摘要
提出了次酉矩阵的概念，研究了它的基本性质及其与（ 反） 次Ｈｅｘｍｉｔｅ阵的关系。将正交阵的广义ｃａｙｌｅｙ
An introduction to sub unitary matrix and its properties are presented,and the relation between sub unitary matrix and (anti )sub Hermite matrix is studied. The orthogonal matrix's Cayley decomposition is extended into sub unitary matrix fields.
