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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
7
⋊C
9
Direct product G=N×Q with N=
C
2
2
and Q=
C
7
⋊C
9
d
ρ
Label
ID
C
2
2
×C
7
⋊C
9
252
C2^2xC7:C9
252,9
Semidirect products G=N:Q with N=
C
2
2
and Q=
C
7
⋊C
9
extension
φ:Q→Aut N
d
ρ
Label
ID
C
2
2
⋊(C
7
⋊C
9
) =
C
21
.A
4
φ:
C
7
⋊C
9
/
C
21
→
C
3
⊆ Aut
C
2
2
126
3
C2^2:(C7:C9)
252,11
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