… The behaviour of normalizer subgroups of a group has often a strong influence on the
structure of the group itself. In this paper groups with finitely many normalizers of subgroups
with a given property χ are investigated, for various relevant choices of the property χ. … As
a contribution to the theory of groups with few non-subnormal subgroups, in this section we
will describe groups with finitely many normalizers of non-subnormal subgroups; it turns out
that such groups coincide with those in which every subgroup either is subnormal or has …