Extremal matrices in certain determinantal inequalities

The extremal matrices in certain inequalities for determinants of sums are characterized. Related determinantal inequalities involving Hadamard products of positive definite matrices are presented. These inequalities are easy consequences of majorization results recently obtained by Ando and Visick.     

Bounds and majorization relations for the critical points of polynomials

We apply several matrix inequalities to the derivative companion matrices of complex polynomials to establish new bounds and majorization relations for the critical points of these polynomials in terms of their zeros.     

Bounds and a majorization for the real parts of the zeros of polynomials

We apply some eigenvalue inequalities to the real parts of the Frobenius companion matrices of monic polynomials to establish new bounds and a majorization for the real parts of the zeros of these polynomials.

     

矩阵Hadamard乘积的不等式

本文运用矩阵 Hadamard乘积及控制不等式的性质 ,获得了若干 Hermite及斜 Hermite矩阵特征值的不等式     

Eigenvalue inequalities associated with the cartesian decomposition

Let T=A+iB where AB are Hermitian matrices. We obtain several inequalities relating the l_p distance between the eigenvalues of A and those of iB with the Schatten p-norm of T. The majorization results which lead to these inequalities are also used to get simple proofs of some known lower and upper bounds for the determinant of T.     

Nilpotent completely positive maps

We study the structure of nilpotent completely positive maps in terms of Choi-Kraus coefficients. We prove several inequalities, including certain majorization type inequalities for dimensions of kernels of powers of nilpotent completely positive maps.     

Trumping and Power Majorization

Majorization is a basic concept in matrix theory that has found applications in numerous settings over the past century. Power majorization is a more specialized notion that has been studied in the theory of inequalities. On the other hand, the trumping relation has recently been considered in quantum information, specifically in entanglement theory. We explore the connections between trumping and power majorization. We prove an analogue of Rado’s theorem for power majorization and consider a number of examples.     

四元数矩阵积的特征值与奇异值的不等式

运用优化不等式理论和四元数体上的几何理论 ,得到了四元数矩阵积的特征值与奇异值的几个不等式 .     

一类对称函数不等式的加细和推广

利用控制不等式理论加细和推广了一类对称函数不等式,并给出一个几何应用。     

Schur-Ostrowski type theorems revisited

In this paper we extend Schur-Ostrowski theorem on Schur-convex functions from majorized vectors to separable ones. For this, we introduce a generalized Schur-Ostrowski?s condition. We apply the obtained result for cone orderings and group-induced cone orderings. Finally, we give some interpretations for absolutely weak majorization and for group majorization on the space of complex matrices.     

Bounds and Majorization Relations for the Zeros of Polynomials

We use matrix inequalities to prove several bounds and majorization relations for the zeros of polynomials. Our results generalize the classic bound of Montel and improve some other known bounds.     

Cone orderings,group majorizations and similarly separable vectors

We generalize some results on majorization in papers by Wu and Debnath [S. Wu, L. Debnath, Inequalities for convex sequences and their applications, Comput. Math. Appl. 54 (2007) 525–534] and Marshall et al. [A.W. Marshall, I. Olkin, F. Proschan, Monotonicity of ratios of means and other applications of majorization, in: O. Shisha (Ed.), Inequalities, Academic Press, New York, 1967, pp. 177–190]. We present sufficient conditions for some vector inequalities to hold in the case of cone orderings and group-induced cone orderings. The framework used is based on results for similarly separable vectors given in paper [M. Niezgoda, Bifractional inequalities and convex cones, Discrete Math. 306 (2006) 231–243].     

Bounds and Majorization Relations for the Zeros of a Class of Fibonacci-Type Polynomials

We apply certain matrix inequalities involving eigenvalues, the numerical radius, and the spectral radius to obtain new bounds and majorization relations for the zeros of a class of Fibonacci-type polynomials. Our results improve upon some earlier bounds for the zeros of these polynomials.     

A group majorization ordering for Euclidean distance matrices

This paper investigates some properties of Euclidean distance matrices (EDMs) with focus on their ordering structure. The ordering treated here is the group majorization ordering induced by the group of permutation matrices. By using this notion, we establish two monotonicity results for EDMs: (i) The radius of a spherical Euclidean distance matrix (spherical EDM) is increasing with respect to the group majorization ordering. (ii) The larger an EDM is in terms of the group majorization ordering, the more spread out its eigenvalues are. Minimal elements with respect to this ordering are also described.     

A problem of Mirsky concerning nonsingular doubly stochastic matrices

The paper presents a new constructive proof of a theorem of Hardy, Littlewood, and Polya relating vector majorization and doubly stochastic matrices. Conditions on the vectors which guarantee that the corresponding matrices will be direct sums are given. These two results are applied to solve the problem, posed by Mirsky, of characterizing those majorization relations for which there is a corresponding doubly stochastic matrix which is nonsingular.     

Majorization and relative concavity

In this paper, some results established in [H.-N. Shi, Refinement and generalization of a class of inequalities for symmetric functions, Math. Practice Theory 29 (4) (1999) pp. 81-84] are extended from the classical majorization preordering to group-induced cone orderings. To this end the notion of relative concavity introduced in [C.P. Niculescu, F. Popovici, The extension of majorization inequalities within the framework of relative convexity, J. Inequal. Pure Appl. Math. 7 (1) (2005) (Article 27)] is used. In addition, some Ky Fan’s inequalities are discussed.     

Multivariate majorization and rearrangement inequalities with some applications to probability and statistics

Multivariate generalizations of the concept of a Schur convex-function are defined and characterized. These characterizations are shown to be useful in obtaining majorization and rearrangement inequalities. We give simple derivations of known results as well as new ones with applications in probability and statistics.     

Relatively Bounded and Relatively Compact Perturbations for Limit Circle Hamiltonian Systems

We study Fefferman–Stein inequalities for the dyadic square function associated with an integrable, Hilbert-space-valued function on the interval [0, 1). The proof rests on a Bellman function method: the estimates are deduced from the existence of certain special functions enjoying appropriate majorization and concavity.     

Similarity preserving linear maps on matrices

We determine all similarity preserving linear maps on the space of n x n complex matrices and all unitary equivalence preserving linear maps on the space of n x n Hermitian matrices. (Sub)majorization preserving linear maps on Hermitian matrices are also determined.     

一类对称函数的Schur-几何凸性Schur-调和凸性

讨论一类对称函数的Schur-几何凸性和Schur-调和凸性.作为应用,利用控制理论,也得到一些新的分析不等式.