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Proof step 10 from proof perm-switch (previous step)

n < # y, m < # y, ∀ a. a ∈ x ∨ a ∈ y → #oc(a, x) = #oc(a, y), a ∈ x ∨ a ∈ y ⊦ y = [], #oc(a, x) = #oc(a, y)

User applied rule all left

And closed the goal!

Rule argument

pos: left 3 terms: a abort: F discard: T computed: T

Additional information

Used terms: a