Extensions 1→N→G→Q→1 with N=C₂² and Q=C₂²

Direct product G=N×Q with N=C₂² and Q=C₂²

		d	ρ	Label	ID
C₂⁴		16		C2^4	16,14

Semidirect products G=N:Q with N=C₂² and Q=C₂²

extension	φ:Q→Aut N	d	ρ	Label	ID
C₂²⋊C₂² = C₂×D₄	φ: C₂²/C₂ → C₂ ⊆ Aut C₂²	8		C2^2:C2^2	16,11

Non-split extensions G=N.Q with N=C₂² and Q=C₂²

extension	φ:Q→Aut N	d	ρ	Label	ID
C₂².C₂² = C₄○D₄	φ: C₂²/C₂ → C₂ ⊆ Aut C₂²	8	2	C2^2.C2^2	16,13
C₂².₂C₂² = C₂²⋊C₄	central extension (φ=1)	8		C2^2.2C2^2	16,3
C₂².₃C₂² = C₄⋊C₄	central extension (φ=1)	16		C2^2.3C2^2	16,4
C₂².₄C₂² = C₂×Q₈	central extension (φ=1)	16		C2^2.4C2^2	16,12

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Extensions 1→N→G→Q→1 with N=C22 and Q=C22