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Proof step 10 from proof diff-wfrec (previous step)

∀ a, y. x0 \ (a ' + y) = (x0 -l a) \ y, a0 = a ∨ a0 ∈ y ⊦ x0 \ (a ' + y) = (a0 ' + (x0 -l a)) \ y, a = a0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 11:
a0 ∈ y, ∀ a, y. x0 \ (a ' + y) = (x0 -l a) \ y ⊦ x0 \ (a ' + y) = (x0 -l a) \ y, a = a0

Rule argument

Additional information

Used simplifier rules: diff-y: ⊦ a ∈ y → (a ' + x) \ y = x \ y;%a: ⊦ (x + y) + z = x + y + z; from specification list