| 0 ≤ i, 1 < i0, 2 < i, 0 < i0, 2 ≤ i, i0 < i, i0 | i, 0 < i, ∀ j. prime(j) ∧ j * j ≤ i → ¬ j | i, ∀ i0. i→n(i0) < i→n(i) → 0 < i0 ∧ 1 < i0 ∧ (∀ j. prime(j) ∧ j * j ≤ i0 → ¬ j | i0) → prime(i0) ⊦ |
⊦ i | j ↔ (∃ i0. i * i0 = j)
0 ≤ i, 1 < i0, 2 < i, 0 < i0, 2 ≤ i, i0 < i, ∃ i1. i0 * i1 = i, 0 < i, ∀ j. prime(j) ∧ j * j ≤ i → ¬ j | i, ∀ i0. i→n(i0) < i→n(i) → 0 < i0 ∧ 1 < i0 ∧ (∀ j. prime(j) ∧ j * j ≤ i0 → ¬ j | i0) → prime(i0) ⊦
Used terms: i, i0