对于斜对角元至少有一个可逆的算子矩阵,刻画了其谱,1、2、3、4-类点谱及1、2-类剩余谱,并举例验证了结果的合理性.
For the operator matrices with an invertible diagonal element,the descriptions of spectra,four kinds of point spectra,and two kinds of residual spectra are given.Moreover,some examples are presented to illustrate our results.