On a class of wreath products of hypergroups and association schemes |
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Authors: | Rie Tanaka Paul-Hermann Zieschang |
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Institution: | 1. Sendai, Japan 2. Department of Mathematics, University of Texas at Brownsville, Brownsville, TX, 78520, USA
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Abstract: | We characterize finite hypergroups S (in the sense of Frédéric Marty in Huitième Congres des Mathématiciens, pp. 45–59, 1934) satisfying |pq|=1 for any two elements p and q in S with p≠q ? in terms of wreath products. The result applies to association schemes of finite valency and provides a corresponding characterization in scheme theory. For association schemes S of finite valency satisfying the above condition, we provide a second characterization, a characterization in terms of the subconstituent algebra of S. |
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