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Proof step 7 from proof append-to-gr (previous step)

∀ n0, y. n0 = 0 ∨ x0 + y to n0 + # x0 = x0 + (y to n0) ⊦ n0 = 0, x0 + y to n0 + # x0 = x0 + (y to n0)

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: n0, y

Additional information

Used terms: n0, y