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Proof step 11 from proof size-perm (previous step)

# x = # y, #oc(a0, y) = 1, a0 ∈ y, ∀ a. a ∈ y → a ∈ x, ∀ a. a ∈ x → a ∈ y ⊦ dups(x), dups(y), a0 ∈ x

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 4 terms: a0

Additional information

Used terms: a0