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Proof step 4 from proof rmdup-last (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
∀ a. rmdup(x0 + a ') = rmdup(x0 -l a) + a ' ⊦ rmdup((a0 ' + x0) + a0 ') = rmdup(x0 -l a0) + a0 '

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