摘要
利用Ｒｉｅｍａｎｎ 浸没的方法，给出了复射影空间和四元数射影空间中紧致的具有平行平均曲率向量的子流形为全脐子流的Ｐｉｎｃｈｉｎｇ 常数－
By means of Riemann submersion, the pinching constant on the compact submanifold of complex projective space and quaternionic projective space with parallel mean curvature as the totally umbilical is given
