We study strong stability of Nash equilibria in the load balancing game of m (m ≥2) identical servers, in which every job chooses one of the m servers and each jobwishes to minimize its cost, given by the workload of the server it chooses. A Nash equilibrium (NE) is a strategy profile that is resilient to unilateral deviations. Finding an NE in such a game is simple. However, NE-configurations are not stable against coordinated deviations of several jobs, while a strong Nash equilibrium (SE) is. We study how well an NE approximates an SE. Given any job assignment in the load balancing game, the improvement ratio (IR)of a deviation of a job is defined as the ratio between the pre- and post-deviationcosts. An NE is said to be ρ-approximate SE (ρ≥ 1) if there is no coalition of jobs such that each job of the coalition will have an IR more than ρ from coordinated deviations of the coalition

我们希望考虑箭图的拓扑结构对于由箭图决定的代数结构有什么样的影响。我们分两个方面来阐明这个问题：遗传代数上倾斜(tilting)模的倾斜箭图的亏格；有限变异(mutation)型下的丛(cluster)代数的箭图的亏格

报告人： Dr. Gechun LIANG （Oxford-Man Institute, University of Oxford）题目：A Continuous Time Structural Model for Insolvency, Recovery and Rollover Risks时间：2012年6月28日（星期四）下午2：00—3：00地点：数学系致远楼10

报告人：邓铿教授(University of Louisiana at Lafayette, USA）题目： On a nonautonomous juvenile-adult model时间：2012年6月28日(星期四)下午3：30—4：30地点：数学系致远楼10

报告人：Prof. Xingfu Zou(University of Western Ontario, Canada）题目： Avian Influenza Dynamics in Wild Birds with Bird Mobility and Spatial Heterogeneous Environment时间：2012年6月28日(星期四)下午4：30—5：30地点：数学系致远楼10

We consider Toeplitz operators on Bergman spaces on strongly pseudo-convex domains in and we prove that the commutators of Toeplitz operators with smooth symbols are in the weak Schatten class . We compute their Dixmier trace in terms of certain boundary Poisson brackets of the symbols. (Joint work with M. Englis).

Workshop Venue: Tongji University (Siping Road), Zhiyuan Building, Room 107，311Oganizer: Xiaochun FangScientific director: Huaxin LinSpecial Lectures:Huaxin Lin (University of Oregon , USA)Genkai Zhang (Chalmers University of Technology and Gothenburg University, SWEDEN)Speakers:Quanyuan Chen (Tongji University)Qingzhai Fan (Shanghai Maritime University)Jiajie Hua (Jiaxing College)Enran Hou (T...

报告人：王亚光教授（上海交通大学）题目：Study on Boundary Layers时间：2012年6月26日，星期二下午2：00—3：00地点：数学系致远楼10