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Some 3-connected 4-edge-critical non-Hamiltonian graphs

✍ Scribed by Yang Yuansheng; Zhao Chengye; Lin Xiaohui; Jiang Yongsong; Hao Xin

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
79 KB
Volume
50
Category
Article
ISSN
0364-9024

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✦ Synopsis

Abstract

Let γ(G) be the domination number of graph G, thus a graph G is k‐edge‐critical if γ (G) = k, and for every nonadjacent pair of vertices u and υ, γ(G + __u__υ) = k−1. In Chapter 16 of the book “Domination in Graphs—Advanced Topics,” D. Sumner cites a conjecture of E. Wojcicka under the form “3‐connected 4‐critical graphs are Hamiltonian and perhaps, in general (i.e., for any k ≥ 4), (k−1)‐connected, k‐edge‐critical graphs are Hamiltonian.” In this paper, we prove that the conjecture is not true for k = 4 by constructing a class of 3‐connected 4‐edge‐critical non‐Hamiltonian graphs. © 2005 Wiley Periodicals, Inc.

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