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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
9
×D
9
and Q=
C
2
Direct product G=N×Q with N=
C
9
×D
9
and Q=
C
2
d
ρ
Label
ID
D
9
×C
18
36
2
D9xC18
324,61
Semidirect products G=N:Q with N=
C
9
×D
9
and Q=
C
2
extension
φ:Q→Out N
d
ρ
Label
ID
(C
9
×D
9
)⋊C
2
=
D
9
2
φ:
C
2
/
C
1
→
C
2
⊆ Out
C
9
×D
9
18
4+
(C9xD9):C2
324,36
×
⋊
ℤ
𝔽
○
≀
ℚ
◁