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Proof step 1 from proof subarray-append-elim-left (conclusion)

# ar0 ≤ n0, n0 + m ≤ # ar0 + # ar1 ⊦ subarray(ar0 + ar1, n0, m) = subarray(ar1, n0 - # ar0, m)

System applied rule normalize

And obtained the following new goals

Proof step 2:
n0 + m ≤ # ar0 + # ar1, # ar0 ≤ n0 ⊦ subarray(ar0 + ar1, n0, m) = subarray(ar1, n0 - # ar0, m)

Rule argument

Additional information