学术报告
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Alperin Conjecture, modular permutation representations and their application...In the first lecture, I will discuss an extension of the Alperin weight conjecture to permutation modules M of a finite group. By introducing relative projectivity and the theory of vertices and sources, we may partition the set of primitive idempotents of End(M) in terms of their defect groups. In this way, we may provide a classification of simple modules of End(M).杜杰教授数学系(致远楼)1072015年6月30日(周二)14:50-15:50
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Propagation phenomena for a reaction advection diffusion competition model in...In this talk, I will report our recent research on a reaction-advection- diffusion competition model in a periodic habitat. We first investigate the global attractivity of a semi-trivial steady state (i.e., the competitive exclusion) for the periodic initial value problem. Then we establish the existence of the rightward spreading speed and its coincidence with the minimal wave speed for spatially periodic rightward traveling waves. Further, we obtain a set of sufficient conditions for the rightward spreading speed to be linearly determinate. Finally, we apply the obtained results to a prototypical reaction-diffusion model. This is a joint work with Dr. Xiaoqiang Zhao.余虓 博士南校区一教5196 月 26 日(星期五),下午 1:30-2:30
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Some algebraic aspects of designs and geometryI will talk about the application of algebraic and number theoretical methods in the study of two combinatorial structures: difference sets in design theory and Cameron-Libler line class in finite geometry. The first concerns the multiplier conjecture, while the other has its origin in the study of permutation groups. What they have in common is that results from algebraic number theory plays important role in the proof. The second part is a joint work with Koji Momihara and Qing Xiang.冯涛特聘研究员致远楼1026月23日 10:00-11:00
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A defect relation for holomorphic curves intersecting general divisors in pro...In this talk, I will establish a defect relation for holomorphic curves intersecting general divisors in projective varieties. Various consequences will be discussed.汝敏 教授致远楼 107 室2015年6月19日(周五),16:00--17:00
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Preserver problems学术报告题目: Preserver problems报告人: 李志光(Chi-Kwong Li)教授, 美国威廉玛丽学院摘要: Preserver problems concern the study of the characterizations of transformations on matrices or operators having some special properties such as leaving invariant certain functions, subsets, or relations. The study has motivations from theoretical and applied problems. We will give an introduction of the to...李志光致远楼1026月18日(周四) 16:00
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On the rotation- two- component- Camassa-Holm system modelling the equatorial...学术报告报告人:刘跃教授(University of Texas at Arlington)题目: On the rotation- two- component- Camassa-Holm system modelling the equatorial water waves时间:2015年6月17日(星期三)下午10:00—11:00地点:数学系致远楼102欢迎各位参加刘跃教授数学系致远楼1022015年6月17日(星期三) 下午10:00—11:00
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The Holder continuity of the solution map to the Camassa - Holm equation in w...学术报告报告人:张平正教授(江苏大学)题目: The Holder continuity of the solution map to the Camassa - Holm equation in weak topology时间:2015年6月17日(星期三)上午10:30—11:30地点:数学系致远楼102欢迎各位参加张平正教授(江苏大学)数学系致远楼1022015年6月17日(星期三) 上午10:30—11:30
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Traveling Wave Solutions for Diffusive Predator-Prey Systems IThe reaction-diffusion systems, which have been frequently used as the models for many problems in physics, chemistry and biology, can give rise to an important solutions – the wave solutions. In this talk we begin with a brief introduction to the history and development of research done on the traveling waves solutions for reaction-diffusion systems, such as the shooting method, monotone iteration for monotone systems, perturbation approach, and application of Schauder’s fixed point theorem. We then present a recently developed method to study the existence of traveling wave fronts for a general class of models of predator-prey interaction described by reaction-diffusion systems. Our approach consists of a geometrical shooting argument and an analytic method by the construction of a Liapunov function and the use of Lasalle's invariance principle. Our approach can be extended to larger class of reaction-diffusion systems,黄文璋 教授致远楼102室6 月 17 日(星期三),下午 1:30-2:50