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math.CO2026
Character and Multiplier Obstructions for Circulant Weighing Matrices
Ming Ming Tan
We prove the nonexistence of eight circulant weighing matrices from the remaining table of orders at most and weights at most . The proofs combine contraction, character…
math.CO2016
Group Invariant Weighing Matrices
Ming Ming Tan
We investigate the existence problem of group invariant matrices using algebraic approaches. We extend the usual concept of multipliers to group rings with cyclotomic integers as c…