The 3-class association schemes connected with checkered Hadamard matrices of order 16
3-class association schemes with adjacency matrices \(D_0\), \(D_1\), \(D_2\) and \(D_3\) are considered where \(D_0+ D_3= I_4\otimes J_4\) and \(H= D_0+ D_1- D_2+ D_3\) is a checkered Hadamard matrix (\(\otimes\) denotes the Kronecker product of matrices).
scientific article; zbMATH DE number 1538571