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math.CO2016
The number of ideals of containing with given index
Mitsugu Hirasaka, Semin Oh
It is well-known that a connected regular graph is strongly-regular if and only if its adjacency matrix has exactly three eigenvalues. Let denote an integral square matrix and…
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…