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Proof step 10 from proof rmdup-del1-del (previous step)

∀ a. rmdup(x0) -1l a = rmdup(x0 -l a) ⊦ rmdup(a0 ' + x0) -1l a = rmdup((a0 ' + x0) -l a), a = a0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 11:
∀ a. rmdup(x0) -1l a = rmdup(x0 -l a) ⊦ rmdup(a0 ' + x0) -1l a = rmdup(a0 ' + (x0 -l a)), a = a0

Rule argument

Additional information

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