Vinland

Vinland

Wen Lan, born in March 1946 in Lanzhou, Gansu Province, native to Jingxian County, Anhui Province, is a mathematician, academician of the Chinese Academy of Sciences, academician of the Third World Academy of Sciences, professor and doctoral supervisor of School of mathematics of Peking University.

Wen Lan graduated from the Department of mathematical mechanics of Peking University in 1970; obtained a master's degree from the Department of mathematics of Peking University in 1981; obtained a doctor's degree from the Department of mathematics of Northwestern University in 1986; worked in the school of mathematics of Peking University in 1988; won the sixth Chen Shengshen Prize for Mathematics in 1997; was elected as an academician of the Chinese Academy of Sciences in 1999; and served as the president of the ninth Council of the Chinese Mathematical Society from 2004 to 2007 He was elected academician of the Third World Academy of Sciences in 2005 and won the 10th Hua Luogeng prize for Mathematics in 2011.

Wenlan is mainly engaged in the field of differential dynamical systems, and has made international contributions with his collaborators in the field of differential dynamical systems.

Character experience

Wenlan was born in March 1946 in Lanzhou, Gansu Province, and his native place is Jingxian, Anhui Province. Wen Lan graduated from the Department of mathematical mechanics of Peking University in 1970. In 1981, Wen Lan graduated from the Department of mathematics of Peking University with a master's degree. In 1986, Wenlan graduated from the Department of mathematics, Northwestern University, USA, with a doctorate. In February 1988, Wenlan worked as a postdoctoral researcher in Peking University. In July 1990, Wen Lan worked in the school of mathematics of Peking University, during which he made many academic visits to Northwestern University and other universities in the United States. In 1999, Wen Lan was elected academician of the Department of mathematics and physics of the Chinese Academy of Sciences. In 2005, Wen Lan was elected to the Third World Academy of Sciences.

Main achievements

Achievements in scientific research

Wenlan has done a lot of work on some basic problems in the field of differential dynamical systems, such as Williams conjecture of Nonexpansive attractors, C1 closure lemma of irreversible systems, stability conjecture of flows, C1 connection lemma, Palis density conjecture, etc. Relying on the power system seminar of Peking University, we will work with colleagues and students to combine western theory with Academician Liao Shantao's theory, and advance our research work to the international forefront. Wenlan solved the 26 year old problem of singularity free flow of the highest form of stability conjecture; solved the problem of characterization of systems far away from homoclinic tangent, which provides a common bridge for the main trend beyond hyperbolicity; and gave the characterization of minimal bifurcation sets of general systems far away from homoclinic branch, which lays an important foundation for the recent solution of Palis density conjecture The general principles of C1 disturbance and control trajectory migration along the trajectory are given, the different proofs of C1 connection lemma are given, and the C1 closed lemma of irreversible system is proved, which provides a foundation for the large-scale theory of irreversible system. Wen,L.TheC1closinglemmafornon-s ingularendomorphisms.ErgodicTheoryandDynamicalSystems ,1991,11(02). LanW.TheC1ClosingLemmaforNon -SingularEndomorphisms(eng).ProgressinNaturalScienceCommunicationofStateKeyLaboratoriesofChina,1991, 11(6):393-412. WenL.TheC1ClosingLemmaforEndomorphismswithFinitelyManySingularities .ProceedingsoftheAmericanMathematicalSociety,1992,114(1):217-223. WenL.Anosovendomorphismsonbranchedsurfaces .AcademicPress,Inc.1992. WenL.OntheC1StabilityConjectureforFlows .JournalofDifferentialEquations,1996,129(2):334-357. WenL, XiaZ.ABasicC1PerturbationTheorem .JournalofDifferentialEquations,1999,154(2):267-283. WenL,XiaZ.C1 ConnectingLemmas.TransactionsoftheAmericanMathematicalSociety ,2000,352(11):5213-5230. WenL.Homoclinictangenciesanddominatedsplittings .Nonlinearity,2002,15(5):1445---1469. GanS, WenL.HeteroclinicCyclesandHomoclinicClosuresforGenericDiffeomorphisms .JournalofDynamics&DifferentialEquations,2003,15(2-3):451-471. GanS, WenL.NonsingularstarflowssatisfyAxiomAandtheno - cyclecondition.InventionesMathematicae ,2006,164(2):279-315.

personnel training

Wen Lan thinks: with the vigorous development of Chinese mathematics, some new problems have also been encountered. In recent years, Chinese mathematicians have received a rapid increase in research funding, but sometimes, with more funding, good conditions, and a floating heart, there seem to be fewer scholars who are willing to do scientific research. In recent years, the number of papers, especially the number of SCI papers, is generally used to assess and evaluate mathematical work. The number of papers is indeed increasing, but it is really of great significance However, the achievements do not necessarily increase with it, which is still a difficult problem to be overcome. There is also the reform of mathematics teaching in primary and secondary schools. In recent years, there have been quite sharp debates in mathematics circles. As it has been related to the level of implementation, the problem has become a little urgent. The reform of mathematics teaching in primary and secondary schools is related to the next generation of the country, which is of great significance. I hope more people will care about this problem and try to make mathematics education in primary and secondary schools less detours.

Honorary recognition

Social service

Character evaluation

Wenlan is an academic leader of dynamical systems in China. He has made important contributions to some basic problems in the field of differential dynamical systems, such as Williams conjecture of Nonexpansive attractors, C1 closure lemma of irreversible systems, C1 connection lemma, stability conjecture of flows, singularity free flows, and Palis density conjecture. He is in the leading position in the world. (review of Hebei Normal University)