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Proof step 1 from proof uniquelen (conclusion)

∀ a. a ∈ ax ↔ a ∈ ay, unique_al(ax), unique_al(ay) ⊦ # ax = # ay

System applied rule normalize

And obtained the following new goals

Proof step 2:
unique_al(ay), unique_al(ax), ∀ a. a ∈ ax ↔ a ∈ ay ⊦ # ax = # ay

Rule argument

Additional information