⊦ prime(j) → (i | j ↔ abs(i) = j ∨ abs(i) = 1)
1 < i0, 0 < i0, prime(i), prime(j), i0 | i, abs(i0) = j ∨ abs(i0) = 1 ⊦ i = j
Used terms: j, i0