Results 31 to 40 of about 244 (170)

Positive entries of stable matrices

, 2004
The question of how many elements of a real stable matrix must be positive is investigated. It is shown that any real stable matrix of order greater than 1 has at least two positive entries.
Rump, Siegfried, Daniel Hershkowitz, Rump, Siegfried M., Hershkowitz, Daniel, Shmuel Friedland, Siegfried M. Rump, Friedland, Shmuel   +6 more
core   +1 more source

Eigenvalue Localization Inequalities for Complex Matrices With Order n≥3

Advances in Mathematical Physics
MSC2020 Classification: 15A18, 15A60 ...
Rong Ma, Feng Zhang
doaj   +1 more source

A Fourth‐Order Ulm‐Type Method for Inverse Eigenvalue Problems

Journal of Applied Mathematics, Volume 2025, Issue 1, 2025.
In this paper, we propose a fourth‐order Ulm‐type method for solving inverse eigenvalue problems based on a two‐step Ulm‐type iterative process and Cayley transform. Under some mild assumptions, our results indicate that our method is fourth‐order convergent. The numerical implementation proves the effectiveness of the proposed method.
Xin Li, Wei Ma, Zhaojie Zhou
wiley   +1 more source

An ℋ-tensor-based criteria for testing the positive definiteness of multivariate homogeneous forms

Open Mathematics, 2022
A positive definite homogeneous multivariate form plays an important role in the field of optimization, and positive definiteness of the form can be identified by a special structured tensor.
Bai Dongjian, Wang Feng
doaj   +1 more source

Update on the role of genetic factors, environmental factors and allergens in canine atopic dermatitis

Veterinary Dermatology, Volume 35, Issue 1, Page 15-24, February 2024.
Background – Canine atopic dermatitis (cAD) is a common, complex and multifactorial disease involving, among others, genetic predisposition, environmental factors and allergic sensitisation. Objective – This review summarises the current evidence on the role of genetic and environmental factors and allergic sensitisation in the pathogenesis of cAD ...
Patrick Hensel, Manolis Saridomichelakis, Melissa Eisenschenk, Chie Tamamoto‐Mochizuki, Cherie Pucheu‐Haston, Domenico Santoro, for the International Committee on Allergic Diseases of Animals (ICADA), Frane Banovic, Emmanuel Bensignor, Douglas DeBoer, Craig Griffin, Ralf Mueller, Tim Nuttall, Christine Prost   +13 more
wiley   +1 more source

The location of classified edges due to the change in the geometric multiplicity of an eigenvalue in a tree

Special Matrices, 2019
Given a combinatorially symmetric matrix A whose graph is a tree T and its eigenvalues, edges in T can be classified in four categories, based upon the change in geometric multiplicity of a particular eigenvalue, when the edge is removed.
Toyonaga Kenji
doaj   +1 more source

On the minimum spectral radius of connected graphs of given order and size

Special Matrices
In this article, we study a question of Hong from 1993 related to the minimum spectral radii of the adjacency matrices of connected graphs of given order and size.
Cioaba Sebastian M., Gupta Vishal, Marques Celso   +2 more
doaj   +1 more source

Changes in signature induced by the Lyapunov mapping LA : X → AX + XAA±

, 1989
International Journal of Mathematics and Mathematical Sciences, Volume 12, Issue 3, Page 503-506, 1989.
Tyler Haynes
wiley   +1 more source

A simultaneous reconstruction of missing data in DNA microarrays. Linear Algebra and its Applications

, 2020
We suggest here a new method of the estimation of missing entries in a gene expression matrix, which is done simultaneously-i.e., the estimation of one missing entry influences the estimation of other entries. Our method is closely related to the methods
Amir Niknejad, Shmuel Friedland, Laura Chihara   +2 more
core  

Bordering method to compute Core-EP inverse

Special Matrices, 2018
Following the work of Kentaro Nomakuchi[10] and Manjunatha Prasad et.al., [7] which relate various generalized inverses of a given matrix with suitable bordering,we describe the explicit bordering required to obtain core-EP inverse, core-EP generalized ...
Prasad K. Manjunatha, Raj M. David
doaj   +1 more source