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Li Daqian (Li Tatsien), mathematician and professor of Fudan University, academician of the Chinese Academy of Sciences (1995—), fellow of the Third World Academy of Sciences (1997—), foreign member of the French Academy of Sciences (2005—).
He was born on November 10, 1937, in Nantong, Jiangsu Province, China. Since graduated from the Department of Mathematics, Fudan University in 1957, he has been serving on its teaching staff up to the present. His inservice graduate study at the university finished in 1966. Visiting scholar at Collège de France, Paris, France, from January 1979 to April 1981. Promoted to full professorship in 1980 and becoming Ph. D. Supervisor for pure mathematics and applied mathematics in 1981 and 1983 respectively. Appointed as dean of Graduate School of Fudan University from 1991 to 1999.
Professor Li is now the codirector of the Institut SinoFrancais de Mathématiques Appliquées (ISFMA) since 1998, the president of the China Society for Industrial and Applied Mathematics (CSIAM) since 2000, the officeratlarge of the International Council for Industrial and Applied Mathematics (ICIAM) since 2003 and the vicepresident of the Shanghai Association for Science and Technology since 1996. He was the vicepresident of the Chinese Mathematical Society from 1996 to 2003 and a member of the Conseil dEnseigment of the Ecole Polytechnique from 1997 to 2003.
Actively engaged in mathematical research and dedicated to a close combination of basic theory with practical applications, Professor Li has successfully achieved a large number of important results in his research:
1. He has established a complete theory on the local solvability for classical solutions and classical discontinuous solutions to the general 1D quasilinear hyperbolic system.
2. He has made an essential contribution on global classical solutions and global classical discontinuous solutions to 1D quasilinear hyperbolic systems.
3. He has proposed a simple and unified framework—the global iteration method and a complete result is then derived on the global existence and the lifespan of classical solutions to fully nonlinear wave equations for any space dimension n(≥1) and for any integer order p(≥2) of the nonlinear righthand side.
4. He has introduced the boundary value problem with equivalued surface and the homogenization of boundary conditions, and established an integrated theory. A unified mathematical model based on these concepts is formed and highly efficient numerical scheme is designed for various types of resistivity wellloggings. This result has been actually employed by more than 10 domestic oil fields, bringing about better geological interpretation and considerable economic benefits.
5. By establishing the theory on the semiglobal C1 solution to quasilinear hyperbolic systems, Prof. Li has solved the problem of exact controllability for 1D quasilinear hyperbolic systems with general nonlinear boundary conditions. This result gives a complete theory on the exact controllability in the quasilinear case. Successful applications are given to 1D quasilinear wave equations and to unsteady flows in a treelike network of open canals.
Prof. Li has received one Second Prize and one Third Prize of National Natural Sciences from the state, one First Prize of Scientific and Technological Progress from the State Education Commission, one First Prize of Scientific and Technological Progress from Shanghai Municipality, one first National Award and one Exceptional Shanghai Award for Teaching Achievements in Higher Education. Two of his works are awarded as Excellent University Textbooks from the State.
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