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Theoretical Computer Science
Volume 262, Issues 1-2, 6 July 2001, Pages 215-227
 
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doi:10.1016/S0304-3975(00)00190-0    How to Cite or Link Using DOI (Opens New Window)
Copyright © 2001 Elsevier Science B.V. All rights reserved.

Longest fault-free paths in star graphs with vertex faults*1

Sun-Yuan Hsieha, Gen-Huey ChenCorresponding Author Contact Information, E-mail The Corresponding Author, a and Chin-Wen Hob

a Department of Computer Science and Information Engineering, National Chi Nan University, Nantou, Taiwan b Department of Computer Science and Information Engineering, National Central University, Chung-Li, Taiwan

Received 15 December 1997;
revised 15 February 2000;
accepted 27 April 2000.
Communicated by D.-Z. Du.
Available online 15 June 2001.

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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 ngreater-or-equal, slanted4 in this paper. Let Fv denote the set of faulty vertices in Sn. We show that when |Fv|less-than-or-equals, slantn − 5, Sn with ngreater-or-equal, slanted6 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 ngreater-or-equal, slanted4 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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