不定空间形式中具平行平均曲率向量的类空曲面

摘要

研究2+p维不定空间形式N2p+p(c)中具有常数平均曲率的紧致类空曲面,将覃永安关于三维Riemann空间形式曲面具有的曲率拓扑特征推广到不定空间形式的类空曲面.%Studies the compact space-like surface with parallel mean curvature vector in an indefinite spaceform N2p+p ( c ) . Generalizes Qin Yong-an' s topological curvature characterization of surfaces in a 3-dimen-sional space form into a space-like surface in an indefinite space form N2p+p (c) .