Extensions 1→N→G→Q→1 with N=C₄ and Q=D₉

Direct product G=N×Q with N=C₄ and Q=D₉

		d	ρ	Label	ID
C₄×D₉		36	2	C4xD9	72,5

Semidirect products G=N:Q with N=C₄ and Q=D₉

extension	φ:Q→Aut N	d	ρ	Label	ID
C₄⋊D₉ = D₃₆	φ: D₉/C₉ → C₂ ⊆ Aut C₄	36	2+	C4:D9	72,6

Non-split extensions G=N.Q with N=C₄ and Q=D₉

extension	φ:Q→Aut N	d	ρ	Label	ID
C₄.D₉ = Dic₁₈	φ: D₉/C₉ → C₂ ⊆ Aut C₄	72	2-	C4.D9	72,4
C₄.₂D₉ = C₉⋊C₈	central extension (φ=1)	72	2	C4.2D9	72,1

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Extensions 1→N→G→Q→1 with N=C4 and Q=D9