Results 71 to 80 of about 455 (108)

A simulation algorithm for a single server retrial queuing system with batch arrivals

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2015
Many systems of real word are modeled by retrial queuing system with batch arrivals. Analytical formulas for this class of systems are complicated and address only particular cases.
Florea Ion, Nǎnǎu Corina-Ştefania
doaj   +1 more source

Counterexamples Related to Commutators of Unbounded Operators [PDF]

arXiv, 2018
The present paper is exclusively devoted to counterexamples about commutators and self commutators of unbounded operators on a Hilbert space. As a bonus, we provide a simpler counterexample than McIntosh's famous example obtained some while ago.
arxiv  

NONLINEAR JORDAN HIGHER DERIVATIONS ON TRIANGULAR RINGS

, 2014
Let T be a triangular ring. We say that a family of maps δ = {δn, δn : T → T , n ∈ N} is a Jordan higher derivable map (without assumption of additivity or continuity) if δn(AB + BA) = ∑ i+j=n [δi(A)δj(B) + δj(B)δi(A)] for all A,B ∈ T . In this paper, we
Chunhui Xue, Runling An, Huiyuan Zhang
semanticscholar   +1 more source

Spectral equality for $C_0$ semigroups [PDF]

arXiv, 2016
In this paper, we give conditions for which the $C_0$ semigroups satisfies spectral equality for semiregular, essentially semiregular and semi-Fredholm spectrum. Also, we establish the spectral inclusion for B-Fredholm spectrum of a $C_0$ semigroups.
arxiv  

Commuting of block dual Toeplitz operators

, 2014
In this paper, we characterize the commuting (semi-commuting) and the essentially commuting (semi-commuting) of block dual Toeplitz operators. Mathematics subject classification (2010): 47B35, 47B47.
Bo Zhang, Yufeng Lu
semanticscholar   +1 more source

Remarks on Jordan derivations over matrix algebras [PDF]

arXiv, 2018
Let C be a commutative ring with unity. In this article, we show that every Jordan derivation over an upper triangular matrix algebra T_n(C) is an inner derivation. Further, we extend the result for Jordan derivation on full matrix algebra M_n(C).
arxiv  

On local properties of Hochschild cohomology of a C$^*$- algebra [PDF]

, 2007
Let $A$ be a C$^*$-algebra, and let $X$ be a Banach $A$-bimodule. B. E. Johnson showed that local derivations from $A$ into $X$ are derivations. We extend this concept of locality to the higher cohomology of a $C^*$-algebra %for $n$-cocycles from $A^{(n)}$ into $X$ and show that, for every $n\in \N$, bounded local $n$-cocycles from $A^{(n)}$ into $X ...
arxiv   +1 more source

Nilpotent perturbations of m-isometric and m-symmetric tensor products of commuting d-tuples of operators

Demonstratio Mathematica
If T1{{\mathbb{T}}}_{1} and T2{{\mathbb{T}}}_{2} are commuting dd-tuples of Hilbert space operators in B(ℋ)dB{\left({\mathcal{ {\mathcal H} }})}^{d} such that (T1*⊗I+I⊗T2*,T1⊗I+I⊗T2)\left({{\mathbb{T}}}_{1}^{* }\otimes I+I\otimes {{\mathbb{T}}}_{2}^{* },{
Duggal Bhagwati Prashad, Kim In Hyoun
doaj   +1 more source

Upper triangular operator matrices, asymptotic intertwining and Browder, Weyl theorems

, 2013
Given a Banach space X, let MC∈B(X⊕X) denote the upper triangular operator matrix MC=(AC0B), and let δAB∈B(B(X)) denote the generalized derivation δAB(X)=AX−XB.
B. Duggal, I. Jeon, I. Kim
semanticscholar   +1 more source

Bloom-type two-weight inequalities for commutators of maximal functions

Analysis and Geometry in Metric Spaces
We study Bloom-type two-weight inequalities for commutators of the Hardy-Littlewood maximal function and sharp maximal function. Some necessary and sufficient conditions are given to characterize the two-weight inequalities for such commutators.
Zhang Pu, Fan Di
doaj   +1 more source