Volume 4 (2020)

Research Articles

Bounds on Graph Energy
Ivan Gutman, Mohammad Reza Oboudi
Pages: 1-4

Rado Numbers of Regular Nonhomogeneous Equations
Thotsaporn Thanatipanonda
Pages: 5-10

Maximal Hyper-Zagreb Index of Trees, Unicyclic and Bicyclic Graphs With a Given Order and Matching Number
Hechao Liu, Zikai Tang
Pages: 11-18

Seymour’s Second Neighborhood Conjecture for Some Oriented Graphs With no Sink
Moussa Daamouch
Pages: 19-22

On a Conjecture Involving the Second Largest Signless Laplacian Eigenvalue and the Index of Graphs
Enkhbayar Azjargal, Damchaa Adiyanyam, Batmend Horoldagva
Pages: 23-26

Domination Number and Traceability of Graphs
Rao Li
Pages: 27–30

On Subset Sums of Pseudo–Recursive Sequences
Bence Bakos, Norbert Hegyvári, Máté Pálfy, Xiao-Hui Yan
Pages: 31-36

On the Minimum Edge–Szeged Index of Fully–Loaded Unicyclic Graphs
Hechao Liu, Zhengping Qiu, Wenhao Hong, Zikai Tang
Pages: 37-41

Statistics on Bargraphs of Inversion Sequences of Permutations
Toufik Mansour, Mark Shattuck
Pages: 42–49

On Complementary Equienergetic Strongly Regular Graphs
Harishchandra S. Ramane, K. Ashoka, Bolle Parvathalu, Daneshwari Patil, Ivan Gutman
Pages: 50-55

Average Length of the Longest Increasing Subsequences in Random Involutions Avoiding 231 and a Layered Pattern
Toufik Mansour, Chunwei Song
Pages: 56-59

Review Article

Results on Hyperbolicity in Graphs: A Survey
Juan C. Hernández, Gerardo Reyna, Omar Rosario
Pages: 60-72