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Proof step 1 from proof rmdup-size (conclusion)

⊦ # rmdup(x ∪ y) = #(x ∪ y)

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: union: ⊦ x ∪ y = rmdup(x + y);%assoc: ⊦ (x ∪ y) ∪ z = x ∪ y ∪ z;% ⊦ rmdup(rmdup(x)) = rmdup(x); (s)