On a class of quasi-Fredholm operators
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- Berkani, M. Integr equ oper theory (1999) 34: 244. doi:10.1007/BF01236475
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We study a class of bounded linear operators acting on a Banach spaceX called B-Fredholm operators. Among other things we characterize a B-Fredholm operator as the direct sum of a nilpotent operator and a Fredholm operator and we prove a spectral mapping theorem for B-Fredholm operators.