One-to-one disjoint path covers on k-ary n-cubes

  • Authors:
  • Yuan-Kang Shih;Shin-Shin Kao

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

  • Venue:
  • Theoretical Computer Science
  • Year:
  • 2011

Quantified Score

Hi-index 5.23

Visualization

Abstract

The k-ary n-cube, Q"n^k, is one of the most popular interconnection networks. Let n=2 and k=3. It is known that Q"n^k is a nonbipartite (resp. bipartite) graph when k is odd (resp. even). In this paper, we prove that there exist r vertex disjoint paths {P"i|0@?i@?r-1} between any two distinct vertices u and v of Q"n^k when k is odd, and there exist r vertex disjoint paths {R"i|0@?i@?r-1} between any pair of vertices w and b from different partite sets of Q"n^k when k is even, such that @?"i"="0^r^-^1P"i or @?"i"="0^r^-^1R"i covers all vertices of Q"n^k for 1@?r@?2n. In other words, we construct the one-to-one r-disjoint path cover of Q"n^k for any r with 1@?r@?2n. The result is optimal since any vertex in Q"n^k has exactly 2n neighbors.