Disjoint cycles in hypercubes with prescribed vertices in each cycle

  • Authors:
  • Cheng-Kuan Lin;Jimmy J. M. Tan;Lih-Hsing Hsu;Tzu-Liang Kung

  • Affiliations:
  • -;-;-;-

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2013

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Abstract

A graph G is spanning r-cyclable of order t if for any r nonempty mutually disjoint vertex subsets A"1,A"2,...,A"r of G with |A"1@?A"2@?...@?A"r|@?t, there exist r disjoint cycles C"1,C"2,...,C"r of G such that C"1@?C"2@?...@?C"r spans G, and C"i contains A"i for every i. In this paper, we prove that the n-dimensional hypercube Q"n is spanning 2-cyclable of order n-1 for n=3. Moreover, Q"n is spanning k-cyclable of order k if k@?n-1 for n=2. The spanning r-cyclability of a graph G is the maximum integer t such that G is spanning r-cyclable of order k for k=r,r+1,...,t but is not spanning r-cyclable of order t+1. We also show that the spanning 2-cyclability of Q"n is n-1 for n=3.