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Proof step 1 from proof prefixn-toset-restr-empty (conclusion)

⊦ ax.toSet | m = ∅ → prefixn(n, ax).toSet | m = ∅

System applied rule normalize

And obtained the following new goals

Proof step 2:
ax.toSet | m = ∅ ⊦ prefixn(n, ax).toSet | m = ∅

Rule argument

Additional information