On the enhanced hyper-hamiltonian laceability of hypercubes

  • Authors:
  • Tsung-Han Tsai;Tzu-Liang Kung;Jimmy J. M. Tan;Lih-Hsing Hsu

  • Affiliations:
  • National Chiao Tung University, Department of Computer Science, Hsinchu, Taiwan;National Chiao Tung University, Department of Computer Science, Hsinchu, Taiwan;National Chiao Tung University, Department of Computer Science, Hsinchu, Taiwan;Providence University, Department of Computer Science and Information Engineering, Taichung, Taiwan

  • Venue:
  • CEA'09 Proceedings of the 3rd WSEAS international conference on Computer engineering and applications
  • Year:
  • 2009

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Abstract

A bipartite graph is hamiltonian laceable if there exists a hamiltonian path between any two vertices that are in different partite sets. A hamiltonian laceable graph G is said to be hyper-hamiltonian laceable if, for any vertex v of G, there exists a hamiltonian path of G - {v} joining any two vertices that are located in the same partite set different from that of v. In this paper, we further improve the hyper-hamiltonian laceability of hypercubes by showing that, for any two vertices x, y from one partite set of Qn, n ≥ 4, and any vertex w from the other partite set, there exists a hamiltonian path H of Qn - {w} joining x to y such that dH(x, z) = l for any vertex z ε V (Qn) - {x,y,w} and for every integer l satisfying both dQn(x, z) ≤ l ≤ 2n - 2 - dQn(z; y) and 2|(l - dQn(x; z)). As a consequence, many attractive properties of hypercubes follow directly from our result.