Results 21 to 30 of about 2,809,960 (74)

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

, 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   +1 more source

Generalized D-Symmetric Operators I [PDF]

, 2008
2000 Mathematics Subject Classification: Primary: 47B47, 47B10; secondary 47A30.Let H be an infinite-dimensional complex Hilbert space and let A, B ∈ L(H), where L(H) is the algebra of operators on H into itself.
Ech-chad, M., Bouali, S.
core  

Quadratic refinements of matrix means [PDF]

, 2017
The main target of this article is to present refinements of the matrix arithmetic-geometric mean inequality. The main difference between these refinements and the ones in the literature is the quadratic behavior of the refining terms.
SABABHEH, Mohammad
core   +1 more source

Some means inequalities for positive operators in Hilbert spaces [PDF]

, 2017
In this paper, we obtain two refinements of the ordering relations among Heinz means with different parameters via the Taylor series of some hyperbolic functions and by the way, we derive new generalizations of Heinz operator inequalities.
Jin Liang, Shi, Guanghua, Liang, Jin, Guanghua Shi   +3 more
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On the Range and the Kernel of Derivations [PDF]

, 2006
2000 Mathematics Subject Classification: Primary 47B47, 47B10; Secondary 47A30.Let H be a separable infinite dimensional complex Hilbert space and let L(H) denote the algebra of all bounded linear operators on H into itself.
Bouali, Said, Bouhafsi, Youssef
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

AN INTERNAL CHARACTERIZATION OF COMPLETE POSITIVITY FOR ELEMENTARY OPERATORS

, 2002
Complete positivity of ‘atomically extensible’ bounded linear operators between $C^*$-algebras is characterized in terms of positivity of a bilinear form on certain finite-rank operators.
Richard M. Timoney
core   +1 more source

Contractible Kothe Co-Echelon Algebras

, 2020
In this note we investigate contractibility properties in the class of the socalled DF-algebras. We also give a complete characterization of contractible  Kothe co-echelon algebras.
Piszczek, Krzysztof
core  

Mired in the shadows: quiet students in secondary schools [PDF]

, 2011
Quiet students are a feature of the organisation of secondary schools. Using qualitative methods and Deleuzean conceptualisations of modern subjectivity, this paper explores the ways that quiet students negotiate the terrain of their school.
James Bell, Thompson, Greg, Thompson, G., Bell, James, Greg Thompson, Bell, J.   +5 more
core   +1 more source

Operator norms of Gauß-Weierstraß operators and their left quasi interpolants

, 2019
The paper deals with the Gauß–Weierstraß operators Wn and their left quasi interpolants W [r]. The quasi interpolants were defined by Paul Sablonni`ere in 2014.
ABEL, Ulrich
core   +1 more source