A note on automorphisms of free nilpotent groups
arXiv:math/0602200
Abstract
We exhibit normal subgroups of a free nilpotent group F of rank two and class three, which have isomorphic finite quotients but are not conjugate under any automorphism of F.
4 pages, to be published in Boll. Unione Mat. Ital. Sez. B Artic. Ric. Mat