Lin-Lu-Yau introduced a notion of Ricci curvature for graphs and obtained a complete classification for all Ricci-flat g......

Lott,Sturm和Villani给出了度量测度空间Ricci曲率下界的定义,之后Ambrosio,Gigli和Savare又将Jordan,Kinderlehrer和Otto的欧式空......

本文通过改进球面中极小子流形的Ricci曲率的拚挤常数,修正了Ogiue,K. 的不正确论断.同时还给出了三维球面中极小拓扑环的曲率特征......