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Proof step 4 from proof subrec (previous step)

⊦ a ' + x ⊆m y ↔ a ∈ y ∧ (∀ a0. #oc(a0, x) ≤ #oc(a0, y -1l a))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
⊦ a ' + x ⊆m y ↔ a ∈ y ∧ (∀ a0. #oc(a0, x) ≤ #oc(a0, y -1l a))

Rule argument

Additional information