Gap and perturbation of non-semi-Fredholm operators.
Extracta Mathematicae, Tome 4 (1989) no. 3, p. 139.

Voir la notice de l'article dans European Digital Mathematics Library

Classification : 47A05, 47A53, 47A55
Mots-clés : Teoría de perturbación, Operadores, perturbation of subspaces, stability property, closed operators with closed range, -stable and non--stable classes, -costable classes 
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     author = {Jos\'e A. Alvarez and Teresa Alvarez and Manuel Gonz\'alez},
     title = {Gap and perturbation of {non-semi-Fredholm} operators.},
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José A. Alvarez; Teresa Alvarez; Manuel González. Gap and perturbation of non-semi-Fredholm operators.. Extracta Mathematicae, Tome 4 (1989) no. 3, p. 139. https://geodesic-test.mathdoc.fr/item/EXMATH_1989__4_3_38327/