Nomura algebras of nonsymmetric Hadamard models. (English) Zbl 1245.05012
Summary: We show that the Nomura algebra of the nonsymmetric Hadamard model coincides with the Bose-Mesner algebra of the directed Hadamard graph.
MSC:
| 05B20 | Combinatorial aspects of matrices (incidence, Hadamard, etc.) |
| 05E30 | Association schemes, strongly regular graphs |
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