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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
21
and Q=
S
3
Direct product G=N×Q with N=
D
21
and Q=
S
3
d
ρ
Label
ID
S
3
×D
21
42
4+
S3xD21
252,36
Semidirect products G=N:Q with N=
D
21
and Q=
S
3
extension
φ:Q→Out N
d
ρ
Label
ID
D
21
⋊S
3
=
D
21
⋊S
3
φ:
S
3
/
C
3
→
C
2
⊆ Out
D
21
42
4
D21:S3
252,37
×
⋊
ℤ
𝔽
○
≀
ℚ
◁