Mutually independent Hamiltonian cycles in dual-cubes

  • Authors:
  • Yuan-Kang Shih;Hui-Chun Chuang;Shin-Shin Kao;Jimmy J. Tan

  • Affiliations:
  • Department of Computer Science, National Chiao Tung University, Hsinchu, Taiwan, China 30010;Department of Applied Mathematics, Chung-Yuan Christian University, Chung-Li, Taiwan, China 32023;Department of Applied Mathematics, Chung-Yuan Christian University, Chung-Li, Taiwan, China 32023;Department of Computer Science, National Chiao Tung University, Hsinchu, Taiwan, China 30010

  • Venue:
  • The Journal of Supercomputing
  • Year:
  • 2010

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Abstract

The hypercube family Q n is one of the most well-known interconnection networks in parallel computers. With Q n , dual-cube networks, denoted by DC n , was introduced and shown to be a (n+1)-regular, vertex symmetric graph with some fault-tolerant Hamiltonian properties. In addition, DC n 's are shown to be superior to Q n 's in many aspects. In this article, we will prove that the n-dimensional dual-cube DC n contains n+1 mutually independent Hamiltonian cycles for n驴2. More specifically, let v i 驴V(DC n ) for 0驴i驴|V(DC n )|驴1 and let $\langle v_{0},v_{1},\ldots ,v_{|V(\mathit{DC}_{n})|-1},v_{0}\rangle$ be a Hamiltonian cycle of DC n . We prove that DC n contains n+1 Hamiltonian cycles of the form $\langle v_{0},v_{1}^{k},\ldots,v_{|V(\mathit{DC}_{n})|-1}^{k},v_{0}\rangle$ for 0驴k驴n, in which v i k 驴v i k驴 whenever k驴k驴. The result is optimal since each vertex of DC n has only n+1 neighbors.