本讲将沿一条主线介绍多复变的简史、基本内容及新近进展

In this talk, after I recall classical finite elements of high order partial differential equations, I will present some new results in this direction, including a family of first order Hm conforming finite elements on tensor product grids in any dimension, a family of first order Hm nonconforming finite elements on triangular grids in two dimension, and two second order H2 nonconforming finite elements, and some new theories for error estimates.

题目：模表示论新进展报告人：张继平教授（杰青、北京大学国际数学中心执行副主任）时间：2017年4月6日 16:00-17:00地点：致远楼107室报告人简介：张继平，北京大学教授、博士生导师、国家杰出青年基金获得者、长江学者奖励计划特聘教授、国家级有突出贡献的中青年专家、全国优秀科技工作者、全国五一劳动奖章获得者、北京市十大杰出青年，他曾获国家自然科学奖、教育部科技进步一等奖、“求是”杰出青年学者奖、中国青年科学家...

In this talk we will give a sufficient and necessary condition on parabolic isometries of positive translation lengths on complete visibility CAT(0) spaces. One consequence is that each parabolic isometry of a complete simply connected visibility manifold of nonpositive sectional curvature has zero translation length. Applications on the geometry of open negatively curved manifolds will also be discussed

There are many fundamental and practical problems involving a wide range of length scales. The multiscale feature leads to great challenges for computation. Multiscale finite element method (MsFEM) is one of efficient approaches to solve the multiscale problems. The talk is devoted to presenting some progress in MsFEM with porous media application. To enhance the applicability and flexibility, we particularly introduce a least－squares mixed generalized MsFEM. Some numerical results are presented for flows in porous media

题目：Optimal Dividend and Investment Problems under Sparre Andersen Model报告人：柏丽华 博士 (南开大学)时间：2017年3月13日(星期一)下午3：00—4：00地点：致远楼102室欢迎各位参加

SYZ transformation is a geometric way to understand mirror symmetry , which is of great importance in geometry and physics. In this talk, Professor Conan Leung will discuss the history and his recent work on this “hot” topic.

We proposed a two-component generalization of the the Degasperis-Precesi equation. Firstly, under a pseudo 3-reduction, we have shown that the two-component reduced Ostrovsky equation can be reduced from an extended BKP hierarchy through a hodograph transformation. Its bilinear form and N-soliton solution in terms of pfaffians are constructed. One- and two-soliton solutions are presented. Moreover, we give a two-component generalization of the Degasperis-Precesi equation its Lax pair.