Proposition 3.4, p. 20 — (η, ψ, γ) is a morphism of E2(H, G) iff there is a unique r : G → H with (35)–(37)

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Proposition 3.4, p. 20 — (η, ψ, γ) is a morphism of E2(H, G) iff there is a unique r : G → H with (35)–(37) · Prove2Me