I have to do some (simple?) computations like this with GAP:
GG:=Group((1,2,4,6)(3,5,7,8), (1,3)(2,5)); H:=DirectProduct(DihedralGroup(4),DihedralGroup(4)); IsomorphicSubgroups( GG, H );
The groups are quite small:
but GAP seems very slow in doing computations like this.
Are there a more rapid way to obtain these results?
Thank you, Nicola.