Results 31 to 40 of about 768,175 (328)
Diagrammatic Quantum Monte Carlo for Two-Body Problem: Exciton [PDF]
, 2001 We present a novel method for precise numerical solution of the irreducible two-body problem and apply it to excitons in solids. The approach is based on the Monte Carlo simulation of the two-body Green function specified by Feynman's diagrammatic ...
A. S. Mishchenko +23 more
core +3 more sources
Some Results on Polynomial Numerical Hulls of Perturbed Matrices [PDF]
Sahand Communications in Mathematical Analysis, 2019 In this paper, the behavior of the pseudopolynomial numerical hull of a square complex matrix with respect to structured perturbations and its radius is investigated.
Madjid Khakshour, Gholamreza Aghamollaei
doaj +1 more source
On the Numerical Range and Numerical Radius of the Volterra Operator
Известия Иркутского государственного университета: Серия "Математика", 2018 In this paper, we investigated the numerical range and the numerical radius of the classical Volterra operator on the complex space $L^2[0,1]$. In particular, we determined the numerical range, the numerical radius of real and imaginary part of the ...
L. Khadkhuu, D. Tsedenbayar
doaj +1 more source
Some operator mean inequalities for sector matrices
AIMS Mathematics, 2022 In this article, we obtain some operator mean inequalities of sectorial matrices involving operator monotone functions. Among other results, it is shown that if $ A, B\in\mathbb{M}_n(\mathbb{C}) $ are such that $ W(A), W(B)\subseteq S_{\alpha} $, $ f, g,
Chaojun Yang
doaj +1 more source
Structure of a Bathtub Vortex : Importance of the Bottom Boundary Layer [PDF]
, 2010 A bathtub vortex in a cylindrical tank rotating at a constant angular velocity [omega] is studied by meansof a laboratory experiment, a numerical experiment and a boundary layer theory.
A. Andersen +13 more
core +1 more source
New estimates for the numerical radius
Filomat, 2021 In this article, we present new inequalities for the numerical radius of the sum of two Hilbert space operators. These new inequalities will enable us to obtain many generalizations and refinements of some well known inequalities, including multiplicative behavior of the numerical radius and norm bounds. Among many other applications, it is
Moradi, Hamid Reza, Sababheh, Mohammad
openaire +3 more sources
Some refinements of numerical radius inequalities [PDF]
Ukrains’kyi Matematychnyi Zhurnal, 2020 UDC 517.5 In this paper, we give some refinements for the second inequality in where In particular, if is hyponormal by refining the Young inequality with the Kantorovich constant we show that where and . We also give a reverse for the classical numerical radius power inequality for any operator in the case when
Heydarbeygi, Z. +2 more
openaire +3 more sources
INEQUALITIES FOR THE NORM AND NUMERICAL RADIUS FOR HILBERT 𝐶 * -MODULE OPERATORS
Проблемы анализа, 2020 In this paper, we introduce some inequalities between the operator norm and the numerical radius of adjointable operators on Hilbert 𝐶*-module spaces.
Mohsen Shah Hosseini, Baharak Moosavi
doaj +1 more source
On Some Numerical Radius Inequalities Involving Generalized Aluthge Transform
Journal of Function Spaces, 2022 Let S be any bounded linear operator defined on a complex Hilbert space H. In this paper, we present some numerical radius inequalities involving the generalized Aluthge transform to attain upper bounds for numerical radius.
Javariya Hyder +3 more
doaj +1 more source
Singularities in droplet pinching with vanishing viscosity [PDF]
, 1999 A slender-jet model for the pinching of a liquid column is considered in the limit of vanishing viscosity. We find the model to develop a singularity in the gradients of the local radius and the velocity at a finite thread radius, so it does not describe
Eggers, Jens
core +1 more source