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Proof step 3 from proof del-rev (previous step)

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

Heuristic cut applied rule cut formula

And obtained the following new goals

Proof step 4:
a = a0, ∀ a. rev(x0) -l a = rev(x0 -l a) ⊦ (rev(x0) + a0 ') -l a = rev((a0 ' + x0) -l a)
Proof step 9:
∀ a. rev(x0) -l a = rev(x0 -l a) ⊦ a = a0, (rev(x0) + a0 ') -l a = rev((a0 ' + x0) -l a)

Rule argument

fma: a = a0

Additional information

Used formulas: a = a0