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Proof step 1 from proof subarray-write-below (conclusion)

n < n0 ⊦ subarray(ar[n, a], n0, n1) = subarray(ar, n0, n1)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
n < n0 ⊦ copy(ar[n, a], n0, mkarray(n1), 0, n1) = copy(ar, n0, mkarray(n1), 0, n1), n0 = 0

Rule argument

Additional information

Used simplifier rules: Subarray: ⊦ subarray(ar, m, n) = copy(ar, m, mkarray(n), 0, n);%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic1