On maximum Wiener index of trees and graphs with given radius

Kinkar Ch. Das () and M. J. Nadjafi-Arani ()
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Kinkar Ch. Das: Sungkyunkwan University
M. J. Nadjafi-Arani: Mahallat Institute of Higher Education

Journal of Combinatorial Optimization, 2017, vol. 34, issue 2, No 19, 574-587

Abstract: Abstract Let G be a connected graph of order n. The long-standing open and close problems in distance graph theory are: what is the Wiener index W(G) or average distance $$\mu (G)$$ μ ( G ) among all graphs of order n with diameter d (radius r)? There are very few number of articles where were worked on the relationship between radius or diameter and Wiener index. In this paper, we give an upper bound on Wiener index of trees and graphs in terms of number of vertices n, radius r, and characterize the extremal graphs. Moreover, from this result we give an upper bound on $$\mu (G)$$ μ ( G ) in terms of order and independence number of graph G. Also we present another upper bound on Wiener index of graphs in terms of number of vertices n, radius r and maximum degree $$\Delta $$ Δ , and characterize the extremal graphs.

Keywords: Graph; Tree; Wiener index; Average distance; Radius; Maximum degree; 05C07 (search for similar items in EconPapers)
Date: 2017
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Citations: View citations in EconPapers (5)

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DOI: 10.1007/s10878-016-0092-y

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