主要研究了Hilbert空间上两个Drazin可逆算子和的Drazin可逆性.同时,对上三角算子矩阵的Drazin可逆性也给出了详细的讨论.
We study the Drazin invertibility of the sum of two Drazin invertible linear operators on Hilbert spaces. Moreover, the Drazin invertibility of the upper triangular operator matrix is also discussed.