应学院及我院胡泽军教授的邀请，华南师范大学魏国新教授、河南师范大学李兴校教授和黄广月教授将于5月24-26日前来郑州大学进行学术访问，并就共同感兴趣的微分几何课题展开深入地交流与研讨。访问期间，魏国新教授、李兴校教授和黄广月教授将分别做学术报告。报告的具体安排如下：

一．报告题目：Some recent results on Lagrangian \xi-submanifolds of C^2

报告人：李兴校教授

时间：2019年5月24日（星期五）下午15:00—16:00.

内容提要：\xi-submanifolds are natural generalization of both self-shrinkers of mean curvature flow and \lambda-hypersurfaces. They are critical points of weighted volume functionals under some kind of restricted variations. In this talk, we consider Lagrangian \xi-submanifolds of the complex Euclidean space C^2 and report some relevant rigidity and classification theorems obtained recently. These are joint work with Ruiwei Xu and other co-workers.

二．报告题目：Some rigidity results on critical metrics for quadratic functionals on manifolds

报告人：黄广月教授

时间：2019年5月24日（星期五）下午16:00—17:00.

  内容提要：In this talk, we will introduce some recent results for the Einstein metrics as the critical points of a family of known quadratic curvature functional on closed manifolds. Moreover, we also provide some rigidity results for such metrics characterized by some inequalities involving the Weyl curvature tensor and the trace-less Ricci curvature. For closed manifolds with special geometrical structures such as manifolds with Bach-flat metric or with harmonic Riemannian curvature tensor, some further rigidity results are also proved.

三．报告题目：Complete \lambda-hypersurfaces in R^{n+1}

 报告人：魏国新教授

 时间：2019年5月24日（星期五）下午17:00—18:00.

    内容提要： In this talk, we introduce rigidity theorems, examples, the stability and classification theorems of complete \lambda-hypersurfaces in Euclidean space.

报告地点：数学与统计学院教学楼310报告室

欢迎广大师生参加。