Results 51 to 60 of about 1,935 (133)

Achievable multiplicity partitions in the inverse eigenvalue problem of a graph

Special Matrices, 2019
Associated to a graph G is a set 𝒮(G) of all real-valued symmetric matrices whose off-diagonal entries are nonzero precisely when the corresponding vertices of the graph are adjacent, and the diagonal entries are free to be chosen.
Adm Mohammad, Fallat Shaun, Meagher Karen, Nasserasr Shahla, Plosker Sarah, Yang Boting   +5 more
doaj   +1 more source

On minimum algebraic connectivity of graphs whose complements are bicyclic

Open Mathematics, 2019
The second smallest eigenvalue of the Laplacian matrix of a graph (network) is called its algebraic connectivity which is used to diagnose Alzheimer’s disease, distinguish the group differences, measure the robustness, construct multiplex model ...
Liu Jia-Bao, Javaid Muhammad, Raza Mohsin, Saleem Naeem   +3 more
doaj   +1 more source

The non-negative spectrum of a digraph

Open Mathematics, 2020
Given the adjacency matrix A of a digraph, the eigenvalues of the matrix AAT constitute the so-called non-negative spectrum of this digraph. We investigate the relation between the structure of digraphs and their non-negative spectra and associated ...
Alomari Omar, Abudayah Mohammad, Sander Torsten   +2 more
doaj   +1 more source

A convergence analysis of SOR iterative methods for linear systems with weak H-matrices

Open Mathematics, 2016
It is well known that SOR iterative methods are convergent for linear systems, whose coefficient matrices are strictly or irreducibly diagonally dominant matrices and strong H-matrices (whose comparison matrices are nonsingular M-matrices).
Zhang Cheng-yi, Xue Zichen, Luo Shuanghua   +2 more
doaj   +1 more source

Bound for the largest singular value of nonnegative rectangular tensors

Open Mathematics, 2016
In this paper, we give a new bound for the largest singular value of nonnegative rectangular tensors when m = n, which is tighter than the bound provided by Yang and Yang in “Singular values of nonnegative rectangular tensors”, Front. Math.
He Jun, Liu Yan-Min, Ke Hua, Tian Jun-Kang, Li Xiang   +4 more
doaj   +1 more source

Two new eigenvalue localization sets for tensors and theirs applications

Open Mathematics, 2017
A new eigenvalue localization set for tensors is given and proved to be tighter than those presented by Qi (J. Symbolic Comput., 2005, 40, 1302-1324) and Li et al. (Numer. Linear Algebra Appl., 2014, 21, 39-50).
Zhao Jianxing, Sang Caili
doaj   +1 more source

Potential counter-examples to a conjecture on the column space of the adjacency matrix

Special Matrices
Attempts to resolve the Akbari-Cameron-Khosrovshahi-conjecture have so far focused on the rank of a matrix. The conjecture claims that there exists a nonzero (0, 1)-vector in the row space of a (0, 1)-adjacency matrix A{\bf{A}} of a graph GG, that is not
Sciriha Irene, Kaur Bableen, Borg James L., Debono Mark   +3 more
doaj   +1 more source

Sombor spectra of chain graphs. [PDF]

Heliyon, 2023
Imran M, Rather BA.
europepmc   +1 more source

Some stable and closed-shell structures of anticancer drugs by graph theoretical parameters. [PDF]

Heliyon, 2023
Koam ANA, Ahmad A, Azeem M, Hakami KH, Elahi K.   +4 more
europepmc   +1 more source

Convergence analysis of non-matching finite elements for a linear monotone additive Schwarz scheme for semi-linear elliptic problems

Nonlinear Engineering
In this article, we are interested in the standard finite element approximation method of linear additive Schwarz iterations for a class of semi-linear elliptic problems, for two subdomains, in the context of non-matching grids.
Al Farei Qais, Boulbrachene Messaoud
doaj   +1 more source