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Proof step 8 from proof perm-switch (previous step)

n < # y, m < # y, a ∈ x ∨ a ∈ y, ∀ a0. a0 ∈ x ∨ a0 ∈ y → #oc(a0, x) = #oc(a0, y) ⊦ #oc(a, x) = #oc(a, y), y = []

User applied rule all left

And closed the goal!

Rule argument

pos: left 4 terms: a abort: F discard: F computed: T

Additional information

Used terms: a