| # ar0 = # ar2, # ar1 = # ar2, m < # ar2, ∀ m. m < # ar2 ∧ m ≠ n → ar0[m] = ar1[m], m < # ar2 ∧ m ≠ n → ar1[m] = ar2[m], ∀ m. m < # ar2 ∧ m ≠ n → ar1[m] = ar2[m] ⊦ # ar2 = 0, m = n, ar0[m] = ar2[m] |
# ar0 = # ar2, # ar1 = # ar2, ar1[m] = ar2[m], m < # ar2, ∀ m. m < # ar2 ∧ m ≠ n → ar1[m] = ar2[m], ∀ m. m < # ar2 ∧ m ≠ n → ar0[m] = ar1[m] ⊦ # ar2 = 0, m = n, ar0[m] = ar2[m]