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Proof step 12 from proof unsub-union-01 (previous step)

a1 ∈ s2, a ∈ s2, a ∈ s1, a2 ∈ s1, ∀ a. a ∈ s1 ∨ a ∈ s2 → a ∈ s ⊦ a ∈ s

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 5 terms: a

Additional information

Used terms: a