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DISJOINT CYCLES WITH PRESCRIBED LENGTHS AND INDEPENDENT EDGES IN GRAPHS

  • Wang, Hong (Department of Mathematics The University of Idaho)
  • Received : 2013.05.24
  • Published : 2014.09.01

Abstract

We conjecture that if $k{\geq}2$ is an integer and G is a graph of order n with minimum degree at least (n+2k)/2, then for any k independent edges $e_1$, ${\cdots}$, $e_k$ in G and for any integer partition $n=n_1+{\cdots}+n_k$ with $n_i{\geq}4(1{\leq}i{\leq}k)$, G has k disjoint cycles $C_1$, ${\cdots}$, $C_k$ of orders $n_1$, ${\cdots}$, $n_k$, respectively, such that $C_i$ passes through $e_i$ for all $1{\leq}i{\leq}k$. We show that this conjecture is true for the case k = 2. The minimum degree condition is sharp in general.

Keywords

Acknowledgement

Supported by : NSA

References

  1. S. Abbasi, Spanning cycles in dense graphs, Ph.D. thesis, Rutgers University, 1999.
  2. B. Bollobas, Extremal Graph Theory, Academic Press, London, 1978.
  3. J. Bondy and V. Chvatal, A method in graph theory, Discrete Math. 15 (1976), no. 2, 111-135. https://doi.org/10.1016/0012-365X(76)90078-9
  4. Y. Egawa, R. Faudree, E. Gyori, Y. Ishigami, R. Schelp, and H. Wang, Vertex-disjoint cycles containing specified edges, Graphs Combin. 16 (2000), no. 1, 81-92. https://doi.org/10.1007/s003730050005
  5. M. H. El-Zahar, On circuits in graphs, Discrete Math. 50 (1984), no. 2-3, 227-230. https://doi.org/10.1016/0012-365X(84)90050-5
  6. P. Erdos and T. Gallai, On maximal paths and circuits of graphs, Acta Math. Acad. Sci. Hungar 10 (1959), 337-356.
  7. C. Magnant and K. Ozeki, Partitioning graphs into paths and cycles, J. Comb. 3 (2012), no. 2, 135-161.
  8. H. Wang, Covering a graph with cycles passing through given edges, J. Graph Theory 26 (1997), no. 2, 105-109. https://doi.org/10.1002/(SICI)1097-0118(199710)26:2<105::AID-JGT5>3.0.CO;2-W
  9. J. E.Williamson, Panconnected graph II, Period. Math. Hungar. 8 (1977), no. 2, 105-116. https://doi.org/10.1007/BF02018497

Cited by

  1. Degree Conditions for the Existence of Vertex-Disjoint Cycles and Paths: A Survey vol.34, pp.1, 2018, https://doi.org/10.1007/s00373-017-1873-5