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Proof step 1 from proof disj-union-rem (conclusion)

m ≤ # asar, n0 ≠ n1, n0 < m, n1 < m ⊦ disj(asar, 0, m) → (asar[n0] ∪ as) \ asar[n1] = asar[n0] ∪ (as \ asar[n1])

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information