| (i ^ j) ^ i0 = i ^ (j * i0), 0 ≤ i0, 0 ≤ i, 0 ≤ j, ~1 ≤ i0, ∀ j1, j, i. i→n(j1) < i→n(i0 +1) → 0 ≤ j1 ∧ 0 ≤ j ∧ 0 ≤ i → (i ^ j) ^ j1 = i ^ (j * j1) ⊦ (i ^ j) ^ i0 * i ^ j = i ^ (j * (i0 + 1)) |
(i ^ j) ^ i0 = i ^ (j * i0), ~1 ≤ i0, 0 ≤ j, 0 ≤ i, 0 ≤ i0, ∀ j1, j, i. i→n(j1) < i→n(i0 +1) → 0 ≤ j1 ∧ 0 ≤ j ∧ 0 ≤ i → (i ^ j) ^ j1 = i ^ (j * j1) ⊦ i ^ (j * i0) * i ^ j = i ^ (j * (i0 + 1))