Showing 2015Show all
2 papers · 1 filter
math.CO2015
Classifying cocyclic Butson Hadamard matrices
Ronan Egan, Dane Flannery, Padraig Ó Catháin
We classify all the cocyclic Butson Hadamard matrices of order over the th roots of unity for an odd prime and . That is, we compile a lis…
math.CO2015
Trades in complex Hadamard matrices
Padraig Ó Catháin, Ian M. Wanless
A trade in a complex Hadamard matrix is a set of entries which can be changed to obtain a different complex Hadamard matrix. We show that in a real Hadamard matrix of order all…