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Matrix versions of some basic convexity inequalities are given. Further results on the same topic are proved in the recent papers on arxiv: 1. Hermitian operators and convex functions, 2. A concavity inequality for symmetric norms, 3.…

泛函分析 · 数学 2007-05-23 Jean-Christophe Bourin

In this paper, we introduce the concept of operator arithmetic-geometrically convex functions for positive linear operators and prove some Hermite-Hadamard type inequalities for these functions. As applications, we obtain trace inequalities…

泛函分析 · 数学 2016-03-16 Ali Taghavi , Vahid Darvish , Haji Mohammad Nazari

Several inequalities for eigenvalues involving convex combinations and compressions are given. These inequalities are matrix version of the basic convexity inequality f((a+b)/2) < (f(a)+f(b))/2.

算子代数 · 数学 2007-05-23 Jean-Christophe Bourin

Some rearrangement inequalities for symmetric norms on matrices are given as well as related results for operator convex functions.

泛函分析 · 数学 2007-05-23 Jean-Christophe Bourin

In this paper, we introduce the concept of operator geometrically convex functions for positive linear operators and prove some Hermite-Hadamard type inequalities for these functions. As applications, we obtain trace inequalities for…

泛函分析 · 数学 2015-08-14 Ali Taghavi , Vahid Darvish , Haji Mohammad Nazari , Sever S. Dragomir

This article improves the triangle inequality for complex numbers, using the Hermite-Hadamard inequality for convex functions. Then, applications of the obtained refinement are presented to include some operator inequalities. The operator…

泛函分析 · 数学 2022-04-19 Shigeru Furuichi , Mohammad Sababheh , Hamid Reza Moradi

We present several matrix and operator inequalities of Hermite-Hadamard type. We first establish a majorization version for monotone convex functions on matrices. We then utilize the Mond-Pecaric method to get an operator version for convex…

泛函分析 · 数学 2013-04-02 Mohammad Sal Moslehian

In this work, an operator superquadratic function (in operator sense) for positive Hilbert space operators is defined. Several examples with some important properties together with some observations which are related to the operator…

泛函分析 · 数学 2019-12-17 M. W. Alomari

We establish in this paper some inequalities for analytic and convex functions on an open interval and positive normalized functionals defined on a Hermitian unital Banach *-algebra. Reverses and refinements of Jensen's and Slater's type…

泛函分析 · 数学 2016-12-20 Silvestru Sever Dragomir

Subaddivity type matrix inequalities for concave funcions and symetric norms are given.

泛函分析 · 数学 2008-04-08 Jean-Christophe Bourin , Eun-Young Lee

In this paper we introduce operator s-convex func- tions and establish some Hermite-Hadamard type inequalities in which some operator s-convex functions of positive operators in Hilbert spaces are involved.

泛函分析 · 数学 2014-07-10 Amir Ghasem Ghazanfari

Eigenvalues inequalities involving (log) convex/concav functions and Hermitian matrices, positive unital maps are considered. Simple proofs of Bhatia-Kittaneh inequality and Naimark dilation theorem are given.

算子代数 · 数学 2007-05-23 Jaspal Singh Aujla Jean-Christophe Bourin

In this paper, we prove some Hermite-Hadamard type inequalities for operator geometrically convex functions for non-commutative operators. Keywords: Operator geometrically convex function, Hermite-Hadamard inequality.

泛函分析 · 数学 2018-07-24 Ali Taghavi , Vahid Darvish , Tahere Azimi Roushan

Some of the important inequalities associated with quantum entropy are immediate algebraic consequences of the Hansen-Pedersen-Jensen inequality. A general argument is given using matrix perspectives of operator convex functions. A matrix…

数学物理 · 物理学 2009-11-13 Edward G. Effros

In this paper, some Jensen's type inequalities between quaternionic bounded selfadjoint operators on quaternionic Hilbert spaces are proved, using a log-convex function. Also, by applying a specific log-convex function, some particular…

泛函分析 · 数学 2025-04-17 Massoumeh Fashandi

Well-known subadditivity results for positive operators (of Brown-Kosaki and Rotfeld/Ando-Zhan types) are extended to Hermitian and normal ones. Applications to Cartesian decomposition and block-matrices are given.

泛函分析 · 数学 2009-06-09 jean-Christophe Bourin

The matrix logarithm, when applied to Hermitian positive definite matrices, is concave with respect to the positive semidefinite order. This operator concavity property leads to numerous concavity and convexity results for other matrix…

最优化与控制 · 数学 2019-12-06 Hamza Fawzi , James Saunderson , Pablo A. Parrilo

In this paper, we state some characterizations of $h$-convex function is defined on a convex set in a linear space. By doing so, we extend the Jensen-Mercer inequality for $h$-convex function. We will also define $h$-convex function for…

泛函分析 · 数学 2020-03-31 M. Abbasi , A. Morassaei , F. Mirzapour

Inequalities play an important role in pure and applied mathematics. In particular, Jensen's inequality, one of the most famous inequalities, plays a main role in the study of the existence and uniqueness of initial and boundary value…

经典分析与常微分方程 · 数学 2022-02-09 Yamilet Quintana , José M. Rodríguez , José M. Sigarreta Almira

Mercer inequality for convex functions is a variant of Jensen's inequality, with an operator version that is still valid without operator convexity. This paper is two folded. First, we present a Mercer-type inequality for operators without…

泛函分析 · 数学 2020-03-06 H. R. Moradi , S. Furuichi , M. Sababheh
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