`BookProof.ChapterPinOmega.Omega_mul_closed` : ∀ x ∈ Omega, ∀ y ∈ Omega, x * y ∈ Omega

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`BookProof.ChapterPinOmega.Omega_mul_closed` : ∀ x ∈ Omega, ∀ y ∈ Omega, x * y ∈ Omega · Prove2Me