Results 71 to 80 of about 1,164 (138)
Philosophy of Natural Numbers [PDF]
arXiv, 2020 We discuss an extension of classical combinatorics theory to the case of spatially distributed objects.
arxiv
SOME RESULTS ON OPERATORS CONSISTENT IN INVERTIBILITY [PDF]
, 2018 In this paper, we investigate the conditions under which some classes of operators in a complex Hilbert space H are said to be consistent in invertibility.
Stephen, Luketero, Wabuya, Kikete
core +1 more source
, 2012 We define four 3x3 commuting contractions which do not dilate to commuting isometries. However they do satisfy the scalar von Neumann inequality. These matrices are all nilpotent of order 2.
Choi, Man Duen, Davidson, Kenneth R.
core +1 more source
Selfadjoint operators, normal operators, and characterizations
Operators and Matrices, 2019 Let B(H) be the C∗ -algebra of all bounded linear operators acting on a complex separable Hilbert space H . We shall show that: 1. The class of all selfadjoint operators in B(H) multiplied by scalars is characterized by ∀X ∈ B(H), ∥∥S2X +XS2∥∥ 2‖SXS ...
A. Seddik
semanticscholar +1 more source
On Quasi-Normality of Two-Sided Multiplication [PDF]
, 2009 2000 Mathematics Subject Classification: 47B47, 47B10, 47A30.In this note, we characterize quasi-normality of two-sided multiplication, restricted to a norm ideal and we extend this result, to an important class which contains all quasi-normal operators.
Amouch, M.
core
Positivity of Partitioned Hermitian Matrices with Unitarily Invariant Norms
, 2014 We give a short proof of a recent result of Drury on the positivity of a $3\times 3$ matrix of the form $(\|R_i^*R_j\|_{\rm tr})_{1 \le i, j \le 3}$ for any rectangular complex (or real) matrices $R_1, R_2, R_3$ so that the multiplication $R_i^*R_j$ is ...
Li, Chi-Kwong, Zhang, Fuzhen
core +1 more source
Fourier cosine-Laplace generalized convolution inequalities and applications
Mathematical Inequalities & Applications, 2019 We introduce several weighted Lp(R+) -norm inequalities and integral transform related to the generalized convolution with a weight function for the Fourier cosine and Laplace transforms.
N. X. Thao, Le Xuan Huy
semanticscholar +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
Remarks on an operator Wielandt inequality
, 2015 Let $A$ be a positive operator on a Hilbert space $\mathcal{H}$ with $00.$$ We consider several upper bounds for $\frac{1}{2}|\Gamma+\Gamma^{*}|$.
Zhang, Pingping
core +2 more sources
Additive refinements and reverses of Young's operator inequality with applications
Journal of Mathematical Inequalities, 2019 In this paper we obtain some new additive refinements and reverses of Young’s operator inequality. Applications related to the Hölder-McCarthy inequality for positive operators and for trace class operators on Hilbert spaces are given as well ...
S. Dragomir
semanticscholar +1 more source