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Proof step 7 from proof del-rev (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 8:
∀ a. rev(x0) -l a = rev(x0 -l a) ⊦ rev(x0) -l a0 = rev(x0 -l a0)

Rule argument

Additional information

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