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Proof step 1 from proof keep-sorted (conclusion)

⊦ zbr.key = zbrar[n0].key ∧ n0 < # zbrar → (sorted(zbrar[n0, zbr], n, m) ↔ sorted(zbrar, n, m))

System applied rule normalize

And obtained the following new goals

Proof step 2:
zbr.key = zbrar[n0].key, n0 < # zbrar ⊦ sorted(zbrar[n0, zbr], n, m) ↔ sorted(zbrar, n, m)

Rule argument

Additional information