1 citations · 2 across the 9 of their papers we have counts for
11 papers
On the spectra of -circulant matrices and applications
Enide Andrade, Luis Arrieta, María Robbiano
A g-circulant matrix of order n is defined as a matrix of order n where each row is a right cyclic shift in g-places to the preceding row. Using number theory, certain nonnegative…
New lower bounds for the energy of matrices and graphs
Enide Andrade, Juan Carmona, Geraldine Infante +1
Let be a Hermitian matrix. The energy of , , corresponds to the sum of the absolute values of its eigenvalues. In this work it is obtained two lower bounds f…
Bounds for Different Spreads of Line and Total Graphs
E. Andrade, E. Lenes, E. Mallea +2
In this paper we explore some results concerning the spread of the line and the total graph of a given graph. In particular, it is proved that for an connected graph wi…
Guo's index for some classes of matrices
María Robbiano
A permutative matrix is a square matrix such that every row is a permutation of the first row. A circulant matrix is a matrix where each row is a cyclic shift of the row above to t…
On the diameter and incidence energy of iterated total graphs
Eber Lenes, Exequiel Mallea-Zepeda, María Robbiano +1
The total graph of , is the graph whose set of vertices is the union of the sets of vertices and edges of , where two vertices are adjacent if and only if the…
Lower bounds for Laplacian spread and relations with invariant parameters revisited
Enide Andrade, Maria Aguieiras A. de Freitas, María Robbiano +1
Let be an -graph and a nonempty proper subset of . Let $X^{c}=V\left( G\right) \ba…
New Bounds for the Signless Laplacian Spread
Enide Andrade, Geir Dahl, Laura Leal +1
Let be a simple graph. The signless Laplacian spread of is defined as the maximum distance of pairs of its signless Laplacian eigenvalues. This paper establishes some new b…
Block matrices and Guo's Index for block circulant matrices with circulant blocks
Enide Andrade, Cristina Manzaneda, Hans Nina +1
In this paper we deal with circulant and partitioned into -by- circulant blocks matrices and introduce spectral results concerning this class of matrices. The problem of find…
Realizable Lists on a Class of Nonnegative Matrices
Cristina B. Manzaneda, Enide Andrade, María Robbiano
A square matrix of order n with is called permutative matrix when all its rows (up to the frst one) are permutations of precisely its frst row. In this paper recalling sp…
Realizable lists via the spectra of structured matrices
Cristina B. Manzaneda, Enide Andrade, María Robbiano
A square matrix of order with is called a \textit{permutative matrix} or permutative when all its rows (up to the first one) are permutations of precisely its first r…
Eigenvalues of a H-generalized join graph operation constrained by vertex subsets
Domingos M. Cardoso, Enide A. Martins, Maria Robbiano +1
Considering a graph of order , a generalized -join operation of a family of graphs , constrained by a family of vertex subsets , $i=1,…