3 papers
math.CO2021
Subtrees and BC-subtrees of maximum degree no more than k in trees
Yu Yang, Xiao-xiao Li, Meng-yuan Jin +3
The subtrees and BC-subtrees (subtrees where any two leaves are at even distance apart) have been extensively studied in recent years. Such structures, under special constraints on…
math.CO2020
The expected subtree number index in random polyphenylene and spiro chains
Yu Yang, Xiao-Jun Sun, Jia-Yi Cao +2
Subtree number index of a graph is the number of nonempty subtrees of . It is a structural and counting based topological index that has received more and mo…
math.CO2016
Maximum atom-bond connectivity index with given graph parameters
Xiu-Mei Zhang, Yu Yang, Hua Wang +1
The atom-bond connectivity (ABC) index is a degree-based topological index. It was introduced due to its applications in modeling the properties of certain molecular structures and…