Groups with finitely many normalizers of non-subnormal subgroups
AbstractIt is proved that a group G has ﬁnitely many normalizers of non-subnormal subgroups if and only if each subgroup of G either is subnormal or has ﬁnitely many conjugates; groups with this latter property have been completely described in . Moreover, groups with ﬁnitely many normalizers of inﬁnite non-subnormal subgroups are described.
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