Hamiltonian cycles with all small even chords

Guantao Chen, Katsuhiro Ota, Akira Saito, Yi Zhao

Research output: Contribution to journalArticle

Abstract

Let G be a graph of order n<3. An even squared Hamiltonian cycle (ESHC) of G is a Hamiltonian cycle C= v1v2... vn v1 of G with chords vivi+ 3 for all 1≤i≤n (where vn+ j= vj for j<1). When n is even, an ESHC contains all bipartite 2-regular graphs of order n. We prove that there is a positive integer N such that for every graph G of even order n<N, if the minimum degree is δ(G)<n2+92, then G contains an ESHC. We show that the condition of n being even cannot be dropped and the constant 92 cannot be replaced by 1. Our results can be easily extended to even kth powered Hamiltonian cycles for all k<2.

Original languageEnglish
Pages (from-to)1226-1240
Number of pages15
JournalDiscrete Mathematics
Volume312
Issue number6
DOIs
Publication statusPublished - 2012 Mar 28

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Keywords

  • Dirac theorem
  • Hamiltonian cycle
  • Posa's conjecture

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Discrete Mathematics and Combinatorics

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