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Proof step 4 from proof copy2append00 (previous step)

# ar0 = n0 + n, n ≤ # ar0, n ≤ # ar1 ⊦ copy(ar1, 0, ar0, 0, n) = subarray(ar1, 0, n) + subarray(ar0, n, n0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
# ar0 = n0 + n, n ≤ # ar1 ⊦ copy(ar1, 0, ar0, 0, n) = subarray(ar1, 0, n) + subarray(ar0, n, n0)

Rule argument

Additional information

Used simplifier rules: c: ⊦ m + n = n + m; from specification nat-basic%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic% ⊦ m ≤ m + n; (s)