Its content may be separated into two parts . the first part contains chapter one and chapter two , which treat of the harmonic maps from surface into symplectic groups and quaternion grassmann manifolds . the second part contains chapter three and chapter four , which treat of local isometric immersions from space forms or riemannian products of space forms into space forms 全文分四章,內(nèi)容可分為兩部分:第一部分包括第一、二章,主要論涉從曲面到辛群及四元grassmann流形的調(diào)和映射;第二部分包括第三、四章,主要論涉從空間形式或空間形式的局部riemann積到空間形式的局部等距浸入。