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Proof step 1 from proof ocs-del1 (conclusion)
⊦ 1 < #oc(a, x) → a ∈ x -1l a
System applied rule normalize
And obtained the following new goals
Proof step 2
:
1 < #oc(a, x) ⊦ a ∈ x -1l a
Rule argument
Additional information