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Proof step 1 from proof rm-in-04 (conclusion)

⊦ a ∈ y → rmdup(a ' + x + y) = rmdup(x + y)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
a ∈ y ⊦ rmdup(a ' + x + y) = rmdup(x + y)

Rule argument

Additional information