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math.CO2023
New results about the Inverse Eigenvalue Problem of a Graph
Roberto C. Díaz, Ana I. Julio
All graphs considered are simple and undirected. The Inverse Eigenvalue Problem of a Graph (IEP-G) aims to find all possible spectra for matrices whose entry, for $i\ne…
math.CO2021
Perturbing eigenvalues of nonnegative centrosymmetric matrices
Roberto C. Díaz, Ana I. Julio, Yankis R. Linares
An matrix is said to be {\it centrosymmetric} if it satisfies the relation , where is the counteridentity matrix. Centrosymmetric matrices ha…
math.CO2018
New bounds on the distance Laplacian and distance signless Laplacian spectral radii
Roberto C. Díaz, Ana I. Julio, Oscar Rojo
Let G be a simple undirected connected graph. In this paper, new upper bounds on the distance Laplacian spectral radius of G are obtained. Moreover, new lower and upper bounds for…