Results 61 to 70 of about 91 (89)

On Quasi-similarity of a product of Quasi-similar operators in Hilbert Spaces.

, 2015
In this paper we investigate the conditions under which two operators A and B are quasi-similar implies AB and BA are also quasi-similar. It is herein shown that if A and B satisfy the Putnam-Fuglede property and are quasi-similar with the intertwining ...
S.W., Luketero, D.W., Kikete, J.K., Mile, J.M, Khalagai   +3 more
core  

On Quasi-Similarity and Putnam- Fuglede Property of Operators In Hilbert Spaces

, 2014
The problem of finding conditions under which two given operators say A and B have equal spectra has been considered by several authors. In this paper we show that quasi-similar operators  and  which satisfy the Putnam- Fuglede property have equal ...
LUKETERO, S.W., RUGIRI, P.G., KHALAGAI, J.M.   +2 more
core  

About instability in an elastic Cosserat body with pores

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica
This article is centered on the study of the isotropic, porous Cosserat elastic media, realized by means of a parallel with the media of the same type, but anisotropic, by following the rewriting in a new form of the equations that govern this theory ...
Codarcea-Munteanu L., Marin M., Abouelregal A. E.   +2 more
doaj   +1 more source

ON EQUALITY OF SPECTRA AND ESSENTIAL SPECRA OF OPERATORS IN HILBERT SPACES

, 2015
It is a well known fact in operator theory that for any operator A, the essential spectrum of A is contained in the spectrum of A.  The task of finding conditions under which the two are equal has been the subject matter in a number of several research ...
LUKETERO, S.W., RUGIRI, P.G., KHALAGAI, J.M.   +2 more
core  

ON QUASI-INVERTIBILITY AND QUASI-SIMILARITY OF OPERATORS IN HILBERT SPACES.

, 2015
It is a well known fact in operator Theory that if A and B are operators with at least one of them invertible then AB and BA are similar operators.  In this paper we prove an analogous result about quasi-invertible operators A and B. We thus show that if
LUKETERO, S.W., RUGIRI, P.G., KHALAGAI, J.M.   +2 more
core  

On the metrizability of suprametric space

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica
The question of metrizability of suprametric space is answered positively. The observed metric coincides with a suprametric in a way that convergence and continuity are preserved between suprametric space and associated metric space along with the ...
Karapınar Erdal, Cvetković Marija
doaj   +1 more source

Subnormality in the Quantum Harmonic Oscillator

, 2007
. This is an invitation to enjoy watching how unbounded subnormality, a rather recent development, gets involved in solving the commutation relation of the quantum harmonic oscillator. 1991 Mathematics Subject Classification.
Franciszek Hugon, S \gamma Ss, Franciszek Hugon Szafraniec   +2 more
core  

Weak convergence theorems for inertial Krasnoselskii-Mann iterations in the class of enriched nonexpansive operators in Hilbert spaces

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica
In this paper, we present some results about the aproximation of fixed points of nonexpansive and enriched nonexpansive operators. In order to approximate the fixed points of enriched nonexpansive mappings, we use the Krasnoselskii-Mann iteration for ...
Socaciu Liviu-Ignat
doaj   +1 more source

Riesz potential and its commutators on Orlicz spaces. [PDF]

J Inequal Appl, 2017
Guliyev VS, Deringoz F, Hasanov SG.
europepmc   +1 more source

Properties of derivations on some convolution algebras

Open Mathematics, 2014
Pedersen Thomas
doaj   +1 more source