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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=
D
9
and Q=
C
21
Direct product G=N×Q with N=
D
9
and Q=
C
21
d
ρ
Label
ID
D
9
×C
21
126
2
D9xC21
378,32
Semidirect products G=N:Q with N=
D
9
and Q=
C
21
extension
φ:Q→Out N
d
ρ
Label
ID
D
9
⋊C
21
=
C
7
×C
9
⋊C
6
φ:
C
21
/
C
7
→
C
3
⊆ Out
D
9
63
6
D9:C21
378,35
×
⋊
ℤ
𝔽
○
≀
ℚ
◁