题目：Ancient solutions of codimension two surfaces with curvature pinching in R^4

报告人：纪正超

时间：北京时间6月9日9:00-10:00

地点：腾讯会议（会议号：614 381 906 无密码）

摘要：We prove rigidity theorems for ancient solutions of geometric flows of immersed submanifolds. Specifically, we find conditions on the second fundamental form that characterize the shrinking sphere among compact ancient solutions for the mean curvature flow in codimension two surfaces, which is different from the conditions of Risa and Sinestrari in [28] and we also remove the condition that the second fundamental form is uniformly bounded when t ∈ (−∞,−1).