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Proof step 1 from proof subarray-emparray (conclusion)

n2 ≤ n1 ⊦ subarray(mkemparray(n0 + n1), n0, n2) = mkemparray(n2)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ mkemparray(n) = fill(mkarray(n), empty)
Proof step 3:
n2 ≤ n1 ⊦ subarray(fill(mkarray(n0 + n1), empty), n0, n2) = fill(mkarray(n2), empty)

Rule argument

Additional information

Used simplifier rules: emparray: ⊦ mkemparray(n) = fill(mkarray(n), empty);