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Proof step 1 from proof lenequal (conclusion)

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

System applied rule normalize

And obtained the following new goals

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

Rule argument

Additional information