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题目:Modular Invariance in Conformal Field Theory报告人:董崇英 (加州大学教授)时间: 2016年5月11日(周三) 10:30-11:30地点：致远楼107室欢迎广大师生参

What is the flow in the center manifold and homoclinc manifold? We consider famous generalized Henon-Heiles(H-H) system. For the three integrable cases, on the basis of the investigation of the dynamical behavior and level curves of the planar dynamical systems, we find all possible explicit exact parametric representations of solutions in the invariant manifolds of the four dimensional phase space. These solutions contain quasi-periodic solutions, homoclinic solutions, periodic solutions as well as blow-up solutions.

The investigations of age structures in population growth via differential systems are presented from three aspects: modeling, model reduction and application. The structured population growth is normally described by a PDE equation equipped with an appropriate boundary condition and initial date. However, various ordinary/functional differential systems can be reduced from the general PDE equation with respective biological assumptions. This talk will present some delay differential equations to describe predator-prey interaction, population growth with inter- and intra- specific competition, and size-structured population growth.

In this talk we propose a prey-predator model in multiple patches through the stage structured maturation time delay with migrations among patches. Focus on the case with two patches, we discuss the existence of equilibrium points and the uniform persistence. In particular, when the maturation times are the same in the patches, we study the local and global attractivity of boundary equilibrium point with general

题目：An Extension of Feller's Strong Law of Large Numbers报告人：Professor Li Deli Department of Mathematical Sciences Lakehead University, Canada (加拿大Lakehead大学数学科学系教授）时间：2016年4月27日（周三）上午10:00开始地点：宁静楼104室欢迎广大师生前来参

题目：Spectral Hypergraph Theory Via Tensors.报告人：祁力群教授 (香港理工大学数学系 )时间: 2016年4月14日(周四)下午16:00.地点: 致远楼107室.欢迎大家前往听讲

学 术 报 告题目：More Dynamical Properties Revealed in A 3D Chaotic System报告人：李先义 教授 （扬州大学）时间：4月8日（星期五），下午 3:30-4:30地点：致远楼102室李先义，现任职扬州大学教授， 主要研究常微分方程与动力系统。至今在Nonlinear Dyn., IJBC, JMAA, CMA等著名期刊发表科研论文近60篇。主持包括国家自然科学基金面上项目、数学天元基金、国家留学基金等各级各类科研项目等21项。曾先后被评为“湖南省青年...

题目：平均法与Melnikov函数法的等价性报告人：韩茂安 教授 （上海师范大学）时间：4月8日（星期五），下午 2:30-3:30地点：致远楼102室韩茂安，教授，博导，现任上海师范大学数学科学研究所所长、上海师范大学数理信息学院副院长，主要从事常微分方程与动力系统的研究。作为负责人主持完成了5项国家自然科学基金项目，5项省部级基金项目，并入选2004年度教育部新世纪优秀人才培养计划和2006年度上海市学优秀科带头人支持计划；...