摘要
本文首先指出文献［１］中的二个命题是错的，接着探讨了产生这错误的原因，进而给出并证明了相应的二个正确命题．
It is pointed out that two propositions in are erroneous. We study the cause led to the errors. And further,we give two correct corresponding propositions and prove them.
基金
浙江省自然科学基金
关键词
伪正交变换
特征值
直和
非退化
矩阵
pseudo orthogonal transformation
characteristic value
direct sum
non degenerate
