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作者单位:Kaifan Yang (1) Hongke Du (2)
1. School of Mathematics and Computer Science, Shaanxi University of Technology, Hanzhong, 723001, China 2. College of Mathematics and Information Science, Shaanxi Normal University, Xi鈥檃n, 710062, China
ISSN:1673-3576
文摘
The necessary and sufficient conditions for the small norm perturbation of a Drazin invertible operator to be still Drazin invertible and the sufficient conditions for the finite rank perturbation of a Drazin invertible operator to be still Drazin invertible are established.