In mathematics, in the realm of group theory, a subgroup of a group is said to be centrally closed if the centralizer of any nonidentity element of the subgroup lies inside the subgroup.
Some facts about centrally closed subgroups:
- Every malnormal subgroup is centrally closed.
- Every Frobenius kernel is centrally closed.
- SA subgroups are precisely the centrally closed Abelian subgroups.
- The trivial subgroup and the whole group are centrally closed.
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