Copyright © 2001 Elsevier Science B.V. All rights reserved.
Longest fault-free paths in star graphs with vertex faults*1
Received 15 December 1997;
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Abstract
The star graph Sn has been recognized as an attractive alternative to the hypercube. Since S1, S2, and S3 have trivial structures, we focus our attention on Sn with n
4 in this paper. Let Fv denote the set of faulty vertices in Sn. We show that when |Fv|
n − 5, Sn with n
6 contains a fault-free path of length n! − 2|Fv|−2 (n! − 2|Fv|−1) between arbitrary two vertices of even (odd) distance. Since Sn is bipartite with two partite sets of equal size, the path is longest for the worst-case scenario. The situation of n
4 and |Fv|>n − 5 is also discussed.
Author Keywords: Bipartite graph; Cayley graph; Fault-tolerant embedding; Graph–theoretic interconnection network; Hamiltonian path; Longest path; Star graph







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