Error Bounds for the Perturbation of the Drazin Inverse of Closed Operators with Equal Spectral Projections
نویسندگان
چکیده
We study perturbations of the Drazin inverse of a closed linear operator A for the case when the perturbed operator has the same spectral projection as A. This theory subsumes results recently obtained by Wei and Wang, Rakočević and Wei, and Castro and Koliha. We give explicit error estimates for the perturbation of Drazin inverse, and error estimates involving higher powers of the operators.
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