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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
and Q=
C
2
2
Direct product G=N×Q with N=
C
2
and Q=
C
2
2
d
ρ
Label
ID
C
2
3
8
C2^3
8,5
Non-split extensions G=N.Q with N=
C
2
and Q=
C
2
2
extension
φ:Q→Aut N
d
ρ
Label
ID
C
2
.
1
C
2
2
=
D
4
central stem extension (φ=1)
4
2+
C2.1C2^2
8,3
C
2
.
2
C
2
2
=
Q
8
central stem extension (φ=1)
8
2-
C2.2C2^2
8,4
×
⋊
ℤ
𝔽
○
≀
ℚ
◁