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Proof step 8 from proof del-rev (previous step)

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

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 1 terms: a0

Additional information

Used terms: a0