Geodesic
Semi-Fredholm Operators and Perturbations
Publications de l'Institut Mathématique, _N_S_61 (1997) no. 75, p. 73 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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It is well known that the set of semi-Fredholm operators is an open semigroup in the set of all bounded linear operators on Banach spaces [3]. Perturbations theorems for semi-Fredholm operators are of great interest (see e.g. [3], [4], [6], [9], [13], [14], [15] and [20]). The main results is a general perturbation theorem for semi-Fredholm operators. Then as a corollary we get some well known results of [6] and [7].
Classification : 47A10 47A53 
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     author = {Sne\v{z}ana \v{Z}ivkovi\'c},
     title = {Semi-Fredholm {Operators} and {Perturbations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {73 },
     year = {1997},
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     number = {75},
     zbl = {0889.47003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1997_N_S_61_75_a9/}
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Snežana Živković. Semi-Fredholm Operators and Perturbations. Publications de l'Institut Mathématique, _N_S_61 (1997) no. 75, p. 73 . http://geodesic.mathdoc.fr/item/PIM_1997_N_S_61_75_a9/