Results 11 to 20 of about 2,281,033 (352)

ON REPRESENTATION OF ONE CLASS OF SCHMIDT OPERATORS

open access: yesВестник КазНУ. Серия математика, механика, информатика, 2021
In this paper, unitary symmetrizers are considered. It is well known that using Newton operatoralgorithm, similar to the usual Newton algorithm, for extracting the square root, one can provethat for every Hermitian operator T 0, there exists a unique ...
I. Orazov, A. A. Shaldanbaeva
doaj   +1 more source

Some characterizations of surjective operators on banach lattices [PDF]

open access: yesJournal of Hyperstructures, 2018
The concepts of compact and weakly compact operators on Banach spaces are considered and investigated in several papers. In this paper, taking idea from this notations, we consider the concept surjective compact and weakly compact operators on Banach ...
Akbar Bahramnezhad, Kazem Haghnejad Azar
doaj   +1 more source

Compact covariance operators [PDF]

open access: yesProceedings of the American Mathematical Society, 1981
Let B be a real separable Banach space and R: i'->ia covariance operator. All representations of R in the form 2en ® e", (e", n > 1} c fi, are characterized. Necessary and sufficient conditions for R to be compact are ob- tained, including a generalization of Mercer's theorem. An application to character- istic functions is given. 1. Introduction.
Charles R. Baker, Ian W. McKeague
openaire   +2 more sources

An extension of compact operators by compact operators with no nontrivial multipliers [PDF]

open access: yesJournal of Noncommutative Geometry, 2018
We construct a noncommutative, separably represented, type I and approximately finite dimensional C^* -algebra such that its multiplier algebra is equal to its unitization. This algebra is an essential extension of the algebra \mathcal K(\ell_2(\mathfrak{c}))
Ghasemi, S. (Saeed), Koszmider, P.
openaire   +4 more sources

ASUPRA REGULARIZĂRII OPERATORILOR INTEGRALI SINGULARI. CRITERII NOETHERIENE

open access: yesActa et Commentationes: Ştiinţe Exacte şi ale Naturii, 2020
Lucrarea este consacrată studiului algebrei (închise) generată de operatorii integrali singulari cu coeficienți continui pe conturul Γ. Sunt stabilite condiţiile necesare şi suficiente în care operatorii din algebra A sunt noetherieni în spaţiul Lp (Γ ...
Vasile NEAGU
doaj   +1 more source

The relation between b-weakly compact operator and KB-operator

open access: yesTurkish Journal of Mathematics, 2019
Our aim is to solve the problem asked by Bahramnezhad and Azar in "KB-operators on Banach lattices and their relationships with Dunford-Pettis and order weakly compact operators".
Bahri Turan, B. Altın
semanticscholar   +1 more source

Nonlinear contraction and fuzzy compact operator in fuzzy Banach algebras

open access: yesFixed Point Theory, 2019
In this paper, at first, we consider the concept of fuzzy Banach algebras and fuzzy compact operators. Then we apply a fixed point theorem to solve the operator equation AxBx = x in the fuzzy Banach algebras under a nonlinear contraction.
R. Saadati
semanticscholar   +1 more source

A hyperbolic universal operator commuting with a compact operator [PDF]

open access: yes, 2019
A Hilbert space operator is called universal (in the sense of Rota) if every operator on the Hilbert space is similar to a multiple of the restriction of the universal operator to one of its invariant subspaces.
Cowen, Carl C.   +1 more
core   +1 more source

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