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Non-symmetric class $2$ association schemes obtained by doubling of skew-Hadamard matrices are non-schurian

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abstract

We can obtain a non-symmetric class $2$ association scheme by a skew-Hadamard matrix. We begin with a skew-Hadamard matrix of order $n$, construct a skew-Hadamard matrix of order $2n$ by doubling construction, and a non-symmetric class $2$ association scheme of order $2n-1$. We will show that the association scheme obtained in this way never be schurian if $n$ is greater than or equal to $8$.

fields

cs.CR 1

years

2024 1

verdicts

REJECT 1

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