A quasi-local mass for 2-spheres with negative Gauss curvature  

作　　者：ZHANG Xiao Institute of Mathematics, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100080, China 

出　　处：《Science China Mathematics》2008年第9期1644-1650,共7页中国科学：数学（英文版）

基　　金：partially supported by the National Natural Science Foundation of China (Grant No. 10421001);the National Key Basic Research Project of China (Grant No. 2006CB805905);the Innovation Project ofChinese Academy of Sciences

摘　　要：We extend our previous definition of quasi-local mass to 2-spheres whose Gauss curvature is negative, and prove its positivity.We extend our previous definition of quasi-local mass to 2-spheres whose Gauss curvature is negative, and prove its positivity.

关 键 词：general relativity quasi-local mass POSITIVITY 53C27 53C50 83C60 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]