On 4-equivalenced association schemes
Bull. Korean Math. Soc. 2015 Vol. 52, No. 5, 1683-1709
Printed September 30, 2015
Jeong Rye Park
Pusan National University
Abstract : Let $(\Omega,S)$ be an association scheme where $\Omega$ is a non-empty finite set and $S$ is a partition of $\Omega\times\Omega$. For a positive integer $k$ we say that $(\Omega,S)$ is {\it $k$-equivalenced} if each non-diagonal element of $S$ has valency $k$. In this paper we focus on $4$-equivalenced association schemes, and prove that they are transitive.
Keywords : association schemes, equivalenced, Frobenius, schurian, transitive
MSC numbers : 05E30
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