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Proof step 12 from proof unique-add (previous step)

unique_al(ax0), ∀ a, d. a ∈ ax0 ∨ unique_al(ax0 + (a × d)') ⊦ a = a0, a ∈ ax0, a0 ∈ ax0, unique_al(ax0 + (a × d)')

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 2 terms: a, d

Additional information

Used terms: a, d