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Proof step 14 from proof cut (previous step)

⊦ # ar ≠ 0, ar = [], # ar = (# ar - 1) + 1 ∧ (n < # ar → ar[n] = copy(ar, 1, mkarray((# ar - 1) + 1), 1, # ar - 1)[0, ar[0]][n])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 15:
# ar = 0 ⊦ ar = []

Rule argument

Additional information

Used simplifier rules: c: ⊦ m + n = n + m; from specification nat-basic2%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic2%oz: ⊦ m + 1 ≠ 0; from specification nat-basic2