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math.CO2016
Association schemes all of whose symmetric fusion schemes are integral
Mitsugu Hirasaka, Kijung Kim, Semin Oh
In this paper we aim to characterize association schemes all of whose symmetric fusion schemes have only integral eigenvalues, and classify those obtained from a regular action of…
math.GR2016
On commutative -schemes of order
Kijung Kim
In this article, we consider the existence and schurity problem on commutative -schemes of order . Using the thin radical and thin residue, we give sufficient conditions fo…