射影性质
In this paper, some properties of totally real and totally umbilical submanifolds of a complex projective space are obtained. We also prove that a compact totally real submanifold with positive curvature and parallel mean curvature vector of a complex projective space must be pseudo-umbilical.
获得了复射影空间中全实全脐子流形的若干性质,并且证明了复射影空间中具有平行平均曲率向量的正曲率紧致全实子流形必是伪脐的。
We describe the properties of the almost split sequence containing projective module as the first term and the middle term.
本文刻划了包含投射模的几乎可裂序列,给出以投射模为首项和中间项的几乎可裂序列的特性。
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