∀ x0 . nat_p x0 ⟶ ∀ x1 . equip (ordsucc x0) x1 ⟶ (∀ x2 . x2 ∈ x1 ⟶ ordinal x2) ⟶ ∀ x2 : ο . (∀ x3 x4 . equip x0 x3 ⟶ x4 ∈ x1 ⟶ x3 ⊆ x1 ⟶ x3 ⊆ x4 ⟶ x1 = binunion x3 (Sing x4) ⟶ x2) ⟶ x2 |
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