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Proof step 1 from proof k-Last-rec (conclusion)

⊦ (a + x) + b = a + (x + b)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: c: ⊦ a + x = a ' + x;%Last: ⊦ x + a = x + a ';%app-01: ⊦ x + y = x + z ↔ y = z;%a: ⊦ (x + y) + z = x + y + z;