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Section B

The construction of mutually independent Hamiltonian cycles in bubble-sort graphs

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Pages 2212-2225 | Received 20 Mar 2008, Accepted 04 Sep 2008, Published online: 20 Apr 2010
 

Abstract

A Hamiltonian cycle C=⟨ u 1, u 2, …, u n(G), u 1 ⟩ with n(G)=number of vertices of G, is a cycle C(u 1; G), where u 1 is the beginning and ending vertex and u i is the ith vertex in C and u i u j for any ij, 1≤i, jn(G). A set of Hamiltonian cycles {C 1, C 2, …, C k } of G is mutually independent if any two different Hamiltonian cycles are independent. For a hamiltonian graph G, the mutually independent Hamiltonianicity number of G, denoted by h(G), is the maximum integer k such that for any vertex u of G there exist k-mutually independent Hamiltonian cycles of G starting at u. In this paper, we prove that h(B n )=n−1 if n≥4, where B n is the n-dimensional bubble-sort graph.

2000 AMS Subject Classifications :

Acknowledgements

The authors are grateful to the referees for their thorough reviews of the paper and many helpful suggestions. Jimmy J. M. Tan was partially supported by the National Science Council of the Republic of China under contract NSC 96-2221-E-009-137-MY3 and also by the Aiming for the Top University and Elite Research Center Development Plan.

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