Extensions 1→N→G→Q→1 with N=C₂ and Q=C₉:D₄

Direct product G=NxQ with N=C₂ and Q=C₉:D₄

		d	ρ	Label	ID
C₂xC₉:D₄		72		C2xC9:D4	144,46

Non-split extensions G=N.Q with N=C₂ and Q=C₉:D₄

extension	φ:Q→Aut N	d	ρ	Label	ID
C₂.₁(C₉:D₄) = Dic₉:C₄	central extension (φ=1)	144		C2.1(C9:D4)	144,12
C₂.₂(C₉:D₄) = D₁₈:C₄	central extension (φ=1)	72		C2.2(C9:D4)	144,14
C₂.₃(C₉:D₄) = C₁₈.D₄	central extension (φ=1)	72		C2.3(C9:D4)	144,19
C₂.₄(C₉:D₄) = D₄.D₉	central stem extension (φ=1)	72	4-	C2.4(C9:D4)	144,15
C₂.₅(C₉:D₄) = D₄:D₉	central stem extension (φ=1)	72	4+	C2.5(C9:D4)	144,16
C₂.₆(C₉:D₄) = C₉:Q₁₆	central stem extension (φ=1)	144	4-	C2.6(C9:D4)	144,17
C₂.₇(C₉:D₄) = Q₈:₂D₉	central stem extension (φ=1)	72	4+	C2.7(C9:D4)	144,18

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