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Triangle-Free Graphs with Large Degree

Published online by Cambridge University Press:  01 December 1997

C. C. CHEN
Affiliation:
Department of Mathematics, National University of Singapore, Kent Ridge, Singapore 0511 and Department of Pure Mathematics and Mathematical Statistics, 16 Mill Lane, Cambridge CB2 1SB, UK; (e-mail: G.Jin@dpmms.cam.ac.uk)
G. P. JIN
Affiliation:
Department of Mathematics, National University of Singapore, Kent Ridge, Singapore 0511 and Department of Pure Mathematics and Mathematical Statistics, 16 Mill Lane, Cambridge CB2 1SB, UK; (e-mail: G.Jin@dpmms.cam.ac.uk)
K. M. KOH
Affiliation:
Department of Mathematics, National University of Singapore, Kent Ridge, Singapore 0511 and Department of Pure Mathematics and Mathematical Statistics, 16 Mill Lane, Cambridge CB2 1SB, UK; (e-mail: G.Jin@dpmms.cam.ac.uk)

Abstract

A graph G is called an H-type graph for some graph H if there is a mapping from V(G) to V(H) preserving edges. In this paper, we shall prove that: (1) every triangle-free graph G of order n with χ(G)[les ]3 and δ(G)>n/3 is of Fd-type for some d[ges ]1, where Fd is a certain d-regular triangle-free Hamiltonian Cayley graph of order 3d−1, (2) every triangle-free graph G of order n with χ(G)[ges ]4 and δ(G)>n/3 contains the Mycielski graph (see Figure 2) as a subgraph.

Type
Research Article
Copyright
1997 Cambridge University Press

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