[交流] 矩阵左乘或右乘一个对角矩阵之后特征值的变化

6楼: Originally posted by Halmos at 2013-07-30 00:09:39
The matrices $AB$ and $BA$ are similar provided either $A$ or $B$ is invertible.

If both $A$ and $B$ are singular (and square), a limiting argument involving $A +\epsilon I$
is useful. In this c ...

2楼: Originally posted by hwzxaww at 2013-07-29 20:10:28
特征值不变，特征向量改变。