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math.CO2015★ 1 cited
Hoffman's coclique bound for normal regular digraphs, and nonsymmetric association schemes
Hadi Kharaghani, Sho Suda
We extend Hoffman's coclique bound for regular digraphs with the property that its adjacency matrix is normal, and discuss cocliques attaining the inequality. As a consequence, we…
math.CO2015
Symmetric Bush-type generalized Hadamard matrices and association schemes
Hadi Kharaghani, Sho Suda
We define Bush-type generalized Hadamard matrices over abelian groups and construct symmetric Bush-type generalized Hadamard matrices over the additive group of finite field $\math…