Results 11 to 20 of about 127 (43)
Estimates for Marcinkiewicz commutators with Lipschitz functions under nondoubling measures [PDF]
Journal of Inequalities and Applications, 2013 Under the assumption that μ is a nondoubling measure on Rd satisfying the growth condition, the author proves that the commutator Mb generated by the Marcinkiewicz integral operator and the Lipschitz function is bounded from the Hardy space Hfin1,∞,0(μ ...
Liang Li
semanticscholar +6 more sources
On operators satisfying an inequality [PDF]
Journal of Inequalities and Applications, 2012 An operator T is said to be k-quasi-∗-class A if T∗k(|T2|−|T∗|2)Tk≥0, where k is a natural number. Let dA,B∈B(B(H)) denote either the generalized derivation δA,B=LA−RB or the elementary operator ΔA,B=LARB−I, where LA and RB are the left and right ...
S. Mécheri
semanticscholar +4 more sources
Multilinear commutators for fractional integrals in non-homogeneous spaces [PDF]
, 2004 Under the assumption that µ is a non-doubling measure on Rd, the authors obtain the (Lp, Lq)-boundedness and the weak type endpoint estimate for the multilinear commutators generated by fractional integrals with RBMO(µ) functions of Tolsa or with Oscexp ...
Dachung, Yang, Guoen, Hu, Yan, Meng
core +4 more sources
Analysis of the energy decay of a viscoelasticity type equation
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2016 In this paper, we study the evolution of the energy density of a sequence of solutions of a problem related to a viscoelasticity model where the viscosity term is a pseudo-differential operator of order 2α with α ∈ (0, 1).
Atallah-Baraket Amel, Trabelsi Maryem
doaj +1 more source
A posteriori analysis of the spectral element discretization of heat equation
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2014 In this paper, we present a posteriori analysis of the discretization of the heat equation by spectral element method. We apply Euler’s implicit scheme in time and spectral method in space.
Chorfi Nejmeddine +2 more
doaj +1 more source
On some classical trace inequalities and a new Hilbert-Schmidt norm inequality
, 2018 Let A be a positive semidefinite matrix and B be a Hermitian matrix. Using some classical trace inequalities, we prove, among other inequalities, that ∥ ∥AsB+BA1−s ∥ ∥ 2 ∥ ∥AtB+BA1−t ∥ ∥ 2 for 2 s t 1 . We conjecture that this inequality is also true for
M. Hayajneh, Saja Hayajneh, F. Kittaneh
semanticscholar +1 more source
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
New conditions for positivity of operators in non-unital C*-algebras
, 2015 In this note, we present new conditions for positivity of operators in non-unital C*algebras.
R. Obogi, N. B. Okelo, O. Ongati
semanticscholar +2 more sources
Scalar approximants of quadratic operators with applications
, 2018 Among other results, we find the best scalar approximant of a quadratic operator with respect to the numerical radius and the operator norm. We use these results to give estimates for the numerical radii of products and commutators of quadratic operators.
A. Abu-Omar, P. Wu
semanticscholar +1 more source
Operator inequalities on Hilbert C^*-modules via the Cauchy-Schwarz inequality
, 2014 By means of a new Cauchy-Schwarz inequality in the framework of a semi-inner product C ∗ -module over a unital C∗ -algebra, we discuss some operator inequalities on a Hilbert C ∗ module, for example, Kantorovich inequaity, Polya-Szego inequality, the ...
J. Fujii, M. Fujii, Y. Seo
semanticscholar +1 more source