∀ x0 . ∀ x1 : ι → ι . (∀ x2 . x2 ∈ prim4 x0 ⟶ x1 x2 ∈ prim4 x0) ⟶ (∀ x2 . x2 ∈ prim4 x0 ⟶ ∀ x3 . x3 ∈ prim4 x0 ⟶ x2 ⊆ x3 ⟶ x1 x2 ⊆ x1 x3) ⟶ ∀ x2 : ο . (∀ x3 . and (x3 ∈ prim4 x0) (x1 x3 = x3) ⟶ x2) ⟶ x2 |
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