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math.CO2016
Linked systems of symmetric group divisible designs
Hadi Kharaghani, Sho Suda
We introduce the concept of linked systems of symmetric group divisible designs. The connection with association schemes is established, and as a consequence we obtain an upper bou…
math.CO2016
Unbiased orthogonal designs
Hadi Kharaghani, Sho Suda
The notion of unbiased orthogonal designs is introduced as a generalization among unbiased Hadamard matrices, unbiased weighing matrices and quasi-unbiased weighing matrices. We pr…