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Proof step 2 from proof sort-max-last-01 (previous step)

⊦ sort(x + x0 + a ') = sort(x + x0) + a ', a < max(x + x0)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: sort-max-append-1: ⊦ ¬ a < max(x0) → sort(x0 + a ') = sort(x0) + a ';% ⊦ x + y = x + z ↔ y = z; (s)%a: ⊦ (x + y) + z = x + y + z; from specification list