Finite Group DatabasebetaFinite Group DatabasebetaOrder 40.
8 conjugacy classes of subgroups.
| # | subgroup | G/H | class size | multiplicity | normal? | properties |
|---|---|---|---|---|---|---|
| 1 | C4×C5 | C2 | 1 | 1 | yes | maximal, characteristic |
| 2 | C2×C5 | C4 | 1 | 1 | yes | characteristic |
| 3 | C8 | — | 5 | 1 | no | maximal, Sylow |
| 4 | C5 | C8 | 1 | 1 | yes | characteristic, complemented, Sylow |
| 5 | C4 | D5 | 1 | 1 | yes | characteristic |
| 6 | C2 | Dic5 | 1 | 1 | yes | characteristic |
| subgroup | G/H | |
|---|---|---|
| center, Frattini, hypercenter | C4 | D5 |
| commutator, hypocenter | C5 | C8 |
| Fitting, cosocle | C4×C5 | C2 |
| socle, prime radical | C2×C5 | C4 |
| LCS | G ▷ C5 | |
| UCS | C1 ◁ C4 | |
Splittings G = N ⋊ H with N normal; H ≅ G/N.
| N | H ≅ G/N | type |
|---|---|---|
| 4. C5 | C8 | semidirect |
By isomorphism type — maximal subgroups of the same type appear once, whether or not they are normal.
| subgroup | index |
|---|---|
| C4×C5 | 2 |
| C8 | 5 |