In addition,we studied the relation between symmetric matrix and sub-involutory matrix,and the relation between symmetric matrix and sub-orthogonal matrix,which have been proved theoretically.

• 研究了次对称矩阵的性质,次对称矩阵与次对合矩阵,次正交矩阵的关系,并加以理论证明,得到了一些重要的结论。