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Proof step 10 from proof sw (previous step)

b = a0, ∀ a, b. (x0 -l a) -l b = (x0 -l b) -l a ⊦ a = a0, (a0 ' + (x0 -l a)) -l b = ((a0 ' + x0) -l b) -l a

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 11:
∀ a, b. (x0 -l a) -l b = (x0 -l b) -l a ⊦ (x0 -l a) -l a0 = (x0 -l a0) -l a

Rule argument

Additional information

Used simplifier rules: del-y: ⊦ (a ' + x) -l a = x -l a;%a: ⊦ (x + y) + z = x + y + z; from specification list