Results 11 to 20 of about 2,962,628 (305)
M-quasi-hyponormal composition operators
International Journal of Mathematics and Mathematical Sciences, 1987 A necessary and sufficient condition is obtained for M-quasi-hyponormal composition operators. It has also been proved that the class of M-quasi-hyponormal composition operators coincides with the class of M-paranormal composition operators. Existence of
Pushpa R. Suri, N. Singh
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Antinormal Weighted Composition Operators [PDF]
Abstract and Applied Analysis, 2016 Let l2=L2N,μ, where N is set of all positive integers and μ is the counting measure whose σ-algebra is the power set of N. In this paper, we obtain necessary and sufficient conditions for a weighted composition operator to be antinormal on the Hilbert ...
Dilip Kumar, Harish Chandra
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Weighted composition operators between two different weighted sequence spaces
Advances in Pure and Applied Mathematics, 2022 We give simple criteria which characterize the symbols u, ϕ defining continuous and compact weighted composition operators Wu,ϕ acting between two different weighted sequence spaces.
Carlos Carpintero +2 more
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A model for composable composition operators [PDF]
Proceedings of the 9th International Conference on Aspect-Oriented Software Development, 2010 A considerable amount of research, especially within the OO and AOSD communities, has focused on understanding the potential and limitations of various composition techniques. This has led to a large amount of proposals for alternative composition techniques, including many variations of message dispatch, inheritance, and aspect mechanisms.
Havinga, Wilke +2 more
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Complex symmetric weighted composition operators on the Hardy space [PDF]
, 2020 summary:This paper identifies a class of complex symmetric weighted composition operators on $H^2(\mathbb {D})$ that includes both the unitary and the Hermitian weighted composition operators, as well as a class of normal weighted composition operators ...
Zhou, Ze-Hua, Jiang, Cao, Han, Shi-An
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Universal Sequences of Composition Operators
The Journal of Geometric Analysis, 2023 Let $G$ and $Ω$ be two planar domains. We give necessary and sufficient conditions on a sequence $(ϕ_n)$ of eventually injective holomorphic mappings from $G$ to $Ω$ for the existence of a function $f\in H(Ω)$ whose orbit under the composition by $(ϕ_n)$ is dense in $H(G)$. This extends a result of the same nature obtained by Grosse-Erdmann and Mortini
Charpentier, S., Mouze, Augustin
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Composition Operators and Endomorphisms [PDF]
Complex Analysis and Operator Theory, 2010 If $b$ is an inner function, then composition with $b$ induces an endomorphism, $β$, of $L^\infty(\mathbb{T})$ that leaves $H^\infty(\mathbb{T})$ invariant. We investigate the structure of the endomorphisms of $B(L^2(\mathbb{T}))$ and $B(H^2(\mathbb{T}))$ that implement $β$ through the representations of $L^\infty(\mathbb{T})$ and $H^\infty(\mathbb{T})$
Courtney, Dennis +2 more
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Cyclic behaviour of Volterra composition operators [PDF]
, 2011 We determine the cyclic behaviour of Volterra composition operators, which are defined as $(V_\phif)(x) =\int_0^{\phi(x)}f(t) dt$, $f ? L^p[0, 1]$, 1\leq p <\infty$,where $?$ is a measurable self-map of [0, 1].
Stanislav Shkarin +5 more
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Composite operators in QCD [PDF]
Nuclear Physics B, 1992 We give a formula for the derivatives of a correlation function of composite operators with respect to the parameters (i.e., the strong fine structure constant and the quark mass) of QCD in four-dimensional euclidean space. The formula is given as spatial integration of the operator conjugate to a parameter. The operator product of a composite operator
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Differences of weighted composition operators from Hardy space to weighted-type spaces on the unit ball [PDF]
, 2010 summary:In this paper, we limit our analysis to the difference of the weighted composition operators acting from the Hardy space to weighted-type space in the unit ball of $\mathbb {C}^N$, and give some necessary and sufficient conditions for their ...
Liang, Yu-Xia +5 more
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