Abstract:
It is proved that every isomorphism between any two subgroups of a group G retaining the height of the elements in G is extended to an automorphism of the group itself in the class of abelian p-groups without elements of infinite height if and only if G is a closed group with finite Ulam invariants.
This publication is cited in the following 2 articles:
A. R. Chekhlov, “On abelian groups with right-invariant isometries”, Siberian Math. J., 55:3 (2014), 574–577
A. R. Chekhlov, “O pryamykh summakh tsiklicheskikh grupp s invariantnymi monomorfizmami”, Vestn. Tomsk. gos. un-ta. Matem. i mekh., 2013, no. 3(23), 60–65