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Vertex-degree function index on oriented graphs
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2025
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Sergio Bermudo
Roberto Cruz
Juan Rada
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Two-Matchings with Respect to the General Sum-Connectivity Index of Trees
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2024
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Roberto Cruz
M TĂșñez LĂłpez
Juan Rada
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A Matrix Approach to Vertex-Degree-Based Topological Indices
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2024
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Roberto Cruz
Carlos Espinal
Juan Rada
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PDF
Chat
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Spectral norm and energy of a digraph with respect to a VDB topological index
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2024
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Carlos Espinal
Juan Monsalve
Juan Rada
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Sombor index and elliptic Sombor index of benzenoid systems
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2024
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Juan Rada
JosĂ© M. RodrıÌguez
José M. Sigarreta
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PDF
Chat
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Graph Energy Change Due to Vertex Deletion
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2024
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Carlos Espinal
Juan Rada
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Optimization Problems for General Elliptic Sombor Index
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2024
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Juan Rada
JosĂ© M. RodrĂguez
José M. Sigarreta
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PDF
Chat
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Optimization Problems for Variable RandiÄ Type Lodeg Index and Other Indices
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2023
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Juan Rada
JosĂ© M. RodrıÌguez
José M. Sigarreta
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On integral Sombor indices
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2023
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Juan Rada
JosĂ© M. RodrıÌguez
José M. Sigarreta
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PDF
Chat
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Extremal graphs with respect to the total-eccentricity index
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2023
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Rashid Farooq
Mehar Ali Malik
Juan Rada
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Extremal values of VDB topological indices over F-benzenoids with equal number of edges
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2023
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Fengwei Li
Qingfang Ye
Juan Rada
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RandiÄ energy of digraphs
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2022
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Roberto Cruz
Juan Monsalve
Juan Rada
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PDF
Chat
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Extremal values of vertex--degree--based topological indices over fluoranthene-type benzenoid systems with equal number of edges
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2022
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Fengwei Li
Qingfang Ye
Juan Rada
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Vertex-degree-based topological indices of oriented trees
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2022
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Sergio Bermudo
Roberto Cruz
Juan Rada
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Hosoya index of VDB-weighted graphs
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2022
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Roberto Cruz
IvĂĄn Gutman
Juan Rada
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PDF
Chat
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Extremal Unicyclic Graphs with Respect to Vertex-Degree-Based Topological Indices
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2022
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Roberto Cruz
Juan Rada
Wilson Sanchez
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Sombor index of directed graphs
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2022
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Roberto Cruz
Juan Monsalve
Juan Rada
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PDF
Chat
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Extremal Graphs for Exponential VDB Indices
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2022
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Roberto Cruz
Juan Rada
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$ k $-domination and total $ k $-domination numbers in catacondensed hexagonal systems
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2022
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Sergio Bermudo
Robinson A. Higuita
Juan Rada
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PDF
Chat
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Energy of a digraph with respect to a VDB topological index
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2022
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Juan Monsalve
Juan Rada
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Computation method of the Hosoya index of primitive coronoid systems
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2022
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Mert Sinan Ăz
Roberto Cruz
Juan Rada
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Anacondensed hexagonal systems
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2021
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Roberto Cruz
Frank Duque
Juan Rada
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A relation between a vertex-degree-based topological index and its energy
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2021
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IvĂĄn Gutman
Juan Monsalve
Juan Rada
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Total eccentricity index of trees with fixed pendent vertices and trees with fixed diameter
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2021
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Rashid Farooq
Shehnaz Akhter
Juan Rada
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PDF
Chat
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Sharp Upper and Lower Bounds of VDB Topological Indices of Digraphs
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2021
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Juan Monsalve
Juan Rada
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Geometric properties of chemical graphs
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2021
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Juan Rada
JosĂ© M. RodrıÌguez
José M. Sigarreta
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Sombor index of trees with at most three branch vertices
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2021
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Roberto Cruz
Juan Rada
José M. Sigarreta
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Orientations of hexagonal chains with extremal values of the RandiÄ index
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2021
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Sergio Bermudo
Juan Monsalve
Juan Rada
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General properties on Sombor indices
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2021
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Juan Rada
JosĂ© M. RodrıÌguez
José M. Sigarreta
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Domination number of catacondensed hexagonal systems
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2021
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Sergio Bermudo
Robinson A. Higuita
Juan Rada
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Extremal values of the Sombor index in unicyclic and bicyclic graphs
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2021
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Roberto Cruz
Juan Rada
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Vertex-degree based topological indices of digraphs
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2021
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Juan Monsalve
Juan Rada
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Lower bounds for the spectral norm of digraphs
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2021
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JazmĂn GarcĂa
Juan Monsalve
Juan Rada
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Sombor index of chemical graphs
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2021
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Roberto Cruz
IvĂĄn Gutman
Juan Rada
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+
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The balanced double star has maximum exponential second Zagreb index
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2021
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Roberto Cruz
Juan Monsalve
Juan Rada
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PDF
Chat
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Weakly discriminating vertex-degree-based topological indices
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2021
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Juan Rada
JosĂ© M. RodrıÌguez
José M. Sigarreta
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Sharp upper bounds of the F-index of unicyclic graphs
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2020
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S. M. Sheikholeslami
Juan Rada
Akbar Jahanbani
R. Khoeilar
L. Shahbazi
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Extremal values of vertexâdegreeâbased topological indices of coronoid systems
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2020
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Roberto Cruz
AndrĂ©s SantamarĂa-Galvis
Juan Rada
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Extremal spectral radius of graphs with rank 4
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2020
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Juan Monsalve
Juan Rada
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Lower bounds for the number of inlets of hexagonal systems
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2020
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Roberto Cruz
Frank Duque
Juan Rada
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Vertex-Degree Based Topological Indices of Graphene
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2020
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Juan Rada
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On the maximal energy among orientations of a tree
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2020
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Juan Rada
Juan Monsalve
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Extremal values of vertex-degree-based topological indices of chemical trees
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2020
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Roberto Cruz
Juan Monsalve
Juan Rada
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Trees with maximum exponential RandiÄ index
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2020
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Roberto Cruz
Juan Monsalve
Juan Rada
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Extremal trees for the RandiÄ index with given domination number
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2020
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Sergio Bermudo
Juan E. Nåpoles Valdés
Juan Rada
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On the characterization of digraphs with given rank
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2019
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Natalia Agudelo
Juan Monsalve
Juan Rada
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Domination in hexagonal chains
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2019
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Sergio Bermudo
Robinson A. Higuita
Juan Rada
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PDF
Chat
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Corrigendum to âComplex adjacency matrix and energy of digraphsâ
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2019
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Mehtab Khan
Rashid Farooq
Juan Rada
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Maximal Augmented Zagreb Index of Trees With at Most Three Branching Vertices
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2019
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Roberto Cruz
Juan Monsalve
Juan Rada
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On spectra and real energy of complex weighted digraphs
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2018
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Mushtaq A. Bhat
S. Pirzada
Juan Rada
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Extremal values of energy over oriented bicyclic graphs
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2018
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Juan Monsalve
Juan Rada
Yongtang Shi
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Extremal benzenoid systems for two modified versions of the RandiÄ index
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2018
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Fengwei Li
Hajo Broersma
Juan Rada
Yuefang Sun
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Upper bound for the trace norm of the Laplacian matrix of a digraph and normally regular digraphs
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2018
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Natalia Agudelo
Juan Rada
Mauricio Rivera
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Oriented bipartite graphs with minimal trace norm
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2018
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Juan Monsalve
Juan Rada
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+
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Lower bounds for the energy of weighted digraphs
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2018
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Mushtaq A. Bhat
Juan Rada
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PDF
Chat
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Extremal values of Merrifield-Simmons index for trees with two branching vertices
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2018
|
Roberto Cruz
Alberto MarĂn
Juan Rada
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The Augmented Zagreb Indices of Fluoranthene-Type Benzenoid Systems
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2017
|
Fengwei Li
Qingfang Ye
Juan Rada
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+
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Energy of matrices
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2017
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Diego Bravo
Florencia CubrĂa
Juan Rada
|
|
+
PDF
Chat
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Ordering catacondensed hexagonal systems with respect to VDB topological indices
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2017
|
Juan Rada
|
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+
PDF
Chat
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On the energy of symmetric matrices and Coulson's integral formula
|
2017
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José Antonio de la Peña
Juan Rada
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+
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Extremal graphs with respect to the total-eccentricity index
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2017
|
Rashid Farooq
Mehar Ali Malik
Juan Rada
|
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+
PDF
Chat
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Energy of strongly connected digraphs whose underlying graph is a cycle
|
2016
|
Juan Monsalve
Juan Rada
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+
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Complex adjacency matrix and energy of digraphs
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2016
|
Mehtab Khan
Rashid Farooq
Juan Rada
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+
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Vertex-degree-based topological indices of hexagonal systems with equal number of edges
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2016
|
Juan Rada
|
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+
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Extremal values of the trace norm over oriented trees
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2016
|
Natalia Agudelo
José Antonio de la Peña
Juan Rada
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+
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Bicyclic digraphs with maximal energy
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2016
|
Juan Monsalve
Juan Rada
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+
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Lower bounds of Nikiforov's energy over digraphs
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2016
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Natalia Agudelo
Juan Rada
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+
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Extremal values of VDB topological indices over catacondensed polyomino systems
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2016
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Roberto Cruz
Juan Rada
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+
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Vertex-degree-based topological indices over starlike trees
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2015
|
Clara Betancur
Roberto Cruz
Juan Rada
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+
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Extremal polyomino chains of VDB topological indices
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2015
|
Roberto Cruz
Juan Rada
|
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+
PDF
Chat
|
Topological indices of Kragujevac trees
|
2014
|
Roberto Cruz
Juan Rada
IvĂĄn Gutman
|
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+
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Extremal values of vertex-degree-based topological indices over graphs
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2014
|
Roberto Cruz
Tatiana PĂ©rez
Juan Rada
|
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+
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Extremal values of vertex-degree-based topological indices over hexagonal systems with fixed number of vertices
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2014
|
Lilia Berrocal
Aurora Olivieri
Juan Rada
|
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+
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Benzenoid Systems with Extremal Vertex-Degree-Based Topological Indices
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2014
|
Juan Rada
Roberto Cruz
IvĂĄn Gutman
Saudi Arabia
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+
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The linear chain as an extremal value of VDB topological indices of polyomino chains
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2014
|
Juan Rada
|
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+
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Wiener index of Eulerian graphs
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2013
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IvĂĄn Gutman
Roberto Cruz
Juan Rada
|
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+
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An upper bound for the energy of radial digraphs
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2013
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Roberto Cruz
HernĂĄn Giraldo
Juan Rada
|
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+
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The energy of directed hexagonal systems
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2013
|
Juan Rada
IvĂĄn Gutman
Roberto Cruz
|
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+
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Vertex-degree-based topological indices of catacondensed hexagonal systems
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2013
|
Juan Rada
Roberto Cruz
IvĂĄn Gutman
|
|
+
PDF
Chat
|
On benzenoid systems with minimal number of inlets
|
2013
|
Roberto Cruz
IvĂĄn Gutman
Juan Rada
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Cotorsion pairs in C(R-Mod)
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2012
|
Diego Bravo
Edgar E. Enochs
Alina Iacob
Overtoun M. G. Jenda
Juan Rada
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Convex Hexagonal Systems and Their Topological Indices
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2012
|
Roberto Cruz
IvĂĄn Gutman
Juan Rada
|
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+
PDF
Chat
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Projective Envelopes of Finitely Generated Modules
|
2011
|
Rafael Parra
Juan Rada
|
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+
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Bounds for the energy of normal digrahs
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2011
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Juan Rada
|
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+
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A lower bound for the spectral radius of a digraph
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2010
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E. GudinÍo
Juan Rada
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+
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Lower bounds for the energy of digraphs
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2009
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Juan Rada
|
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+
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Almost preenvelopes of commutative rings
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2009
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Carlos Arturo Parra Vargas
Rafael Parra
Juan Rada
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+
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A lower bound for the spectral radius of a digraph.
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2009
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E. GudinÍo
Juan Rada
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+
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The McClelland inequality for the energy of digraphs
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2008
|
Juan Rada
|
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+
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Nonderogatory directed windmills
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2008
|
Juan Rada
|
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+
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Retarded regular graphs are regular or semiregular
|
2008
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José Antonio de la Peña
IvĂĄn Gutman
Juan Rada
|
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+
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Energy of digraphs
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2008
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Ismael Peña
Juan Rada
|
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+
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Projective envelopes of finitely generated modules
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2008
|
Rafael Parra
Juan Rada
|
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+
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Estimating the Estrada index
|
2007
|
José Antonio de la Peña
IvĂĄn Gutman
Juan Rada
|
|
+
PDF
Chat
|
Nonderogatory Unicyclic Digraphs
|
2007
|
Diego Bravo
Juan Rada
|
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+
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ON SPECTRAL MOMENTS AND ENERGY OF GRAPHS
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2007
|
Bo Zhou
IvĂĄn Gutman
Juan Rada
Leonel Mendozad
|
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+
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Coalescence of Difans and Diwheels
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2007
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Malaysian Mathematical
Diego Bravo
Juan Rada
|
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+
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On the multiplicity of the eigenvalues of a graph
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2006
|
José Antonio de la Peña
Juan Rada
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+
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Coulson's integral formula for digraphs.
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2006
|
Ismael Peña
Juan Rada
|
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+
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Comparing momenta and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>Ï</mml:mi></mml:math>-electron energy of benzenoid molecules
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2005
|
José Antonio de la Peña
L. Mendoza
Juan Rada
|
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+
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RandiÄ ordering of chemical trees
|
2005
|
Juan Rada
Carlos UzcĂĄtegui
|
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+
PDF
Chat
|
Abelian groups which have trivial absolute coGalois group
|
2005
|
Edgar E. Enochs
Juan Rada
|
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+
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Variation of the Wiener index under tree transformations
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2005
|
Juan Rada
|
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+
PDF
Chat
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The higher-order matching polynomial of a graph
|
2005
|
Oswaldo Araujo
Mario Estrada
Daniel A. Morales
Juan Rada
|
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+
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Energy ordering of catacondensed hexagonal systems
|
2004
|
Juan Rada
|
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+
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Second Order Randic Index of Benzenoid Systems.
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2004
|
Juan Rada
|
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+
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Upper and lower bounds for the energy of bipartite graphs
|
2003
|
Juan Rada
Antonio Tineo
|
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+
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Polygonal chains with minimal energy
|
2003
|
Juan Rada
Antonio Tineo
|
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+
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RandiÄ structure of a graph
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2003
|
Juan Rada
Carlos UzcĂĄtegui
|
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+
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Characteristic polynomial of catacondensed systems
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2003
|
Juan Rada
|
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+
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Higher order connectivity index of starlike trees
|
2002
|
Juan Rada
Oswaldo Araujo
|
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+
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Vertex and Edge Type Relations of Randic Index for Chemical Trees.
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2002
|
Oswaldo Araujo
Juan Rada
|
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+
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Matchings in starlike trees
|
2001
|
IvĂĄn Gutman
Oswaldo Araujo
Juan Rada
|
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+
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RandiÄ Index of Benzenoid Systems and Phenylenes
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2001
|
Juan Rada
Oswaldo Araujo
IvĂĄn Gutman
|
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+
PDF
Chat
|
Reflective subcategories
|
2000
|
Juan Rada
Manuel SaorıÌn
Alberto del Valle
|
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+
PDF
Chat
|
On two open problems about embedding of modules in free modules<sup>â</sup>
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1999
|
Juan Rada
Manuel SaorıÌn
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+
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Rings characterized by (pre)envelopes and (pre)covers of their modules<sup>â</sup>
|
1998
|
Juan Rada
Manuel SaorıÌn
|
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+
PDF
Chat
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On Semiregular Rings whose Finitely Generated Modules Embed in Free Modules
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1997
|
Juan Rada
Manuel SaorıÌn
|