主讲人：何震旭 教授（美国Lehigh大学）

时  间： 1月11日（周二）16：00-17：00

地  点：数学科学学院412教室

备  注： Positively or non-negatively curved manifolds have been of interest since the beginning of global Riemannian geometry. However the examples and construction methods are very limited. In this talk, I will review the known constructions and, obstructions under some further assumptions. I will also discuss some recent progress on them.