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The gap between subspaces and perturbation of non-semi-Fredholm operators

Published online by Cambridge University Press:  17 April 2009

Jose A. Alvarez ,
Teresa Alvarez  and
Manuel Gonzalez
Jose A. Alvarez
Affiliation:
Departamento de MatematicasUniversidad de CantabriaFacultad de Ciencias 39071 Santander, Spain
Teresa Alvarez
Affiliation:
Departamento de MatematicasUniversidad de CantabriaFacultad de Ciencias 39071 Santander, Spain
Manuel Gonzalez
Affiliation:
Departamento de MatematicasUniversidad de OviedoFacultad de Ciencias 33071 Oviedo, Spain
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Abstract

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We study a concept of stability under the gap of isomorphic properties of Banach spaces and apply it to obtain some results of stability under compact or small norm perturbation for non-semi-Fredholm operators with closed range.

Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 45 , Issue 3 , June 1992 , pp. 369 - 376
Copyright
Copyright © Australian Mathematical Society 1992

References

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