Díaz, Roberto C.; Rojo, Oscar The distance Randić matrix of connected graphs. (English) Zbl 1484.05126 Bull. Braz. Math. Soc. (N.S.) 53, No. 1, 49-68 (2022). MSC: 05C50 05C12 05C40 15A18 PDFBibTeX XMLCite \textit{R. C. Díaz} and \textit{O. Rojo}, Bull. Braz. Math. Soc. (N.S.) 53, No. 1, 49--68 (2022; Zbl 1484.05126) Full Text: DOI
Rojo, Oscar The maximal \(\alpha\)-index of trees with \(k\) pendent vertices and its computation. (English) Zbl 1433.05206 Electron. J. Linear Algebra 36, 38-46 (2020). MSC: 05C50 05C05 05C09 15B48 PDFBibTeX XMLCite \textit{O. Rojo}, Electron. J. Linear Algebra 36, 38--46 (2020; Zbl 1433.05206) Full Text: Link
Cardoso, Domingos M.; Pastén, Germain; Rojo, Oscar Graphs with clusters perturbed by regular graphs – \(A_\alpha \)-spectrum and applications. (English) Zbl 1433.05188 Discuss. Math., Graph Theory 40, No. 2, 451-466 (2020). MSC: 05C50 05C76 05E30 15A18 05C09 PDFBibTeX XMLCite \textit{D. M. Cardoso} et al., Discuss. Math., Graph Theory 40, No. 2, 451--466 (2020; Zbl 1433.05188) Full Text: DOI
Díaz, Roberto C.; Pastén, Germain; Rojo, Oscar On the minimal \(\mathcal{D}_\alpha -\) spectral radius of graphs subject to fixed connectivity. (English) Zbl 1426.05180 Linear Algebra Appl. 584, 353-370 (2020). MSC: 05E30 15A18 05C50 05C12 05C40 PDFBibTeX XMLCite \textit{R. C. Díaz} et al., Linear Algebra Appl. 584, 353--370 (2020; Zbl 1426.05180) Full Text: DOI
Díaz, Roberto C.; Julio, Ana I.; Rojo, Óscar New bounds on the distance Laplacian and distance signless Laplacian spectral radii. (English) Zbl 1451.05138 Proyecciones 38, No. 4, 849-873 (2019). MSC: 05C50 15B48 PDFBibTeX XMLCite \textit{R. C. Díaz} et al., Proyecciones 38, No. 4, 849--873 (2019; Zbl 1451.05138) Full Text: DOI arXiv
Díaz, Roberto C.; Rojo, Oscar Effects on the distance Laplacian spectrum of graphs with clusters by adding edges. (English) Zbl 1430.05136 Electron. J. Linear Algebra 35, 511-523 (2019). MSC: 05E30 15A18 05C50 PDFBibTeX XMLCite \textit{R. C. Díaz} and \textit{O. Rojo}, Electron. J. Linear Algebra 35, 511--523 (2019; Zbl 1430.05136) Full Text: Link
Julio, Ana I.; Rojo, Oscar; Soto, Ricardo L. Centrosymmetric nonnegative realization of spectra. (English) Zbl 1420.15008 Linear Algebra Appl. 581, 260-284 (2019). MSC: 15A18 15A29 PDFBibTeX XMLCite \textit{A. I. Julio} et al., Linear Algebra Appl. 581, 260--284 (2019; Zbl 1420.15008) Full Text: DOI arXiv
Díaz, Roberto C.; Pastén, Germain; Rojo, Oscar New results on the \(\mathcal{D}_\alpha\)-matrix of connected graphs. (English) Zbl 1416.05170 Linear Algebra Appl. 577, 168-185 (2019). MSC: 05C50 05C12 15A18 PDFBibTeX XMLCite \textit{R. C. Díaz} et al., Linear Algebra Appl. 577, 168--185 (2019; Zbl 1416.05170) Full Text: DOI
Cardoso, Domingos M.; Díaz, Roberto C.; Rojo, Oscar Distance matrices on the H-join of graphs: a general result and applications. (English) Zbl 1401.05179 Linear Algebra Appl. 559, 34-53 (2018). MSC: 05C50 05C76 05C35 15A18 PDFBibTeX XMLCite \textit{D. M. Cardoso} et al., Linear Algebra Appl. 559, 34--53 (2018; Zbl 1401.05179) Full Text: DOI
Cardoso, Domingos M.; Pastén, Germain; Rojo, Oscar On the multiplicity of \(\alpha\) as an eigenvalue of \(A_\alpha(G)\) of graphs with pendant vertices. (English) Zbl 1391.05282 Linear Algebra Appl. 552, 52-70 (2018). MSC: 05E30 15A18 05C50 PDFBibTeX XMLCite \textit{D. M. Cardoso} et al., Linear Algebra Appl. 552, 52--70 (2018; Zbl 1391.05282) Full Text: DOI
Nikiforov, Vladimir; Rojo, Oscar On the \(\alpha\)-index of graphs with pendent paths. (English) Zbl 1385.05051 Linear Algebra Appl. 550, 87-104 (2018). MSC: 05C50 05C12 15B48 PDFBibTeX XMLCite \textit{V. Nikiforov} and \textit{O. Rojo}, Linear Algebra Appl. 550, 87--104 (2018; Zbl 1385.05051) Full Text: DOI arXiv
Díaz, Roberto C.; Rojo, Oscar Sharp upper bounds on the distance energies of a graph. (English) Zbl 1390.05124 Linear Algebra Appl. 545, 55-75 (2018). MSC: 05C50 15A42 PDFBibTeX XMLCite \textit{R. C. Díaz} and \textit{O. Rojo}, Linear Algebra Appl. 545, 55--75 (2018; Zbl 1390.05124) Full Text: DOI
Soto, Ricardo L.; Díaz, Roberto C.; Salas, Mario; Rojo, Oscar \(M\)-matrices with prescribed elementary divisors. (English) Zbl 1390.15060 Inverse Probl. 33, No. 9, Article ID 095009, 15 p. (2017). Reviewer: Edgar Pereira (Natal) MSC: 15A29 15B48 PDFBibTeX XMLCite \textit{R. L. Soto} et al., Inverse Probl. 33, No. 9, Article ID 095009, 15 p. (2017; Zbl 1390.15060) Full Text: DOI
Andrade, Enide; Cardoso, Domingos M.; Medina, Luis; Rojo, Oscar Bethe graphs attached to the vertices of a connected graph – a spectral approach. (English) Zbl 1360.05093 Linear Multilinear Algebra 65, No. 4, 857-868 (2017). MSC: 05C50 05C76 15A18 PDFBibTeX XMLCite \textit{E. Andrade} et al., Linear Multilinear Algebra 65, No. 4, 857--868 (2017; Zbl 1360.05093) Full Text: DOI Link
Nikiforov, Vladimir; Pastén, Germain; Rojo, Oscar; Soto, Ricardo L. On the \(A_{\alpha}\)-spectra of trees. (English) Zbl 1357.05089 Linear Algebra Appl. 520, 286-305 (2017). MSC: 05C50 05C05 15A18 PDFBibTeX XMLCite \textit{V. Nikiforov} et al., Linear Algebra Appl. 520, 286--305 (2017; Zbl 1357.05089) Full Text: DOI arXiv
Nikiforov, Vladimir; Rojo, Oscar A note on the positive semidefiniteness of \(A_{\alpha}(G)\). (English) Zbl 1357.05090 Linear Algebra Appl. 519, 156-163 (2017). MSC: 05C50 15A18 PDFBibTeX XMLCite \textit{V. Nikiforov} and \textit{O. Rojo}, Linear Algebra Appl. 519, 156--163 (2017; Zbl 1357.05090) Full Text: DOI arXiv
Cardoso, Domingos M.; Rojo, Oscar Edge perturbation on graphs with clusters: adjacency, Laplacian and signless Laplacian eigenvalues. (English) Zbl 1348.05121 Linear Algebra Appl. 512, 113-128 (2017). MSC: 05C50 05E30 15A18 PDFBibTeX XMLCite \textit{D. M. Cardoso} and \textit{O. Rojo}, Linear Algebra Appl. 512, 113--128 (2017; Zbl 1348.05121) Full Text: DOI
Abreu, Nair; Lenes, Eber; Rojo, Oscar Computing the maximal signless Laplacian index among graphs of prescribed order and diameter. (English) Zbl 1346.05157 Proyecciones 34, No. 4, 379-390 (2015). Reviewer: Mirko Lepović (Kragujevac) MSC: 05C50 05C35 15A18 PDFBibTeX XMLCite \textit{N. Abreu} et al., Proyecciones 34, No. 4, 379--390 (2015; Zbl 1346.05157) Full Text: DOI
Andrade, Enide; Cardoso, Domingos M.; Pastén, Germain; Rojo, Oscar On the Faria’s inequality for the Laplacian and signless Laplacian spectra: a unified approach. (English) Zbl 1307.05136 Linear Algebra Appl. 472, 81-96 (2015). MSC: 05C50 15A18 PDFBibTeX XMLCite \textit{E. Andrade} et al., Linear Algebra Appl. 472, 81--96 (2015; Zbl 1307.05136) Full Text: DOI
Cardoso, Domingos M.; Martins, Enide A.; Robbiano, Maria; Rojo, Oscar Copies of a rooted weighted graph attached to an arbitrary weighted graph and applications. (English) Zbl 1282.05098 Electron. J. Linear Algebra 26, 706-717 (2013). MSC: 05C50 05C22 05B30 15A18 PDFBibTeX XMLCite \textit{D. M. Cardoso} et al., Electron. J. Linear Algebra 26, 706--717 (2013; Zbl 1282.05098) Full Text: DOI Link Link
Rojo, Oscar; Soto, Ricardo L. A new upper bound on the largest normalized Laplacian eigenvalue. (English) Zbl 1283.05168 Oper. Matrices 7, No. 2, 323-332 (2013). Reviewer: Dragan Stevanović (Niš) MSC: 05C50 15A18 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{R. L. Soto}, Oper. Matrices 7, No. 2, 323--332 (2013; Zbl 1283.05168) Full Text: DOI Link
Cardoso, Domingos M.; Martins, Enide A.; Medina, Luís; Rojo, Oscar Spectral results for the dominating induced matching problem. arXiv:1311.2748 Preprint, arXiv:1311.2748 [math.CO] (2013). MSC: 05C50 15A18 BibTeX Cite \textit{D. M. Cardoso} et al., ``Spectral results for the dominating induced matching problem'', Preprint, arXiv:1311.2748 [math.CO] (2013) Full Text: arXiv OA License
Medina, Luis; Rojo, Oscar Eigenvalues of certain weighted graphs joined at their roots having cliques at some levels. (English) Zbl 1243.05154 Linear Algebra Appl. 437, No. 3, 878-898 (2012). MSC: 05C50 05C05 15A42 PDFBibTeX XMLCite \textit{L. Medina} and \textit{O. Rojo}, Linear Algebra Appl. 437, No. 3, 878--898 (2012; Zbl 1243.05154) Full Text: DOI
Collao, Macarena; Pizarro, Pamela; Rojo, Oscar An upper bound on the largest signless Laplacian of an odd unicyclic graph. (English) Zbl 1242.05161 Proyecciones 31, No. 1, 39-49 (2012). MSC: 05C50 15A15 PDFBibTeX XMLCite \textit{M. Collao} et al., Proyecciones 31, No. 1, 39--49 (2012; Zbl 1242.05161) Full Text: DOI
Rojo, Oscar; Robbiano, Maria; Cardoso, Domingos M.; Martins, Enide A. Spectra of weighted rooted graphs having prescribed subgraphs at some levels. (English) Zbl 1227.05187 Electron. J. Linear Algebra 22, 653-671 (2011). MSC: 05C50 15A18 05C22 PDFBibTeX XMLCite \textit{O. Rojo} et al., Electron. J. Linear Algebra 22, 653--671 (2011; Zbl 1227.05187) Full Text: DOI EuDML EMIS Link
Soto, Ricardo L.; Rojo, Oscar; Manzaneda, Cristina B. On nonnegative realization of partitioned spectra. (English) Zbl 1221.15021 Electron. J. Linear Algebra 22, 557-572 (2011). MSC: 15A18 PDFBibTeX XMLCite \textit{R. L. Soto} et al., Electron. J. Linear Algebra 22, 557--572 (2011; Zbl 1221.15021) Full Text: DOI EuDML EMIS Link
Rojo, Oscar; Jiménez, Raúl D. Line graph of combinations of generalized Bethe trees: Eigenvalues and energy. (English) Zbl 1222.05178 Linear Algebra Appl. 435, No. 10, 2402-2419 (2011). MSC: 05C50 05C05 15B48 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{R. D. Jiménez}, Linear Algebra Appl. 435, No. 10, 2402--2419 (2011; Zbl 1222.05178) Full Text: DOI
Abreu, Nair; Rojo, Oscar; Justel, Cláudia The algebraic connectivity for subclasses of caterpillars. (English) Zbl 1265.05346 Appl. Anal. Discrete Math. 4, No. 1, 181-196 (2010). MSC: 05C50 05C40 15B48 05C05 05C38 PDFBibTeX XMLCite \textit{N. Abreu} et al., Appl. Anal. Discrete Math. 4, No. 1, 181--196 (2010; Zbl 1265.05346) Full Text: DOI
Rojo, Oscar; Medina, Luis Spectral characterization of some weighted rooted graphs with cliques. (English) Zbl 1194.05095 Linear Algebra Appl. 433, No. 7, 1388-1409 (2010). MSC: 05C50 05C22 15B48 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{L. Medina}, Linear Algebra Appl. 433, No. 7, 1388--1409 (2010; Zbl 1194.05095) Full Text: DOI Link
Gutman, Ivan; Robbiano, María; Martins, Enide Andrade; Cardoso, Domingos M.; Medina, Luis; Rojo, Oscar Energy of line graphs. (English) Zbl 1194.05137 Linear Algebra Appl. 433, No. 7, 1312-1323 (2010). MSC: 05C76 05C50 15B48 PDFBibTeX XMLCite \textit{I. Gutman} et al., Linear Algebra Appl. 433, No. 7, 1312--1323 (2010; Zbl 1194.05137) Full Text: DOI Link
Rojo, Oscar; Medina, Luis; De Abreu, Nair M. M.; Justel, Claudia Extremal algebraic connectivities of certain caterpillar classes and symmetric caterpillars. (English) Zbl 1189.05105 Electron. J. Linear Algebra 20, 136-157 (2010). MSC: 05C50 15B48 05C05 PDFBibTeX XMLCite \textit{O. Rojo} et al., Electron. J. Linear Algebra 20, 136--157 (2010; Zbl 1189.05105) Full Text: DOI EuDML EMIS Link
Rojo, Oscar; Medina, Luis; Abreu, Nair; Justel, Claudia On the algebraic connectivity of some caterpillars: a sharp upper bound and a total ordering. (English) Zbl 1205.05152 Linear Algebra Appl. 432, No. 2-3, 586-605 (2010). Reviewer: Ambat Vijayakumar (Cochin) MSC: 05C50 15B48 05C05 PDFBibTeX XMLCite \textit{O. Rojo} et al., Linear Algebra Appl. 432, No. 2--3, 586--605 (2010; Zbl 1205.05152) Full Text: DOI
Rojo, Oscar; Medina, Luis Spectra of weighted compound graphs of generalized Bethe trees. (English) Zbl 1176.05035 Electron. J. Linear Algebra 18, 30-57 (2009). MSC: 05C22 05C50 15B48 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{L. Medina}, Electron. J. Linear Algebra 18, 30--57 (2009; Zbl 1176.05035) Full Text: DOI EuDML EMIS Link
Rojo, Oscar Spectra of copies of a generalized Bethe tree attached to any graph. (English) Zbl 1168.05328 Linear Algebra Appl. 431, No. 5-7, 863-882 (2009). MSC: 05C50 15B48 PDFBibTeX XMLCite \textit{O. Rojo}, Linear Algebra Appl. 431, No. 5--7, 863--882 (2009; Zbl 1168.05328) Full Text: DOI
Rojo, Oscar; Soto, Ricardo L. Guo perturbation for symmetric nonnegative circulant matrices. (English) Zbl 1178.15009 Linear Algebra Appl. 431, No. 5-7, 594-607 (2009). Reviewer: C. M. da Fonseca (Coimbra) MSC: 15A18 15A29 15B48 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{R. L. Soto}, Linear Algebra Appl. 431, No. 5--7, 594--607 (2009; Zbl 1178.15009) Full Text: DOI Link
Rojo, Oscar Computing tight upper bounds on the algebraic connectivity of certain graphs. (English) Zbl 1213.05159 Linear Algebra Appl. 430, No. 1, 532-543 (2009). MSC: 05C40 05C50 15B48 05C05 PDFBibTeX XMLCite \textit{O. Rojo}, Linear Algebra Appl. 430, No. 1, 532--543 (2009; Zbl 1213.05159) Full Text: DOI
Rojo, Oscar; Medina, Luis Spectra of generalized Bethe trees attached to a path. (English) Zbl 1194.05094 Linear Algebra Appl. 430, No. 1, 483-503 (2009). MSC: 05C50 05C05 05C40 15A18 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{L. Medina}, Linear Algebra Appl. 430, No. 1, 483--503 (2009; Zbl 1194.05094) Full Text: DOI
Rojo, Oscar A new algebra of Toeplitz-plus-Hankel matrices and applications. (English) Zbl 1142.15304 Comput. Math. Appl. 55, No. 12, 2856-2869 (2008). MSC: 15A30 15B57 PDFBibTeX XMLCite \textit{O. Rojo}, Comput. Math. Appl. 55, No. 12, 2856--2869 (2008; Zbl 1142.15304) Full Text: DOI
Rojo, Oscar Spectra of weighted generalized Bethe trees joined at the root. (English) Zbl 1143.05019 Linear Algebra Appl. 428, No. 11-12, 2961-2979 (2008). MSC: 05C05 05C50 15B48 PDFBibTeX XMLCite \textit{O. Rojo}, Linear Algebra Appl. 428, No. 11--12, 2961--2979 (2008; Zbl 1143.05019) Full Text: DOI Link
Rojo, Oscar New upper bounds on the spectral radius of unicyclic graphs. (English) Zbl 1134.05062 Linear Algebra Appl. 428, No. 4, 754-764 (2008). Reviewer: Dragan Stevanović (Niš) MSC: 05C50 15B48 05C05 PDFBibTeX XMLCite \textit{O. Rojo}, Linear Algebra Appl. 428, No. 4, 754--764 (2008; Zbl 1134.05062) Full Text: DOI Link
Soto, Ricardo L.; Rojo, Oscar; Moro, Julio; Borobia, Alberto Symmetric nonnegative realization of spectra. (English) Zbl 1155.15010 Electron. J. Linear Algebra 16, 1-18 (2007). Reviewer: Valeriu Prepeliţă (Bucureşti) MSC: 15A18 15B57 15A29 15B48 PDFBibTeX XMLCite \textit{R. L. Soto} et al., Electron. J. Linear Algebra 16, 1--18 (2007; Zbl 1155.15010) Full Text: DOI EuDML Link
Rojo, Oscar; Robbiano, María An explicit formula for eigenvalues of Bethe trees and upper bounds on the largest eigenvalue of any tree. (English) Zbl 1126.05069 Linear Algebra Appl. 427, No. 1, 138-150 (2007). Reviewer: Juan Ramon Torregrosa Sanchez (Valencia) MSC: 05C50 05C05 15A18 15B48 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{M. Robbiano}, Linear Algebra Appl. 427, No. 1, 138--150 (2007; Zbl 1126.05069) Full Text: DOI
Rojo, Oscar On the \(s\)th Laplacian eigenvalue of trees of order \(st+1\). (English) Zbl 1122.05061 Linear Algebra Appl. 425, No. 1, 143-149 (2007). Reviewer: Juan Ramon Torregrosa Sanchez (Valencia) MSC: 05C50 15A18 15B36 PDFBibTeX XMLCite \textit{O. Rojo}, Linear Algebra Appl. 425, No. 1, 143--149 (2007; Zbl 1122.05061) Full Text: DOI
Gladwell, G. M. L.; Rojo, Oscar Isospectral flows preserving some centrosymmetric structures. (English) Zbl 1117.05076 Linear Algebra Appl. 422, No. 2-3, 839-853 (2007). MSC: 05C50 15B57 65F30 PDFBibTeX XMLCite \textit{G. M. L. Gladwell} and \textit{O. Rojo}, Linear Algebra Appl. 422, No. 2--3, 839--853 (2007; Zbl 1117.05076) Full Text: DOI
Gladwell, G. M. L.; Rojo, Oscar Isospectral flows that preserve matrix structure. (English) Zbl 1111.15012 Linear Algebra Appl. 421, No. 1, 85-96 (2007). Reviewer: C. M. da Fonseca (Coimbra) MSC: 15A18 15A24 15A29 15A90 PDFBibTeX XMLCite \textit{G. M. L. Gladwell} and \textit{O. Rojo}, Linear Algebra Appl. 421, No. 1, 85--96 (2007; Zbl 1111.15012) Full Text: DOI
Rojo, Oscar A nontrivial upper bound on the largest Laplacian eigenvalue of weighted graphs. (English) Zbl 1110.05062 Linear Algebra Appl. 420, No. 2-3, 625-633 (2007). Reviewer: Juan Ramon Torregrosa Sanchez (Valencia) MSC: 05C50 15A18 PDFBibTeX XMLCite \textit{O. Rojo}, Linear Algebra Appl. 420, No. 2--3, 625--633 (2007; Zbl 1110.05062) Full Text: DOI
Rojo, Oscar The spectra of a graph obtained from copies of a generalized Bethe tree. (English) Zbl 1111.05063 Linear Algebra Appl. 420, No. 2-3, 490-507 (2007). Reviewer: Vladimír Lacko (Košice) MSC: 05C50 15B48 PDFBibTeX XMLCite \textit{O. Rojo}, Linear Algebra Appl. 420, No. 2--3, 490--507 (2007; Zbl 1111.05063) Full Text: DOI
Rojo, Oscar; Robbiano, María On the spectra of some weighted rooted trees and applications. (English) Zbl 1107.05061 Linear Algebra Appl. 420, No. 2-3, 310-328 (2007). Reviewer: László A. Székely (Columbia) MSC: 05C50 05C05 15B48 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{M. Robbiano}, Linear Algebra Appl. 420, No. 2--3, 310--328 (2007; Zbl 1107.05061) Full Text: DOI
Rojo, Oscar; Medina, Luis Tight bounds on the algebraic connectivity of Bethe trees. (English) Zbl 1107.05026 Linear Algebra Appl. 418, No. 2-3, 840-853 (2006). Reviewer: László A. Székely (Columbia) MSC: 05C05 05C50 15B48 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{L. Medina}, Linear Algebra Appl. 418, No. 2--3, 840--853 (2006; Zbl 1107.05026) Full Text: DOI
Soto, Ricardo L.; Rojo, Oscar Applications of a Brauer theorem in the nonnegative inverse eigenvalue problem. (English) Zbl 1097.15014 Linear Algebra Appl. 416, No. 2-3, 844-856 (2006). Reviewer: C. M. da Fonseca (Coimbra) MSC: 15A18 15A29 15B48 65F18 PDFBibTeX XMLCite \textit{R. L. Soto} and \textit{O. Rojo}, Linear Algebra Appl. 416, No. 2--3, 844--856 (2006; Zbl 1097.15014) Full Text: DOI
Rojo, Oscar On the spectra of certain rooted trees. (English) Zbl 1092.05048 Linear Algebra Appl. 414, No. 1, 218-243 (2006). Reviewer: Dragan Stevanović (Niš) MSC: 05C50 15B48 05C05 PDFBibTeX XMLCite \textit{O. Rojo}, Linear Algebra Appl. 414, No. 1, 218--243 (2006; Zbl 1092.05048) Full Text: DOI
Rojo, Oscar The spectra of some trees and bounds for the largest eigenvalue of any tree. (English) Zbl 1092.05047 Linear Algebra Appl. 414, No. 1, 199-217 (2006). Reviewer: Dragan Stevanović (Niš) MSC: 05C50 05C05 15B48 PDFBibTeX XMLCite \textit{O. Rojo}, Linear Algebra Appl. 414, No. 1, 199--217 (2006; Zbl 1092.05047) Full Text: DOI
Rojo, Oscar; Soto, Ricardo The spectra of the adjacency matrix and Laplacian matrix for some balanced trees. (English) Zbl 1069.05047 Linear Algebra Appl. 403, 97-117 (2005). Reviewer: Dragan Stevanović (Niš) MSC: 05C50 15B48 05C05 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{R. Soto}, Linear Algebra Appl. 403, 97--117 (2005; Zbl 1069.05047) Full Text: DOI Link
Rojo, Oscar Improved bounds for the largest eigenvalue of trees. (English) Zbl 1069.05046 Linear Algebra Appl. 404, 297-304 (2005). Reviewer: Dragan Stevanović (Niš) MSC: 05C50 05C05 15B48 PDFBibTeX XMLCite \textit{O. Rojo}, Linear Algebra Appl. 404, 297--304 (2005; Zbl 1069.05046) Full Text: DOI
Rojo, Oscar; Rojo, Héctor Some results on symmetric circulant matrices and on symmetric centrosymmetric matrices. (English) Zbl 1063.15006 Linear Algebra Appl. 392, 211-233 (2004). Reviewer: Ralf Gramlich (Darmstadt) MSC: 15A18 65F15 15B48 15A29 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{H. Rojo}, Linear Algebra Appl. 392, 211--233 (2004; Zbl 1063.15006) Full Text: DOI Link
Rojo, O.; Rojo, H. Constructing symmetric nonnegative matrices via the fast Fourier transform. (English) Zbl 1052.65028 Comput. Math. Appl. 45, No. 10-11, 1655-1672 (2003). Reviewer: Daniel Kressner (Berlin) MSC: 65F18 15A18 65T50 15A29 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{H. Rojo}, Comput. Math. Appl. 45, No. 10--11, 1655--1672 (2003; Zbl 1052.65028) Full Text: DOI
Rojo, Oscar; Soto, Ricardo L. Existence and construction of nonnegative matrices with complex spectrum. (English) Zbl 1031.15017 Linear Algebra Appl. 368, 53-69 (2003). Reviewer: Hans Havlicek (Wien) MSC: 15A29 15A18 15B48 15B51 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{R. L. Soto}, Linear Algebra Appl. 368, 53--69 (2003; Zbl 1031.15017) Full Text: DOI
Rojo, Oscar; Peña, Matilde A note on the integer eigenvalues of the Laplacian matrix of a balanced binary tree. (English) Zbl 1057.05056 Linear Algebra Appl. 362, 293-300 (2003). MSC: 05C50 15B48 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{M. Peña}, Linear Algebra Appl. 362, 293--300 (2003; Zbl 1057.05056) Full Text: DOI
Rojo, Oscar The spectrum of the Laplacian matrix of a balanced binary tree. (English) Zbl 0995.05093 Linear Algebra Appl. 349, No. 1-3, 203-219 (2002). Reviewer: Dragan Stevanović (Niš) MSC: 05C50 05C05 15A18 PDFBibTeX XMLCite \textit{O. Rojo}, Linear Algebra Appl. 349, No. 1--3, 203--219 (2002; Zbl 0995.05093) Full Text: DOI
Rojo, O.; Soto, R.; Rojo, H. Bounds for sums of eigenvalues and applications. (English) Zbl 0957.15013 Comput. Math. Appl. 39, No. 7-8, 1-15 (2000). Reviewer: Grosio Stanilov (Sofia) MSC: 15A42 15B51 05C50 05C40 15B48 PDFBibTeX XMLCite \textit{O. Rojo} et al., Comput. Math. Appl. 39, No. 7--8, 1--15 (2000; Zbl 0957.15013) Full Text: DOI
Rojo, H.; Rojo, O.; Soto, R. Related bounds for the extreme eigenvalues. (English) Zbl 0947.15013 Comput. Math. Appl. 38, No. 7-8, 229-242 (1999). Reviewer: Nicolae Cotfas (Bucureşti) MSC: 15A42 15B51 65F15 PDFBibTeX XMLCite \textit{H. Rojo} et al., Comput. Math. Appl. 38, No. 7--8, 229--242 (1999; Zbl 0947.15013) Full Text: DOI
Rojo, O. Further bounds for the smallest singular value and the spectral condition number. (English) Zbl 0947.15012 Comput. Math. Appl. 38, No. 7-8, 215-228 (1999). Reviewer: Nicolae Cotfas (Bucureşti) MSC: 15A42 15A12 65F35 PDFBibTeX XMLCite \textit{O. Rojo}, Comput. Math. Appl. 38, No. 7--8, 215--228 (1999; Zbl 0947.15012) Full Text: DOI
Rojo, O.; Soto, R.; Rojo, H. Bounds for the spectral radius and the largest singular value. (English) Zbl 0942.15013 Comput. Math. Appl. 36, No. 1, 41-50 (1998). Reviewer: Z.Dostal (Ostrava) MSC: 15A42 65F15 PDFBibTeX XMLCite \textit{O. Rojo} et al., Comput. Math. Appl. 36, No. 1, 41--50 (1998; Zbl 0942.15013) Full Text: DOI
Rojo, O.; Montaño, E. Some results on h-hypertournament matrices. (English) Zbl 0910.15006 Comput. Math. Appl. 35, No. 4, 89-93 (1998). Reviewer: R.Covaci (Cluj-Napoca) MSC: 15B57 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{E. Montaño}, Comput. Math. Appl. 35, No. 4, 89--93 (1998; Zbl 0910.15006) Full Text: DOI
Rojo, O.; Soto, R. Perron root bounding for nonnegative persymmetric matrices. (English) Zbl 0857.15010 Comput. Math. Appl. 31, No. 12, 69-76 (1996). Reviewer: J.Zemánek (Warszawa) MSC: 15A42 15B48 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{R. Soto}, Comput. Math. Appl. 31, No. 12, 69--76 (1996; Zbl 0857.15010) Full Text: DOI
Rojo, Oscar L.; Soto, Ricardo L. On the solution of a multiplicative inverse eigenvalue problem. (English) Zbl 1082.15500 Proyecciones 15, No. 2, 179-186 (1996). MSC: 15A18 PDFBibTeX XMLCite \textit{O. L. Rojo} and \textit{R. L. Soto}, Proyecciones 15, No. 2, 179--186 (1996; Zbl 1082.15500) Full Text: DOI
Rojo, O.; Soto, R. L.; Avila, T.; Rojo, H. Localization of eigenvalues in elliptic regions. (English) Zbl 0829.15013 Comput. Math. Appl. 29, No. 7, 3-11 (1995). Reviewer: P.Narain (Bombay) MSC: 15A42 PDFBibTeX XMLCite \textit{O. Rojo} et al., Comput. Math. Appl. 29, No. 7, 3--11 (1995; Zbl 0829.15013) Full Text: DOI
Rojo, O.; Jiménez, R. A decreasing sequence of upper bounds for the Perron root. (English) Zbl 0811.65030 Comput. Math. Appl. 28, No. 8, 9-15 (1994). Reviewer: F.Szidarovszky (Tucson) MSC: 65F15 15A42 05C50 15B48 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{R. Jiménez}, Comput. Math. Appl. 28, No. 8, 9--15 (1994; Zbl 0811.65030) Full Text: DOI
Rojo, Oscar; Soto, Ricardo L.; Rojo, Héctor A decreasing sequence of eigenvalue localization regions. (English) Zbl 0816.65020 Linear Algebra Appl. 196, 71-84 (1994). Reviewer: C.Moroşanu (Iaşi) MSC: 65F15 15A42 PDFBibTeX XMLCite \textit{O. Rojo} et al., Linear Algebra Appl. 196, 71--84 (1994; Zbl 0816.65020) Full Text: DOI
Rojo, Oscar; Soto, Ricardo L.; Rojo, Hector New eigenvalue estimates for complex matrices. (English) Zbl 0773.15008 Comput. Math. Appl. 25, No. 3, 91-97 (1993). Reviewer: A.-A.Jafarian (West Haven) MSC: 15A42 PDFBibTeX XMLCite \textit{O. Rojo} et al., Comput. Math. Appl. 25, No. 3, 91--97 (1993; Zbl 0773.15008) Full Text: DOI
Rojo, Óscar; Soto, Ricardo L.; Rojo, Héctor; Tam, Tin Yau Eigenvalue localization for complex matrices. (English) Zbl 1082.15502 Proyecciones 11, No. 1, 11-19 (1992). MSC: 15A18 PDFBibTeX XMLCite \textit{Ó. Rojo} et al., Proyecciones 11, No. 1, 11--19 (1992; Zbl 1082.15502)
Rojo, O.; Soto, R. New conditions for the additive inverse eigenvalue problem for matrices. (English) Zbl 0756.15016 Comput. Math. Appl. 23, No. 11, 41-46 (1992). Reviewer: A.Ruhe (Göteborg) MSC: 15A18 PDFBibTeX XMLCite \textit{O. Rojo} and \textit{R. Soto}, Comput. Math. Appl. 23, No. 11, 41--46 (1992; Zbl 0756.15016) Full Text: DOI
Rojo, Óscar; Soto, Ricardo Conditions for an additive inverse eigenvalue problem. (English) Zbl 1082.15501 Proyecciones 8, No. 16, 1-15 (1989). MSC: 15A18 34A55 34B05 PDFBibTeX XMLCite \textit{Ó. Rojo} and \textit{R. Soto}, Proyecciones 8, No. 16, 1--15 (1989; Zbl 1082.15501)