematics of Inner Mongolia Normal University, deputy director of the academic committee of the school, deputy director of the Inner Mongolia Natural Science Foundation Committee, and deputy to the Seventh National People's Congress. He is currently the director, professor and editorial board member of the Mathematics Research Office of Inner Mongolia Normal University, a member of the American Mathematical Society and a commentator of the American Mathematical Review. He teaches mathematical analysis and differential equations, engages in the research of motion stability theory, is the leader of differential equations, and has trained many graduate students. In 1960s, he broke away from convention and avoided constructing Lyapunov function, thus solving the problem of judging the stability of delay and neutral differential equations with variables. In 1980s, his inference of partial results of neutral differential difference equations partially solved the asymptotic behavior of solutions of linear differential difference equations proposed by Bellman, a famous American mathematician, in 1965. The 1990s. He also opened up a new research field of "delay differential inequality", created a series of delay differential inequalities, and then gave a variety of criteria for delay differential equations. He presided over six scientific research projects, including the National Natural Science Foundation and the Natural Science Foundation of the Autonomous Region. Published 60 academic papers on mathematics in academic journals at home and abroad. 1994, his monograph "Motion Stability of Neutral Time-delay Systems" was officially published. This book is the second monograph devoted to neutral delay differential equations in the world. He has won the third prize of Inner Mongolia's scientific and technological progress (1980), the second prize of Inner Mongolia's scientific and technological progress (1988), the first prize of Inner Mongolia's scientific and technological progress (1992), the special contribution prize of Inner Mongolia's education system (1987) and the second prize of Inner Mongolia's outstanding teaching achievements (/). The State Education Commission was awarded as a scientific and technological expert with outstanding contributions in Inner Mongolia Autonomous Region, 1989 as a model worker in Inner Mongolia Autonomous Region, 1998 as a model worker in the national education system and a national model teacher, and 1999 as a national "May Day". From 199 1 year, enjoy the special allowance issued by the State Council. . Published monograph "Motion Stability of Neutral Time-delay Systems", teaching material "Lecture Notes on Ordinary Differential Equations" and so on. Published more than 40 papers. 1980, 1988 and 1992 won the third, second and first prizes of Inner Mongolia Science and Technology Progress Award respectively, 1987, 1989 and 1993 won the Special Contribution Award of Inner Mongolia Education System respectively. 1988 and 1989 were respectively rated as excellent scientific and technological experts and model workers in Inner Mongolia. Enjoy special government allowance. It has been included in English Directory of Modern Minorities in China, swointwor 1d of WHO, MenofAchievement, etc.