A generalization of a classic theorem in the perturbation theory for linear operators
Let X and Y be Banach spaces, and let T: X --> Y be a bounded linear operator with closed range. In this paper we extend a classic perturbation result from the invertible case to the general case for the consistent operator equation Tx = y. (C) 1999 Academic Press.
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS
(2012). A generalization of a classic theorem in the perturbation theory for linear operators. JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, 239(1), 118-123.
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