Metacyclic group

In group theory, a metacyclic group is an extension of a cyclic group by a cyclic group. That is, it is a group G for which there is a short exact sequence

$1 \rightarrow K \rightarrow G \rightarrow H \rightarrow 1,\,$

where H and K are cyclic. Equivalently, a metacyclic group is a group G having a cyclic normal subgroup N, such that the quotient G/N is also cyclic.

Properties

Metacyclic groups are both supersolvable and metabelian.

Examples

• Any cyclic group is metacyclic.
• The direct product or semidirect product of two cyclic groups is metacyclic. These include the dihedral groups, the quasidihedral groups, and the dicyclic groups.
• Every finite group of squarefree order is metacyclic.
• More generally every Z-group is metacyclic. A Z-group is a group whose Sylow subgroups are cyclic.

References

• A. L. Shmel'kin (2001), "Metacyclic group", in Hazewinkel, Michiel, Encyclopaedia of Mathematics, Springer, ISBN 978-1556080104, http://eom.springer.de/M/m063550.htm 

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