Norm (group)

In mathematics, in the field of group theory, the norm of a group is the intersection of the normalizers of all its subgroups. This is also termed the Baer norm, after Reinhold Baer.

The following facts are true for the Baer norm:


 * It is a characteristic subgroup.
 * It contains the center of the group.
 * It is contained inside the second term of the upper central series.
 * It is a Dedekind group, so is either abelian or has a direct factor isomorphic to the quaternion group.
 * If it contains an element of infinite order, then it is equal to the center of the group.