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Characters of association schemes containing a strongly normal closed subset of prime index


Author: Akihide Hanaki
Journal: Proc. Amer. Math. Soc. 135 (2007), 2683-2687
MSC (2000): Primary 05E30
DOI: https://doi.org/10.1090/S0002-9939-07-08835-1
Published electronically: April 5, 2007
MathSciNet review: 2317940
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Abstract: We consider a relation between characters of an association scheme and its strongly normal closed subsets with prime index. As an application of our result, we show that an association scheme of prime square order with a proper strongly normal closed subset is commutative.


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Additional Information

Akihide Hanaki
Affiliation: Faculty of Science, Shinshu University, Matsumoto, 390-8621, Japan
Email: hanaki@math.shinshu-u.ac.jp

DOI: https://doi.org/10.1090/S0002-9939-07-08835-1
Keywords: Association scheme, strongly normal closed subset, character, Clifford theory, group-graded algebra
Received by editor(s): May 10, 2006
Published electronically: April 5, 2007
Communicated by: Jim Haglund
Article copyright: © Copyright 2007 American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.

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