Results 21 to 30 of about 13,906 (254)

Linear combinations of composition operators on H ∞ $H^{\infty }$ spaces over the unit ball and polydisk

open access: yesJournal of Inequalities and Applications, 2021
In this paper, we characterize completely the compactness of linear combinations of composition operators acting on the space H ∞ ( B N ) $H^{\infty }(\mathbb{B}_{N})$ of bounded holomorphic functions over the unit ball B N $\mathbb{B}_{N}$ from two ...
Xingxing Yao
doaj   +1 more source

On component-wise dissimilarity measures and metric properties in pattern recognition [PDF]

open access: yesPeerJ Computer Science, 2022
In many real-world applications concerning pattern recognition techniques, it is of utmost importance the automatic learning of the most appropriate dissimilarity measure to be used in object comparison.
Enrico De Santis   +2 more
doaj   +2 more sources

Analytic Automorphisms and Transitivity of Analytic Mappings

open access: yesMathematics, 2020
In this paper, we investigate analytic automorphisms of complex topological vector spaces and their applications to linear and nonlinear transitive operators.
Zoriana Novosad, Andriy Zagorodnyuk
doaj   +1 more source

Linear relations in the Calkin algebra for composition operators [PDF]

open access: yesTransactions of the American Mathematical Society, 2007
We consider this and related questions: When is a finite linear combination of composition operators, acting on the Hardy space or the standard weighted Bergman spaces on the unit disk, a compact operator?
Kriete, Thomas, Moorhouse, Jennifer
openaire   +3 more sources

Spectra of Weighted Composition Operators with Quadratic Symbols

open access: yesConcrete Operators, 2022
Previously, spectra of certain weighted composition operators W ѱ, φ on H2 were determined under one of two hypotheses: either φ converges under iteration to the Denjoy-Wolff point uniformly on all of 𝔻 rather than simply on compact subsets, or φ is ...
Doctor Jessica   +4 more
doaj   +1 more source

On the Composition Ideals of Schatten Class Type Mappings

open access: yesJournal of Mathematics, 2016
We study the composition ideals of multilinear and polynomial mappings generated by Schatten classes. We give some coincidence theorems for Cohen strongly 2-summing multilinear operators and factorization results like that given by Lindenstrauss ...
Abdelaziz Belaada   +2 more
doaj   +1 more source

Components of linear-fractional composition operators

open access: yesJournal of Mathematical Analysis and Applications, 2003
Let \(\phi\) denote a holomorphic function on the open unit disc \(U\) in the complex plane with \(\phi(U) \subset U\). The composition operator \(C_{\phi}(f):=f \circ \phi\) is bounded in the Hardy space \(H^2\). Denote by \(\text{comp} (H^2)\) the collection of all composition operators on \(H^2\) endowed with the metric induced by the operator norm.
openaire   +1 more source

Renormalizability of the local composite operator Aμ2 in linear covariant gauges [PDF]

open access: yesPhysics Letters B, 2003
The local composite operator $A_μ^{2}$ is analysed within the algebraic renormalization in Yang-Mills theories in linear covariant gauges. We establish that it is multiplicatively renormalizable to all orders of perturbation theory. Its anomalous dimension is computed to two-loops in the MSbar scheme.
Dudal, David   +6 more
openaire   +5 more sources

Uncertainty Estimation for Machine Learning Models in Multiphase Flow Applications

open access: yesInformatics, 2021
In oil and gas production, it is essential to monitor some performance indicators that are related to the composition of the extracted mixture, such as the liquid and gas content of the flow.
Luca Frau   +3 more
doaj   +1 more source

Composition Operators and Multiplication Operators on Weighted Spaces of Analytic Functions

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2007
Let V be an arbitrary system of weights on an open connected subset G of ℂN(N≥1) and let B(E) be the Banach algebra of all bounded linear operators on a Banach space E.
J. S. Manhas
doaj   +1 more source

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