Results 11 to 20 of about 519,001 (206)

Some Remarks on Perturbation Classes of Semi-Fredholm and Fredholm Operators [PDF]

International Journal of Mathematics and Mathematical Sciences, 2007
We show the existence of Banach spaces X, Y such that the set of strictly singular operators 𝒮(X,Y) (resp., the set of strictly cosingular operators 𝒞𝒮(X,Y)) would be strictly included in ℱ+(X,Y) (resp., ℱ−(X,Y)) for the nonempty class of closed densely ...
Abdelkader Dehici, Khaled Saoudi
doaj   +4 more sources

Fredholm-type operators and index

Journal of Mathematical Analysis and Applications
arXiv admin note: text overlap with arXiv:2401 ...
Mohammed Berkani
exaly   +4 more sources

Ultrametric Fredholm operators and approximate pseudospectrum [PDF]

Arab Journal of Mathematical Sciences
PurposeThe paper deals with ultrametric bounded Fredholm operators and approximate pseudospectra of closed and densely defined (resp. bounded) linear operators on ultrametric Banach spaces.Design/methodology/approachThe author used the notions of ...
Jawad Ettayb
doaj   +3 more sources

Fredholm property of regular hypoelliptic operators on the scales of multianisotropic spaces [PDF]

ITM Web of Conferences, 2022
This paper studies the Fredholm properties for a class of regular hypoelliptic operators. We establish necessary and sufficient conditions for a priori estimates for differential operators acting in multianisotropic Sobolev spaces in Rn.
Tumanyan Ani
doaj   +2 more sources

$C_{0}$-Fredholm operators. IV [PDF]

Publicacions Matemàtiques, 1983
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Bercovici, H., H. Bercovici
openaire   +8 more sources

Some special characterisations of Fredholm operators in Banach space [PDF]

Bibechana, 2014
A bounded linear operator which has a finite index and which is defined on a Banach space is often referred to in the literature as a Fredholm operator. Fredholm operators are important for a variety of reasons, one being the role that their index plays
Mahendra Shahi
doaj   +4 more sources

The generalized Fredholm operators [PDF]

Transactions of the American Mathematical Society, 1976
Let X, Y be Banach spaces over either the real field or the complex field. A continuous linear operator will be called a generalized Fredholm operator if
Kung Wei Yang
openaire   +3 more sources

Fredholm composition operators [PDF]

Proceedings of the American Mathematical Society, 1980
In this paper a necessary and sufficient condition for a composition operator C T
Ashok Kumar
openaire   +2 more sources

A note on the decomposition of Fredholm operators

Demonstratio Mathematica, 2008
AbstractWe generalize a result of F. Szigeti concerning the decomposition of Fredholm operators on Banach spaces.
Schmoeger, Christoph
core   +3 more sources

On classes of Fredholm type operators

Filomat
Given an idempotent p in a Banach algebra and following the study in [6] of p-invertibility, we consider here left p-invertibility, right p-invertibility and p-invertibility in the Calkin Algebra C(X), where X is a Banach space. Then we define and study left and right generalized Drazin invertibility and we characterize left and right Drazin invertible
Hamdan, Alaa, Berkani, Mohammed
openaire   +3 more sources