Mutually independent Hamiltonian cycles in alternating group graphs |
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Authors: | Hsun Su Shih-Yan Chen Shin-Shin Kao |
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Affiliation: | 1. Department of Applied Mathematics, Chung Yuan Christian University, Chung-Li City, 32023, Taiwan ROC 2. Department of Public Finance and Taxation, Takming University of Science and Technology, Taipei City, 11451, Taiwan ROC
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Abstract: | The alternating group graph has been used as the underlying topology for many practical multicomputers, and has been extensively studied in the past. In this article, we will show that any alternating group graph AG n , where n??3 is an integer, contains 2n?4 mutually independent Hamiltonian cycles. More specifically, let N=|V(AG n )|, v i ??V(AG n ) for 1??i??N, and ??v 1,v 2,??,v N ,v 1?? be a Hamiltonian cycle of AG n . We show that AG n contains 2n?4 Hamiltonian cycles, denoted by $C_{l}=\langle v_{1},v_{2}^{l},\ldots,v_{N}^{l},v_{1}\rangle$ for 1??l??2n?4, such that $v_{i}^{l} \ne v_{i}^{l'}$ for all 2??i??N whenever l??l??. The result is optimal since each vertex of AG n has exactly 2n?4 neighbors. |
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