International Journal of Combinatorics

Volume 2011 (2011), Article ID 101928, 15 pages

http://dx.doi.org/10.1155/2011/101928

## Binary Representations of Regular Graphs

Department of Mathematics, Central Michigan University, Mount Pleasant, MI 48859, USA

Received 17 January 2011; Accepted 2 August 2011

Academic Editor: Hajo Broersma

Copyright © 2011 Yury J. Ionin. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

#### Abstract

For any 2-distance set *n*-dimensional binary Hamming space *n* such that *b* is the order of *m* is the multiplicity of the least eigenvalue of