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Proof step 4 from proof prefix-app-01 (previous step)

x0 + y ⊑ x0, ∀ y. x0 + y ⊑ x0 → y = [] ⊦ y = []

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 2 terms: y

Additional information

Used terms: y