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Proof step 1 from proof valid-idx-remlast (conclusion)

⊦ valid-idx(kar, ar, m + 1) ∧ kar[m] = key-index(key, n) → valid-idx(kar[0, key-index(key, n)], ar[n, ar[n].idx:= 0], m)

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information