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Discrete Mathematics
Volume 285, Issues 1-3, 6 August 2004, Pages 127-140
 
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doi:10.1016/j.disc.2004.01.014    How to Cite or Link Using DOI (Opens New Window)
Copyright © 2004 Elsevier B.V. All rights reserved.

On the number of cycles in generalized Kautz digraphs

Toru HasunumaE-mail The Corresponding Author, a, 1, Yosuke Kikuchib, Takeshi Moric and Yukio Shibatab

a Department of Computer Science, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan b Department of Computer Science, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan c Kumagaya City Office, 2-47-1 Miyacho, Kumagaya, Saitama 360-0041, Japan

Received 20 February 2003; 
Revised 12 January 2004; 
accepted 14 January 2004. 
Available online 17 June 2004.

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Abstract

In this paper, we count cycles in a generalized Kautz digraph GK(n,d). Let n=pdh such that Image . Also let gl=gcd(dl−(−1)l,n). We show that if one of the following conditions holds:

Image and kless-than-or-equals, slantlogd n+1,
Image and Image ,
d5(d+1)<p and Image
then the number of cycles of length k in GK(n,d) is given by

Image
where μ is the Möbius function.

Author Keywords: Counting; Cycles; Generalized Kautz digraphs; Interconnection networks

Article Outline

1. Introduction
2. Preliminaries
3. The number of nonperiodic closed walks
4. Upper and lower bounds on the twisted girth
5. The number of cycles
6. Concluding remarks
References













Discrete Mathematics
Volume 285, Issues 1-3, 6 August 2004, Pages 127-140
 
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