3 citations · 7 across the 7 of their papers we have counts for
9 papers
Centrosymmetric nonnegative realization of spectra
Ana I. Julio, Oscar Rojo, Ricardo L. Soto
A list of complex numbers is said to be realizable if it is the spectrum of an entrywise nonnegative matrix. In this paper we intent to characteri…
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…
On the -index of graphs with pendent paths
Vladimir Nikiforov, Oscar Rojo
Let be a graph with adjacency matrix and let be the diagonal matrix of the degrees of . For every real , write fo…
Computing the eigenvalues of a bug
Oscar Rojo
Let be a simple undirected graph. For , let \begin{equation*} A_α\left( G\right) =αD\left( G\right) +(1-α)A\left( G\right) , \end{equation*} where is the adj…
-spectrum of a graph obtained by copies of a rooted graph and applications
Oscar Rojo
Given a connected graph on vertices and a rooted graph let be the graph obtained from copies of and the graph by identifying the root of the $i-th…
A note on the positive semidefinitness of
Vladimir Nikiforov, Oscar Rojo
Let be a graph with adjacency matrix and let be the diagonal matrix of the degrees of . For every real , write fo…