∀ x0 . x0 ∈ prim4 3 ⟶ ∀ x1 : ο . (x0 = 0 ⟶ x1) ⟶ (x0 = 1 ⟶ x1) ⟶ (x0 = Sing 1 ⟶ x1) ⟶ (x0 = 2 ⟶ x1) ⟶ (x0 = Sing 2 ⟶ x1) ⟶ (x0 = UPair 0 2 ⟶ x1) ⟶ (x0 = UPair 1 2 ⟶ x1) ⟶ (x0 = 3 ⟶ x1) ⟶ x1 |
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