The authors characterize the forms of additive invertable operators preserving inverse matrix of the upper triangular matrix space over a field which characteristic is not 2 or 3 .
刻划了特征不为2及3的域上的上三角矩阵空间保逆矩阵的可逆加法算子的形式。
2
X-type molecular sieves are synthesized by using polymer methylcellulose as a space-confined additive.
以聚合物甲基纤维素作空间位阻剂合成了X型分子筛。
3
To meet the requirements of well cementing fors mall borehole and small annular space, the composite plastic fluid loss additive PT-2 was studied.