Extensions 1→N→G→Q→1 with N=C2 and Q=C2xDic9

Direct product G=NxQ with N=C2 and Q=C2xDic9
dρLabelID
C22xDic9144C2^2xDic9144,45


Non-split extensions G=N.Q with N=C2 and Q=C2xDic9
extensionφ:Q→Aut NdρLabelID
C2.1(C2xDic9) = C2xC9:C8central extension (φ=1)144C2.1(C2xDic9)144,9
C2.2(C2xDic9) = C4xDic9central extension (φ=1)144C2.2(C2xDic9)144,11
C2.3(C2xDic9) = C4.Dic9central stem extension (φ=1)722C2.3(C2xDic9)144,10
C2.4(C2xDic9) = C4:Dic9central stem extension (φ=1)144C2.4(C2xDic9)144,13
C2.5(C2xDic9) = C18.D4central stem extension (φ=1)72C2.5(C2xDic9)144,19

׿
x
:
Z
F
o
wr
Q
<