∀ x0 . ∀ x1 : ι → ι . (∀ x2 . x2 ∈ x0 ⟶ x1 x2 ∈ x0) ⟶ (∀ x2 . x2 ∈ x0 ⟶ ∀ x3 . x3 ∈ x0 ⟶ x1 x2 = x1 x3 ⟶ x2 = x3) ⟶ (∀ x2 . x2 ∈ x0 ⟶ ∀ x3 : ο . (∀ x4 . and (x4 ∈ x0) (x1 x4 = x2) ⟶ x3) ⟶ x3) ⟶ Permutation (pack_u x0 x1) |
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