Central subgroup explained

In mathematics, in the field of group theory, a subgroup of a group is termed central if it lies inside the center of the group.

Given a group

G , the center of G , denoted as Z(G) , is defined as the set of those elements of the group which commute with every element of the group. The center is a characteristic subgroup. A subgroup H of G is termed central if H \leq Z(G) .

Central subgroups have the following properties:

• They are abelian groups (because, in particular, all elements of the center must commute with each other).
• They are normal subgroups. They are central factors, and are hence transitively normal subgroups.

References

• .