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C
n
D
n
S
n
A
n
Degree
Linear
Irr Reps
Characters
×
⋊
.
○
≀
Extensions
1→N→G→Q→1 with N=
C
2
2
and Q=
C
9
Direct product G=N×Q with N=
C
2
2
and Q=
C
9
d
ρ
Label
ID
C
2
×C
18
36
C2xC18
36,5
Semidirect products G=N:Q with N=
C
2
2
and Q=
C
9
extension
φ:Q→Aut N
d
ρ
Label
ID
C
2
2
⋊C
9
=
C
3
.A
4
φ:
C
9
/
C
3
→
C
3
⊆ Aut
C
2
2
18
3
C2^2:C9
36,3
×
⋊
ℤ
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○
≀
ℚ
◁