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Proof step 1 from proof look-subrange (conclusion)

n < nused ∧ nused ≤ # zbrar ⊦ look(bv, key, adr, key-range(zbrar, n, nused, ri)) ↔ (key ∈ key-range(zbrar, n, nused, ri) ⊃ look(bv, key, adr, ri);¬ bv)

System applied rule normalize

And obtained the following new goals

Proof step 2:
n < nused, nused ≤ # zbrar ⊦ look(bv, key, adr, key-range(zbrar, n, nused, ri)) ↔ (key ∈ key-range(zbrar, n, nused, ri) ⊃ look(bv, key, adr, ri);¬ bv)

Proof step 1 from proof look-subrange (conclusion)

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information