Classification of the Z2Z4-linear Hadamard codes and their automorphism groups

Denis Krotov, Mercè Villanueva

A $Z_2{Z}_4$-linear Hadamard code of length $\alpha +2\beta =2^t$ is a binary Hadamard code which is the Gray map image of a $Z_2{Z}_4$-additive code with $\alpha$ binary coordinates and $\beta$ quaternar…