Results 91 to 100 of about 1,609,497 (228)

On th-Order Slant Weighted Toeplitz Operator

The Scientific World Journal, 2013
Let be a sequence of positive numbers with , when and when . A th-order slant weighted Toeplitz operator on is given by , where is the multiplication on and is an operator on given by , being the orthonormal basis for . In this paper, we define
S. C. Arora, Ritu Kathuria
doaj   +1 more source

Rings with multiple-valued operations

Duke Mathematical Journal, 1941
Not ...
openaire   +2 more sources

Cyclic vectors for multiplication operators.

Michigan Mathematical Journal, 1988
If \(E\) is a complex topological vector space and \(T\) a continuous linear transformation on \(E\), a vector \(x\in E\) is a cyclic vector for \(T\) if \(\{p(T)x: p\) a polynomial\(\}\) is dense in \(E\). If \(\mu\) is a compactly supported Borel measure on \(\mathbb C\), let \(X\) be the closed unit ball of \(L^{\infty}(\mu)\) and let \(X_ p\) be ...
openaire   +3 more sources

Spectral decomposition of self-adjoint operators in Pontryagin and Krein spaces

Современная математика: Фундаментальные направления
We consider a self-adjoint operator acting in a Krein space and possessing an invariant subspace that is maximal nonnegative and decomposes into a direct sum of a uniformly positive (i.e., equivalent to a Hilbert space with respect to the inner ...
V. A. Strauss
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Multiplication operators [PDF]

Pacific Journal of Mathematics, 1961
openaire   +2 more sources

On the Universal Interpolating Sequences on H2 (β)

Journal of Mathematical Extension, 2007
In this paper we investigate the relation between universal interpolating sequence and the approximate point spectrum of the adjoint multiplication operator acting on the Hilbert spaces of formal power series.
B. Yousef, L. Bagheri, T. Rastegar
doaj  

Early warning signs for SPDEs with continuous spectrum

European Journal of Applied Mathematics
In this work, we study early warning signs for stochastic partial differential equations (SPDEs), where the linearisation around a steady state is characterised by continuous spectrum. The studied warning sign takes the form of qualitative changes in the
Paolo Bernuzzi, Antonia Freya Susanne Düx, Christian Kuehn   +2 more
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The essential norm of bounded diagonal infinite matrices acting on Banach sequence spaces

Demonstratio Mathematica
We calculate the essential norm of bounded diagonal infinite matrices acting on Köthe sequence spaces. As a consequence of our result, we obtain a recent criteria for the compactness of multiplication operator acting on Köthe sequence spaces.
Fernández Julio C. Ramos, Rivera-Sarmiento María A., Salas-Brown Margot   +2 more
doaj   +1 more source

Weighted composition operators on bicomplex Lorentz spaces with their characterization and properties

Demonstratio Mathematica
This article presents a characterization of non-singular measurable transformation, denoted as TT, mapping from Ω\Omega to itself, along with bicomplex-valued BC{\mathbb{BC}}-measurable function uu defined on Ω\Omega , which induces a weighted ...
Eryılmaz İlker
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The Multiplication Operator in Sobolev Spaces with Respect to Measures

Journal of Approximation Theory, 2001
J. Rodríguez
semanticscholar   +1 more source