Results 51 to 60 of about 256 (175)

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

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  

Properties of absolute-∗-k-paranormal operators and contractions for ∗-A(k) operators

, 2019
First, we see if T is absolute-∗-k-paranormal for k ≥ 1, then T is a normaloid operator. We also see some properties of absolute-∗-k-paranormal operator and ∗-A(k) operator.
BRAHA, Naim L., HOXHA, Ilmi, TATO, Agron
core   +1 more source

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

A Geršgorin-type eigenvalue localization set with n parameters for stochastic matrices

Open Mathematics, 2018
A set in the complex plane which involves n parameters in [0, 1] is given to localize all eigenvalues different from 1 for stochastic matrices. As an application of this set, an upper bound for the moduli of the subdominant eigenvalues of a stochastic ...
Wang Xiaoxiao, Li Chaoqian, Li Yaotang
doaj   +1 more source

Some new bounds of the minimum eigenvalue for the Hadamard product of an M-matrix and an inverse M-matrix

Open Mathematics, 2016
Some convergent sequences of the lower bounds of the minimum eigenvalue for the Hadamard product of a nonsingular M-matrix B and the inverse of a nonsingular M-matrix A are given by using Brauer’s theorem.
Zhao Jianxing, Sang Caili
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

On nested block designs geometry

Orthogonal designs, Orthogonal block structure, General balance, Commutativity of projectors, Commutative quadratic subspace, Primary 62J05, Secondary 05A15, 15A18,
Radosław Kala
core   +1 more source

The classification of edges and the change in multiplicity of an eigenvalue of a real symmetric matrix resulting from the change in an edge value

Special Matrices, 2017
We take as given a real symmetric matrix A, whose graph is a tree T, and the eigenvalues of A, with their multiplicities. Each edge of T may then be classified in one of four categories, based upon the change in multiplicity of a particular eigenvalue ...
Toyonaga Kenji, Johnson Charles R.
doaj   +1 more source

Fractional Revival of Threshold Graphs Under Laplacian Dynamics

Discussiones Mathematicae Graph Theory, 2020
We consider Laplacian fractional revival between two vertices of a graph X. Assume that it occurs at time τ between vertices 1 and 2. We prove that for the spectral decomposition L=∑r=0qθrErL = \sum\nolimits_{r = 0}^q {{\theta _r}{E_r}} of the Laplacian
Kirkland Steve, Zhang Xiaohong
doaj   +1 more source