Operational quantities derived from the norm and generalized Fredholm theory.

Título inglés	Operational quantities derived from the norm and generalized Fredholm theory.
Título español	Cantidades operacionales derivadas de la norma y teoría de Fredholm generalizada.
Autor/es	González, Manuel ; Martinón, Antonio
Organización	Dep. Mat. Univ. Cantabria, Santander, España;Dep. Anál. Mat. Univ. La Laguna, La Laguna (Tenerife), España
Revista	0213-8743
Publicación	1991, 6 (2-3): 132-134, 2 Ref.
Tipo de documento	articulo
Idioma	Inglés
Resumen inglés	Several operational quantities, defined in terms of the norm and the class of finite dimensional Banach spaces, have been used to characterize the classes of upper and lower semi-Fredholm operators, strictly singular and strictly cosingular operators, and to derive some perturbation results. In this paper we shall introduce and study some operational quantities derived from the norm and associated to a space ideal. By means of these quantities we construct a generalized Fredholm theory in which the space ideal plays the role of the finite dimensional spaces, and we extend to this situation many of the results of the classical Fredholm theory.
Clasificación UNESCO	120201
Palabras clave español	Operadores de Fredholm ; Operadores singulares ; Teoría de perturbación ; Espacios de Banach
Código MathReviews	MR1185359
Código Z-Math	Zbl 1059.47500
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