Cocyclic Hadamard matrices and difference sets
The authors explain the connection between (relative) difference sets, cocyclic Hadamard matrices, cocycles, coboundaries and perfect binary arrays. In particular, they mention the interesting conjecture that for any \(t\), cocyclic Hadamard matrices of order \(4t\) exist. The authors show that many of the known families of Hadamard matrices are actually families of cocyclic Hadamard matrices.
scientific article; zbMATH DE number 1436244
scientific article