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math.CO2018★ 4 cited
Spectra of Hadamard matrices
Ronan Egan, Padraig O Cathain, Eric Swartz
A Butson Hadamard matrix has entries in the kth roots of unity, and satisfies the matrix equation . We write for the set of such matrice…
math.CO2018
Construction of the outer automorphism of S6 via a complex Hadamard matrix
Neil Gillespie, Padraig Ó Catháin, Cheryl Praeger
We give a new construction of the outer automorphism of the symmetric group on six points. Our construction features a complex Hadamard matrix of order six containing third roots o…