研究了 Hilbert 空间$H\oplus K$上的$2\times 2$阶上三角算子矩阵\mc 当$A,B$给定,$C$为任意有界线性算子时,对$M_C$的点谱、剩余谱、连续谱的扰动分别给出了 描述.

In this paper, we study the $2\times 2$ upper triangular operator matrices such as . Given $A$ and $B$, the perturbation's discriptions for point spectrum, residual spectrum and continuous spectrum of $M_C$ are presented, respectively, where $C$ is an arbitrary bounded linear operator.