Results 21 to 30 of about 1,317,588 (284)

Extended Weyl-Type Theorems for Direct Sums

open access: yesDemonstratio Mathematica, 2014
In this paper, we study the stability of extended Weyl and Browdertype theorems for orthogonal direct sum S⊕T, where S and T are bounded linear operators acting on Banach space.
Berkani M., Kachad M., Zariouh H.
doaj   +1 more source

Sequence spaces M ( ϕ ) $M(\phi)$ and N ( ϕ ) $N(\phi)$ with application in clustering

open access: yesJournal of Inequalities and Applications, 2017
Distance measures play a central role in evolving the clustering technique. Due to the rich mathematical background and natural implementation of l p $l_{p}$ distance measures, researchers were motivated to use them in almost every clustering process ...
Mohd Shoaib Khan   +3 more
doaj   +1 more source

Epistemicism and modality [PDF]

open access: yes, 2016
What kind of semantics should someone who accepts the epistemicist theory of vagueness defended in Timothy Williamson’s Vagueness (1994) give a definiteness operator?
Yli-Vakkuri, Juhani
core   +1 more source

A Theory of Closure Operators [PDF]

open access: yes, 2008
We explore how fixed-point operators can be designed to interact and be composed to form autonomic control mechanisms. We depart from the idea that an operator is idempotent only for the states that it assures, and define a more general concept in which acceptable states are a superset of assurable states.
Alva L. Couch, Marc Chiarini
openaire   +1 more source

Operational theories as structural realism

open access: yesStudies in History and Philosophy of Science, 2022
We undertake a reconstruction of the epistemic significance of research on operational theories in quantum foundations. We suggest that the space of operational theories is analogous to the space of possible worlds employed in the possible world semantics for modal logic, so research of this sort can be understood as probing modal structure.
openaire   +4 more sources

A FIELD THEORY FOR THE READ OPERATOR [PDF]

open access: yesInternational Journal of Modern Physics B, 1996
We introduce a new field theory for studying quantum Hall systems. The quantum field is a modified version of the bosonic operator introduced by Read. In contrast to Read's original work we do not work in the lowest Landau level alone, and this leads to a much simpler formalism.
Rajaraman, R., Sondhi, S. L.
openaire   +2 more sources

Generalization of Darbo-type theorem and application on existence of implicit fractional integral equations in tempered sequence spaces

open access: yesAlexandria Engineering Journal, 2022
The aim of this work is to give some fixed point results based on the technique of measure of noncompactness which extend the classical Darbo’s theorem.
Anupam Das   +3 more
doaj   +1 more source

The Wess-Zumino-Witten term in non-commutative two-dimensional fermion models [PDF]

open access: yes, 2000
We study the effective action associated to the Dirac operator in two dimensional non-commutative Field Theory. Starting from the axial anomaly, we compute the determinant of the Dirac operator and we find that even in the U(1) theory, a Wess-Zumino ...
Moreno, E. F., Schaposnik, F. A.
core   +2 more sources

Statistical weighted A-summability with application to Korovkin’s type approximation theorem

open access: yesJournal of Inequalities and Applications, 2016
We introduce the notion of statistical weighted A-summability of a sequence and establish its relation with weighted A-statistical convergence. We also define weighted regular matrix and obtain necessary and sufficient conditions for the matrix A to be ...
Syed Abdul Mohiuddine
doaj   +1 more source

On the order of approximation by modified summation-integral-type operators based on two parameters

open access: yesDemonstratio Mathematica, 2023
In this article, we the study generalized family of positive linear operators based on two parameters, which are a broad family of many well-known linear positive operators, e.g., Baskakov-Durrmeyer, Baskakov-Szász, Szász-Beta, Lupaş-Beta, Lupaş-Szász ...
Mohiuddine Syed Abdul   +2 more
doaj   +1 more source

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