| 2 ≤ n, ∀ n0. n0 < n → 2 ≤ n0 → prime(n0) ∨ (∃ m. m | n0 ∧ prime(m) ∧ m * m ≤ n0) ⊦ prime(n), ∃ m. m | n ∧ prime(m) ∧ m * m ≤ n |
2 ≤ n, ∀ n0. n0 < n → 2 ≤ n0 → prime(n0) ∨ (∃ m. m | n0 ∧ prime(m) ∧ m * m ≤ n0) ⊦ prime(n), ∃ m. m | n ∧ prime(m) ∧ m * m ≤ n