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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
4
and Q=
C
2
Direct product G=N×Q with N=
C
4
and Q=
C
2
d
ρ
Label
ID
C
2
×C
4
8
C2xC4
8,2
Semidirect products G=N:Q with N=
C
4
and Q=
C
2
extension
φ:Q→Aut N
d
ρ
Label
ID
C
4
⋊C
2
=
D
4
φ:
C
2
/
C
1
→
C
2
⊆ Aut
C
4
4
2+
C4:C2
8,3
Non-split extensions G=N.Q with N=
C
4
and Q=
C
2
extension
φ:Q→Aut N
d
ρ
Label
ID
C
4
.C
2
=
Q
8
φ:
C
2
/
C
1
→
C
2
⊆ Aut
C
4
8
2-
C4.C2
8,4
×
⋊
ℤ
𝔽
○
≀
ℚ
◁