1 citations · 1 across the 11 of their papers we have counts for
13 papers
On properties of the conformal circulant matrices
Cristina Manzaneda, Enide Andrade
In this paper, we introduce and study conformal permutation matrices. In particular, for a permutation , we define the corresponding conformal permutation matrix $H_{π_…
On the Vertex Seidel Energy of Graphs
Kalpesh M. Popat, Enide Andrade
We introduce the vertex Seidel energy via the diagonal entries of the absolute Seidel matrix. We establish a spectral formula, compute exact values for several graph families, deri…
Doubly Stochastic Matrices and Modified Laplacian Matrices of Graphs
Enide Andrade, Geir Dahl
We consider modified Laplacian matrices of graphs, obtained by adding the identity matrix to the Laplacian matrix of a graph . This results in a positive definite matrix $…
Combinatorial Fiedler Theory and Graph Partition
Enide Andrade, Geir Dahl
Partition problems in graphs are extremely important in applications, as shown in the Data science and Machine learning literature. One approach is spectral partitioning based on a…
On the Eigenvectors of Generalized Circulant Matrices
Enide Andrade, Dante Carrasco-Olivera, Cristina Manzaneda
In this paper, closed formulas for the eigenvectors of a particular class of matrices generated by generalized permutation matrices, named generalized circulant matrices, are prese…
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…
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…