Article
Cycles, the Degree Distance, and the Wiener Index
Open Journal of Discrete Mathematics
Document Type
Article
Publication Date
10-1-2012
DOI
10.4236/ojdm.2012.24031
Disciplines
- Education and
- Mathematics
Abstract
The degree distance of a graph G is D'(G)=(1/2)∑ni=1∑nj=1(di+dj)Li ,j, where di and dj are the degrees of vertices vi, vj ∈ V (G), and Li,j is the distance between them. The Wiener index is defined as W(G)=(1/2)∑ni=1 ∑nj-1Li, j. An elegant result (Gutman; Klein, Mihalic, Plavsic and Trinajstic) is known regarding their correlation, that D'(T)=4W(T)-n(n-1)for a tree T with n vertices. In this note, we extend this study for more general graphs that have frequent appearances in the study of these indices. In particular, we develop a formula regarding their correlation, with an error term that is presented with explicit formula as well as sharp bounds for unicyclic graphs and cacti with given parameters.
Citation Information
Daniel Gray and Hua Wang. "Cycles, the Degree Distance, and the Wiener Index" Open Journal of Discrete Mathematics Vol. 2 Iss. 4 (2012) p. 156 - 159 ISSN: 2161-7643 Available at: http://works.bepress.com/hua_wang/66/
Article under the Creative Commons license "Attribution" (CC BY). Article obtained from the Open Journal of Discrete Mathematics.