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International Journal of CombinatoricsVolume 2010 2010, Article ID 767361, 17 pages

Research Article

Department of Mathematics, Faculty of Science, Kuwait University, P.O. Box 5969, Safat-13060, Kuwait

Department of Mathematics, Colorado State University, Fort Collins, CO 80523, USA

Received 20 May 2010; Accepted 29 July 2010

Academic Editor: Laszlo A. Szekely

Copyright © 2010 Abdullah Al-Azemi and Anton Betten. 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.


The 157, 211 triangle-free symmetric configurations are classified and some of theirproperties are examined. We conclude that each such configuration has a blocking set. Furtherproperties like transitivity on lines, self-duality, and self-polarity are discussed.

Autor: Abdullah Al-Azemi and Anton Betten



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