研究单位球面中具有常平均曲率的超曲面。分别在假设或不假设第二基本形式的长度的平方为常数的情形下,证明了两个重要的拼挤定理。这些结论是Cheng(1996年)和Xu等(2011年)相应结果的推广。
The constant mean curvature hypersurfaces in unit sphere Sn+1 are considered. Under the hypothesis that the second fundamental form is constant or not, two important pinched theorems, which generalized corresponding results of Cheng (1996) and Xu et al (2011) , are obtained.