| i * i1 = (i1 * i0 + i2 * i0) + j0, 1 < i1 + i2, 0 < i2, 0 < i1, 0 ≤ j0, 0 < i0, j0 < i1 + i2, 0 < j1, 0 < i, i ≤ i0 ⊦ |
⊦ i ≤ j ↔ (∃ i0. j = i + i0 ∧ 0 ≤ i0)
i * i1 = (i1 * i0 + i2 * i0) + j0, 1 < i1 + i2, 0 < i2, 0 < i1, 0 ≤ j0, 0 < i0, j0 < i1 + i2, 0 < j1, 0 < i, ∃ i1. i0 = i + i1 ∧ 0 ≤ i1 ⊦
Used terms: i0, i