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Oscar Oscar Rojo Rojo

UNIVERSIDAD CATÓLICA DEL NORTE

Antofagasta, Chile

Spectral Graph Theory; Theory of Matrices


The distance Randic matrix of connected graphs Díaz R. C.; Rojo, O Article BULLETIN OF THE BRAZILIAN MATHEMATICAL SOCIETY (2021)
On the minimal D?? spectral radius of graphs subject to fixed connectivity DÃaz R.C.; PastÃ©n G.; Rojo O. Article ISI SCOPUS (2020)
The maximal ??index of trees with k pendent vertices and its computation Rojo O. Article SCOPUS Electronic Journal of Linear Algebra (2020)
EFFECTS ON THE DISTANCE LAPLACIAN SPECTRUM OF GRAPHS WITH CLUSTERS BY ADDING EDGES DÃaz R.C.; Rojo O. Article ISI SCOPUS ELECTRONIC JOURNAL OF LINEAR ALGEBRA (2019)
New bounds on the distance Laplacian and distance signless Laplacian spectral radii Roberto C. Díaz; Ana I. Julio; Óscar Rojo Article SCIELO Proyecciones (Antofagasta) - Revista de matemática (2019)
New results on the D-alpha-matrix of connected graphs DÃaz R.C.; PastÃ©n G.; Rojo O. Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2019)
Distance matrices on the H-join of graphs: A general result and applications Cardoso D.M.; DÃaz R.C.; Rojo O. Article ISI SCOPUS Linear Algebra and Its Applications (2018)
Sharp upper bounds on the distance energies of a graph Diaz, RC; Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2018)
M-matrices with prescribed elementary divisors Soto R.L.; Díaz R.C.; Salas M.; Rojo O. Article ISI SCOPUS INVERSE PROBLEMS (2017)
ON TREES WITH MAXIMUM ALGEBRAIC CONNECTIVITY Abreu N.; Markenzon L.; Lee L.; Rojo, O Article ISI SCOPUS APPLICABLE ANALYSIS AND DISCRETE MATHEMATICS (2016)
Effects on the Energy and Estrada Indices by Adding Edges Among Pendent Vertices Rojo, O Article ISI SCOPUS Match (2015)
Laplacian Spectrum, Laplacian-Energy-Like Invariant, and Kirchhoff Index of Graphs Constructed by Adding Edges on Pendent Vertices Pasten, G; Rojo, O Article ISI SCOPUS MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY (2015)
On the Faria's inequality for the Laplacian and signless Laplacian spectra: A unified approach Andrade, E; Cardoso D.M.; Pasten, G; Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2015)
The largest Laplacian and adjacency indices of complete caterpillars of fixed diameter Abreu, Nair; Lenes, Eber; Rojo, Oscar Article Proyecciones (2015)
Ordering trees and graphs with few cycles by algebraic connectivity Abreu N.; Justel, CM; Rojo, O; Trevisan, V Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2014)
A NEW UPPER BOUND ON THE LARGEST NORMALIZED LAPLACIAN EIGENVALUE Rojo, O; Soto, RL Article ISI SCOPUS Operators and Matrices (2013)
A sharp upper bound on the incidence energy of graphs in terms of connectivity Rojo, O; Lenes E. Article ISI SCOPUS Linear Algebra and Its Applications (2013)
COPIES OF A ROOTED WEIGHTED GRAPH ATTACHED TO AN ARBITRARY WEIGHTED GRAPH AND APPLICATIONS Cardoso, DM; Martins, EA; Robbiano, M; Rojo, O Article ISI SCOPUS Electronic Journal of Linear Algebra (2013)
Eigenvalues of a H-generalized join graph operation constrained by vertex subsets Cardoso, DM; Martins, EA; Robbiano, M; Rojo, O Article ISI SCOPUS Linear Algebra and Its Applications (2013)
An upper bound on the largest signless Laplacian of an odd unicyclic graph Collao, M; Pizarro, P.; Rojo, O Article SCIELO SCOPUS Proyecciones (Antofagasta) - Revista de matemática (2012)
Construction of Bipartite Graphs Having the Same Randle Energy Rojo, O; Medina, L Article ISI MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY (2012)
Eigenvalues of certain weighted graphs joined at their roots having cliques at some levels Medina, L; Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2012)
Algebraic connectivity on a subclass of caterpillars Rojo, O; Rocha, I; Trevisan, V Article SCOPUS ELECTRONIC NOTES IN DISCRETE MATHEMATICS (2011)
Line graph eigenvalues and line energy of caterpillars Rojo, O Article ISI SCOPUS Linear Algebra and Its Applications (2011)
Line graph of combinations of generalized Bethe trees: Eigenvalues and energy Rojo, O; Jimenez, RD Article ISI SCOPUS Linear Algebra and Its Applications (2011)
ON NONNEGATIVE REALIZATION OF PARTITIONED SPECTRA Soto, RL; Rojo, O; Manzaneda, CB Article ISI SCOPUS Electronic Journal of Linear Algebra (2011)
SPECTRA OF WEIGHTED ROOTED GRAPHS HAVING PRESCRIBED SUBGRAPHS AT SOME LEVELS Rojo, O; Robbiano, M; Cardoso, DM; Martins, EA Article ISI SCOPUS Electronic Journal of Linear Algebra (2011)
ALGEBRAIC CONNECTIVITY FOR SUBCLASSES OF CATERPILLARS Abreu N.; Rojo, O; Justel, C Article ISI SCOPUS Applicable Analysis and Discrete Mathematics (2010)
Energy of line graphs Gutman I.; Robbiano, M; Martins, EA; Cardoso, DM; Medina, L; Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2010)
EXTREMAL ALGEBRAIC CONNECTIVITIES OF CERTAIN CATERPILLAR CLASSES AND SYMMETRIC CATERPILLARS Rojo, O; Medina, L; De Abreu, NMM; Justel, C Article ISI SCOPUS ELECTRONIC JOURNAL OF LINEAR ALGEBRA (2010)
On the algebraic connectivity of some caterpillars: A sharp upper bound and a total ordering Rojo, O; Medina, L; Abreu N.; Justel, C Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2010)
Spectral characterization of some weighted rooted graphs with cliques Rojo, O; Medina, L Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2010)
Computing tight upper bounds on the algebraic connectivity of certain graphs Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2009)
Constructing Graphs with Energy root rE(G) where G is a Bipartite Graph Rojo, O; Medina, L Article ISI MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY (2009)
Guo perturbation for symmetric nonnegative circulant matrices Rojo, O; Soto, RL Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2009)
Maximizing the algebraic connectivity for a subclass of caterpillars Rojo, O; Medina, L; Abreu N.; Justel, C Article SCOPUS Electronic Notes in Discrete Mathematics (2009)
Spectra of copies of a generalized Bethe tree attached to any graph Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2009)
Spectra of generalized Bethe trees attached to a path Rojo, O; Medina, L Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2009)
SPECTRA OF WEIGHTED COMPOUND GRAPHS OF GENERALIZED BETHE TREES Rojo, O; Medina, L Article ISI SCOPUS ELECTRONIC JOURNAL OF LINEAR ALGEBRA (2009)
A new algebra of Toeplitz-plus-Hankel matrices and applications Rojo, O Article ISI SCOPUS COMPUTERS & MATHEMATICS WITH APPLICATIONS (2008)
New upper bounds on the spectral radius of unicyclic graphs Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2008)
Spectra of weighted generalized Bethe trees joined at the root Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2008)
A nontrivial upper bound on the largest Laplacian eigenvalue of weighted graphs Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2007)
An explicit formula for eigenvalues of Bethe trees and upper bounds on the largest eigenvalue of any tree Rojo, O; Robbiano, M Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2007)
Isospectral flows preserving some centrosymmetric structures Gladwell, GML; Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2007)
Isospectral flows that preserve matrix structure Gladwell, GML; Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2007)
On the spectra of some weighted rooted trees and applications Rojo, O; Robbiano, M Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2007)
On the sth Laplacian eigenvalue of trees of order st+1 Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2007)
Symmetric nonnegative realization of spectra Soto, RL; Rojo, O; Moro, J; Borobia, A Article ISI SCOPUS ELECTRONIC JOURNAL OF LINEAR ALGEBRA (2007)
The spectra of a graph obtained from copies of a generalized Bethe tree Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2007)
Applications of a Brauer theorem in the nonnegative inverse eigenvalue problem Soto, RL; Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2006)
Inequalities involving the mean and the standard deviation of nonnegative real numbers Rojo, O Article ISI SCOPUS JOURNAL OF INEQUALITIES AND APPLICATIONS (2006)
On the spectra of certain rooted trees Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2006)
The spectra of some trees and bounds for the largest eigenvalue of any tree Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2006)
Tight bounds on the algebraic connectivity of Bethe trees Rojo, O; Medina, L Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2006)
Improved bounds for the largest eigenvalue of trees Rojo, O Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2005)
The spectra of the adjacency matrix and Laplacian matrix for some balanced trees Rojo, O; Soto R. Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2005)
A decreasing sequence of upper bounds on the largest Laplacian eigenvalue of a graph Rojo, O; Rojo, H Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2004)
Some results on symmetric circulant matrices and on symmetric centrosymmetric matrices Rojo, O; Rojo, H Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2004)
THE SPECTRUM OF THE LAPLACIAN MATRIX OF A BALANCED 2p-ARY TREE Rojo, Oscar Article SCIELO Proyecciones (Antofagasta) - Revista de matemática (2004)
A note on the integer eigenvalues of the Laplacian matrix of a balanced binary tree Rojo, O; Pena M. Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2003)
Constructing symmetric nonnegative matrices via the fast Fourier transform Rojo, O; Rojo, H Article ISI SCOPUS COMPUTERS & MATHEMATICS WITH APPLICATIONS (2003)
Existence and construction of nonnegative matrices with complex spectrum Rojo, O; Soto, RL Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2003)
The spectrum of the Laplacian matrix of a balanced binary tree Rojo, O Article ISI LINEAR ALGEBRA AND ITS APPLICATIONS (2002)
A note on the construction of a positive oscillatory matrix with a prescribed spectrum Rojo, O; Soto R.; Egana, J Article ISI SCOPUS COMPUTERS & MATHEMATICS WITH APPLICATIONS (2001)
Fast construction of a symmetric nonnegative matrix with a prescribed spectrum Rojo, O; Soto R.; Rojo, H Article ISI SCOPUS COMPUTERS & MATHEMATICS WITH APPLICATIONS (2001)
An always nontrivial upper bound for Laplacian graph eigenvalues Rojo, O; Soto R.; Rojo, H Article ISI SCOPUS LINEAR ALGEBRA AND ITS APPLICATIONS (2000)
Bounds for sums of eigenvalues and applications Rojo, O; Soto R.; Rojo, H Article ISI SCOPUS COMPUTERS & MATHEMATICS WITH APPLICATIONS (2000)


MATRICES ON A GRAPH=> EIGENVALUES, ENERGIES, ORDERING AND CONJECTURES FONDECYT (1130135) Proyecto 2013-2016 Inv. Responsable
INVERSE ELEMENTARY DIVISORS PROBLEM FOR NONNEGATIVE MATRICES FONDECYT (1120180) Proyecto 2012-2015 Coinvestigador(a)
GRAPH EIGENVALUES, ORDERING TREES AND GRAPH ENERGIES FONDECYT (1100072) Proyecto 2010-2013 Inv. Responsable
NONNEGATIVE REALIZATION OF SPECTRA AND RELATED TOPICS FONDECYT (1085125) Proyecto 2008-2011 Coinvestigador(a)
EIGENVALUES OF GRAPHS AND NONNEGATIVE INVERSE EIGENVALUE PROBLEMS FONDECYT (1070537) Proyecto 2007-2010 Inv. Responsable
REALIZABILITY CRITERIA AND NEGATIVITY COMPENSATION IN THE NONNEGATIVE INVERSE SPECTRUM PROBLEM FONDECYT (1050026) Proyecto 2005-2008 Coinvestigador(a)
SOME STRUCTURED INVERSE EIGENVALUE PROBLEMS AND LAPLACIAN GRAPH EIGENVALUES FONDECYT (1040218) Proyecto 2004-2007 Inv. Responsable
INVERSE EIGENVALUE PROBLEMS FOR NONNEGATIVE MATRICES. FONDECYT (1010304) Proyecto 2001-2004 Inv. Responsable
SINGULAR CONTROL SYSTEMS ON LIE GROUPS. FONDECYT (1990360) Proyecto 1999-2002 Coinvestigador(a)
COTAS PARA VALORES SINGULARES DE MATRICES FONDECYT (1970635) Proyecto 1997-1999 Inv. Responsable
LOCALIZACION DE AUTOVALORES DE MATRICES Y CONSTRUCCION DE OBSERVADORES FONDECYT (1941137) Proyecto 1994-1997 Coinvestigador(a)
PROBLEMAS INVERSOS DE AUTOVALOR PARA MATRICES FONDECYT (1910273) Proyecto 1991-1993 Investigador(a)