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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…
math.CO2018
A polynomial ideal associated to any - design
William J. Martin, Douglas R. Stinson
We consider ordered pairs where is a finite set of size and is some collection of -element subsets of such that every -element sub…