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Proof step 8 from proof idexcept-extract-right (previous step)

# ar0 = # ar1, n0 < # ar1, ∀ m. m < # ar1 ∧ m ≠ n → ar0[m] = ar1[m] ⊦ n0 = n, # ar1 = 0, ar1[n0] = ar0[n, ar1[n]][n0]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 9:
# ar0 = # ar1, n0 < # ar1, ∀ m. m < # ar1 ∧ m ≠ n → ar0[m] = ar1[m] ⊦ n0 = n, # ar1 = 0, ar1[n0] = ar0[n0]

Rule argument

Additional information

Used simplifier rules: Put-other: ⊦ m ≠ n → ar[n, a][m] = ar[m]; from specification array