PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.) Vol. 61(75), pp. 7389 (1997) 

SemiFredholm operators and perturbationsSnezana Zivkovi\'cFilozofski fakultet, Nis, YugoslaviaAbstract: It is well known that the set of semiFredholm operators is an open semigroup in the set of all bounded linear operators on Banach spaces [3]. Perturbations theorems for semiFredholm 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 semiFredholm operators. Then as a corollary we get some well known results of [6] and [7]. Classification (MSC2000): 47A10; 47A53 Full text of the article:
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