Complex Hadamard matrices attached to a 3-class nonsymmetric association scheme
classification
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complexhadamardmatricesalgebraassociationbose-mesnerclasscontained
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In this paper we classify complex Hadamard matrices contained in the Bose-Mesner algebra of nonsymmetric 3-class association schemes. As a consequence of our classification, we have two infinite families and some small examples of complex Hadamard matrices contained in the Bose-Mesner algebra of a self-dual fission of a complete multipartite graph.
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